alexa Lymphoproliferative disorders with early lethality in mice deficient in Ctla-4.
Immunology

Immunology

Journal of Clinical & Cellular Immunology

Author(s): Waterhouse P, Penninger JM, Timms E, Wakeham A, Shahinian A,

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Abstract The role of the cell-surface molecule CTLA-4 in the regulation of T cell activation has been controversial. Here, lymph nodes and spleens of CTLA-4-deficient mice accumulated T cell blasts with up-regulated activation markers. These blast cells also infiltrated liver, heart, lung, and pancreas tissue, and amounts of serum immunoglobulin were elevated. The mice invariably became moribund by 3 to 4 weeks of age. Although CTLA-4-deficient T cells proliferated spontaneously and strongly when stimulated through the T cell receptor, they were sensitive to cell death induced by cross-linking of the Fas receptor and by gamma irradiation. Thus, CTLA-4 acts as a negative regulator of T cell activation and is vital for the control of lymphocyte homeostasis.
This article was published in Science and referenced in Journal of Clinical & Cellular Immunology

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