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Loss Of CTLA-4 Leads To Massive Lymphoproliferation And Fatal Multiorgan Tissue Destruction, Revealing A Critical Negative Regulatory Role Of CTLA-4.

E. Tivol, F. Borriello, A. Schweitzer, W. P. Lynch, J. Bluestone, A. Sharpe
Published 1995 · Biology, Medicine

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The B7-CD28/CTLA-4 costimulatory pathway can provide a signal pivotal for T cell activation. Signaling through this pathway is complex due to the presence of two B7 family members, B7-1 and B7-2, and two counterreceptors, CD28 and CTLA-4. Studies with anti-CTLA-4 monoclonal antibodies have suggested both positive and negative roles for CTLA-4 in T cell activation. To elucidate the in vivo function of CTLA-4, we generated CTLA-4-deficient mice. These mice rapidly develop lymphoproliferative disease with multiorgan lymphocytic infiltration and tissue destruction, with particularly severe myocarditis and pancreatitis, and die by 3-4 weeks of age. The phenotype of the CTLA-4-deficient mouse strain is supported by studies that have suggested a negative role for CTLA-4 in T cell activation. The severe phenotype of mice lacking CTLA-4 implies a critical role for CTLA-4 in down-regulating T cell activation and maintaining immunologic homeostasis. In the absence of CTLA-4, peripheral T cells are activated, can spontaneously proliferate, and may mediate lethal tissue injury.
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