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DE69941113D1 - Zytokinen und mitogenen um "graft-versus-host disease" zu verhindern - Google Patents

Zytokinen und mitogenen um "graft-versus-host disease" zu verhindern

Info

Publication number
DE69941113D1
DE69941113D1 DE69941113T DE69941113T DE69941113D1 DE 69941113 D1 DE69941113 D1 DE 69941113D1 DE 69941113 T DE69941113 T DE 69941113T DE 69941113 T DE69941113 T DE 69941113T DE 69941113 D1 DE69941113 D1 DE 69941113D1
Authority
DE
Germany
Prior art keywords
mitogenes
cytokines
graft
versus
prevent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
DE69941113T
Other languages
English (en)
Inventor
David A Horwitz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
University of Southern California USC
Original Assignee
University of Southern California USC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by University of Southern California USC filed Critical University of Southern California USC
Application granted granted Critical
Publication of DE69941113D1 publication Critical patent/DE69941113D1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12NMICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N5/00Undifferentiated human, animal or plant cells, e.g. cell lines; Tissues; Cultivation or maintenance thereof; Culture media therefor
    • C12N5/06Animal cells or tissues; Human cells or tissues
    • C12N5/0602Vertebrate cells
    • C12N5/0634Cells from the blood or the immune system
    • C12N5/0636T lymphocytes
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00Medicinal preparations containing antigens or antibodies
    • A61K39/0005Vertebrate antigens
    • A61K39/001Preparations to induce tolerance to non-self, e.g. prior to transplantation
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K40/00Cellular immunotherapy
    • A61K40/10Cellular immunotherapy characterised by the cell type used
    • A61K40/11T-cells, e.g. tumour infiltrating lymphocytes [TIL] or regulatory T [Treg] cells; Lymphokine-activated killer [LAK] cells
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K40/00Cellular immunotherapy
    • A61K40/20Cellular immunotherapy characterised by the effect or the function of the cells
    • A61K40/22Immunosuppressive or immunotolerising
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K40/00Cellular immunotherapy
    • A61K40/40Cellular immunotherapy characterised by antigens that are targeted or presented by cells of the immune system
    • A61K40/41Vertebrate antigens
    • A61K40/418Antigens related to induction of tolerance to non-self
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K40/00Cellular immunotherapy
    • A61K40/40Cellular immunotherapy characterised by antigens that are targeted or presented by cells of the immune system
    • A61K40/41Vertebrate antigens
    • A61K40/42Cancer antigens
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P37/00Drugs for immunological or allergic disorders
    • A61P37/02Immunomodulators
    • A61P37/06Immunosuppressants, e.g. drugs for graft rejection
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K35/00Medicinal preparations containing materials or reaction products thereof with undetermined constitution
    • A61K35/12Materials from mammals; Compositions comprising non-specified tissues or cells; Compositions comprising non-embryonic stem cells; Genetically modified cells
    • A61K2035/122Materials from mammals; Compositions comprising non-specified tissues or cells; Compositions comprising non-embryonic stem cells; Genetically modified cells for inducing tolerance or supression of immune responses
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K35/00Medicinal preparations containing materials or reaction products thereof with undetermined constitution
    • A61K35/12Materials from mammals; Compositions comprising non-specified tissues or cells; Compositions comprising non-embryonic stem cells; Genetically modified cells
    • A61K2035/124Materials from mammals; Compositions comprising non-specified tissues or cells; Compositions comprising non-embryonic stem cells; Genetically modified cells the cells being hematopoietic, bone marrow derived or blood cells
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K2239/00Indexing codes associated with cellular immunotherapy of group A61K40/00
    • A61K2239/46Indexing codes associated with cellular immunotherapy of group A61K40/00 characterised by the cancer treated
    • A61K2239/48Blood cells, e.g. leukemia or lymphoma
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12NMICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N2501/00Active agents used in cell culture processes, e.g. differentation
    • C12N2501/10Growth factors
    • C12N2501/15Transforming growth factor beta (TGF-β)
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12NMICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N2501/00Active agents used in cell culture processes, e.g. differentation
    • C12N2501/20Cytokines; Chemokines
    • C12N2501/23Interleukins [IL]
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12NMICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N2501/00Active agents used in cell culture processes, e.g. differentation
    • C12N2501/50Cell markers; Cell surface determinants
    • C12N2501/59Lectins
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12NMICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N2501/00Active agents used in cell culture processes, e.g. differentation
    • C12N2501/50Cell markers; Cell surface determinants
    • C12N2501/599Cell markers; Cell surface determinants with CD designations not provided for elsewhere
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S435/00Chemistry: molecular biology and microbiology
    • Y10S435/81Packaged device or kit

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Animal Behavior & Ethology (AREA)
  • Engineering & Computer Science (AREA)
  • Epidemiology (AREA)
  • Immunology (AREA)
  • Chemical & Material Sciences (AREA)
  • Biomedical Technology (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • Organic Chemistry (AREA)
  • Zoology (AREA)
  • Biotechnology (AREA)
  • Wood Science & Technology (AREA)
  • Genetics & Genomics (AREA)
  • Microbiology (AREA)
  • Pharmacology & Pharmacy (AREA)
  • Transplantation (AREA)
  • Medicinal Chemistry (AREA)
  • Hematology (AREA)
  • Mycology (AREA)
  • Cell Biology (AREA)
  • Biochemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Micro-Organisms Or Cultivation Processes Thereof (AREA)
DE69941113T 1998-03-03 1999-03-03 Zytokinen und mitogenen um "graft-versus-host disease" zu verhindern Expired - Lifetime DE69941113D1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US7667798P 1998-03-03 1998-03-03
PCT/US1999/004630 WO1999048524A1 (en) 1998-03-03 1999-03-03 Use of cytokines and mitogens to inhibit graft versus host disease

Publications (1)

Publication Number Publication Date
DE69941113D1 true DE69941113D1 (de) 2009-08-27

Family

ID=22133546

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69941113T Expired - Lifetime DE69941113D1 (de) 1998-03-03 1999-03-03 Zytokinen und mitogenen um "graft-versus-host disease" zu verhindern

Country Status (5)

Country Link
US (3) US6447765B1 (de)
EP (1) EP1061949B1 (de)
AU (1) AU3066599A (de)
DE (1) DE69941113D1 (de)
WO (1) WO1999048524A1 (de)

Families Citing this family (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010055581A1 (en) 1994-03-18 2001-12-27 Lawrence Tamarkin Composition and method for delivery of biologically-active factors
US20030157057A1 (en) * 1999-05-05 2003-08-21 Horwitz David A. Methods for the induction of professional and cytokine-producing regulatory T cells
US6358506B1 (en) 1997-11-05 2002-03-19 University Of Southern California Use of cytokines and mitogens to inhibit pathological immune responses
US7229841B2 (en) * 2001-04-30 2007-06-12 Cytimmune Sciences, Inc. Colloidal metal compositions and methods
US6407218B1 (en) * 1997-11-10 2002-06-18 Cytimmune Sciences, Inc. Method and compositions for enhancing immune response and for the production of in vitro mabs
US6803036B1 (en) 1998-03-03 2004-10-12 University Of Southern California Use of cytokines, cells and mitogens to inhibit graft versus host disease
US6447765B1 (en) 1998-03-03 2002-09-10 University Of Southern California Use of cytokines and mitogens to inhibit graft versus host disease
US7083777B1 (en) * 1999-04-02 2006-08-01 The Brigham And Women's Hospital, Inc. Immunomodulating polymers
CA2384418C (en) * 1999-09-01 2008-07-22 University Of Southern California Use of cytokines, cells, and mitogens to inhibit graft versus host disease
US7541184B2 (en) 2000-02-24 2009-06-02 Invitrogen Corporation Activation and expansion of cells
US7572631B2 (en) 2000-02-24 2009-08-11 Invitrogen Corporation Activation and expansion of T cells
JP5008810B2 (ja) * 2000-04-11 2012-08-22 ユニバーシティ オブ サザン カリフォルニア 抑制性T細胞を誘導するためにTGF−βを用いる移植拒絶反応を防止する方法
SV2003000753A (es) 2000-12-05 2003-06-16 Brigham & Womens Hospital Uso de polisacaridos zwitterionicos para la especifica modulacion del progreso inmunologico
US20030031652A1 (en) * 2001-04-16 2003-02-13 Bernhard Hering Systems and methods for inducing mixed chimerism
US20040005315A1 (en) * 2002-05-22 2004-01-08 Siemionow Maria Z. Induction and maintenance of tolerance to composite tissue allografts
US20050058641A1 (en) * 2002-05-22 2005-03-17 Siemionow Maria Z. Tolerance induction and maintenance in hematopoietic stem cell allografts
US20040219160A1 (en) * 2003-03-31 2004-11-04 The Brigham And Women's Hospital, Inc. Zwitterionic immunomodulators for the treatment of asthma and allergy
JP4865540B2 (ja) 2003-04-08 2012-02-01 イエダ リサーチ アンド ディベロップメント カンパニー リミテッド 化学誘引物質に対する増大された感受性を有する幹細胞およびそれを産生および使用する方法
FR2853551B1 (fr) 2003-04-09 2006-08-04 Lab Francais Du Fractionnement Formulation stabilisante pour compositions d'immunoglobulines g sous forme liquide et sous forme lyophilisee
IL158868A0 (en) * 2003-11-13 2004-05-12 Yeda Res & Dev Methods of generating and using stem cells enriched with immature primitive progenitor
US20050175583A1 (en) * 2003-12-02 2005-08-11 Lawrence Tamarkin Methods and compositions for the production of monoclonal antibodies
US7884196B2 (en) * 2004-10-06 2011-02-08 Oliver Lawless Vaccine composition comprising methylated DNA and immunomodulatory motifs
WO2007092451A2 (en) 2006-02-06 2007-08-16 The Brigham And Women's Hospital, Inc. Zwitterionic polysaccharides for promotion of immune system maturation and health
US20110014118A1 (en) * 2007-09-21 2011-01-20 Lawrence Tamarkin Nanotherapeutic colloidal metal compositions and methods
CA2700378A1 (en) * 2007-09-21 2009-03-29 Cytimmune Sciences, Inc. Nanotherapeutic colloidal metal compositions and methods
US7960145B2 (en) * 2007-11-08 2011-06-14 Cytimmune Sciences, Inc. Compositions and methods for generating antibodies
CN102281761A (zh) * 2009-01-14 2011-12-14 健康研究股份有限公司 用于增强免疫应答的方法和含有mTOR抑制剂的组合物
CN102971416B (zh) 2010-04-22 2018-03-30 南加州大学 用于扩增和稳定天然调节性t细胞的方法和组合物
WO2013009945A1 (en) 2011-07-12 2013-01-17 The Brigham And Women's Hospital, Inc. Lipid-containing psa compositions, methods of isolation and methods of use thereof
SG11201400513PA (en) 2011-09-08 2014-06-27 Yeda Res & Dev Anti third party central memory t cells, methods of producing same and use of same in transplantation and disease treatment
US20150110738A1 (en) 2012-05-04 2015-04-23 University Of Southern California Methods and compositions for generating and using allogeneic suppressor cells
US9868939B2 (en) 2013-06-12 2018-01-16 Wisconsin Alumni Research Foundation Generating vasculogenic cell populations
US10092597B2 (en) * 2014-01-14 2018-10-09 The University Of Hong Kong Human CD8+ regulatory T cells inhibit GVHD and preserve general immunity in humanized mice
JP6691921B2 (ja) 2015-02-20 2020-05-13 ウィスコンシン アラムニ リサーチ ファンデーション 動脈内皮細胞集団の生成
AU2016291825B2 (en) 2015-07-16 2022-08-11 Yeda Research And Development Co. Ltd. Genetically modified anti-third party central memory T cells and use of same in immunotherapy
JP6918365B2 (ja) 2015-08-19 2021-08-11 プレジデント アンド フェローズ オブ ハーバード カレッジ 脂質化psa組成物および方法
US11491181B2 (en) 2016-07-15 2022-11-08 President And Fellows Of Harvard College Glycolipid compositions and methods of use
CN110392736A (zh) 2017-01-18 2019-10-29 耶达研究及发展有限公司 遗传修饰的反抑细胞及其在免疫治疗中的用途
US10751368B2 (en) 2017-01-18 2020-08-25 Yeda Research And Development Co. Ltd. Methods of transplantation and disease treatment
JP2021535747A (ja) 2018-09-07 2021-12-23 ウィスコンシン アラムニ リサーチ ファンデーション ヒト多能性幹細胞からの造血前駆細胞の生成
US20220096602A1 (en) * 2019-02-27 2022-03-31 Rutgers, The State University Of New Jersey Lif therapy for inducing intestinal epithelial cell regeneration
EP4482469A1 (de) * 2022-02-24 2025-01-01 Mayo Foundation for Medical Education and Research Zusammensetzungen und verfahren zur modulation des immunsystems

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US34500A (en) * 1862-02-25 Nestor houghton
US5658894A (en) * 1989-04-23 1997-08-19 The Trustees Of The University Of Pennsylvania Compositions for inhibiting restenosis
US6406696B1 (en) 1989-10-27 2002-06-18 Tolerance Therapeutics, Inc. Methods of stimulating the immune system with anti-CD3 antibodies
US5374549A (en) 1991-01-31 1994-12-20 Terumo Corporation Process of enriching adherent CD4+ T cells from monocyte depleted peripheral blood mononuclear cells with interleukin 2 and interleukin 4
FR2677654B1 (fr) * 1991-06-17 1995-11-17 Pasteur Merieux Serums Vacc Composes a effet immunogene anti-cytokine, a effet immunogene anticytostatique ou a effet vaccinal anti-infection a hiv.
US6277635B1 (en) * 1992-03-04 2001-08-21 Schering Corporation Use of interleukin-10 to produce a population of suppressor cells
IL104916A0 (en) * 1992-03-04 1993-07-08 Schering Corp Use of interleukin-10 to suppress graft-vs.-host disease
US5228359A (en) * 1992-05-18 1993-07-20 Chrysler Corporation Steering column bracket assembly
US6228359B1 (en) 1997-11-05 2001-05-08 University Of Southern California Use of cytokines and mitogens to inhibit pathological immune responses
US6358506B1 (en) 1997-11-05 2002-03-19 University Of Southern California Use of cytokines and mitogens to inhibit pathological immune responses
US6447765B1 (en) 1998-03-03 2002-09-10 University Of Southern California Use of cytokines and mitogens to inhibit graft versus host disease
ATE332963T1 (de) 1999-01-22 2006-08-15 Schepens Eye Res Inst Aktivierung von regulatorischen t zellen durch ein alpha-melanocyten stimulierendes hormon
JP4132013B2 (ja) 1999-05-05 2008-08-13 ユニバーシティ オブ サザン カリフォルニア 病的免疫応答を抑制するサイトカインおよびマイトジェンの使用
WO2001016298A1 (en) 1999-08-31 2001-03-08 Smithkline Beecham Corporation Cloning of mouse gpr10 receptor
CA2384418C (en) 1999-09-01 2008-07-22 University Of Southern California Use of cytokines, cells, and mitogens to inhibit graft versus host disease
JP5008810B2 (ja) 2000-04-11 2012-08-22 ユニバーシティ オブ サザン カリフォルニア 抑制性T細胞を誘導するためにTGF−βを用いる移植拒絶反応を防止する方法
US6746670B2 (en) 2000-08-15 2004-06-08 Schering Corporation Regulatory T cells; methods
EP1241249A1 (de) 2001-03-12 2002-09-18 Gerold Schuler Regulatorische CD4+CD25+ T Zellen aus menschlichem Blut
FR2824567B1 (fr) 2001-05-11 2003-08-08 Inst Nat Sante Rech Med Procede d'obtention de lymphocytes tr1 regulateurs specifiques d'antigene

Also Published As

Publication number Publication date
US7799350B2 (en) 2010-09-21
US7381563B2 (en) 2008-06-03
WO1999048524A1 (en) 1999-09-30
EP1061949A1 (de) 2000-12-27
EP1061949B1 (de) 2009-07-15
AU3066599A (en) 1999-10-18
US20090061514A1 (en) 2009-03-05
US20030012791A1 (en) 2003-01-16
US6447765B1 (en) 2002-09-10

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