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Journal of Experimental Medicine, Vol 167, 1472-1478, Copyright © 1988 by Rockefeller University Press
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GE Ranges, A Zlotnik, T Espevik, CA Dinarello, A Cerami and MA Palladino Jr
Department of Molecular Biology and Immunology, Genentech, Inc., South San Francisco, California 94080.
Recombinant murine (rm) TNF-alpha but not recombinant human (rh) TNF- alpha induces the proliferation of murine thymocytes in the presence of a comitogenic stimulus. This effect does not appear to be due to the production of significant levels of IL-1, IL-2, or IL-4. although not directly mitogenic (i.e., in the absence of PHA-P) for thymocytes, rmTNF-alpha amplifies the direct mitogenic signals from hIL-1 and rhIL- 2 but not rmIL-4. In the presence of PHA-P, thymocytes stimulated with hIL-1, rhIL-2, and rmIL-4 produced significant amounts of TNF-alpha. Although rhTNF-alpha does not induce a proliferative response, it will competitively inhibit the proliferative response of thymocytes to rmTNF- alpha. These data suggest a critical role for TNF-alpha in the intrathymic proliferation of developing T cells.
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