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The Journal of Immunology, Vol 157, Issue 5 1935-1943, Copyright © 1996 by American Association of Immunologists
ARTICLES |
F Novelli, P Bernabei, L Ozmen, L Rigamonti, A Allione, S Pestka, G Garotta and G Forni
Department of Clinical and Biological Sciences, University of Turin, Orbassano, Italy.
To find out how physiologically secreted IFN-gamma controls either the proliferation or the apoptosis of human T lymphocytes, the kinetics of expression of the alpha- and beta-chains of its receptor (IFN-gamma R) were sequentially followed on T lymphocytes first activated with PHA and then cultured in the presence of IL-2, and related to the kinetics of expression of Fas, Bcl-2, and IL-2R p55 chain. Both IFN-gamma R chains were poorly expressed on the membrane of resting T lymphocytes. Following their stimulation with PHA, IFN-gamma R alpha but not IFN gamma R beta-chain up-modulated before T lymphocyte entry into the S phase, and then IFN-gamma R alpha down-modulated when they passed through the S and G2/M. The ensuing proliferative response was inhibited by an anti-IFN-gamma R alpha mAb that impeded the binding of IFN-gamma. When PHA-activated T lymphoblasts were cultured for 16 days with IL-2, IFN-gamma R alpha expression increased, whereas that of the beta-chain remained barely detectable. Fas and Bcl-2 were both highly expressed. When these T lymphoblasts were restimulated by PHA, OKT3, or Staphylococcus enterotoxin beta-pokeweed mitogen, both chains up- modulated and most cells underwent apoptosis in a way apparently independent of Bcl-2, but not of Fas. This apoptosis, too, was prevented by the anti-IFN-gamma R alpha mAb. Physiologically secreted IFN-gamma is thus involved in the activation of resting T lymphocytes and in the apoptosis of reactivated lymphoblasts. However, high expression of IFN-gamma R beta took place when IFN-gamma induced apoptosis, but not when it induced proliferation. In conclusion, a correlation exists between differential expression of the IFN-gamma R beta-chain and the delivery by IFN-gamma of proliferative or apoptotic signals.
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