Journal
JOURNAL OF AUTOIMMUNITY
Volume 21, Issue 3, Pages 255-260Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/S0896-8411(03)00119-7
Keywords
costimulation; T cells; experimental autoimmune encephalomyelitis; collagen-induced arthritis; IL-17
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Proper T cell activation and function are regulated by the innate immune system, importantly through positive and negative costimulatory molecules in the B7 superfamily. Inducible costimulator (ICOS), the receptor for B7h (also known as B7RP-1), is expressed on T cells after T cell activation. Recently, using ICOS-deficient mice, we have examined the roles of ICOS in immune responses. ICOS is required for Immoral immunity. In organ-specific autoimmune responses, however, ICOS has contrast roles in different disease models. On the one hand, ICOS-/- mice exhibited extreme sensitivity to experimental autoimmune encephalomyelitis (EAE): on the other. ICOS gene deletion led to complete resistance to collagen-induced arthritis (CIA) in mice. Our work not only illustrates the complexity of immune regulation by costimulatory molecules, but also suggests novel therapeutic strategies for various autoimmune diseases. (C) 2003 Elsevier Ltd. All rights reserved.
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