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The Journal of Immunology, Vol 156, Issue 11 4160-4166, Copyright © 1996 by American Association of Immunologists

ARTICLES

Modulation of the expression of the IFN-gamma receptor beta-chain controls responsiveness to IFN-gamma in human peripheral blood T cells

M Sakatsume and DS Finbloom
Food and Drug Administration, Center for Biologics Research and Evaluation, Division of Cytokine Biology, Bethesda, MD 20892, USA.

IFN-gamma has potent antiproliferative and apoptotic effects in T cells that are important in determining T cell development and polarized differentiation. Therefore, any event that enables T cells to become less responsive to IFN- gamma may potentially alter immune responsiveness to Ag. In this work, we show that human peripheral blood T cells that are stimulated through the TCR and expanded with IL-2 are unresponsive to IFN-gamma, as determined by a lack of activation of jak kinases and the transcription factor, STAT1(alpha), a signal transducer and activator of transcription. This nonresponsiveness occurs because of a lack of expression of the beta- chain (accessory factor) of the IFN-gamma receptor, while at the same time maintaining IFN-gamma receptor alpha-chain expression. Expression of the beta-chain can be restored by secondary TCR ligation or PMA treatment. T cell blasts treated with PMA are now responsive to IFN-gamma. When freshly isolated, highly enriched (>98%) T cells are examined for IFN-gamma responsiveness; these cells can respond to IFN-gamma and express beta- chain. Therefore, as T cells progress from primary TCR activation through IL-2-dependent proliferation, followed by secondary TCR stimulation, their responsiveness to IFN-gamma varies, and this may affect their ability to participate in an ongoing immune response.


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