alexa B7-H1, a third member of the B7 family, co-stimulates T-cell proliferation and interleukin-10 secretion.
Immunology

Immunology

Journal of Clinical & Cellular Immunology

Author(s): Dong H, Zhu G, Tamada K, Chen L

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Abstract The B7 family members B7-1 and B7-2 interact with CD28 and constitute an essential T-cell co-stimulatory pathway in the initiation of antigen-specific humoral and cell-mediated immune response. Here, we describe a third member of the B7 family, called B7-H1 that does not bind CD28, cytotoxic T-lymphocyte A4 or ICOS (inducible co-stimulator). Ligation of B7-H1 co-stimulated T-cell responses to polyclonal stimuli and allogeneic antigens, and preferentially stimulated the production of interleukin-10. Interleukin-2, although produced in small amounts, was required for the effect of B7-H1 co-stimulation. Our studies thus define a previously unknown co-stimulatory molecule that may be involved in the negative regulation of cell-mediated immune responses. This article was published in Nat Med and referenced in Journal of Clinical & Cellular Immunology

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