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. 1993 Dec 1;90(23):11059–11063. doi: 10.1073/pnas.90.23.11059

Activated human B lymphocytes express three CTLA-4 counterreceptors that costimulate T-cell activation.

V A Boussiotis 1, G J Freeman 1, J G Gribben 1, J Daley 1, G Gray 1, L M Nadler 1
PMCID: PMC47921  PMID: 7504293

Abstract

Signaling via the T-cell receptor complex is necessary but not sufficient to induce antigen-specific T lymphocytes to expand clonally. To proliferate, T cells must receive one or more costimulatory signals provided by antigen presenting cells (APCs). One such critical costimulatory signal is delivered by the CD28/CTLA-4 counterreceptor, B7, expressed on APCs. B7 costimulation induces CD28 signaling, resulting in interleukin 2 (IL-2) secretion, and T-cell proliferation. Conversely, T-cell receptor signaling in the absence of B7 costimulation results in induction of antigen-specific tolerance. Here, we show that activated human B lymphocytes express two additional CTLA-4 counterreceptors also capable of providing T-cell costimulation. At 24 hr postactivation, B cells express a CTLA-4 counterreceptor not recognized by anti-B7 or -BB-1 monoclonal antibodies (mAbs), which induces detectable IL-2 secretion and T-cell proliferation. At 48 and 72 hr postactivation, B cells express both B7 and a third CTLA-4 counterreceptor identified by the anti-BB-1 mAb. BB-1 appears to be a molecule distinct from B7 by its expression on B7- cells and its capacity to induce T cells to proliferate without significant accumulation of IL-2. As observed for B7, costimulatory signals mediated by these alternative CTLA-4/CD28 counterreceptors are likely to be essential for generation of an immune response and their absence may result in antigen-specific tolerance. We propose the following terminology for these CTLA-4 counterreceptors: (i) B7, B7-1; (ii) early CTLA-4 binding counterreceptor, B7-2; and (iii) BB-1, B7-3.

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Selected References

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