NDLI: Regulation of T cell response by blocking the ICOS signal with the B7RP-1-specific small antibody fragment isolated from human antibody phage library

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Regulation of T cell response by blocking the ICOS signal with the B7RP-1-specific small antibody fragment isolated from human antibody phage library

Content Provider	PubMed Central
Author	Maeda, Masatoshi Ito, Yuji Hatanaka, Takaaki Hashiguchi, Shuhei Torikai, Masaharu Nakashima, Toshihiro Sugimura, Kazuhisa
Copyright Year	2009
Abstract	A costimulatory signal is required for the full activation of T cells, in addition to the antigen-specific signal via the T cell receptor. The inducible costimulator, ICOS is one of the costimulatory molecules that play an essential role in this process, particularly in the expansion or the development of effector T cells. As blocking of the interaction between ICOS and its ligand, B7RP-1, suppresses the T cell response, it can be applied to the treatment of allograft rejection or autoimmune diseases. Here, we isolated four scFv clones that were specific to human B7RP-1 by biopanning a human antibody phage library. We found that three of these clones inhibited the interaction between ICOS-Fc and B7RP-1-Fc. These inhibitory clones not only recognized B7RP-1 molecules expressed on B cells, as assessed by FACS, but also exhibited inhibitory activity in a proliferation assay of T cells stimulated with anti-CD3 mAb and B7RP-1-Fc. Finally, the suppression effect of the scFv on the allogenic immune response was examined using a mixed lymphocyte reaction assay, which demonstrated a successful inhibition of the allogenic reaction, in spite of the high dose needed for complete inhibition (360 nM).
Starting Page	453
File Format	PDF
ISSN	19420870
e-ISSN	19420870
Journal	mAbs
Issue Number	5
Volume Number	1
Language	English
Publisher	Landes Bioscience
Publisher Date	2009-01-01
Access Restriction	Open
Rights Holder	Landes Bioscience
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Immunology and Allergy Immunology

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