WO2008001063A1 - Antibody molecules which bind human il-17 - Google Patents

Abstract

The invention relates to antibody molecules having specificity for antigenic determinants of IL-17, therapeutic uses of the antibody molecules and methods for producing said antibody molecules.

Description

Antibody molecules which bind human IL-17

The present invention relates to antibody molecules having specificity for antigenic determinants of IL-17. The present invention also relates to the therapeutic uses of the antibody molecules and methods for producing said antibody molecules.

Interleukin 17 (IL-17), also known as CTLA-8 or IL- 17A, is a pro-inflammatory cytokine which stimulates the secretion of a wide range of other cytokines from various nonimmune cells. IL-17 is capable of inducing the secretion of IL-6, IL-8, PGE2, MCP-I and G- CSF by adherent cells like fibroblasts, keratinocytes, epithelial and endothelial cells and is also able to induce ICAM-I surface expression, proliferation of T cells, and growth and differentiation of CD34+ human progenitors into neutrophils when cocultured in the presence of irradiated fibroblasts (Fossiez et al, 1998, Int.Rev.Immunol. 16, 541-551). IL-17 is predominantly produced by activated memory T cells and acts by binding to a ubiquitously distributed cell surface receptor (IL- 17R) (Yao et al, 1997, Cytokine, 9, 794-800). It may also act through binding to a complex of IL-17RA and IL-17RC (Toy et al, 2006, J. Immunol. 177(11);36-39). A number of homologues of IL-17 have been identified which have both similar and distinct roles in regulating inflammatory responses. For a review of IL-17 cytokine/receptor families see Dumont, 2003, Expert Opin. Ther. Patents, 13, 287-303. IL-17 may contribute to a number of diseases mediated by abnormal immune responses, such as rheumatoid arthritis and air-way inflammation, as well as organ transplant rejection and antitumour immunity. Inhibitors of IL-17 activity are well known in the art for example a murine IL-17R:human Fc fusion protein, a murine soluble IL-17R and an anti-IL- 17 monoclonal antibody have been used to demonstrate the role of IL-17 in various models of rheumatoid arthritis (Lubberts et al, J.Immunol. 2001,167, 1004-1013; Chabaud et al, Arthritis Res. 2001, 3, 168-177). In addition, neutralising polyclonal antibodies have been used to reduce peritoneal adhesion formation (Chung et al., 2002, J.Exp.Med., 195, 1471- 1478). Rat derived anti-human IL- 17 antibodies were described in WO04/106377. A humanised anti-IL-17 antibody with an affinity of around 22OpM was described in WO2006/054059. A monoclonal anti-IL-17 fully human antibody with an affinity of around 188pM was described in WO2006/013107.

There is still a need in the art for an improved anti-IL-17 antibody suitable for treating patients. We have now identified a high affinity neutralising anti-IL-17 antibody suitable for use in the treatment or prophylaxis of pathological disorders mediated by IL- 17 or associated with an increased level of IL-17.

The residues in antibody variable domains are conventionally numbered according to a system devised by Kabat et al. This system is set forth in Kabat et al., 1987, in Sequences of Proteins of Immunological Interest, US Department of Health and Human Services, NIH, USA (hereafter "Kabat et al. (supra)"). This numbering system is used in the present specification except where otherwise indicated.

The Kabat residue designations do not always correspond directly with the linear numbering of the amino acid residues. The actual linear amino acid sequence may contain fewer or additional amino acids than in the strict Kabat numbering corresponding to a shortening of, or insertion into, a structural component, whether framework or complementarity determining region (CDR), of the basic variable domain structure. The correct Kabat numbering of residues may be determined for a given antibody by alignment of residues of homology in the sequence of the antibody with a "standard" Kabat numbered sequence.

The CDRs of the heavy chain variable domain are located at residues 31-35 (CDR- Hl), residues 50-65 (CDR-H2) and residues 95-102 (CDR-H3) according to the Kabat numbering system. However, according to Chothia (Chothia, C. and Lesk, A.M. J. MoI. Biol., 196, 901-917 (1987)), the loop equivalent to CDR-Hl extends from residue 26 to residue 32. Thus 'CDR-Hl', as used herein, comprises residues 26 to 35, as described by a combination of the Kabat numbering system and Chothia' s topological loop definition.

The CDRs of the light chain variable domain are located at residues 24-34 (CDR-Ll), residues 50-56 (CDR-L2) and residues 89-97 (CDR-L3) according to the Kabat numbering system.

As used herein, the term 'neutralising antibody' describes an antibody that is capable of neutralising the biological signalling activity of IL- 17, for example by blocking binding of IL- 17 to one or more of its receptors.

Antibodies for use in the present invention may be obtained using any suitable method known in the art. The IL-17 polypeptide or cells expressing the polypeptide can be used to produce antibodies which specifically recognise IL-17. The IL- 17 polypeptide may be the 'mature' polypeptide or a biologically active fragment or derivatives thereof. Preferably the IL- 17 polypeptide is the mature human polypeptide. IL- 17 polypeptides may be prepared by processes well known in the art from genetically engineered host cells comprising expression systems or they may be recovered from natural biological sources. In the present application, the term "polypeptides" includes peptides, polypeptides and proteins. These are used interchangeably unless otherwise specified. The IL- 17 polypeptide may in some instances be part of a larger protein such as a fusion protein for example fused to an affinity tag. Antibodies generated against the IL- 17 polypeptide may be obtained, where immunisation of an animal is necessary, by administering the polypeptides to an animal, preferably a non- human animal, using well-known and routine protocols, see for example Handbook of

Experimental Immunology, D. M. Weir (ed.), VoI 4, Blackwell Scientific Publishers, Oxford, England, 1986). Many warm-blooded animals, such as rabbits, mice, rats, sheep, cows or pigs may be immunized. However, mice, rabbits, pigs and rats are generally preferred.

Antibodies for use in the present invention include whole antibodies and functionally active fragments or derivatives thereof and may be, but are not limited to, monoclonal, humanised, fully human or chimeric antibodies.

Monoclonal antibodies may be prepared by any method known in the art such as the hybridoma technique (Kohler & Milstein, 1975, Nature, 256:495-497), the trioma technique, the human B-cell hybridoma technique (Kozbor et al, 1983, Immunology Today, 4:72) and the EBV-hybridoma technique (Cole et al, Monoclonal Antibodies and Cancer Therapy, ρp77-96, Alan R Liss, Inc., 1985).

Antibodies for use in the invention may also be generated using single lymphocyte antibody methods by cloning and expressing immunoglobulin variable region cDNAs generated from single lymphocytes selected for the production of specific antibodies by for example the methods described by Babcook, J. et al, 1996, Proc. Natl. Acad. Sci. USA 93(15):7843-78481; WO92/02551; WO2004/051268 and International Patent Application number WO2004/106377.

Humanised antibodies (which include CDR-grafted antibodies) are antibody molecules having one or more complementarity determining regions (CDRs) from a non-human species and a framework region from a human immunoglobulin molecule (see, e.g. US 5,585,089; WO91/09967). It will be appreciated that it may only be necessary to transfer the specificity determining residues of the CDRs rather than the entire CDR (see for example, Kashmiri et al., 2005, Methods, 36, 25-34). Humanised antibodies may optionally further comprise one or more framework residues derived from the non-human species from which the CDRs were derived.

Chimeric antibodies are those antibodies encoded by immunoglobulin genes that have been genetically engineered so that the light and heavy chain genes are composed of immunoglobulin gene segments belonging to different species.

The antibodies for use in the present invention can also be generated using various phage display methods known in the art and include those disclosed by Brinkman et al. (in J. Immunol. Methods, 1995, 182: 41-50), Ames et al. (J. Immunol. Methods, 1995, 184:177- 186), Kettleborough et al. (Eur. J. Immunol. 1994, 24:952-958), Persic et al. (Gene, 1997 187 9-18), Burton et al. (Advances in Immunology, 1994, 57:191-280) and WO 90/02809; WO 91/10737; WO 92/01047; WO 92/18619; WO 93/11236; WO 95/15982; WO 95/20401; and US 5,698,426; 5,223,409; 5,403,484; 5,580,717; 5,427,908; 5,750,753; 5,821,047; 5,571,698; 5,427,908; 5,516,637; 5,780,225; 5,658,727; 5,733,743 and 5,969,108. Fully human antibodies are those antibodies in which the variable regions and the constant regions (where present) of both the heavy and the light chains are all of human origin, or substantially identical to sequences of human origin, not necessarily from the same antibody. Examples of fully human antibodies may include antibodies produced for example by the phage display methods described above and antibodies produced by mice in which the murine immunoglobulin variable and constant region genes have been replaced by their human counterparts eg. as described in general terms in EP0546073 Bl, US 5,545,806, US 5,569,825, US 5,625,126, US 5,633,425, US 5,661,016, US5,770,429, EP 0438474 Bl and EP0463151 Bl.

In one embodiment the present invention provides a neutralising antibody having specificity for human IL- 17, comprising a heavy chain, wherein the variable domain of the heavy chain comprises at least one of a CDR having the sequence given in Figure 1 (c) SEQ ID NO:1 for CDR-Hl, a CDR having the sequence given in Figure l(c) SEQ ID NO:2 for CDR-H2 and a CDR having the sequence given in Figure l(c) SEQ ID NO: 3 for CDR-H3.

In another embodiment the present invention provides a neutralising antibody having specificity for human IL- 17, comprising a heavy chain, wherein at least two of CDR-H 1 , CDR-H2 and CDR-H3 of the variable domain of the heavy chain are selected from the following: the sequence given in SEQ ID NO:1 for CDR-Hl, the sequence given in SEQ ID NO:2 for CDR-H2 and the sequence given in SEQ ID NO:3 for CDR-H3. For example, the antibody may comprise a heavy chain wherein CDR-Hl has the sequence given in SEQ ID NO:1 and CDR-H2 has the sequence given in SEQ ID NO:2. Alternatively, the antibody may comprise a heavy chain wherein CDR-Hl has the sequence given in SEQ ID NO:1 and CDR- H3 has the sequence given in SEQ ID NO:3, or the antibody may comprise a heavy chain wherein CDR-H2 has the sequence given in SEQ ID NO:2 and CDR-H3 has the sequence given in SEQ ID NO:3. For the avoidance of doubt, it is understood that all permutations are included. In another embodiment the present invention provides a neutralising antibody having specificity for human IL- 17, comprising a heavy chain, wherein the variable domain of the heavy chain comprises the sequence given in SEQ ID NO:1 for CDR-Hl, the sequence given in SEQ ID NO:2 for CDR-H2 and the sequence given in SEQ ID NO:3 for CDR-H3.

In one embodiment the present invention provides a neutralising antibody having specificity for human IL- 17, comprising a light chain, wherein the variable domain of the light chain comprises at least one of a CDR having the sequence given in Figure 1 (c) SEQ ID NO:4 for CDR-Ll, a CDR having the sequence given in Figure 1 (c) SEQ ID NO:5 for CDR- L2 and a CDR having the sequence given in Figure 1 (c) SEQ ID NO:6 for CDR-L3.

In another embodiment the present invention provides a neutralising antibody having specificity for human IL-17, comprising a light chain, wherein at least two of CDR-Ll, CDR- L2 and CDR- L3 of the variable domain of the light chain are selected from the following: the sequence given in SEQ ID NO:4 for CDR-Ll, the sequence given in SEQ ID NO:5 for CDR- L2 and the sequence given in SEQ ID NO:6 for CDR-L3. For example, the antibody may comprise a light chain wherein CDR-Ll has the sequence given in SEQ ID NO:4 and CDR- L2 has the sequence given in SEQ ID NO:5. Alternatively, the antibody may comprise a light chain wherein CDR-Ll has the sequence given in SEQ ID NO:4 and CDR-L3 has the sequence given in SEQ ID NO:6, or the antibody may comprise a light chain wherein CDR- L2 has the sequence given in SEQ ID NO:5 and CDR-L3 has the sequence given in SEQ ID NO:6. For the avoidance of doubt, it is understood that all permutations are included. In another embodiment the present invention provides a neutralising antibody having specificity for human IL-17, comprising a light chain, wherein the variable domain comprises the sequence given in SEQ ID NO:4 for CDR-Ll, the sequence given in SEQ ID NO:5 for CDR-L2 and the sequence given in SEQ ID NO:6 for CDR-L3.

The antibody molecules of the present invention preferably comprise a complementary light chain or a complementary heavy chain, respectively. Hence in one embodiment, an antibody according to the present invention comprises a heavy chain, wherein the variable domain of the heavy chain comprises the sequence given in SEQ ID NO:1 for CDR-Hl, the sequence given in SEQ ID NO:2 for CDR-H2 and the sequence given in SEQ ID NO:3 for CDR-H3 and a light chain wherein the variable domain of the light chain comprises the sequence given in SEQ ID NO:4 for CDR-Ll, the sequence given in SEQ ID NO:5 for CDR-L2 and the sequence given in SEQ ID NO:6 for CDR-L3.

It will be appreciated that one or more amino acid substitutions, additions and/or deletions may be made to the CDRs provided by the present invention without significantly altering the ability of the antibody to bind to IL- 17 and to neutralise IL- 17 activity. The effect of any amino acid substitutions, additions and/or deletions can be readily tested by one skilled in the art, for example by using the methods described in the Examples to determine IL- 17 binding and neutralisation. Accordingly, the present invention provides an antibody having specificity for human IL- 17 comprising one or more CDRs selected from CDRH-I (SEQ ID NO:1), CDRH-2 (SEQ ID NO.2), CDRH-3 (SEQ ID NO:3), CDRL-I (SEQ ID NO:4), CDRL-2 (SEQ ID NO:5) and CDRL-3 (SEQ ID NO:6) in which one or more amino acids in one or more of the CDRs has been substituted with another amino acid , preferably a similar amino acid as defined herein below. In one embodiment, the present invention provides an antibody having specificity for human IL-17 comprising CDRH-I (SEQ ID NO:1), CDRH-2 (SEQ ID NO:2), CDRH-3 (SEQ ID NO:3), CDRL-I (SEQ ID NO:4), CDRL-2 (SEQ ID NO:5) and CDRL-3 (SEQ ID NO:6) as shown in Figure l(c) in which one or more amino acids in one or more of the CDRs has been substituted with another amino acid , preferably a similar amino acid as defined herein below.

In one embodiment, an antibody of the present invention comprises a heavy chain, wherein the variable domain of the heavy chain comprises three CDRs wherein the sequence of CDRH-I has at least 60% identity or similarity to the sequence given in SEQ ID NO:1, CDRH-2 has at least 60% identity or similarity to the sequence given in SEQ ID NO:2 and/or CDRH-3 has at least 60% identity or similarity to the sequence given in SEQ ID NO:3. In another embodiment, an antibody of the present invention comprises a heavy chain, wherein the variable domain of the heavy chain comprises three CDRs wherein the sequence of CDRH-I has at least 70%, 80%, 90%, 95% or 98% identity or similarity to the sequence given in SEQ ID NO:1, CDRH-2 has at least 70%, 80%, 90%, 95% or 98% identity or similarity to the sequence given in SEQ ID NO:2 and/or CDRH-3 has at least 70%, 80%, 90%, 95% or 98% identity or similarity to the sequence given in SEQ ID NO:3.

"Identity", as used herein, indicates that at any particular position in the aligned sequences, the amino acid residue is identical between the sequences. "Similarity", as used herein, indicates that, at any particular position in the aligned sequences, the amino acid residue is of a similar type between the sequences. For example, leucine may be substituted for isoleucine or valine. Other amino acids which can often be substituted for one another include but are not limited to:

- phenylalanine, tyrosine and tryptophan (amino acids having aromatic side chains);

- lysine, arginine and histidine (amino acids having basic side chains); - aspartate and glutamate (amino acids having acidic side chains);

- asparagine and glutamine (amino acids having amide side chains); and

- cysteine and methionine (amino acids having sulphur-containing side chains). Degrees of identity and similarity can be readily calculated (Computational Molecular Biology, Lesk, A.M., ed., Oxford University Press, New York, 1988; Biocomputing. Informatics and Genome Projects, Smith, D. W., ed., Academic Press, New York, 1993; Computer Analysis of Sequence Data, Part 1, Griffin, A.M., and Griffin, H.G., eds., Humana Press, New Jersey, 1994; Sequence Analysis in Molecular Biology, von Heinje, G., Academic Press, 1987, Sequence Analysis Primer, Gribskov, M. and Devereux, J., eds., M Stockton Press, New York, 1991, the BLAST™ software available from NCBI (Altschul, S.F. et al, 1990, J. MoI. Biol. 215:403-410; Gish, W. & States, DJ. 1993, Nature Genet. 3:266-272. Madden, T.L. et al, 1996, Meth. Enzymol. 266:131-141; Altschul, S.F. et al, 1997, Nucleic Acids Res. 25:3389-3402; Zhang, J. & Madden, T.L. 1997, Genome Res. 7:649-656,).

In another embodiment, an antibody of the present invention comprises a light chain, wherein the variable domain of the light chain comprises three CDRs wherein the sequence of CDRL-I has at least 60% identity or similarity to the sequence given in SEQ ID NO:4,

CDRL-2 has at least 60% identity or similarity to the sequence given in SEQ ID NO:5 and/or CDRL-3 has at least 60% identity or similarity to the sequence given in SEQ ID NO:6. In another embodiment, an antibody of the present invention comprises a light chain, wherein the variable domain of the light chain comprises three CDRs wherein the sequence of CDRL- 1 has at least 70%, 80%, 90%, 95% or 98% identity or similarity to the sequence given in SEQ ID NO:4, CDRL-2 has at least 70%, 80%, 90%, 95% or 98% identity or similarity to the sequence given in SEQ ID NO:5 and/or CDRL-3 has at least 70%, 80%, 90%, 95% or 98% identity or similarity to the sequence given in SEQ ID NO:6.

In one embodiment the antibody provided by the present invention is a monoclonal antibody.

In one embodiment the antibody provided by the present invention is a chimeric antibody.

In one embodiment the antibody provided by the present invention is a CDR-grafted antibody molecule comprising one or more of the CDRs provided in SEQ ID NOS :1 to 6 (Figure 1 (c)) or variants thereof. As used herein, the term 'CDR-grafted antibody molecule' refers to an antibody molecule wherein the heavy and/or light chain contains one or more CDRs (including, if desired, one or more modified CDRs) from a donor antibody (e.g. a murine monoclonal antibody) grafted into a heavy and/or light chain variable region framework of an acceptor antibody (e.g. a human antibody). For a review, see Vaughan et al, Nature Biotechnology, 16, 535-539, 1998. In one embodiment rather than the entire CDR being transferred, only one or more of the specificity determining residues from any one of the CDRs described herein above are transferred to the human antibody framework (see for example, Kashmiri et ah, 2005, Methods, 36, 25-34). In one embodiment only the specificity determining residues from one or more of the CDRs described herein above are transferred to the human antibody framework. In another embodiment only the specificity determining residues from each of the CDRs described herein above are transferred to the human antibody framework.

When the CDRs or specificity determining residues are grafted, any appropriate acceptor variable region framework sequence may be used having regard to the class/type of the donor antibody from which the CDRs are derived, including mouse, primate and human framework regions. Preferably, the CDR-grafted antibody according to the present invention has a variable domain comprising human acceptor framework regions as well as one or more of the CDRs or specificity determining residues described above. Thus, provided in one embodiment is a neutralising CDR-grafted antibody wherein the variable domain comprises human acceptor framework regions and non-human donor CDRs.

Examples of human frameworks which can be used in the present invention are KOL, NEWM, REI, EU, TUR, TEI, LAY and POM (Kabat et al, supra). For example, KOL and NEWM can be used for the heavy chain, REI can be used for the light chain and EU, LAY and POM can be used for both the heavy chain and the light chain. Alternatively, human germline sequences may be used; these are available at: http://vbase.mrc-cpe.cam.ac.uk/ In a CDR-grafted antibody of the present invention, the acceptor heavy and light chains do not necessarily need to be derived from the same antibody and may, if desired, comprise composite chains having framework regions derived from different chains.

The preferred framework region for the heavy chain of the CDR-grafted antibody of the present invention is derived from the human sub-group VH3 sequence 1 -U 3-15 together with JH4. Accordingly, provided is a neutralising CDR-grafted antibody comprising at least one non-human donor CDR wherein the heavy chain framework region is derived from the human subgroup sequence 1 -U 3-15 together with JH4. The sequence of human JH4 is as follows: (YFDY)WGQGTLVTVSS. The YFDY motif is part of CDR-H3 and is not part of framework 4 (Ravetch, JV. et al, 1981, Cell, 27, 583-591).

The preferred framework region for the light chain of the CDR-grafted antibody of the present invention is derived from the human germline sub-group VKl sequence 2-1 -(1) L4 together with JKl . Accordingly, provided is a neutralising CDR-grafted antibody comprising at least one non-human donor CDR wherein the light chain framework region is derived from the human subgroup sequence VKl 2-l-(l) L4 together with JKl. The JKl sequence is as follows: (WT)FGQGTKVEIK. The WT motif is part of CDR-L3 and is not part of framework 4 (Hieter, PA., et al, 1982, J. Biol. Chem., 257, 1516-1522). Also, in a CDR-grafted antibody of the present invention, the framework regions need not have exactly the same sequence as those of the acceptor antibody. For instance, unusual residues may be changed to more frequently-occurring residues for that acceptor chain class or type. Alternatively, selected residues in the acceptor framework regions may be changed so that they correspond to the residue found at the same position in the donor antibody (see Reichmann et al, 1998, Nature, 332, 323-324). Such changes should be kept to the minimum necessary to recover the affinity of the donor antibody. A protocol for selecting residues in the acceptor framework regions which may need to be changed is set forth in WO 91/09967.

Preferably, in a CDR-grafted antibody molecule of the present invention, if the acceptor heavy chain has the human VH3 sequence 1 -U 3-15 together with JH4, then the acceptor framework regions of the heavy chain comprise, in addition to one or more donor CDRs, a donor residue at at least position 49 (according to Kabat et al.,(supra)). Accordingly, provided is a CDR-grafted antibody, wherein at least the residue at position 49 of the variable domain of the heavy chain is a donor residue.

Preferably, in a CDR-grafted antibody molecule according to the present invention, if the acceptor light chain has the human sub-group VKl sequence 2-l-(l) L4 together with JKl, then no donor residues are transferred i.e. only the CDRs are transferred. Accordingly, provided is a CDR-grafted antibody wherein only the CDRs are transferred to the donor framework.

Donor residues are residues from the donor antibody, i.e. the antibody from which the CDRs were originally derived.

In one embodiment, an antibody of the present invention comprises a heavy chain, wherein the variable domain of the heavy chain comprises the sequence given in Figure 1 (b) SEQ ID NO:9.

It will be appreciated that one or more amino acid substitutions, additions and/or deletions may be made to the antibody variable domains provided by the present invention without significantly altering the ability of the antibody to bind to IL- 17 and to neutralise IL- 17 activity. The effect of any amino acid substitutions, additions and/or deletions can be readily tested by one skilled in the art, for example by using the methods described in the Examples to determine IL- 17 binding and neutralisation. In another embodiment, an antibody of the present invention comprises a heavy chain, wherein the variable domain of the heavy chain comprises a sequence having at least 60% identity or similarity to the sequence given in SEQ ID NO:9. In one embodiment, an antibody of the present invention comprises a heavy chain, wherein the variable domain of the heavy chain comprises a sequence having at least 70%, 80%, 90%, 95% or 98% identity or similarity to the sequence given in SEQ ID NO:9. In one embodiment, an antibody of the present invention comprises a light chain, wherein the variable domain of the light chain comprises the sequence given in Figure 1 (a) SEQ ID NO:7.

In another embodiment, an antibody of the present invention comprises a light chain, wherein the variable domain of the light chain comprises a sequence having at least 60% identity or similarity to the sequence given in SEQ ID NO:7. In one embodiment the antibody of the present invention comprises a light chain, wherein the variable domain of the light chain comprises a sequence having at least 70%, 80%, 90%, 95% or 98% identity or similarity to the sequence given in SEQ ID NO:7. In one embodiment an antibody of the present invention comprises a heavy chain, wherein the variable domain of the heavy chain comprises the sequence given in SEQ ID NO: 9 and a light chain, wherein the variable domain of the light chain comprises the sequence given in SEQ ID NO:7.

In another embodiment of the invention, the antibody comprises a heavy chain and a light chain, wherein the variable domain of the heavy chain comprises a sequence having at least 60% identity or similarity to the sequence given in SEQ ID NO:9 and the variable domain of the light chain comprises a sequence having at least 60% identity or similarity to the sequence given in SEQ ID NO:7. Preferably, the antibody comprises a heavy chain, wherein the variable domain of the heavy chain comprises a sequence having at least 70%, 80%, 90%, 95% or 98% identity or similarity to the sequence given in SEQ ID NO:9 and a light chain, wherein the variable domain of the light chain comprises a sequence having at least 70%, 80%, 90%, 95% or 98% identity or similarity to the sequence given in SEQ ID NO:7.

The antibody molecules of the present invention may comprise a complete antibody molecule having full length heavy and light chains or a fragment thereof and may be, but are not limited to Fab, modified Fab, Fab', F(ab')₂, Fv, single domain antibodies, scFv, bi, tri or tetra-valent antibodies, Bis-scFv, diabodies, triabodies, tetrabodies and epitope-binding fragments of any of the above (see for example Holliger and Hudson, 2005, Nature Biotech. 23(9): 1126-1136; Adair and Lawson, 2005, Drug Design Reviews - Online 2(3), 209-217). The methods for creating and manufacturing these antibody fragments are well known in the art (see for example Verma et al., 1998, Journal of Immunological Methods, 216, 165-181). Other antibody fragments for use in the present invention include the Fab and Fab' fragments described in International patent applications WO2005/003169, WO2005/003170 and WO2005/003171. Multi-valent antibodies may comprise multiple specificities or may be monospecific (see for example WO 92/22853 and WO05/113605). The constant region domains of the antibody molecule of the present invention, if present, maybe selected having regard to the proposed function of the antibody molecule, and in particular the effector functions which may be required. For example, the constant region domains may be human IgA, IgD, IgE, IgG or IgM domains. In particular, human IgG constant region domains may be used, especially of the IgGl and IgG3 isotypes when the antibody molecule is intended for therapeutic uses and antibody effector functions are required. Alternatively, IgG2 and IgG4 isotypes may be used when the antibody molecule is intended for therapeutic purposes and antibody effector functions are not required, e.g. for simply blocking IL- 17 activity. It will be appreciated that sequence variants of these constant region domains may also be used . For example IgG4 molecules in which the serine at position 241 has been changed to proline as described in Angal et ah, Molecular

Immunology, 1993, 30 (1), 105-108 may be used. Particularly preferred is the IgG4 constant domain comprising this change. It will also be understood by one skilled in the art that antibodies may undergo a variety of posttranslational modifications. The type and extent of these modifications often depends on the host cell line used to express the antibody as well as the culture conditions. Such modifications may include variations in glycosylation, methionine oxidation, diketopiperazine formation, aspartate isomerization and asparagine deamidation. A frequent modification is the loss of a carboxy-terminal basic residue (such as lysine or arginine) due to the action of carboxypeptidases (as described in Harris, RJ. Journal of Chromatography 705:129-134, 1995). Accordingly, the C-terminal lysine of the antibody heavy chain given in Figure 1 (f), SEQ ID NO: 15 may be absent.

In one embodiment the antibody heavy chain comprises a CHl domain and the antibody light chain comprises a CL domain, either kappa or lambda.

In a preferred embodiment the antibody provided by the present invention is a neutralising antibody having specificity for human IL- 17 in which the heavy chain constant region comprises the human IgG4 constant region in which the serine at position 241 has been substituted by proline as described in Angal et ah, supra. Accordingly, the present invention provides an antibody in which the heavy chain comprises or consists of the sequence given in Figure l (f), SEQ ID NO: 15.

It will be appreciated that one or more amino acid substitutions, additions and/or deletions may be made to the antibody variable and/or constant domains provided by the present invention without significantly altering the ability of the antibody to bind to IL- 17 and to neutralise IL- 17 activity. The effect of any amino acid substitutions, additions and/or deletions can be readily tested by one skilled in the art, for example by using the methods described in the Examples to determine IL- 17 binding and neutralisation.

In one embodiment of the invention, the antibody comprises a heavy chain, wherein the heavy chain comprises a sequence having at least 60% identity or similarity to the sequence given in SEQ ID NO: 15. Preferably, the antibody comprises a heavy chain, wherein the heavy chain comprises a sequence having at least 70%, 80%, 90%, 95% or 98% identity or similarity to the sequence given in SEQ ID NO: 15.

In one embodiment an antibody molecule according to the present invention comprises a light chain comprising the sequence given in Figure 1 (d), SEQ ID NO:11.

In one embodiment of the invention, the antibody comprises a light chain, wherein the light chain comprises a sequence having at least 60% identity or similarity to the sequence given in SEQ ID NO:11. Preferably, the antibody comprises a light chain, wherein the light chain comprises a sequence having at least 70%, 80%, 90%, 95% or 98% identity or similarity to the sequence given in SEQ ID NO: 11.

In one embodiment the present invention provides an antibody in which the heavy chain comprises or consists of the sequence given in SEQ ID NO: 15 and the light chain comprises or consists of the sequence given in SEQ ID NO:11.

In one embodiment of the invention, the antibody comprises a heavy chain and a light chain, wherein the heavy chain comprises a sequence having at least 60% identity or similarity to the sequence given in SEQ ID NO: 15 and the light chain comprises a sequence having at least 60% identity or similarity to the sequence given in SEQ ID NO:11. Preferably, the antibody comprises a heavy chain, wherein the heavy chain comprises a sequence having at least 70%, 80%, 90%, 95% or 98% identity or similarity to the sequence given in SEQ ID NO: 15 and a light chain, wherein the light chain comprises a sequence having at least 70%, 80%, 90%, 95% or 98% identity or similarity to the sequence given in SEQ ID NO:11.

Also provided by the present invention is a specific region or epitope of human IL- 17 which is bound by an antibody provided by the present invention, in particular an antibody comprising the heavy chain sequence gH4 (SEQ ID NO: 9) and/or the light chain sequence gL2 (SEQ ID NO:7).

This specific region or epitope of the human IL- 17 polypeptide can be identified by any suitable epitope mapping method known in the art in combination with any one of the antibodies provided by the present invention. Examples of such methods include screening peptides of varying lengths derived from IL- 17 for binding to the antibody of the present invention with the smallest fragment that can specifically bind to the antibody containing the sequence of the epitope recognised by the antibody. The IL- 17 peptides may be produced synthetically or by proteolytic digestion of the IL- 17 polypeptide. Peptides that bind the antibody can be identified by, for example, mass spectrometric analysis. In another example, NMR spectroscopy can be used to identify the epitope bound by an antibody of the present invention. Once identified, the epitopic fragment which binds an antibody of the present invention can be used, if required, as an immunogen to obtain additional neutralising antibodies which bind the same epitope.

Antibodies which cross-block the binding of an antibody according to the present invention in particular, an antibody comprising the heavy chain sequence gH4 (SEQ ID NO:9) and the light chain sequence gL2 (SEQ ID NO:7) may be similarly useful in neutralising IL-17 activity. Accordingly, the present invention also provides a neutralising antibody having specificity for human IL-17, which cross-blocks the binding of any one of the antibodies described above to human IL-17 and/or is cross-blocked from binding IL-17 by any one of those antibodies. In one embodiment, such an antibody binds to the same epitope as an antibody described herein above. In another embodiment the cross-blocking neutralising antibody binds to an epitope which borders and/or overlaps with the epitope bound by an antibody described herein above. In another embodiment the cross-blocking neutralising antibody of this aspect of the invention does not bind to the same epitope as an antibody of the present invention or an epitope that borders and/or overlaps with said epitope. Cross-blocking antibodies can be identified using any suitable method in the art, for example by using competition ELISA or BIAcore where binding of the cross blocking antibody to human IL-17 prevents the binding of an antibody of the present invention or vice versa.

In one embodiment there is provided a neutralising antibody having specificity for human IL- 17, which cross-blocks the binding of an antibody whose heavy chain comprises the sequence gH4 (SEQ ID NO:9) and whose light chain comprises the sequence gL2 (SEQ ID NO:7) to human IL- 17. In one embodiment the cross-blocking antibodies provided by the present invention inhibit the binding of an antibody comprising the heavy chain sequence gH4 (SEQ ID NO:9) and the light chain sequence gL2 (SEQ ID NO:7) by greater than 80%, preferably by greater than 85%, more preferably by greater than 90%, even more preferably by greater than 95%.

Alternatively or in addition, neutralising antibodies according to this aspect of the invention may be cross-blocked from binding to human IL- 17 by an antibody comprising the heavy chain sequence gH4 (SEQ ID NO:9) and the light chain sequence gL2 (SEQ ID NO:7). Also provided therefore is a neutralising antibody molecule having specificity for human IL- 17 which is cross-blocked from binding human IL- 17 by an antibody comprising the heavy chain sequence gH4 (SEQ ID NO:9) and the light chain sequence gL2 (SEQ ID NO:7). In one embodiment the neutralising antibodies provided by this aspect of the invention are inhibited from binding human IL- 17 by an antibody comprising the heavy chain sequence gH4 (SEQ ID NO:9) and the light chain sequence gL2 (SEQ ID NO:7) by greater than 80%, preferably by greater than 85%, more preferably by greater than 90%, even more preferably by greater than 95%.

In one embodiment the cross-blocking antibodies provided by the present invention are fully human. In one embodiment the cross-blocking antibodies provided by the present invention are humanised. In one embodiment the cross-blocking antibodies provided by the present invention have an affinity for human IL- 17 of 10OpM or better.

The antibody molecules of the present invention preferably have a high binding affinity, preferably picomolar. Affinity may be measured using any suitable method known in the art, including BIAcore as described in the Examples herein using natural or recombinant IL- 17. Preferably affinity is measured using recombinant human IL- 17 as described in the examples herein. Preferably the antibody molecules of the present invention have a binding affinity of about 20OpM or better. In one embodiment the antibody molecule of the present invention has a binding affinity of about 100 pM or better. In one embodiment the antibody molecule of the present invention has a binding affinity of about 5OpM or better. In one embodiment the antibody molecule of the present invention has a binding affinity of about 2OpM or better. In one embodiment the antibody molecule of the present invention has a binding affinity of about 1 OpM or better. In one embodiment the antibody molecule of the present invention is fully human or humanised and has a binding affinity of about lOOpM or better. It will be appreciated that the affinity of antibodies provided by the present invention may be altered using any suitable method known in the art. The present invention therefore also relates to variants of the antibody molecules of the present invention, which have an improved affinity for IL- 17. Such variants can be obtained by a number of affinity maturation protocols including mutating the CDRs (Yang et al, J. MoI. Biol., 254, 392-403, 1995), chain shuffling (Marks et al, Bio/Technology, K), 779-783, 1992), use of mutator strains of E. coli (Low et al, J. MoI. Biol., 250, 359-368, 1996), DNA shuffling (Patten et al, Curr. Opin. BiotechnoL, 8, 724-733, 1997), phage display (Thompson et al, J. MoI. Biol., 256, 77-88, 1996) and sexual PCR (Crameri et al, Nature, 391, 288-291 , 1998). Vaughan et al. {supra) discusses these methods of affinity maturation.

In one embodiment the antibody molecules of the present invention neutralise IL- 17 activity, for example in the in vitro assays described in the Examples. In one embodiment the present invention provides a neutralising antibody having specificity for human IL- 17 which is capable of inhibiting the activity of 0.8nM human IL- 17 by 50% at a concentration of less than 2nM said inhibitory activity being measured on the IL- 17 induced release of IL-6 from HeIa cells. In one embodiment the concentration of antibody which inhibits IL- 17 by 50% is less than InM. In one embodiment, less than 0.5nM. In one embodiment the human IL-17 used in the assay is natural human IL-17. In one embodiment the human IL- 17 used in the assay is recombinant human IL-17. In one embodiment the neutralising antibody is a humanised or fully human antibody.

If desired an antibody for use in the present invention maybe conjugated to one or more effector molecule(s). It will be appreciated that the effector molecule may comprise a single effector molecule or two or more such molecules so linked as to form a single moiety that can be attached to the antibodies of the present invention. Where it is desired to obtain an antibody fragment linked to an effector molecule, this may be prepared by standard chemical or recombinant DNA procedures in which the antibody fragment is linked either directly or via a coupling agent to the effector molecule. Techniques for conjugating such effector molecules to antibodies are well known in the art (see, Hellstrom et ah, Controlled Drug Delivery, 2nd Ed., Robinson et ah, eds., 1987, pp. 623-53; Thorpe et ah, 1982 , Immunol. Rev., 62:119-58 and Dubowchik et ah, 1999, Pharmacology and Therapeutics, 83, 67-123). Particular chemical procedures include, for example, those described in WO 93/06231 , WO 92/22583, WO 89/00195, WO 89/01476 and WO03031581. Alternatively, where the effector molecule is a protein or polypeptide the linkage may be achieved using recombinant DNA procedures, for example as described in WO 86/01533 and EP0392745.

The term effector molecule as used herein includes, for example, antineoplastic agents, drugs, toxins, biologically active proteins, for example enzymes, other antibody or antibody fragments, synthetic or naturally occurring polymers, nucleic acids and fragments thereof e.g. DNA, RNA and fragments thereof, radionuclides, particularly radioiodide, radioisotopes, chelated metals, nanoparticles and reporter groups such as fluorescent compounds or compounds which may be detected by NMR or ESR spectroscopy. Examples of effector molecules may include cytotoxins or cytotoxic agents including any agent that is detrimental to (e.g. kills) cells. Examples include combrestatins, dolastatins, epothilones, staurosporin, maytansinoids, spongistatins, rhizoxin, halichondrins, roridins, hemiasterlins, taxol, cytochalasin B, gramicidin D, ethidium bromide, emetine, mitomycin, etoposide, tenoposide, vincristine, vinblastine, colchicin, doxorubicin, daunorubicin, dihydroxy anthracin dione, mitoxantrone, mithramycin, actinomycin D, 1- dehydrotestosterone, glucocorticoids, procaine, tetracaine, lidocaine, propranolol, and puromycin and analogs or homologs thereof.

Effector molecules also include, but are not limited to, antimetabolites (e.g. methotrexate, 6-mercaptopurine, 6-thioguanine, cytarabine, 5-fluorouracil decarbazine), alkylating agents (e.g. mechlorethamine, thioepa chlorambucil, melphalan, carmustine (BSNU) and lomustine (CCNU), cyclophosphamide, busulfan, dibromomannitol, streptozotocin, mitomycin C, and cis-dichlorodiamine platinum (II) (DDP) cisplatin), anthracyclines (e.g. daunorubicin (formerly daunomycin) and doxorubicin), antibiotics (e.g. dactinomycin (formerly actinomycin), bleomycin, mithramycin, anthramycin (AMC), calicheamicins or duocarmycins), and anti-mitotic agents (e.g. vincristine and vinblastine). Other effector molecules may include chelated radionuclides such as ¹¹¹In and ⁹⁰Y, Lu¹⁷⁷, Bismuth²¹³, Californium²⁵², Iridium¹⁹² and Tungsten¹⁸⁸/Rhenium¹⁸⁸; or drags such as but not limited to, alkylphosphocholines, topoisomerase I inhibitors, taxoids and suramin.

Other effector molecules include proteins, peptides and enzymes. Enzymes of interest include, but are not limited to, proteolytic enzymes, hydrolases, lyases, isomerases, transferases. Proteins, polypeptides and peptides of interest include, but are not limited to, immunoglobulins, toxins such as abrin, ricin A, pseudomonas exotoxin, or diphtheria toxin, a protein such as insulin, tumour necrosis factor, α-interferon, β-interferon, nerve growth factor, platelet derived growth factor or tissue plasminogen activator, a thrombotic agent or an anti-angiogenic agent, e.g. angiostatin or endostatin, or, a biological response modifier such as a lymphokine, interleukin-1 (IL-I), interleukin-2 (IL-2), granulocyte macrophage colony stimulating factor (GM-CSF), granulocyte colony stimulating factor (G-CSF), nerve growth factor (NGF) or other growth factor and immunoglobulins.

Other effector molecules may include detectable substances useful for example in diagnosis. Examples of detectable substances include various enzymes, prosthetic groups, fluorescent materials, luminescent materials, bioluminescent materials, radioactive nuclides, positron emitting metals (for use in positron emission tomography), and nonradioactive paramagnetic metal ions. See generally U.S. Patent No. 4,741,900 for metal ions which can be conjugated to antibodies for use as diagnostics. Suitable enzymes include horseradish peroxidase, alkaline phosphatase, beta-galactosidase, or acetylcholinesterase; suitable prosthetic groups include streptavidin, avidin and biotin; suitable fluorescent materials include umbelliferone, fluorescein, fluorescein isothiocyanate, rhodamine, dichlorotriazinylamine fluorescein, dansyl chloride and phycoerythrin; suitable luminescent materials include luminol; suitable bioluminescent materials include luciferase, luciferin, and aequorin; and suitable radioactive nuclides include ¹²⁵1, ¹³¹I, ¹¹¹Li and ⁹⁹Tc.

In another example the effector molecule may increase the half-life of the antibody in vivo, and/or reduce immunogenicity of the antibody and/or enhance the delivery of an antibody across an epithelial barrier to the immune system. Examples of suitable effector molecules of this type include polymers, albumin, albumin binding proteins or albumin binding compounds such as those described in WO05/117984.

Where the effector molecule is a polymer it may, in general, be a synthetic or a naturally occurring polymer, for example an optionally substituted straight or branched chain polyalkylene, polyalkenylene or polyoxyalkylene polymer or a branched or unbranched polysaccharide, e.g. a homo- or hetero- polysaccharide.

Particular optional substituents which may be present on the above-mentioned synthetic polymers include one or more hydroxy, methyl or methoxy groups. Particular examples of synthetic polymers include optionally substituted straight or branched chain poly(ethyleneglycol), poly(propyleneglycol) poly(vinylalcohol) or derivatives thereof, especially optionally substituted poly(ethyleneglycol) such as methoxypoly(ethyleneglycol) or derivatives thereof.

Particular naturally occurring polymers include lactose, amylose, dextran, glycogen or derivatives thereof.

"Derivatives" as used herein is intended to include reactive derivatives, for example thiol-selective reactive groups such as maleimides and the like. The reactive group may be linked directly or through a linker segment to the polymer. It will be appreciated that the residue of such a group will in some instances form part of the product as the linking group between the antibody fragment and the polymer.

The size of the polymer maybe varied as desired, but will generally be in an average molecular weight range from 500Da to 50000Da, preferably from 5000 to 40000Da and more preferably from 20000 to 40000Da. The polymer size may in particular be selected on the basis of the intended use of the product for example ability to localize to certain tissues such as tumors or extend circulating half-life (for review see Chapman, 2002, Advanced Drug Delivery Reviews, 54, 531-545). Thus, for example, where the product is intended to leave the circulation and penetrate tissue, for example for use in the treatment of a tumour, it may be advantageous to use a small molecular weight polymer, for example with a molecular weight of around 5000Da. For applications where the product remains in the circulation, it may be advantageous to use a higher molecular weight polymer, for example having a molecular weight in the range from 20000Da to 40000Da.

Particularly preferred polymers include a polyalkylene polymer, such as a ρoly(ethyleneglycol) or, especially, a methoxypoly(ethyleneglycoi) or a derivative thereof, and especially with a molecular weight in the range from about 15000Da to about 40000Da. In one example antibodies for use in the present invention are attached to poly(ethyleneglycol) (PEG) moieties. In one particular example the antibody is an antibody fragment and the PEG molecules may be attached through any available amino acid side- chain or terminal amino acid functional group located in the antibody fragment, for example any free amino, imino, thiol, hydroxyl or carboxyl group. Such amino acids may occur naturally in the antibody fragment or may be engineered into the fragment using recombinant DNA methods (see for example US 5,219,996; US 5,667,425; WO98/25971). In one example the antibody molecule of the present invention is a modified Fab fragment wherein the modification is the addition to the C-terminal end of its heavy chain one or more amino acids to allow the attachment of an effector molecule. Preferably, the additional amino acids form a modified hinge region containing one or more cysteine residues to which the effector molecule may be attached. Multiple sites can be used to attach two or more PEG molecules.

Preferably PEG molecules are covalently linked through a thiol group of at least one cysteine residue located in the antibody fragment. Each polymer molecule attached to the modified antibody fragment may be covalently linked to the sulphur atom of a cysteine residue located in the fragment. The covalent linkage will generally be a disulphide bond or, in particular, a sulphur-carbon bond. Where a thiol group is used as the point of attachment appropriately activated effector molecules, for example thiol selective derivatives such as maleimides and cysteine derivatives may be used. An activated polymer may be used as the starting material in the preparation of polymer-modified antibody fragments as described above. The activated polymer may be any polymer containing a thiol reactive group such as an α-halocarboxylic acid or ester, e.g. iodoacetamide, an imide, e.g. maleimide, a vinyl sulphone or a disulphide. Such starting materials may be obtained commercially (for example from Nektar, formerly Shearwater Polymers Inc., Huntsville, AL, USA) or maybe prepared from commercially available starting materials using conventional chemical procedures. Particular PEG molecules include 2OK methoxy-PEG-amine (obtainable from Nektar, formerly Shearwater; Rapp Polymere; and SunBio) and M-PEG-SPA (obtainable from Nektar, formerly Shearwater).

In one embodiment, the antibody is a modified Fab fragment or diFab which is PEGylated, i.e. has PEG (poly(ethyleneglycol)) covalently attached thereto, e.g. according to the method disclosed in EP 0948544 or EP 1090037 [see also "Poly(ethyleneglycol) Chemistry, Biotechnical and Biomedical Applications", 1992, J. Milton Harris (ed), Plenum Press, New York, "Poly(ethyleneglycol) Chemistry and Biological Applications", 1997, J. Milton Harris and S. Zalipsky (eds), American Chemical Society, Washington DC and "Bioconjugation Protein Coupling Techniques for the Biomedical Sciences", 1998, M. Aslam and A. Dent, Grove Publishers, New York; Chapman, A. 2002, Advanced Drug Delivery Reviews 2002, 54:531-545]. In one example PEG is attached to a cysteine in the hinge region. In one example, a PEG modified Fab fragment has a maleimide group covalently linked to a single thiol group in a modified hinge region. A lysine residue may be covalently linked to the maleimide group and to each of the amine groups on the lysine residue may be attached a methoxypoly(ethyleneglycol) polymer having a molecular weight of approximately 20,000 Da. The total molecular weight of the PEG attached to the Fab fragment may therefore be approximately 40,000 Da.

In one embodiment, the present invention provides a neutralising antibody molecule having specificity for human IL-17, which is a modified Fab fragment having a heavy chain comprising the sequence given in SEQ ID NO:9 and a light chain comprising the sequence given in SEQ ID NO.7 and having at the C-terminal end of its heavy chain a modified hinge region containing at least one cysteine residue to which an effector molecule is attached. Preferably the effector molecule is PEG and is attached using the methods described in (WO98/25971 and WO2004072116) whereby a lysyl-maleimide group is attached to the cysteine residue at the C-terminal end of the heavy chain, and each amino group of the lysyl residue has covalently linked to it a methoxypoly(ethyleneglycol) residue having a molecular weight of about 20,000 Da. The total molecular weight of the PEG attached to the antibody is therefore approximately 40,000Da.

In another example effector molecules may be attached to antibody fragments using the methods described in International patent applications WO2005/003169, WO2005/003170 and WO2005/003171.

The present invention also provides an isolated DNA sequence encoding the heavy and/or light chain(s) of an antibody molecule of the present invention. Preferably, the DNA sequence encodes the heavy or the light chain of an antibody molecule of the present invention. The DNA sequence of the present invention may comprise synthetic DNA, for instance produced by chemical processing, cDNA, genomic DNA or any combination thereof. DNA sequences which encode an antibody molecule of the present invention can be obtained by methods well known to those skilled in the art. For example, DNA sequences coding for part or all of the antibody heavy and light chains may be synthesised as desired from the determined DNA sequences or on the basis of the corresponding amino acid sequences.

DNA coding for acceptor framework sequences is widely available to those skilled in the art and can be readily synthesised on the basis of their known amino acid sequences.

Standard techniques of molecular biology may be used to prepare DNA sequences coding for the antibody molecule of the present invention. Desired DNA sequences may be synthesised completely or in part using oligonucleotide synthesis techniques. Site-directed mutagenesis and polymerase chain reaction (PCR) techniques may be used as appropriate.

Examples of suitable sequences are provided in Figure 1 (h) SEQ ID NO:8; Figure 1 (i) SEQ ID NO: 10; Figure 1 (j) SEQ ID NO:13; Figure 1 (k) SEQ ID NO: 14; Figure 1 (1) SEQ ID NO:17 and Figure 1 (m) SEQ ID NO:18. Nucleotides 1-57 in SEQ ID NO 18 and 1- 60 in SEQ ID NO 14 encode the signal peptide sequence from mouse antibody B72.3 (Whittle et ah, 1987, Protein Eng. 1(6) 499-505.) which is cleaved to give a neutralising antibody molecule of the present invention (the signal peptide corresponds to amino acid residues 1-19 in Figure 1 (g) SEQ ID NO: 16 and 1-20 in Figure 1 (e) SEQ ID NO: 12 respectively). The present invention also provides an isolated DNA sequence encoding the heavy chain of an antibody of the present invention which comprises SEQ ID NO : 17 or SEQ ID NO : 18. The present invention also provides an isolated DNA sequence encoding the light chain of an antibody of the present invention which comprises SEQ ID NO:13 or SEQ ID NO:14.

The present invention also relates to a cloning or expression vector comprising one or more DNA sequences of the present invention. Accordingly, provided is a cloning or expression vector comprising one or more DNA sequences encoding an antibody of the present invention. Preferably, the cloning or expression vector comprises two DNA sequences, encoding the light chain and the heavy chain of the antibody molecule of the present invention, respectively. Preferably, a vector according to the present invention comprises the sequences given in SEQ ID NO:14 and SEQ ID NO:18. Nucleotides 1-57 in SEQ ID NO 18 and 1-60 in SEQ ID NO 14 encode the signal peptide sequence from mouse antibody B72.3 (residues 1-19 in SEQ ID NO: 16 and 1-20 in SEQ ID NO:12 respectively) which is most preferably cleaved to give a neutralising antibody molecule of the present invention.

General methods by which the vectors may be constructed, transfection methods and culture methods are well known to those skilled in the art. In this respect, reference is made to "Current Protocols in Molecular Biology", 1999, F. M. Ausubel (ed), Wiley Interscience, New York and the Maniatis Manual produced by Cold Spring Harbor Publishing.

Also provided is a host cell comprising one or more cloning or expression vectors comprising one or more DNA sequences encoding an antibody of the present invention. Any suitable host cell/vector system may be used for expression of the DNA sequences encoding the antibody molecule of the present invention. Bacterial, for example E. coli, and other microbial systems may be used or eukaryotic, for example mammalian, host cell expression systems may also be used. Suitable mammalian host cells include CHO, myeloma or hybridoma cells.

The present invention also provides a process for the production of an antibody molecule according to the present invention comprising culruring a host cell containing a vector of the present invention under conditions suitable for leading to expression of protein from DNA encoding the antibody molecule of the present invention, and isolating the antibody molecule.

The antibody molecule may comprise only a heavy or light chain polypeptide, in which case only a heavy chain or light chain polypeptide coding sequence needs to be used to transfect the host cells. For production of products comprising both heavy and light chains, the cell line may be transfected with two vectors, a first vector encoding a light chain polypeptide and a second vector encoding a heavy chain polypeptide. Alternatively, a single vector may be used, the vector including sequences encoding light chain and heavy chain polypeptides.

As the antibodies of the present invention are useful in the treatment and/or prophylaxis of a pathological condition, the present invention also provides a pharmaceutical or diagnostic composition comprising an antibody molecule of the present invention in combination with one or more of a pharmaceutically acceptable excipient, diluent or carrier. Accordingly, provided is the use of an antibody of the invention for the manufacture of a medicament. The composition will usually be supplied as part of a sterile, pharmaceutical composition that will normally include a pharmaceutically acceptable carrier. A pharmaceutical composition of the present invention may additionally comprise a pharmaceutically- acceptable adjuvant.

The present invention also provides a process for preparation of a pharmaceutical or diagnostic composition comprising adding and mixing the antibody molecule of the present invention together with one or more of a pharmaceutically acceptable excipient, diluent or carrier.

The antibody molecule may be the sole active ingredient in the pharmaceutical or diagnostic composition or may be accompanied by other active ingredients including other antibody ingredients, for example anti-TNF, anti- IL- lβ, anti-T cell, anti-IFNγ or anti-LPS antibodies, or non-antibody ingredients such as xanthines. Other suitable active ingredients include antibodies capable of inducing tolerance, for example, anti-CD3 or anti-CD4 antibodies.

The pharmaceutical compositions preferably comprise a therapeutically effective amount of the antibody of the invention. The term "therapeutically effective amount" as used herein refers to an amount of a therapeutic agent needed to treat, ameliorate or prevent a targeted disease or condition, or to exhibit a detectable therapeutic or preventative effect. For any antibody, the therapeutically effective amount can be estimated initially either in cell culture assays or in animal models, usually in rodents, rabbits, dogs, pigs or primates. The animal model may also be used to determine the appropriate concentration range and route of administration. Such information can then be used to determine useful doses and routes for administration in humans.

The precise therapeutically effective amount for a human subject will depend upon the severity of the disease state, the general health of the subject, the age, weight and gender of the subject, diet, time and frequency of administration, drug combination(s), reaction sensitivities and tolerance/response to therapy. This amount can be determined by routine experimentation and is within the judgement of the clinician. Generally, a therapeutically effective amount will be from 0.01 mg/kg to 50 mg/kg, preferably 0.1 mg/kg to 20 mg/kg. Pharmaceutical compositions maybe conveniently presented in unit dose forms containing a predetermined amount of an active agent of the invention per dose. Compositions may be administered individually to a patient or may be administered in combination (e.g. simultaneously, sequentially or separately) with other agents, drugs or hormones.

The dose at which the antibody molecule of the present invention is administered depends on the nature of the condition to be treated, the extent of the inflammation present and on whether the antibody molecule is being used prophylactically or to treat an existing condition.

The frequency of dose will depend on the half-life of the antibody molecule and the duration of its effect. If the antibody molecule has a short half-life (e.g. 2 to 10 hours) it may be necessary to give one or more doses per day. Alternatively, if the antibody molecule has a long half life (e.g. 2 to 15 days) it may only be necessary to give a dosage once per day, once per week or even once every 1 or 2 months.

The pharmaceutically acceptable carrier should not itself induce the production of antibodies harmful to the individual receiving the composition and should not be toxic. Suitable carriers may be large, slowly metabolised macromolecules such as proteins, polypeptides, liposomes, polysaccharides, polylactic acids, polyglycolic acids, polymeric amino acids, amino acid copolymers and inactive virus particles.

Pharmaceutically acceptable salts can be used, for example mineral acid salts, such as hydrochlorides, hydrobromides, phosphates and sulphates, or salts of organic acids, such as acetates, propionates, malonates and benzoates.

Pharmaceutically acceptable carriers in therapeutic compositions may additionally contain liquids such as water, saline, glycerol and ethanol. Additionally, auxiliary substances, such as wetting or emulsifying agents or pH buffering substances, may be present in such compositions. Such carriers enable the pharmaceutical compositions to be formulated as tablets, pills, dragees, capsules, liquids, gels, syrups, slurries and suspensions, for ingestion by the patient.

Preferred forms for administration include forms suitable for parenteral administration, e.g. by injection or infusion, for example by bolus injection or continuous infusion. Where the product is for injection or infusion, it may take the form of a suspension, solution or emulsion in an oily or aqueous vehicle and it may contain formulatory agents, such as suspending, preservative, stabilising and/or dispersing agents. Alternatively, the antibody molecule may be in dry form, for reconstitution before use with an appropriate sterile liquid.

Once formulated, the compositions of the invention can be administered directly to the subject. The subjects to be treated can be animals. However, it is preferred that the compositions are adapted for administration to human subjects.

The pharmaceutical compositions of this invention may be administered by any number of routes including, but not limited to, oral, intravenous, intramuscular, intra-arterial, intramedullary, intrathecal, intraventricular, transdermal, transcutaneous (for example, see WO 98/20734), subcutaneous, intraperitoneal, intranasal, enteral, topical, sublingual, intravaginal or rectal routes. Hyposprays may also be used to administer the pharmaceutical compositions of the invention. Typically, the therapeutic compositions may be prepared as injectables, either as liquid solutions or suspensions. Solid forms suitable for solution in, or suspension in, liquid vehicles prior to injection may also be prepared.

Direct delivery of the compositions will generally be accomplished by injection, subcutaneously, intraperitoneally, intravenously or intramuscularly, or delivered to the interstitial space of a tissue. The compositions can also be administered into a lesion. Dosage treatment may be a single dose schedule or a multiple dose schedule.

It will be appreciated that the active ingredient in the composition will be an antibody molecule. As such, it will be susceptible to degradation in the gastrointestinal tract. Thus, if the composition is to be administered by a route using the gastrointestinal tract, the composition will need to contain agents which protect the antibody from degradation but which release the antibody once it has been absorbed from the gastrointestinal tract.

A thorough discussion of pharmaceutically acceptable carriers is available in Remington's Pharmaceutical Sciences (Mack Publishing Company, NJ. 1991). It is also envisaged that the antibody of the present invention will be administered by use of gene therapy. In order to achieve this, DNA sequences encoding the heavy and light chains of the antibody molecule under the control of appropriate DNA components are introduced into a patient such that the antibody chains are expressed from the DNA sequences and assembled in situ. The present invention also provides an antibody molecule for use in the control of inflammatory dieseases. Preferaby, the antibody molecule can be used to reduce the inflammatory process or to prevent the inflammatory process.

The present invention also provides the antibody molecule of the present invention for use in the treatment or prophylaxis of a pathological disorder that is mediated by IL- 17 or associated with an increased level of IL-17. Preferably, the pathological condition is selected from the group consisting of infections (viral, bacterial, fungal and parasitic), endotoxic shock associtated with infection, arthritis, rheumatoid arthritis, asthma, pelvic inflammatory disease, Alzheimer's Disease, Crohn's disease, Peyronie's Disease, coeliac disease, gallbladder disease, Pilonidal disease, peritonitis, psoriasis, vasculitis, surgical adhesions, stroke, Type I Diabetes, lyme arthritis, meningoencephalitis, immune mediated inflammatory disorders of the central and peripheral nervous system such as multiple sclerosis and Guillain-Barr syndrome, other autoimmune disorders, pancreatitis, trauma (surgery), graft-versus-host disease, transplant rejection, cancer (both solid tumours such as melanomas, hepatoblastomas, sarcomas, squamous cell carcinomas, transitional cell cancers, ovarian cancers and hematologic malignancies and in particular acute myelogenous leukaemia, chronic myelogenous leukemia, gastric cancer and colon cancer), heart disease including ischaemic diseases such as myocardial infarction as well as atherosclerosis, intravascular coagulation, bone resorption, osteoporosis, osteoarthritis, periodontitis and hypochlorhydia. The present invention also provides an antibody molecule according to the present invention for use in the treatment or prophylaxis of pain.

The present invention further provides the use of an antibody molecule according to the present invention in the manufacture of a medicament for the treatment or prophylaxis of a pathological disorder that is mediated by IL- 17 or associated with an increased level of IL- 17. Preferably the pathological disorder is rheumatoid arthritis or multiple sclerosis.

The present invention further provides the use of an antibody molecule according to the present invention in the manufacture of a medicament for the treatment or prophylaxis of pain.

An antibody molecule of the present invention may be utilised in any therapy where it is desired to reduce the effects of IL- 17 in the human or animal body. IL- 17 may be circulating in the body or may be present in an undesirably high level localised at a particular site in the body, for example a site of inflammation.

The antibody molecule of the present invention is preferably used for the control of inflammatory disease. The present invention also provides a method of treating human or animal subjects suffering from or at risk of a disorder mediated by IL- 17, the method comprising administering to the subject an effective amount of the antibody molecule of the present invention.

The antibody molecule of the present invention may also be used in diagnosis, for example in the in vivo diagnosis and imaging of disease states involving IL- 17.

The present invention is further described by way of illustration only in the following examples, which refer to the accompanying Figures, in which:

Figure 1 : a) Light chain V region of antibody CA048_497.g2 (277 gL2gH4) (SEQ ID NO:7) b) Heavy chain V region of antibody CA048_497.g2 (277 gL2gH4) (SEQ ID NO:9) c) CDRHl (SEQ ID NO:1), CDRH2 (SEQ ID NO:2), CDRH3 (SEQ ID NO:3), CDRLl (SEQ ID NO:4), CDRL2 (SEQ ID NO:5), CDRL3 (SEQ ID NO:6) of antibody CA048_497.g2 (277 gL2gH4). d) Light chain of antibody CA048__497.g2 (SEQ ID NO: 11) e) Light chain of antibody CA048_497.g2 including signal sequence (underlined) (SEQ ID NO:12) f) Heavy chain of antibody CA048_497.g2 (SEQ ID NO: 15) g) Heavy chain of antibody CA048_497.g2 including signal sequence (underlined) (SEQ ID NO: 16) h) DNA encoding light chain variable region of antibody CA048_497.g2 (SEQ ID NO:8) i) DNA encoding heavy chain variable region of antibody CA048_497.g2 (SEQ ID NO: 10) j) DNA encoding light chain of antibody CA048_497.g2 (SEQ ID NO: 13) k) DNA encoding light chain of antibody CA048_497.g2 including signal sequence (SEQ ID NO: 14) 1) DNA encoding heavy chain of antibody CA048_497.g2 (SEQ ID NO:17) m) DNA encoding heavy chain of antibody CA048_497.g2 including signal sequence (SEQ ID NO: 18)

Figure 2: Inhibition of IL-6 production by antibody CA048_497.g2 in HeIa cells stimulated with recombinant human IL- 17

Figure 3 : Inhibition of IL-6 production by antibody CA048_497.g2 in HeIa cells stimulated with natural human IL- 17

DNA manipulations and general methods E. coli strain INVaF' (Invitrogen) was used for transformation and routine culture growth. DNA restriction and modification enzymes were obtained from Roche Diagnostics Ltd. and New England Biolabs. Plasmid preparations were performed using Maxi Plasmid purification kits (QIAGEN, catalogue No. 12165). DNA sequencing reactions were performed using the ABI Prism Big Dye terminator sequencing kit (catalogue No. 4304149) and run on an ABI 3100 automated sequencer (Applied Biosystems). Data was analysed using the program AutoAssembler (Applied Biosystems). Oligonucleotides were obtained from Invitrogen. Genes encoding initial V-region sequences were designed and constructed by an automated synthesis approach by Entelechon GmbH, and modified to generate the grafted versions by oligonucleotide directed mutagenesis. The concentration of IgG was determined using IgG assembly ELISA.

Example 1: Production of a neutralising anti-IL-17 antibody (antibody CA048 497.g2 (277 gL2gH4)l

Female Sprague Dawly rats were immunised with recombinant human IL- 17 (purchased from R & D systems). Rats received four immunisations of 20μg IL-17 in lOOμl Freund's adjuvant. Antibody 277 which binds human IL-17 was isolated using the methods described in WO04/051268. Genes for the heavy chain variable domain (VH) and light chain variable domain (VL) of antibody 277 were isolated and sequenced following cloning via reverse transcription PCR. A series of humanised VL and VH regions were designed using human V-region acceptor frameworks and by varying the number of donor residues in the framework regions. Two grafted VL regions (gLl and 2) and 7 grafted VH regions (gHl-7) were designed and genes were built by oligonucleotide assembly and PCR mutagenesis. The light chain grafted sequences were sub-cloned into the human light chain expression vector pKHlO.l which contains the DNA encoding the human C-Kappa constant region (Km3 allotype). The heavy chain grafted sequences were sub-cloned into the human gamma- 4 expression vector pVhg4P FL, which contains the DNA encoding the human gamma-4 constant region containing the hinge stabilising mutation S241P (Angal et al, supra). Plasmids were co-transfected into CHO cells and the antibodies produced screened for activity in IL- 17 binding and neutralisation assays (e.g. IL- 17 induced IL-6 production in the cell line 3T3-NIH, based on the method described in Yao et al, J. Immunol. 1995; 155, 5483- 5486). Transfections of CHO cells were performed using the Lipofectamine™ 2000 procedure according to manufacturer's instructions (InVitrogen, catalogue No. 11668).

The graft most potent at neutralising IL-17 (gL2gH4) and with the highest expression levels in CHO cells was selected. The V region sequences are shown in Figure 1 (a) and (b) and in SEQ ID NOs: 7 and 9 for the light chain (gL2) and heavy chain (gH4) respectively. This antibody was named CA028_497.g2. The CDRs of this antibody are shown in Figure l(c). The full-length light and heavy chains are shown in Figures l(d) and (f) respectively. The DNA sequences encoding the light and heavy chains are shown in Figures 1 (k) and (m) respectively. The heavy chain acceptor framework is the human germline sequence VH3 1 -U 3-15 with framework 4 coming from this portion of the human JH-region germline JH4. The light chain acceptor framework is the human germline sequence VKl 2-1 -(1) L4, with framework 4 coming from this portion of the human JK-region germline JKl . The amino acid at position 49 in the heavy chain of SEQ ID NO:9 is a donor residue which was found to be essential for good CHO cell expression and affinity for IL-17.

Example 2: Assessment of the affinity of CA028 497.g2 for IL-17

The BIAcore technology monitors the binding between biomolecules in real time and without the requirement for labelling. One of the interactants, termed the ligand, is either immobilised directly or captured on the immobilised surface while the other, termed the analyte, flows in solution over the captured surface. The sensor detects the change in mass as the analyte binds to the ligand to form a complex on the surface. This corresponds to the association process. The dissociation process is monitored when the analyte is replaced by buffer. The affinity of CA028_497.g2 for IL- 17 in the BIAcore assay was assessed with CA028_497.g2 as the ligand and IL- 17 as the analyte.

Determination of the affinity of CA028 497. g2 for IL-17 from different species using CAQ28 497.g2 as the ligand

Capture of CA028_497.g2 by anti-human IgG Fc immobilised on the sensor chip was followed by titration of human IL-17 or IL-17 from other species, over the captured surface. An example of the procedure is given below:

BIA (Biamolecular Interaction Analysis) was performed using a BIAcore 3000 (BIAcore AB). Affinipure F(ab')₂ Fragment goat anti-human IgG, Fc (Jackson ImmunoResearch) was immobilised on a CM5 Sensor Chip via amine coupling chemistry to a capture level of «8000 response units (RUs). HBS-EP buffer (1OmM HEPES pH 7.4, 0.15 M NaCl, 3 mM EDTA, 0.005 % Surfactant P20, BIAcore AB) was used as the running buffer with a flow rate of 10 μL/min. A 10 μL injection of CA028_497.g2 was used for capture by the immobilised anti- human IgG-F(ab)₂. IL-17 was titrated over the captured CA028_497.g2 at various concentrations at a flow rate of 30 μL/min. The surface was regenerated by a 30 μL injection of 40 mM HCl, followed by a 10 μL injection of 5 mM NaOH.

Background subtraction binding curves were analysed using the BIAevaluation software (version 3.2) following standard procedures. Kinetic parameters were determined from the fitting algorithm.

The concentrations of IL-17 from different non-human primate (NHP) species expressed transiently were estimated relative to human IL-17 and these concentrations were then used to determine the affinities of the IL-17s. The affinity was measured at IL-17 concentrations at or below 25 nM. The affinity value determined for CA028_497.g2 was 6.3 pM for human, 10.7 pM for cynomolgus monkey IL-17 and 12.9 pM for marmoset IL-17 (Table 1). The concentration of transient cynomolgus IL- 17 and transient marmoset IL- 17 was estimated based on equivalent human IL- 17 binding.

Table 1 : Affinity of IL-17 for CA028_497.g2

Example 3: Neutralisation of human IL-17 on human cells

The ability of IL-17 to induce IL-6 production from human HeIa cells was used to determine the neutralising potency of CA028_497.g2 for human recombinant IL-17 and mammalian cell (CHO) derived human IL-17 (termed 'natural' IL-17). HeIa cells were obtained from the cell bank at ATCC (ATCC CCL-2). Cells were grown in Dulbecco's modified Eagle's medium (DMEM) supplemented with 10% foetal calf serum, penicillin, gentamycin and glutamine. 1x10⁴ cells were plated out into 96 well flat bottomed tissue culture plates. Cells were incubated overnight and washed once in assay buffer. Either human recombinant IL-17 (25ng ml^" ) or 'natural' IL-17 (25ng ml^"1) was incubated in the presence of a fixed concentration of human TNF-α this mixture was preincubated with CA028_497.g2. Cytokine plus antibody was then added to the HeIa cells which were incubated overnight. The production of IL-6 in the cell culture supernatant was proportionate to the amount of IL-17 added to the cells. Levels of IL-6 release were determined in the cell supernatants using a Meso Scale Discovery 96-Well Multi-Spot IL-6 Human cytokine assay. Essentially this assay is a sandwich immunoassay, where pre-coated anti-human IL-6 capture antibody binds to IL-6 in the cell supernatants or calibrator solutions, and levels are quantified using an IL-6 specific detection antibody. CA028_497.g2 potently neutralised human recombinant IL- 17 and mammalian cell-derived human IL- 17 (Figures 2 and 3). The data from these experiments indicates that the IC₅₀ of CA028_497g.2 was 51ng/mL ± 3ng/mL (0.34nM) against human recombinant IL-17 and 103 ± 7ng/mL (0.7nM) against mammalian cell-derived IL- 17.

It will of course be understood that the present invention has been described by way of example only, is in no way meant to be limiting, and that modifications of detail can be made within the scope of the claims hereinafter. Preferred features of each embodiment of the invention are as for each of the other embodiments mutatis mutandis. All publications, including but not limited to patents and patent applications, cited in this specification are herein incorporated by reference as if each individual publication were specifically and individually indicated to be incorporated by reference herein as though fully set forth.

Claims

56 CLAIMS:

1. A neutralising antibody which binds human IL- 17 comprising a heavy chain, wherein the variable domain of the heavy chain comprises at least one of a CDR having the sequence given in SEQ ID NO:1 for CDR-Hl, a CDR having the sequence given in SEQ ID NO:2 for CDR-H2 and a CDR having the sequence given in SEQ ID NO:3 for CDR-H3.

2. A neutralising antibody according to claim 1, wherein the variable domain of the heavy chain comprises the sequence given in SEQ ID NO:1 for CDR-Hl, the sequence given in SEQ ID NO:2 for CDR-H2 and the sequence given in SEQ ID NO:3 for CDR-H3.

3. A neutralising antibody which binds human IL- 17, comprising a light chain, wherein the variable domain of the light chain comprises at least one of a CDR having the sequence given in SEQ ID NO:4 for CDR-Ll, a CDR having the sequence given in SEQ ID NO: 5 for CDR-L2 and a CDR having the sequence given in SEQ ID NO:6 for CDR-L3.

4. A neutralising antibody according to claim 1 or claim 2, additionally comprising a light chain, wherein the variable domain of the light chain comprises at least one of a CDR having the sequence given in SEQ ID NO:4 for CDR-Ll , a CDR having the sequence given in SEQ ID NO:5 for CDR-L2 and a CDR having the sequence given in SEQ ID NO:6 for CDR-L3.

5. A neutralising antibody according to claim 3 or claim 4 wherein the variable domain of the light chain comprises the sequence given in SEQ ID NO:4 for CDR-Ll, the sequence given in SEQ ID NO:5 for CDR-L2 and the sequence given in SEQ ID NO:6 for CDR-L3.

6. A neutralising antibody which binds human IL- 17, wherein the variable domain of the heavy chain comprises three CDRs and the sequence of CDRH-I has at least 60% identity or similarity to the sequence given in SEQ ID NO:1, the sequence of CDRH-2 has at least 60% identity or similarity to the sequence given in SEQ ID NO:2 and the sequence of CDRH-3 has at least 60% identity or similarity to the sequence given in SEQ ID NO:3.

7. A neutralising antibody according to claim 6, additionally comprising a light chain, wherein the variable domain of the light chain comprises three CDRs and the sequence of CDRL-I has at least 60% identity or similarity to the sequence given in SEQ ID NO:4, the sequence of CDRL-2 has at least 60% identity or similarity to the sequence given in SEQ 57

ID NO: 5 and the sequence of CDRL-3 has at least 60% identity or similarity to the sequence given in SEQ ID NO:6.

8. An antibody according to any one of claims 1 to 5 wherein the heavy chain comprises the sequence given in SEQ ID NO:9.

9. An antibody according to any one of claims 1 to 5, wherein the light chain comprises the sequence given in SEQ ID NO:7.

10. A neutralising antibody which binds human IL-17, having a heavy chain comprising the sequence given in SEQ ID NO:9 and a light chain comprising the sequence given in SEQ ID NO:7.

11. A neutralising antibody which binds human IL- 17, wherein the variable domain of the light chain comprises a sequence having at least 80% identity or similarity to the light chain variable domain of the antibody of claim 10 and wherein the variable domain of the heavy chain comprises a sequence having at least 80% identity or similarity to the heavy chain variable domain of the antibody of claim 10.

12. A neutralising antibody which binds human IL-17, having a heavy chain comprising the sequence given in SEQ ID NO: 15 and a light chain comprising the sequence given in SEQ ID NO-.ll.

13. A neutralising antibody which binds human IL-17, in which the heavy and light chains are at least 80% identical or similar to the corresponding heavy and light chains of the antibody of claim 12.

14. A neutralising antibody having a binding affinity for human IL- 17 of lOOpM or better.

15. A neutralising antibody which binds human IL- 17, which binds to the same epitope as the antibody of claim 10.

16. A neutralising antibody which binds human IL- 17 which has a binding affinity for human IL- 17 of 10OpM or better and cross-blocks the binding of the antibody of claim 10 to human IL-17 or is cross-blocked from binding human IL-17 by the antibody of claim 10.

17. An epitope on human IL-17 bound by the antibody of claim 10. 58

18. A neutralising antibody which binds human IL- 17 which is capable of inhibiting the activity of 0.8nM human IL- 17 by 50% at a concentration of less than 2nM said inhibitory activity being measured on the IL- 17 induced release of IL-6 from HeIa cells.

19. An isolated DNA sequence encoding the heavy and/or light chain(s) of an antibody according to any one of claims 1 to 18.

20. A cloning or expression vector comprising one or more DNA sequences according to claim 19.

21. A vector according to claim 20, wherein the vector comprises the sequences given in SEQ ID NO:14 and SEQ ID NO:18.

22. A host cell comprising one or more cloning or expression vectors according to claim 20 or claim 21.

23. A process for the production of the antibody of any one of claims 1 to 18, comprising culturing the host cell of claim 22 and isolating the antibody.

24. A pharmaceutical composition comprising an antibody according to any one of claims 1 to 18, in combination with one or more of a pharmaceutically acceptable excipient, diluent or carrier.

25. A pharmaceutical composition according to claim 24, additionally comprising other active ingredients.

26. An antibody according to any one of claims 1 to 18 or a pharmaceutical composition according to claim 24 or claim 25, for use in the treatment or prophylaxis of a pathological disorder that is mediated by IL-17, or that is associated with an increased level of IL-17.

27. The use of an antibody according to any one of claims 1 to 18 in the manufacture of a medicament for the treatment or prophylaxis of a pathological disorder that is mediated by IL-17, or that is associated with an increased level of IL-17.