WO2014065245A1 - 弱酸性pH応答性ペプチド及び該ペプチドを含むリポソーム - Google Patents
弱酸性pH応答性ペプチド及び該ペプチドを含むリポソーム Download PDFInfo
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- WO2014065245A1 WO2014065245A1 PCT/JP2013/078497 JP2013078497W WO2014065245A1 WO 2014065245 A1 WO2014065245 A1 WO 2014065245A1 JP 2013078497 W JP2013078497 W JP 2013078497W WO 2014065245 A1 WO2014065245 A1 WO 2014065245A1
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- amino acid
- liposome
- peptide compound
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- 229940117972 triolein Drugs 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
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- 201000005112 urinary bladder cancer Diseases 0.000 description 1
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- JXLYSJRDGCGARV-XQKSVPLYSA-N vincaleukoblastine Chemical compound C([C@@H](C[C@]1(C(=O)OC)C=2C(=CC3=C([C@]45[C@H]([C@@]([C@H](OC(C)=O)[C@]6(CC)C=CCN([C@H]56)CC4)(O)C(=O)OC)N3C)C=2)OC)C[C@@](C2)(O)CC)N2CCC2=C1NC1=CC=CC=C21 JXLYSJRDGCGARV-XQKSVPLYSA-N 0.000 description 1
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- 229960004528 vincristine Drugs 0.000 description 1
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- GVJHHUAWPYXKBD-IEOSBIPESA-N α-tocopherol Chemical compound OC1=C(C)C(C)=C2O[C@@](CCC[C@H](C)CCC[C@H](C)CCCC(C)C)(C)CCC2=C1C GVJHHUAWPYXKBD-IEOSBIPESA-N 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
- A61K47/30—Macromolecular organic or inorganic compounds, e.g. inorganic polyphosphates
- A61K47/42—Proteins; Polypeptides; Degradation products thereof; Derivatives thereof, e.g. albumin, gelatin or zein
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/0012—Galenical forms characterised by the site of application
- A61K9/0019—Injectable compositions; Intramuscular, intravenous, arterial, subcutaneous administration; Compositions to be administered through the skin in an invasive manner
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/10—Dispersions; Emulsions
- A61K9/127—Synthetic bilayered vehicles, e.g. liposomes or liposomes with cholesterol as the only non-phosphatidyl surfactant
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/001—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof by chemical synthesis
Definitions
- the tumor tissue is a special environment having a low pH (around pH 6.5) as compared with physiological conditions (around pH 7.4), but the tumor tissue is specific to respond to such a weak pH change.
- Drug delivery carriers that act on are still in development. So far, in view of the EPR effect (Enhanced Permeation and Retention Effect), a hydrophilic polymer such as polyethylene glycol (PEG) has been modified on the surface of liposomes and used as a carrier for anticancer agents. (For example, Patent Document 1).
- PEG-modified carrier has a rate-determining drug release after delivery to the tumor tissue, and cannot efficiently release the drug within the tumor tissue.
- the peptide-liposome complex described in Patent Document 2 has a positive charge due to the presence of a basic amino acid (lysine or arginine) in the N-terminal region, and the charge does not change depending on pH. Sufficient blood retention cannot be expected.
- a basic amino acid lysine or arginine
- Non-Patent Document 1 uses a His segment as a pH-responsive region, and the neutral His is positively charged when the external environment pH is greatly reduced from 7.4 to 5.0. Although it is a technique for collapsing micelles by increasing the electrostatic repulsion force, His alone is not sufficiently protonated at a weak acidity of pH 6.5, and it is difficult to cause charge reversal. Therefore, drug release with micelle disintegration at pH 6.5 cannot be expected.
- Non-Patent Document 2 is a pH-responsive micelle in which dimethylmaleic acid chemically bonded to a block polymer terminal lysine segment is eliminated by lowering the pH, thereby converting the surface charge from minus to plus.
- dimethylmaleic acid chemically bonded to a block polymer terminal lysine segment is eliminated by lowering the pH, thereby converting the surface charge from minus to plus.
- a positively charged lysine residue is exposed, and even if the pH rises, it does not return.
- JP 2004-10482 A JP-T-2004-523531
- An object of the present invention is to provide a peptide compound for producing a drug delivery carrier capable of releasing a target substance in a weakly acidic pH environment such as cancer tissue.
- the present invention provides the following peptide compounds (1) to (10), liposomes having the peptide compounds, and substance introduction agents using the liposomes.
- a peptide compound composed of a hydrophilic amino acid block and a hydrophobic amino acid block [1] The total number of amino acids of the peptide compound is 24 to 36, [2] the total number of amino acids of the hydrophilic amino acid block is 4 to 10, and the average hydrophobicity is ⁇ 3.0 to ⁇ 1.0, [3] The total number of amino acids in the hydrophobic amino acid block is 20 to 32, has one or more His, and the average hydrophobicity is 1.0 to 2.5.
- Peptide compound is a peptide compound composed of a hydrophilic amino acid block and a hydrophobic amino acid block, [1] The total number of amino acids of the peptide compound is 24 to 36, [2] the total number of amino acids of the hydrophilic amino acid block is 4 to 10, and the average hydrophobicity is ⁇ 3.0 to ⁇ 1.0, [3
- the peptide according to (1) wherein the average hydrophobicity of the hydrophilic amino acid block is ⁇ 2.0 to ⁇ 1.5; the average hydrophobicity of the hydrophobic amino acid block is 1.5 to 2.0.
- the hydrophilic amino acid block is composed of an amino acid having a hydrophobicity of ⁇ 3.0 or less and an amino acid having a hydrophobicity of 0 to ⁇ 1.0; the hydrophobic amino acid block is His
- the amino acid constituting the hydrophilic amino acid block is an amino acid composed of His or Glu and Gly, and the amino acid constituting the hydrophobic amino acid block is His, Leu, Ala, Met, Cys, Phe, Val and Ile.
- the peptide sequence in the hydrophilic amino acid block has 0 to 5 His and the peptide sequence in the hydrophobic amino acid block has 1 to 8 His, (1) to (4) A peptide compound in any of the above.
- the hydrophilic amino acid block is represented by the following formula (I) (AA 1 ) (AA 2 ) (AA 3 ) (AA 4 ) (I) (Wherein any two of AA 1 , AA 2 , AA 3 and AA 4 are His or Glu, and the remaining two are Gly); the hydrophobic amino acid block is represented by the following formula (II 5-8 units represented by), the amino acid sequence of each unit may be the same or different, (AA 5 ) (AA 6 ) (AA 7 ) (AA 8 ) (II) (In the formula, AA 5 , AA 6 , AA 7 and AA 8 are the same or different and represent His, Leu or Ala, provided that at least one of the units of the formula (II) is one or two His.
- a liposome comprising the peptide compound according to any one of (1) to (6) and a lipid.
- the liposome according to (7) comprising 1 to 10 mol% of the peptide compound according to any one of (1) to (6) with respect to the total lipid amount in the liposome.
- a pharmaceutical composition comprising the liposome according to any one of (7) to (10).
- An antitumor agent comprising the liposome according to any one of (7) to (10).
- a method for preventing or treating cancer comprising the step of administering to a mammal an effective amount for preventing or treating the cancer of the liposome according to any one of (7) to (10).
- the liposome according to any one of (7) to (10) for use in the prevention or treatment of cancer.
- a liposome capable of being released in a weakly acidic cellular environment around pH 6.5 without releasing a low-molecular target substance encapsulated therein under physiological conditions around pH 7.4 is provided. it can.
- the liposome of the present invention can act by releasing a target substance in such a weak acidic region, an excellent drug delivery system can be provided.
- the liposome of the present invention can retain the encapsulated target substance under physiological conditions of pH 7.4, and can respond sensitively even to weak acidity (pH 6.5), so that it reaches the tumor by the EPR effect. After that, under the weakly acidic conditions in the tumor surrounding environment, the electrostatic repulsion of the hydrophilic block and / or the decrease of the hydrophobic interaction of the hydrophobic block is induced to release the encapsulated target substance. Has usefulness.
- the result of HPLC of the peptide compound 1 (sequence number 1) obtained in Example 1 is shown.
- the result of MALDI-TOF-MS of the peptide compound 1 (SEQ ID NO: 1) obtained in Example 1 is shown.
- the result of HPLC of the peptide compound 2 (sequence number 2) obtained in Example 2 is shown.
- the result of MALDI-TOF-MS of the peptide compound 2 (SEQ ID NO: 2) obtained in Example 2 is shown.
- the result of HPLC of the peptide compound 3 (sequence number 3) obtained in Example 3 is shown.
- the result of MALDI-TOF-MS of the peptide compound 3 (SEQ ID NO: 3) obtained in Example 3 is shown.
- the result of the HPLC of the comparative compound 1 (sequence number 4) obtained in the comparative example 1 is shown.
- the result of MALDI-TOF-MS of Comparative Compound 1 (SEQ ID NO: 4) obtained in Comparative Example 1 is shown.
- the result of the HPLC of the comparative compound 2 (sequence number 5) obtained in the comparative example 2 is shown.
- the result of MALDI-TOF-MS of Comparative Compound 2 (SEQ ID NO: 5) obtained in Comparative Example 2 is shown.
- the result of HPLC of the comparison compound 3 (sequence number 6) obtained in the comparative example 3 is shown.
- the result of MALDI-TOF-MS of Comparative Compound 3 (SEQ ID NO: 6) obtained in Comparative Example 3 is shown.
- FIG. 2 shows CD spectra of peptide compound 1 alone and peptide-introduced liposomes. The antitumor effect of doxorubicin (Dox) simple substance and Dox encapsulated liposome in Test Example 5 is shown.
- the liposome of the present invention is composed of a peptide compound and a liposome-forming component.
- the peptide compound of the present invention is composed of a hydrophilic amino acid block and a hydrophobic amino acid block, and the total number of amino acids is 24 to 36, preferably 24 to 32, and more preferably 24 to 28.
- the total number of amino acids in the hydrophilic amino acid block is 4 to 10, preferably 4 to 8.
- the total number of amino acids in the hydrophobic amino acid block is 20 to 32, preferably 20 to 24. is there.
- the peptide compound of the present invention is one in which one hydrophilic amino acid block and one hydrophobic amino acid block are linked by a peptide bond, and any amino acid block may be on the N-terminal side. It is preferably on the N-terminal side.
- the peptide compound of the present invention has at least one His in the hydrophobic amino acid block, but it is essential from the viewpoint of responsiveness to weak acid that amino acids having a hydrophobicity of -3.0 or less containing His are not adjacent to each other. It is. Further, those having 1 to 13 His in the sequence of the peptide compound are preferable.
- the hydrophilic amino acid block and the hydrophobic amino acid block constituting the peptide compound of the present invention have a specific average hydrophobicity.
- the hydrophobicity of the amino acid used in the present invention is, for example, J.P. Mol. Biol. , (1982) 157, 105-132, and each amino acid constituting a living body exhibits a specific hydrophobicity (see Table 1).
- the average hydrophobicity is described in, for example, Molecular Medicine 4: 240-257, 1998, and is obtained by dividing the total hydrophobicity of amino acids for each block below by the number of amino acids.
- the hydrophilic amino acid block is composed of amino acids having a hydrophobicity of 0 or less, and the hydrophobic amino acid block is composed of His and amino acids exceeding 0. Therefore, the boundary between the hydrophilic amino acid block and the hydrophobic amino acid block is determined by the hydrophobicity of amino acids other than His. When His is present at the boundary, it is included in the hydrophilic amino acid block.
- the hydrophilic amino acid block constituting the peptide compound of the present invention is an amino acid combination having an average hydrophobicity of ⁇ 3.0 to ⁇ 1.0, preferably ⁇ 2.0 to ⁇ 1.5. Any of these may be used, and those composed of an amino acid having a hydrophobicity of ⁇ 3.0 or less and an amino acid having a hydrophobicity of 0 to ⁇ 1.0 are preferred, and those composed of His or Glu and Gly are preferred. More preferably, those composed of His and Gly are more preferable. Further, those having 0 to 5 His in the peptide sequence in the hydrophilic amino acid block are preferable. More specifically, a hydrophilic amino acid block represented by the following formula (I) is particularly preferable.
- the hydrophobic amino acid block constituting the peptide compound of the present invention may be any amino acid combination having an average hydrophobicity of 1.0 to 2.5, preferably 1.5 to 2.0. , His and those composed of amino acids with a hydrophobicity exceeding 0 are preferable, and those composed of His and any amino acid selected from Leu, Ala, Met, Cys, Phe, Val, or Ile are more preferable.
- His and those composed of Leu or Ala, which are amino acids that easily adopt an ⁇ -helix structure, are particularly preferable. Further, those having 1 to 8 His in the peptide sequence in the hydrophobic amino acid block are preferable. More specifically, a hydrophobic amino acid block that includes 5 to 8 units represented by the following formula (II) and whose amino acid sequences may be the same or different is particularly preferable.
- Particularly preferred peptide compounds of the present invention include His-Gly-His-Gly-Leu-Ala-Leu-Leu-Ala-His-Ala-Leu-Leu-Ala-His-Ala-Ala-Leu-Ala-His.
- the peptide compound of the present invention must be composed of the hydrophilic amino acid block and the hydrophobic amino acid block as described above.
- Peptide compounds consisting only of hydrophobic amino acid blocks are incorporated into the hydrophobic part of the liposome and protons cannot enter the liposome, so the peptide compound does not respond even if the surrounding environment is acidic, and the structure of the liposome does not change. There seems to be nothing.
- peptide compounds consisting only of hydrophilic amino acid blocks cannot be incorporated into liposomes.
- the C-terminal of the peptide compound of the present invention may have a C-terminal protecting group.
- the C-terminal protecting group includes a group that forms an amide with the carbon atom of the C-terminal carboxyl, or a group that forms an ester with the oxygen atom of the carboxyl.
- Examples of the group that forms an ester include alkyl groups, in particular, linear or branched alkyl groups having 1 to 5 carbon atoms (C 1 -C 5 alkyl groups), such as methyl group, ethyl group, and propyl group.
- Groups that form amides include amine functional groups such as amino groups, or alkylamino functional groups such as mono C 1 -C 5 alkylamino groups such as methylamino, ethylamino, dimethylamino, diethylamino, methylethylamino, and the like, and A di-C 1 -C 5 alkylamino group is included, preferably an amide-forming group, and more preferably an amino group.
- the peptide compound of the present invention can be produced by a known peptide synthesis method, particularly a liquid phase synthesis method or a solid phase synthesis method. It can also be synthesized by a method in which DNA encoding the peptide compound of the present invention is introduced into a host cell by gene recombination technology and expressed. For example, in the solid phase synthesis method, the carboxyl group of an N-protected amino acid in which the amino group of the amino acid corresponding to the C-terminus is protected with a urethane-type protecting group such as a 9-fluorenylmethyloxycarbonyl (Fmoc) group is converted to an amino group.
- a urethane-type protecting group such as a 9-fluorenylmethyloxycarbonyl (Fmoc) group
- the insoluble resin having an amino group is not particularly limited, but is preferably an Fmoc-NH-SAL resin (4- (2 ′, 4′-dimethoxyphenyl-Fmoc-aminoethyl) phenoxy linker resin), and directly by cleavage.
- the object can be given.
- the protected amino acid used for the synthesis of the peptide compound of the present invention can be obtained by protecting the functional group with a known protecting group by a known method, and a commercially available protected amino acid can also be used.
- the protecting group known ones can be used. For example, methoxycarbonyl group, ethoxycarbonyl group, tert-butoxycarbonyl group, 9-fluorenylmethoxycarbonyl group, benzyloxycarbonyl group, 4-methoxybenzyloxycarbonyl group, 2 2,2-trichloroethyloxycarbonyl group, formyl group, acetyl group, propionyl group, butyryl group and the like can be used.
- a known method such as, for example, the DIPCDI (diisopropylcarbodiimide) -HOBt (1-hydroxybenzotriazole) method can be used.
- This condensation reaction can be carried out in a known solvent, and examples thereof include organic solvents such as dimethylformamide.
- the elimination reagent for the protecting group of the amino group is not limited, and the protecting group such as the Fmoc group can be cleaved by a known reagent such as piperidine / dimethylformamide.
- Deprotection of the urethane-type protecting group can be carried out using catalytic reduction, trifluoroacetic acid or the like. Other protecting groups can also be deprotected by known methods.
- the degree of progress of the condensation reaction at each stage of the synthesis can be confirmed by a known method such as a ninhydrin reaction method. As described above, a protected peptide having a desired amino acid sequence can be obtained.
- the resin and the protecting group can be removed simultaneously by treatment with TMSBr (trimethylsilyl bromide), TFA (trifluoroacetic acid) or the like.
- TMSBr trimethylsilyl bromide
- TFA trifluoroacetic acid
- the C-terminus of the peptide compound can be obtained as COOH or CONH 2 depending on the type of resin used.
- the peptide compound of the present invention thus obtained is isolated and purified by known means such as extraction, recrystallization, various chromatography (gel filtration, ion exchange, distribution, adsorption), electrophoresis, countercurrent distribution, etc.
- the method by reverse phase high performance liquid chromatography is preferred.
- the liposome of the present invention is a closed vesicle having a lipid bilayer structure
- it may be a multilamellar liposome (MLV), an SUV (small unilamellar vesicle), an LUV (large uniaxial molecular vesicle), or a GUV (giant unimolecular vesicle).
- MUV multilamellar liposome
- SUV small unilamellar vesicle
- LUV large uniaxial molecular vesicle
- GUV giant unimolecular vesicle
- the type of lipid constituting the lipid bilayer is not particularly limited, and specific examples thereof include phosphatidylcholine (for example, dioleoylphosphatidylcholine, dilauroylphosphatidylcholine, dimyristoylphosphatidylcholine, dipalmitoylphosphatidylcholine).
- phosphatidylcholine for example, dioleoylphosphatidylcholine, dilauroylphosphatidylcholine, dimyristoylphosphatidylcholine, dipalmitoylphosphatidylcholine.
- phosphatidylglycerol eg, dioleoylphosphatidylglycerol, dilauroylphosphatidylglycerol, dimyristoylphosphatidylglycerol, dipalmitoylphosphatidylglycerol, distearoylphosphatidylglycerol (DSPG)
- phosphatidylethanolamine eg, Dioleoylphosphatidylethanolamine, dilauro Phosphatidylethanolamine, dimyristoylphosphatidylethanolamine, dipalmitoylphosphatidylethanolamine, distearoylphosphatidiethanolamine
- phospholipids such as phosphatidylserine, phosphatidylinositol, phosphatidic acid, cardiolipin, etc .; sphingomyelin, ganglioside, etc.
- the phospholipid may be egg yolk, soybean or other natural lipid derived from animals and plants (eg, egg yolk lecithin, soybean lecithin, etc.), synthetic lipid or semi-synthetic lipid. These lipids can be used alone or in admixture of two or more.
- lipid bilayers for example, cholesterol, cholesterol succinic acid, lanosterol, dihydrolanosterol, desmosterol, dihydrocholesterol to physically or chemically stabilize the lipid bilayer and to regulate the fluidity of the membrane
- Sterols derived from animals such as stigmasterol, sitosterol, campesterol, sterols derived from plants such as brassicasterol; Sterols derived from microorganisms such as timosterol and ergosterol; Sugars such as glycerol and sucrose; Triolein 1 type, or 2 or more types can be contained among glycerol fatty acid esters, such as trioctanoin.
- the content is not particularly limited, but is preferably 5 to 40% (molar ratio) with respect to the total amount of lipid constituting the lipid bilayer, and is preferably 10 to 30% (molar ratio). Further preferred.
- Antibiotics such as tocopherol, propyl gallate, ascorbyl palmitate, butylated hydroxytoluene, etc .; charged substances that impart a positive charge such as stearylamine and oleylamine; negative charges such as dicetyl phosphate Charged substances; membrane proteins such as membrane surface proteins and membrane integral proteins can be contained, and the content can be appropriately adjusted.
- the liposome of the present invention preferably contains a cationic lipid (cationic liposome).
- cationic liposome examples include DODAC (dioctadecyldimethylammonium chloride), DOTMA (N- (2,3-dioleoyloxy) propyl-N, N, N-trimethylaluminium), DDAB (didedeoxylamidium-dibromo-dibromo-dibromo-dibromo-dibromo-dibromo-dibromo-dimethyl-dibromo-dibromo-dibromo-dibromo-dibromo-dibromo-dibromo-dibromo-dibromo-dibromo-ammonium)).
- DODAC dioctadecyldimethylammonium chloride
- DOTMA N- (2,3-dioleoy
- DOTMA and DSTAP have a quaternary amine and are always positively charged, while DODAP has a tertiary amine and has no charge at physiological pH.
- DODAP has a tertiary amine and has no charge at physiological pH.
- the liposome of the present invention preferably contains an auxiliary lipid.
- the co-lipid for example, EPC (egg phosphatidylcholine), DLPC (dilinoleoylphosphatidylcholine), DMPC (dimyristoylphosphatidylcholine), DPPC (dipalmitoylphosphatidylcholine), DSPC (distearoylphosphatidylcholine), POPC (palmitoyloleoylphosphatidylcholine), DOPC (dioleoylphosphatidylcholine), DOPE (dioleoylphosphatidylethanolamine), SOPE ( stearyloylylphosphatidyl holine), and the like.
- EPC egg phosphatidylcholine
- DLPC diilinoleoylphosphatidylcholine
- DMPC diimyristoylphosphatidylcholine
- DPPC dipal
- the liposome of the present invention has the peptide compound of the present invention as a constituent component.
- the peptide compound of the present invention is used, it is preferably added at a ratio of about 1 to 10 mol% when the lipid constituting the liposome is 100 mol%.
- the liposome of the present invention can be modified with a hydrophilic polymer.
- hydrophilic polymers examples include polyalkylene glycols (polyalkylene glycol copolymers such as polyethylene glycol, polypropylene glycol, polybutylene glycol, or block copolymers of polyethylene glycol and polypropylene glycol), dextran, pullulan, ficoll, and polyvinyl alcohol.
- polyalkylene glycol polyethylene glycol, Polypropylene glycol, polybutylene glycol, or block copolymer of polyethylene glycol and polypropylene glycol Copolymers of polyalkylene glycols such as coalescence
- PEG polyethylene glycol
- PEG examples include DSPE (distaylyl phospholipidephthalamine) -PEG2000, DMPE (dimyristyl phosphatidylethylenolene) -PEG2000, DSG (distaylylethyl ceryl PEG-2000-PEG, PEG2000, DMG (dimyristolyl PEG) Of these, stearyl PEG2000 or C8 ceramide-PEG2000 is preferred.
- the length of PEG can be appropriately selected within a molecular weight range of about 500 to 10,000. Those skilled in the art can select the molecular weight of other hydrophilic polymers as appropriate.
- liposomes are PEG-modified, stearyl-modified PEG (STR-PEG), C8 ceramide-PEG, and cholesterol-PEG are used for stable storage without impairing the functional expression of the target substance (eg, nucleic acid drugs such as siRNA).
- the target substance eg, nucleic acid drugs such as siRNA
- DSPE-PEG, DSG-PEG, C16 ceramide-PEG and the like are preferably used in order to improve blood stability.
- the hydrophilic polymer is preferably modified at a ratio of about 1 to 15 mol% when the lipid constituting the liposome is 100 mol%.
- the liposome of the present invention can be prepared using a known method such as a hydration method, an ultrasonic treatment method, an ethanol injection method, an ether injection method, a reverse phase evaporation method, or a freezing / thawing method.
- Lipids which are constituents of the lipid bilayer, are dissolved in an organic solvent, and then the organic solvent is removed by evaporation to obtain a lipid membrane.
- the lipid membrane is hydrated and stirred or sonicated to produce liposomes.
- this invention peptide compound can be introduce
- auxiliary lipid (EtOH solution) / cationic lipid (EtOH solution) can be changed as appropriate.
- Preferred liposomes of the present invention include liposomes having a composition of EPC / DOTAP / present peptide compound, EPC / present peptide compound, or EPC / DSPG / present peptide compound, preferably EPC / DOTAP / present peptide A liposome having the composition of the compound.
- the zeta potential of the liposome of the present invention is about ⁇ 50 to +50 mV, preferably about ⁇ 40 to +40 mV, more preferably about ⁇ 30 to +30 mV at a pH near neutrality (for example, pH 7 or 7.4).
- the zeta potential can be measured using a zeta sizer.
- the average particle diameter of the liposome of the present invention is not particularly limited, but is, for example, a particle diameter of 30 to 1000 nm, preferably 50 to 500 nm, more preferably 60 to 200 nm.
- the average particle diameter can be measured by, for example, a dynamic light scattering method, a static light scattering method, an electron microscope observation method, an atomic force microscope observation method, or the like.
- the target substance to be delivered into the cell can be encapsulated inside the liposome of the present invention.
- the target substance When the target substance is water-soluble, it is possible to encapsulate the target substance in the aqueous phase inside the liposome by adding the target substance to an aqueous solvent used when hydrating the lipid membrane in the production of liposomes. it can.
- the target substance When the target substance is fat-soluble, the target substance can be encapsulated in the lipid bilayer of the liposome by adding the target substance to an organic solvent used in the production of the liposome.
- “encapsulation” includes a target substance inside hollow particles such as liposomes.
- the biological species to which the target substance is delivered is not particularly limited as long as it is a vertebrate, but is preferably a mammal.
- mammals include humans, monkeys, cows, sheep, goats, horses, pigs, rabbits, dogs, cats, rats, mice, guinea pigs, and the like.
- the liposome of the present invention can be used in the state of a dispersion, for example.
- a dispersion solvent for example, a buffer solution such as physiological saline, phosphate buffer, citrate buffer, and acetate buffer can be used.
- additives such as sugars, polyhydric alcohols, water-soluble polymers, nonionic surfactants, antioxidants, pH regulators, hydration accelerators may be added to the dispersion.
- the liposome of the present invention can also be used in a state where the dispersion is dried (for example, freeze-dried, spray-dried, etc.).
- the dried liposome can be made into a dispersion by adding a buffer solution such as physiological saline, phosphate buffer, citrate buffer, or acetate buffer.
- the liposome of the present invention can be used both in vitro and in vivo.
- examples of the administration route include intravenous injection, infusion and the like, and the dosage and administration frequency depend on the type and amount of the target substance enclosed in the liposome of the present invention. It can be adjusted accordingly.
- a pharmaceutical carrier can be blended as necessary, and various administration forms can be adopted depending on the purpose of prevention or treatment.
- a pharmaceutical carrier for example, an injection can be employed.
- Various dosage forms can be produced by conventional pharmaceutical methods known to those skilled in the art.
- pH regulators, buffers, stabilizers, tonicity agents, etc. can be added to the target substance, and subcutaneous, intramuscular and intravenous injections are produced by conventional methods. be able to.
- pH adjuster and buffer examples include sodium citrate, sodium acetate, sodium phosphate and the like.
- stabilizer examples include sodium pyrosulfite, EDTA, thioglycolic acid, thiolactic acid and the like.
- isotonic agents include sodium chloride, glucose, D-mannitol, glycerin and the like.
- the liposome of the present invention can be safely administered without any weight loss or liver damage.
- the substance introduction agent of the present invention can be used either in vitro or in vivo to deliver a target substance to a weakly acidic pH site.
- the weakly acidic pH site include an inflammatory site, a tumor site, an infection site, and the like, and a tumor site is particularly preferable.
- the type of the target substance to be encapsulated is not particularly limited.
- drugs drugs, nucleic acids, peptides (bioactive peptides such as oxytocin, bradykinin, thyrotropin releasing factor, enkephalin, peptide hormones, etc.), proteins (enzymes, interleukins, etc.) And one or more selected from the group consisting of sugars or complexes thereof, and can be appropriately selected depending on the purpose of diagnosis, treatment, etc. .
- the “nucleic acid” includes analogs or derivatives thereof (for example, siRNA, peptide nucleic acid (PNA), phosphorothioate DNA, etc.) in addition to DNA or RNA. Further, the nucleic acid may be either single-stranded or double-stranded, and may be either linear or circular.
- the liposome of the present invention it is possible to enclose a plurality of types of target substances having different molecular weights in the same liposome and make a difference in the release site.
- a low molecular weight substance having a molecular weight of 700 or less releases specifically at weakly acidic pH, but a high molecular weight substance of 700 or more does not release in a weakly acidic pH environment, but is released after being taken into tumor cells. It is possible to apply.
- the target substance is contained in an amount of 0.1 to 60 parts by mass, preferably 1 to 40 parts by mass with respect to 100 parts by mass of the total lipid and peptide constituting the liposome.
- any drug can be used as long as it is a drug used in a tissue having a weakly acidic environment (pH 6.5), for example, an anticancer drug.
- an anticancer drug Specifically, tegafur, doxorubicin, daunorubicin, cisplatin, oxaliplatin, carboplatin, paclitaxel, irinotecan, SN-38, actinomycin D, vincristine, vinblastine, methotrexate, azathioprine, fluorouracil, mitomycin C, docetaxel C, docetaxel, Cyclophosphamide, capecitabine, epirubicin, gemcitabine, mitoxantrone, leucovorin, vinorelbine, trastuzumab, etoposide, estramustine, prednisone, interferon alpha, interleukin-2, bleomycin, ifosfamide, mesna, altret
- Anti-inflammatory agents include non-steroidal anti-inflammatory agents (eg, ibuprofen, ketoprofen, naproxen, indomethacin, aspirin, diclofenac, piroxicam, acetaminophen, celecoxib, rofecoxib, etc.), steroidal anti-inflammatory agents (eg, hydrocortisone, prednisolone) Dexamethasone, betamethasone, etc.).
- non-steroidal anti-inflammatory agents eg, ibuprofen, ketoprofen, naproxen, indomethacin, aspirin, diclofenac, piroxicam, acetaminophen, celecoxib, rofecoxib, etc.
- steroidal anti-inflammatory agents eg, hydrocortisone, prednisolone
- the target substance is a nucleic acid
- mdRNA partial double-stranded RNA
- ndsRNA nicked dsRNA
- gdsRNA gapped dsRNA
- siRNA siRNA
- miRNA microRNA
- shRNA hairpin RNA
- shRNA short interference oligonucleotide
- substituted short interference oligonucleotide substituted short interference oligonucleotide
- chemically modified dsRNA post-transcriptional gene silencing RNA
- ptgsRNA post-transcriptional gene silencing RNA
- the double-stranded RNA (dsRNA) is preferably exemplified.
- the target substance can be used alone or in admixture of two or more.
- two or more siRNAs can be used in combination.
- the double stranded RNA is at the 3 ′ end of the double stranded RNA, such as an overhang containing deoxyribonucleotides or two deoxyribonucleotides (eg, thymidine, adenine). It may contain 1 to 4 nucleotide overhangs at one or both ends. Double stranded RNA may have blunt ends at one or both ends. In some embodiments, the 5 'ends of the first and second strands are phosphorylated.
- the 3 'terminal nucleotide overhang may comprise a ribonucleotide or deoxyribonucleotide that is chemically modified in the sugar, base, or backbone of the nucleic acid.
- the 3'-terminal nucleotide overhang may comprise one or more universal base ribonucleotides.
- the 3 'terminal nucleotide overhang may comprise one or more acyclic nucleotides.
- the dsRNA is 5 ′ phosphate (Martinez et al., Cell. 110: 563-574, 2002; and Schwartz et al., Molec. Cell. 10: 537-). 568, 2002) or a terminal phosphate group such as 5 ', 3' diphosphate.
- Double-stranded RNA consists of 2′-deoxy, 2′-O-methyl, 2′-O-methoxyethyl, 2′-O-2-methoxyethyl, halogen, 2′-fluoro, 2′-O-allyl, Or it may further comprise 2 ′ sugar substitutions such as any combination thereof.
- the double stranded RNA is alkyl, abasic, deoxyabasic, glyceryl, dinucleotide, acyclic nucleotide, on one or both ends of the first strand or one or more second strands, It further includes an end cap substituent such as an inverted deoxynucleotide moiety, or any combination thereof.
- the double stranded RNA is independently phosphorothioate, chiral phosphorothioate, phosphorodithioate, phosphate triester, aminoalkylphosphate triester, methylphosphonate, alkylphosphonate, 3′- Alkylene phosphonates, 5'-alkylene phosphonates, chiral phosphonates, phosphonoacetates, thiophosphonoacetates, phosphinates, phosphoramidates, 3'-aminophosphoramidates, aminoalkyl phosphoramidates, At least one modified internucleoside linkage, such as thionophosphoramidate, thionoalkylphosphonate, thionoalkylphosphate triester, selenophosphate, boranophosphate linkage, or any combination thereof. Further may be included.
- Double-stranded RNA is 5-methylcytosine; 5-hydroxymethylcytosine; xanthine; hypoxanthine; 2-aminoadenine; 6-methyl, 2-propyl, or other alkyl derivatives of adenine and guanine; 8-substituted Adenine and guanine (8-aza, 8-halo, 8-amino, 8-thiol, 8-thioalkyl, 8-hydroxyl, etc.); 7-methyl, 7-deaza, and 3-deazaadenine and guanine; 2-thiouracil; 2 2-thiocytosine; 5-methyl, 5-propynyl, 5-halo (such as 5-bromo or 5-fluoro), 5-trifluoromethyl, or other 5-substituted uracil and cytosine; and 6- Substitution or modification (chemical modification) by using nucleic acid analogs such as azouracil Including) can be.
- RNA such as double-stranded RNA (dsRNA) can be chemically modified.
- Non-limiting examples of such chemical modifications include internucleotide phosphorothioate linkages, 2′-deoxyribonucleotides, 2′-O-methylribonucleotides, 2′-deoxy-2′-fluororibonucleotides, “acyclic” "Incorporation of nucleotides, 5'-C-methyl nucleotides, and glyceryl and / or reverse deoxyabasic residues at the termini. These chemical modifications can maintain RNAi activity in the cell.
- the present invention provides a pharmaceutical composition containing the liposome.
- the diseases targeted by the pharmaceutical composition of the present invention for prevention and treatment can be selected according to the type of the target substance and are not particularly limited.
- Examples of the pharmaceutical composition of the present invention include antitumor agents. .
- Example 1 Synthesis of HGHGLALLAHALLAHAALAHAALA (SEQ ID NO: 1, Peptide Compound 1) Starting from Fmoc-Ala-HMP Resin, an amino acid, a condensing agent (HBTU / HOBt), and a reaction accelerator (DIEA) were each resin on a 0.1 mM scale.
- the peptide of SEQ ID NO: 1 was synthesized by the Fmoc solid phase synthesis method using 4 equivalents (HBTU: MW 379.2, HOBt, Anhydrous: MW 135.1, DIEA: MW 129.2).
- TFA trifluoroacetic acid
- 125 ml TFA, 0.25 ml H 2 O, 0.375 g phenol, 0.125 ml ethanedithiol and 0.25 ml thioanisole was added to the synthesized resin, and the mixture was ice-cooled for 15 minutes.
- the reaction was carried out at room temperature for 2 hours, and the peptide was excised from the resin and precipitated with diethyl ether to obtain a crude peptide.
- Purification work was performed by HPLC and lyophilized. The purity test was performed by HPLC and MALDI-TOF-MS. Analysis was carried out under the following HPLC conditions to obtain the target peptide compound 1 (SEQ ID NO: 1) as a single peak.
- Example 2 Synthesis of GHHGALLALLHALAAAALHAAALA (peptide compound 2) Peptide compound 2 (SEQ ID NO: 2) was obtained by the same method as in Example 1. Calculated molecular weight: 2320.7, measured value: 230.004. The results of HPLC and MALDI-TOF-MS are shown in FIG. The average hydrophobicity is shown in Table 3 described later.
- Example 3 Synthesis of EGEGLALLAHALLAHALALAHAALA (peptide compound 3) Peptide compound 3 (SEQ ID NO: 3) was obtained by the same method as in Example 1. Calculated molecular weight: 2304.6, measured value: 2305.14. The results of HPLC and MALDI-TOF-MS are shown in FIG. The average hydrophobicity is shown in Table 3 described later.
- Comparative Example 1 Synthesis of HHGGLLLHHHAAAAAALLLAAAAA (Comparative Compound 1) Synthesis was performed in the same manner as in Example 1 to obtain Comparative Compound 1 (SEQ ID NO: 4). Calculated molecular weight: 2320.7, measured value: 2320.65. The results of HPLC and MALDI-TOF-MS are shown in FIG. The average hydrophobicity is shown in Table 3 described later.
- Comparative Example 3 Synthesis of HGHGLALLAHALLAHAAAAL (Comparative Compound 3) Synthesis was performed in the same manner as in Example 1 to obtain Comparative Compound 3 (SEQ ID NO: 6). Calculated molecular weight: 1928.2, found: 1929.58. The results of HPLC and MALDI-TOF-MS are shown in FIG. The average hydrophobicity is shown in Table 3 described later.
- liposome 1 composed of EPC / DOTAP / peptide compound 1 (lipid concentration 10 mM).
- Test Example 1 Measurement of Encapsulated Drug Leakage under Different pH Conditions (1) After preparing a peptide-containing lipid thin film by the same method as in Example 4, a 30 mM solution of calcein (Mw 622.55) was added. Calcein-encapsulated liposome 1 was prepared in the same manner. Unencapsulated calcein was removed by gel filtration (Sephadex G50).
- the liposomes were diluted and suspended with a buffer having a different pH, incubated at 37 ° C. for 10 minutes, and then leaked using a plate reader (infinite M200, TECAN).
- the fluorescence ( ⁇ ex: 488 nm, ⁇ em: 517 nm) of the calcein thus prepared was measured.
- the fluorescence of calcein leaked when 1% Triton-X100 was mixed with the liposome was defined as the complete leakage amount.
- the leakage rate was calculated by the following formula. The results are shown in FIG.
- Leakage rate (%) (F sample ⁇ F pH 7.4 ) / (F triton ⁇ F pH 7.4 ) ⁇ 100
- F sample fluorescence of calcein leaked from liposome under each pH
- F pH 7.4 fluorescence of calcein leaked from liposome at pH 7.4
- F triton fluorescence of calcein when 1% Triton-X100 was mixed with the liposome No leakage was observed at pH 7.4, but about 100% of calcein leakage was observed at pH 6.5.
- Example 3 After preparing a peptide-containing lipid thin film in the same manner as in Example 4, a 15 mM solution of calcein (Mw 622.55) and a 1 mg / ml solution of Texas Red labeled dextran (Mw 3,000) were added. A two-component encapsulated liposome 1 was prepared in the same manner as in Example 4. Unencapsulated calcein and dextran were removed by dialysis using a dialysis membrane (fractionated molecular weight: 14,000). The amount of leakage of the encapsulated Texas Red labeled dextran and calcein from the liposome was measured in the same manner as described above. The results are shown in FIG.
- the liposome of the present invention can be leaked from a low molecular weight compound in a pH-dependent manner, and when a compound having a different molecular weight is encapsulated, the compound can be leaked stepwise according to the molecular weight.
- Test Example 2 Peptide of peptide alone and peptide-introduced liposome at different pH conditions (presentation of necessity of pH responsiveness and membrane structure base)
- the peptide compound 1 alone obtained in Example 1 and the peptide-introduced liposomes obtained in accordance with Example 4 were suspended in PBS ( ⁇ ) of different pH, and J-720WI (JASCO) CD (Circular Dichroism) spectrum was measured using a product manufactured by Co., Ltd. The results are shown in FIG.
- ⁇ -helix means an ⁇ -helix structure
- random coil structure means a state where no clear secondary structure is taken.
- Example 5 Preparation of Liposomes with Different Lipid Composition
- An anionic liposome 3 in which EPC / DSPG / peptide compound 1 1/1/5 mol% was prepared according to the same method as in Example 4.
- Test Example 3 Measurement of Encapsulated Drug Leakage in Various Liposomes Calcein was encapsulated in the liposome 1 obtained in Example 4 and the liposomes 2 and 3 obtained in Example 5, respectively, and pH was measured in the same manner as in Test Example 1. Responsiveness was examined. As a result, no leakage of calcein was observed in any liposome at pH 7.4, but cationic liposome 1 was the best at pH 6.5, and anionic liposome 3 and neutral liposome 2 leaked in this order. Decreased. That is, it was suggested that it is most preferable to mount the peptide compound on the cationic liposome in order for the liposome to be responsive at a weak low pH.
- Example 6 In accordance with the method described in Example 4, liposome 2 into which peptide compound 2 obtained in Example 2 was introduced was prepared, and calcein-encapsulated liposome 2 was prepared by the same preparation method as in Test Example 1.
- Example 7 In accordance with the method described in Example 4, liposome 3 into which peptide compound 3 obtained in Example 3 was introduced was prepared, and calcein-encapsulated liposome 3 was prepared by the same preparation method as in Test Example 1.
- Comparative Example 4 In accordance with the method described in Example 4, comparative liposome 1 into which comparative compound 1 obtained in Comparative Example 1 was introduced was prepared, and calcein-encapsulated comparative liposome 1 was prepared by the same preparation method as in Test Example 1.
- Comparative Example 5 In accordance with the method described in Example 4, comparative liposome 2 into which comparative compound 2 obtained in comparative example 2 was introduced was prepared, and calcein-encapsulated comparative liposome 2 was prepared by the same preparation method as in test example 1.
- Comparative Example 6 In accordance with the method described in Example 4, comparative liposome 3 into which comparative compound 3 obtained in Comparative Example 3 was introduced was prepared, and calcein-encapsulated comparative liposome 3 was prepared by the same preparation method as in Test Example 1.
- Test Example 4 Average Hydrophobicity and Encapsulated Drug Leakage Rate of Peptide-Introduced Liposomes For each calcein-encapsulated liposome obtained in Examples 4, 6, and 7 and Comparative Examples 4 to 6, the pH was adjusted to 7 by the same method as in Test Example 1. The leak rate of calcein at .4 and pH 6.5 was calculated. The results are shown in Table 3.
- liposome into which the comparative compound 2 having a changed average hydrophobicity was introduced the leakage of the encapsulated drug was remarkably lowered even when the pH was changed from 7.4 to 6.5, and the pH responsiveness was insufficient.
- liposomes were prepared by introducing Comparative Compound 3 with 4 residues reduced relative to Peptide Compound 1, but significantly aggregated at pH 6.5 or lower. Attempts were made to encapsulate calcein, but even at pH 7.4, the same fluorescence intensity was observed as when treated with Triton. It was suggested that the drug cannot be encapsulated.
- EPC egg yolk phosphatidylcholine
- DOTAP dioleoyltetraammoniumpropane
- the solution was dispensed into a test tube, and the ethanol solution of peptide compound 1 obtained in Example 1 was added in an amount of 5 mol% of the total lipid amount, and further the ethanol solution of polyethylene glycol-distearoylphosphatidylethanolamine (PEG-DSPE) was totaled.
- PEG-DSPE polyethylene glycol-distearoylphosphatidylethanolamine
- a lipid thin film was prepared by adding 5 mol% of the lipid amount and further mixing an equal amount of chloroform with nitrogen gas blown to dryness. Next, 250 mM ammonium sulfate (pH 8.5) was added and fully hydrated at room temperature for 10 minutes. After hydration, the test tube was sonicated using a water tank type ultrasonic device to prepare liposome 4 composed of EPC / DOTAP / PEG-DSPE / peptide compound 1 (lipid concentration 10 mM). The prepared liposome 4 was subjected to gel filtration using a Sephadex G-50 column equilibrated with 10% sucrose (pH 8.5), and the lipid concentration in the collected fraction was quantified using Phospholipid Test Wako.
- a Dox solution (2 mg / ml) was added to the liposome 4 and incubated at 65 ° C. for 1 hour, and then unencapsulated Dox was removed by gel filtration using a Sephadex G-50 column.
- the amount of Dox encapsulated in liposome 4 was solubilized by Triton-X treatment, and then quantified by measuring the absorbance at 490 nm using a plate reader (infinite M200, TECAN).
- a tumor-bearing hairless mouse formed by transplanting B16-F1 cells subcutaneously was grown to 100 mm 3 in a Dox solution or Dox-encapsulated liposome. 4 was administered via the tail vein 5 days, 8 days, 12 days after transplantation at a Dox concentration of 0.5 mg / kg per administration.
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Abstract
Description
本出願は、2012年10月22日に出願された、日本国特許出願第2012-233011号明細書(その開示全体が参照により本明細書中に援用される)に基づく優先権を主張する。
本発明は、弱酸性pH応答性ペプチド及び該ペプチドを含むリポソームに関する。
(1)親水性アミノ酸ブロックと疎水性アミノ酸ブロックから構成されるペプチド化合物であって、
〔1〕ペプチド化合物の総アミノ酸数は24~36であり、〔2〕親水性アミノ酸ブロックの総アミノ酸数が4~10で、平均疎水性度が-3.0~-1.0であり、〔3〕疎水性アミノ酸ブロックの総アミノ酸数が20~32で、Hisを1個以上有し、平均疎水性度が1.0~2.5である、
ペプチド化合物。
(2)親水性アミノ酸ブロックの平均疎水性度が-2.0~-1.5であり;疎水性アミノ酸ブロックの平均疎水性度が1.5~2.0である(1)記載のペプチド化合物。
(3)親水性アミノ酸ブロックが、疎水性度が-3.0以下であるアミノ酸と疎水性度が0~-1.0であるアミノ酸で構成されたものであり;疎水性アミノ酸ブロックが、Hisと疎水性度が0を超えるアミノ酸で構成されたものである、(1)又は(2)に記載のペプチド化合物。
(4)親水性アミノ酸ブロックを構成するアミノ酸がHis又はGluとGlyで構成されるアミノ酸であり、疎水性アミノ酸ブロックを構成するアミノ酸がHisと、Leu、Ala、Met、Cys、Phe、Val及びIleからなる群から選択される任意のアミノ酸である(1)~(3)のいずれかに記載のペプチド化合物。
(5)親水性アミノ酸ブロックにおけるペプチド配列中にHisを0~5個有し、疎水性アミノ酸ブロックにおけるペプチド配列中にHisを1~8個有することを特徴とする(1)~(4)記載のいずれかにペプチド化合物。
(6)親水性アミノ酸ブロックが、下記式(I)
(AA1)(AA2)(AA3)(AA4) (I)
(式中、AA1、AA2、AA3及びAA4は、いずれか2つがHis又はGluであり、残りの2つがGlyである。)で表され;疎水性アミノ酸ブロックが、下記式(II)で表されるユニットを5~8個含み、各ユニットのアミノ酸配列は同一であっても異なっていてもよい、
(AA5)(AA6)(AA7)(AA8) (II)
(式中、AA5、AA6、AA7及びAA8は、同一又は異なって、His、Leu又はAlaを示す。ただし、式(II)のユニットの少なくとも1つは、Hisを1個又は2個含む。)
(1)~(5)のいずれかに記載のペプチド化合物。
(7) (1)~(6)のいずれかに記載のペプチド化合物と脂質を有することを特徴とするリポソーム。
(8)リポソーム中の総脂質量に対して、(1)~(6)のいずれかに記載のペプチド化合物を1~10モル%含むことを特徴とする(7)記載のリポソーム。
(9)リポソームがカチオン性リポソームである、(8)に記載のリポソーム。
(10)目的物質をリポソームに封入してなる、(7)~(9)のいずれかに記載のリポソーム。
(11)(7)~(10)のいずれかに記載のリポソームを含む医薬組成物。
(12)(7)~(10)のいずれかに記載のリポソームを含む抗腫瘍剤。
(13)哺乳動物に対して(7)~(10)のいずれかに記載のリポソームの癌に対する予防又は治療有効量を投与する工程を含む、癌の予防又は治療方法。
(14)癌の予防又は治療剤を製造するための(7)~(10)のいずれかに記載のリポソームの使用。
(15)癌の予防又は治療に使用するための(7)~(10)のいずれかに記載のリポソーム。
[式中、AA1、AA2、AA3及びAA4は、いずれか2つがHis又はGluであり、残りの2つがGlyである(特に好ましくは、いずれか2つがHisであり、残りの2つがGlyである)。]
本発明ペプチド化合物を構成する疎水性アミノ酸ブロックとしては、平均疎水性度が1.0~2.5、好ましくは1.5~2.0となるようなアミノ酸の組合せであればいずれでもよいが、Hisと疎水性度が0を超えるアミノ酸で構成されたものが好ましく、Hisと、Leu、Ala、Met、Cys、Phe、Val又はIleから選択される任意のアミノ酸で構成されたものがより好ましく、Hisと、α-helix構造を取りやすいアミノ酸であるLeu又はAlaで構成されたものが特に好ましい。また、疎水性アミノ酸ブロックにおけるペプチド配列中にHisを1~8個有するものが好ましい。より具体的には、下記式(II)で表されるユニットを5~8個含み、各ユニットのアミノ酸配列は同一であっても異なっていてもよい、である疎水性アミノ酸ブロックが特に好ましい。
[式中、AA5、AA6、AA7及びAA8は、同一又は異なって、His、Leu又はAlaを示す。ただし、各ユニット間あるいはユニット内の2つのHisは隣接しない。]
本発明ペプチド化合物の特に好ましいものとしては、His-Gly-His-Gly-Leu-Ala-Leu-Leu-Ala-His-Ala-Leu-Leu-Ala-His-Ala-Ala-Leu-Ala-His-Ala-Ala-Leu-Ala(配列番号1)、Gly-His-His-Gly-Leu-Ala-Leu-Leu-His-Ala-Leu-His-Leu-Ala-Ala-Ala-Ala-Leu-His-Ala-Ala-Ala-Leu-Ala(配列番号2)、Glu-Gly-Glu-Gly-Leu-Ala-Leu-Leu-Ala-His-Ala-Leu-Leu-Ala-His-Ala-Ala-Leu-Ala-His-Ala-Ala-Leu-Ala(配列番号3)が挙げられる。
Fmoc-Ala-HMP Resinをスタートとし、0.1mMスケールで、アミノ酸、縮合剤(HBTU/HOBt)、反応促進剤(DIEA)をそれぞれレジンに対して4当量使用してFmoc固相合成法にて配列番号1のペプチドの合成を実施した(HBTU:M.W.379.2、HOBt,Anhydrous:M.W.135.1、DIEA:M.W.129.2)。合成後のレジンにTFA(トリフルオロ酢酸)カクテル溶液(125ml TFA, 0.25ml H2O,0.375gフェノール,0.125mlエタンジチオール及び0.25mlチオアニソール)を加えて氷冷下15分、室温2時間反応させてレジンからペプチドを切出しジエチルエーテル沈殿させてクルードペプチドを得た。HPLCにて精製作業を実施し、凍結乾燥した。純度の検定はHPLC及びMALDI-TOF-MSにて実施した。下記HPLC条件で分析を実施し、単一ピークとして目的のペプチド化合物1(配列番号1)を得た。なお、平均疎水性度は後述する表3に示した。
A Buffer:0.1%TFA/H2O、B Buffer:0.1%TFA/アセトニトリル Column:SunFire C18 Column, 5μm, 4.6x150mm Flow rate:1ml/min,Wavelength:220nm。
HPLC及びMALDI-TOF-MSの結果を図1に示す。
使用したレジン Fmoc-Ala-HMP Resin
使用したレジン量 208.0mg(レジン導入量0.48mmol/g)
このレジンを使用してできるペプチドの理論値 232.3mg。
実際に取れたクルード量 228.6mg(収率98.4%)
実施例1と同様の手法により合成し、ペプチド化合物2(配列番号2)を得た。分子量の計算値:2320.7、実測値:2320.04。HPLC及びMALDI-TOF-MSの結果を図2に示す。なお、平均疎水性度は後述する表3に示した。
使用したレジン Fmoc-Ala-HMP Resin
使用したレジンの量 140.1mg(レジン導入量0.72mmol/g)
このレジンを使用してできるペプチドの理論値 234.0mg
実際に取れたクルード量 95.5mg(収率40.8%)
実施例1と同様の手法により合成し、ペプチド化合物3(配列番号3)を得た。分子量の計算値:2304.6、実測値:2305.14。HPLC及びMALDI-TOF-MSの結果を図3に示す。なお、平均疎水性度は後述する表3に示した。
使用したレジン Fmoc-Ala-HMP Resin
使用したレジンの量 175.6mg(レジン導入量0.60mmol/g)
このレジンを使用してできるペプチドの理論値 242.7mg
実際に取れたクルード量 240.1mg(収率98.9%)
実施例1と同様の手法により合成し、比較化合物1(配列番号4)を得た。分子量の計算値:2320.7、実測値:2320.65。HPLC及びMALDI-TOF-MSの結果を図4に示す。なお、平均疎水性度は後述する表3に示した。
使用したレジン Fmoc-Ala-HMP Resin
使用したレジンの量 179.8mg(レジン導入量0.58mmol/g)
このレジンを使用してできるペプチドの理論値 242.0mg
実際に取れたクルード量 233.4mg(収率96.4%)
実施例1と同様の手法により合成し、比較化合物2(配列番号5)を得た。分子量の計算値:2040.1、実測値:2040.49。HPLC及びMALDI-TOF-MSの結果を図5に示す。なお、平均疎水性度は後述する表3に示した。
使用したレジン H-His(Trt)-Trt(2-Cl)-Resin
使用したレジンの量 217.6mg(レジン導入量0.50mmol/g)
このレジンを使用してできるペプチドの理論値 222.0mg
実際に取れたクルード量 182.9mg(収率82.4%)
実施例1と同様の手法により合成し、比較化合物3(配列番号6)を得た。分子量の計算値:1928.2、実測値:1929.58。HPLC及びMALDI-TOF-MSの結果を図6に示す。なお、平均疎水性度は後述する表3に示した。
使用したレジン Fmoc-Leu-HMP Resin
使用したレジンの量 208.2mg(レジン導入量0.50mmol/g)
このレジンを使用してできるペプチドの理論値 200.7mg
実際に取れたクルード量 111.8mg(収率55.7%)。
(1)リポソームの調製は、卵黄ホスファチジルコリン(EPC)/ジオレオイルテトラアンモニウムプロパン(DOTAP)=1/1(mol比)の割合で混合した脂質エタノール溶液を試験管に分注し、実施例1で得られたペプチド化合物1のエタノール溶液を総脂質量の5mol%量を添加し、さらにクロロフォルムを等量混合したものに、窒素ガスを吹き付けて蒸発乾固させることで脂質薄膜を調製した。pH7.4のbufferを添加し、10分間室温条件で十分に水和させた。水和後、水槽型超音波装置を用いて試験管を超音波処理することでEPC/DOTAP/ペプチド化合物1で構成されたリポソーム1を調製した(脂質濃度10mM)。
(2)異なるpHの緩衝液で希釈懸濁したリポソーム1の粒子径(size)と表面電位(ζpotential)をマルバーン社製ゼータサイザーナノにより測定した。また、ペプチド化合物を導入していないEPC/DOTAP=1/1(mol比)の参考リポソームについても同様に粒子径と表面電位を測定した。結果を表2に示す。
試験例1 異なるpH条件における内封薬物漏出量の測定
(1)実施例4と同様の方法でペプチド含有脂質薄膜を調製後、カルセイン(Mw 622.55)30mM溶液を添加し、実施例4と同様の方法でカルセイン封入リポソーム1を調製した。未封入のカルセインはゲル濾過(Sephadex G50)により除去した。
漏出率(%)=(Fsample-FpH7.4)/(Ftriton-FpH7.4)×100
Fsample:各pH下においてリポソームから漏出したカルセインの蛍光
FpH7.4:pH7.4におけるリポソームから漏出したカルセインの蛍光
Ftriton:当該リポソームに1% Triton-X100を混合した場合のカルセインの蛍光
結果、pH7.4では漏出が全く認められなかったが、pH6.5において約100%のカルセインの漏出が認められた。すなわち、微弱pH変化により、脂質膜に埋め込んだペプチド化合物内の親水性ブロックおよび疎水性ブロックのHisがプロトン化されることにより、ペプチドと脂質分子との間の反発により、内封カルセインが漏出したと示唆された。
実施例1で得られたペプチド化合物1単体及び実施例4に準じて得られたペプチド導入リポソーム(それぞれペプチド濃度にして20μM)を異なるpHのPBS(-)に懸濁し、J-720WI(日本分光(株)社製)を用いてCD(円偏光二色性)スペクトルを測定した。結果を図10に示す。
(1)実施例4と同様の方法に準じて、EPC/ペプチド化合物1=1/5mol%である中性のリポソーム2を調製した。
(2)実施例4と同様の方法に準じて、EPC/DSPG/ペプチド化合物1=1/1/5mol%であるアニオン性のリポソーム3を調製した。
実施例4で得られたリポソーム1、実施例5で得られたリポソーム2、3にそれぞれカルセインを封入し、試験例1と同様の方法でpH応答性を検討した。結果、いずれのリポソームもpH7.4ではカルセインの漏出は認められなかったが、pH6.5においてはカチオン性のリポソーム1が最も良好で、アニオン性のリポソーム3、中性のリポソーム2の順番で漏出が低下した。すなわち、当該リポソームが微弱低pHにおいて応答性示すためには、カチオン性リポソームにペプチド化合物を搭載するのが最も好ましいことが示唆された。
実施例4に記載の方法に準じて、実施例2で得られたペプチド化合物2を導入したリポソーム2を作製し、試験例1と同様の調製方法でカルセイン封入リポソーム2を調製した。
実施例4に記載の方法に準じて、実施例3で得られたペプチド化合物3を導入したリポソーム3を作製し、試験例1と同様の調製方法でカルセイン封入リポソーム3を調製した。
実施例4に記載の方法に準じて、比較例1で得られた比較化合物1を導入した比較リポソーム1を作製し、試験例1と同様の調製方法でカルセイン封入比較リポソーム1を調製した。
実施例4に記載の方法に準じて、比較例2で得られた比較化合物2を導入した比較リポソーム2を作製し、試験例1と同様の調製方法でカルセイン封入比較リポソーム2を調製した。
実施例4に記載の方法に準じて、比較例3で得られた比較化合物3を導入した比較リポソーム3を作製し、試験例1と同様の調製方法でカルセイン封入比較リポソーム3を調製した。
実施例4、6、7及び比較例4~6で得られたそれぞれのカルセイン封入リポソームについて、試験例1と同様の方法でpH7.4及びpH6.5におけるカルセインの漏出率を算出した。結果を表3に示す。
Dox封入リポソーム4は、卵黄ホスファチジルコリン(EPC):ジオレオイルテトラアンモニウムプロパン(DOTAP)=1:1(mol比)の割合で混合した脂質エタノール溶液を試験管に分注し、実施例1で得られたペプチド化合物1のエタノール溶液を総脂質量の5mol%量、さらにポリエチレングリコール-ジステアロイルホスファチジルエタノールアミン (PEG-DSPE)のエタノール溶液を総脂質量の5mol%量添加し、さらにクロロフォルムを等量混合したものに、窒素ガスを吹き付けて蒸発乾固させることで脂質薄膜を調製した。次に、250 mM 硫酸アンモニウム(pH8.5)を添加し、10分間室温条件で十分に水和させた。水和後、水槽型超音波装置を用いて試験管を超音波処理することでEPC/DOTAP/PEG-DSPE/ペプチド化合物1で構成されたリポソーム4を調製した(脂質濃度10 mM)。調製したリポソーム4を10% スクロース (pH 8.5)で平衡化したSephadex G-50カラムを用いてゲル濾過を行い、回収したフラクション中の脂質濃度はリン脂質テストワコーを用いて定量した。このリポソーム4にDox溶液(2mg/ml)を添加し、65℃で1時間インキュベートした後、Sephadex G-50カラムを用いてゲル濾過により、未封入のDoxを除去した。リポソーム4に封入された Dox 量はTriton-X処理により可溶化後、プレートリーダー(infinite M200、TECAN社)を用いて、490 nm における吸光度を測定することにより定量した。
(腫瘍体積)=0.5×(長径) ×(短径)2
また、相対腫瘍体積を、以下の式により算出した。
(相対腫瘍体積)=(移植8、12、15、または19日後の腫瘍体積)/(移植5日後における腫瘍体積)
結果を図11に示す。図11に示すように、低用量 Dox投与において、Dox封入リポソーム4はDox溶液に比べて、高い腫瘍成長抑制効果を示した。
Claims (15)
- 親水性アミノ酸ブロックと疎水性アミノ酸ブロックから構成されるペプチド化合物であって、
〔1〕ペプチド化合物の総アミノ酸数は24~36であり、〔2〕親水性アミノ酸ブロックの総アミノ酸数が4~10で、平均疎水性度が-3.0~-1.0であり、〔3〕疎水性アミノ酸ブロックの総アミノ酸数が20~32で、Hisを1個以上有し、平均疎水性度が1.0~2.5である、
ペプチド化合物。 - 親水性アミノ酸ブロックの平均疎水性度が-2.0~-1.5であり;疎水性アミノ酸ブロックの平均疎水性度が1.5~2.0である請求項1記載のペプチド化合物。
- 親水性アミノ酸ブロックが、疎水性度が-3.0以下であるアミノ酸と疎水性度が0~-1.0であるアミノ酸で構成されたものであり;疎水性アミノ酸ブロックが、Hisと疎水性度が0を超えるアミノ酸で構成されたものである、請求項1に記載のペプチド化合物。
- 親水性アミノ酸ブロックを構成するアミノ酸がHis又はGluとGlyで構成されるアミノ酸であり、疎水性アミノ酸ブロックを構成するアミノ酸がHisと、Leu、Ala、Met、Cys、Phe、Val及びIleからなる群から選択される任意のアミノ酸である請求項1に記載のペプチド化合物。
- 親水性アミノ酸ブロックにおけるペプチド配列中にHisを0~5個有し、疎水性アミノ酸ブロックにおけるペプチド配列中にHisを1~8個有することを特徴とする請求項1にペプチド化合物。
- 親水性アミノ酸ブロックが、下記式(I)
(AA1)(AA2)(AA3)(AA4) (I)
(式中、AA1、AA2、AA3及びAA4は、いずれか2つがHis又はGluであり、残りの2つがGlyである。)で表され;疎水性アミノ酸ブロックが、下記式(II)で表されるユニットを5~8個含み、各ユニットのアミノ酸配列は同一であっても異なっていてもよい、
(AA5)(AA6)(AA7)(AA8) (II)
(式中、AA5、AA6、AA7及びAA8は、同一又は異なって、His、Leu又はAlaを示す。ただし、式(II)のユニットの少なくとも1つは、Hisを1個又は2個含む。)
請求項1に記載のペプチド化合物。 - 請求項1~6のいずれかに記載のペプチド化合物と脂質を有することを特徴とするリポソーム。
- リポソーム中の総脂質量に対して、請求項1~6のいずれかに記載のペプチド化合物を1~10モル%含むことを特徴とする請求項7記載のリポソーム。
- リポソームがカチオン性リポソームである、請求項8に記載のリポソーム。
- 目的物質をリポソームに封入してなる、請求項7に記載のリポソーム。
- 請求項7~10のいずれかに記載のリポソームを含む医薬組成物。
- 請求項7~10のいずれかに記載のリポソームを含む抗腫瘍剤。
- 哺乳動物に対して請求項7~10のいずれかに記載のリポソームの癌に対する予防又は治療有効量を投与する工程を含む、癌の予防又は治療方法。
- 癌の予防又は治療剤を製造するための請求項7~10のいずれかに記載のリポソームの使用。
- 癌の予防又は治療に使用するための請求項7~10のいずれかに記載のリポソーム。
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US14/430,723 US9526791B2 (en) | 2012-10-22 | 2013-10-21 | Weakly acidic pH-responsive peptide and liposome containing same |
CN201380055158.2A CN104755490B (zh) | 2012-10-22 | 2013-10-21 | 弱酸性pH响应性肽和含有其的脂质体 |
KR1020157013081A KR101678327B1 (ko) | 2012-10-22 | 2013-10-21 | 약산성 pH 응답성 펩티드 및 상기 펩티드를 포함하는 리포솜 |
JP2014543288A JP5931212B2 (ja) | 2012-10-22 | 2013-10-21 | 弱酸性pH応答性ペプチド及び該ペプチドを含むリポソーム |
ES13848530.5T ES2627056T3 (es) | 2012-10-22 | 2013-10-21 | Péptido sensible a pH débilmente ácido y liposoma que contiene el mismo |
EP13848530.5A EP2910564B1 (en) | 2012-10-22 | 2013-10-21 | Weakly acidic ph-responsive peptide and liposome containing same |
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WO2017046416A1 (en) | 2015-09-18 | 2017-03-23 | Technische Universität München | LIGANDS FOR INTEGRIN AVß6, SYNTHESIS AND USES THEREOF |
KR101730399B1 (ko) | 2015-04-13 | 2017-04-27 | 영남대학교 산학협력단 | 악시티닙을 포함하는 약물 전달체 및 이의 제조방법 |
WO2018167295A1 (en) | 2017-03-17 | 2018-09-20 | Technische Universität München | LIGANDS FOR INTEGRIN αvβ8, SYNTHESIS AND USES THEREOF |
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EP2910564A1 (en) | 2015-08-26 |
KR101678327B1 (ko) | 2016-11-21 |
KR20150070378A (ko) | 2015-06-24 |
EP2910564B1 (en) | 2017-03-22 |
US9526791B2 (en) | 2016-12-27 |
EP2910564A4 (en) | 2016-03-30 |
JP5931212B2 (ja) | 2016-06-08 |
JPWO2014065245A1 (ja) | 2016-09-08 |
CN104755490A (zh) | 2015-07-01 |
CN104755490B (zh) | 2018-05-15 |
US20150250893A1 (en) | 2015-09-10 |
ES2627056T3 (es) | 2017-07-26 |
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