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The Journal of Immunology, Vol 146, Issue 2 560-564, Copyright © 1991 by American Association of Immunologists
ARTICLES |
C Cerdan, Y Martin, H Brailly, M Courcoul, S Flavetta, R Costello, C Mawas, F Birg and D Olive
Unite 119 de l'INSERM, 27, Marseille, France.
In addition to activation via the TCR complex, resting purified T cells can be activated to proliferate by mAb directed against the two surface molecules, CD2 and CD28. We demonstrate here that only the CD2 plus CD28 combined activation induces the expression and secretion of IL-1 alpha, a cytokine classically considered as a monokine. In contrast, neither IL-1 beta nor IL-6 were produced. A second monokine, TNF-alpha was transiently expressed by T cells activated with either CD2 or CD28 mAb, but was expressed to higher levels and with a prolonged kinetics in cells activated by the CD2 plus CD28 combination. The prolonged expression of the IL-1 alpha gene could account, at least in part, for the monocyte-independent and long lasting T cell proliferation induced by the CD2 plus CD28 co-stimulation. Secretion of monokines, such as IL- 1 alpha, by activated T cells, could play a regulatory role in immune responses, as well as contribute to autoimmune processes.
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