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The Journal of Immunology, Vol 131, Issue 3 1049-1055, Copyright © 1983 by American Association of Immunologists
ARTICLES |
TT Hecht, DL Longo and LA Matis
The release of immune or gamma interferon (IFN-gamma) by major histocompatibility complex (MHC)-restricted pigeon cytochrome c- specific Lyt 1+2-, interleukin 2 (IL 2)-producing proliferative T cell clones when cultured with antigen and antigen-presenting cells (APC) is a sensitive measure of the state of activation of the cell. In general, the fine specificity of T cell activation was similar when activation was measured either by IFN-gamma production or by proliferation. In response to antigen and the correct Ia molecule, the T cell clones produced both high titered IFN-gamma and a strong proliferative response. However, IFN-gamma production and the degree of proliferation of the T cell clones differed at high antigen concentrations. As antigen concentration increased, the magnitude of proliferation became submaximal whereas the IFN-gamma response became maximal suggesting that IFN-gamma produced by the cells might act as an autoregulatory molecule inhibiting the proliferative response. Stimulating the T cell to divide via its IL 2 receptor by adding exogenous IL 2 produced high levels of proliferation but only low titers of IFN-gamma activity. In addition, irradiation of the clone eliminated the IFN-gamma release induced by IL 2 but did not affect the IFN-gamma release induced by antigen and Ia. Thus proliferation is not essential for IFN-gamma production and unlike antigen and Ia, IL 2 functions predominantly as a proliferative signal and not as a signal for factor release. Two T cell clones showed a dissociation of IFN-gamma production and proliferation. In one case, a clone that proliferated in response to both allogeneic and antigenic stimuli released IFN-gamma in response to antigen but failed to produce IFN-gamma in response to the allogeneic stimulus. A second clone that showed a strong proliferative response to pigeon cytochrome c but no proliferative response to a species variant of cytochrome c, tobacco hornworm moth (THWM) cytochrome c, produced IFN- gamma when stimulated with either of these antigens. Thus, the sensitivity of detecting activation of T cell clones as measured by the release of an individual lymphokine varies from one clone to another.
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