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Antigen-induced human interferon-gamma production. Differential dependence on interleukin 2 and its receptor.

C D Kelly, K Welte and H W Murray
J Immunol October 1, 1987, 139 (7) 2325-2328;
C D Kelly
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K Welte
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H W Murray
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Abstract

Once stimulated with Toxoplasma gondii or cytomegalovirus (CMV) antigens, peripheral blood mononuclear cells from healthy seropositive donors secrete comparable levels of interferon-gamma (IFN-gamma). Both antigens also stimulated specific production of interleukin 2 (IL-2), a lymphokine believed to be important in IFN-gamma generation. T. gondii antigen, however, induced ninefold more IL-2 than did CMV antigen suggesting different mechanisms for antigen-stimulated IFN-gamma production. Therefore, we examined for both antigens 1) the cellular sources of IL-2 and IFN-gamma, 2) the kinetics of IL-2 production and IL-2 receptor (IL-2R) expression, and 3) the effect of antibodies to IL-2 and IL-2R on IFN-gamma secretion. For both antigens, IL-2 and IFN-gamma secretion was T4+ cell-dependent. T. gondii antigen induced high levels of IL-2 at 24 hr which increased further at 48 hr, and IFN-gamma production was strongly inhibited by antibodies to both IL-2 (90 +/- 2%) and IL-2R (80 +/- 5%). In contrast, CMV antigen stimulated low levels of IL-2 at 24 hr which declined still further by 48 hr, and CMV-stimulated IFN-gamma generation was appreciably less well inhibited by antibodies to IL-2 (47 +/- 2%) and IL-2R (31 +/- 8%). These results suggest the possibility of two mechanisms for antigen-induced IFN-gamma production--one primarily dependent on and the other largely independent of IL-2 and its receptor. Both mechanisms, however, require the activity of sensitized T4+ cells.

  • Copyright © 1987 by American Association of Immunologists

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The Journal of Immunology
Vol. 139, Issue 7
1 Oct 1987
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Antigen-induced human interferon-gamma production. Differential dependence on interleukin 2 and its receptor.
C D Kelly, K Welte, H W Murray
The Journal of Immunology October 1, 1987, 139 (7) 2325-2328;

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Antigen-induced human interferon-gamma production. Differential dependence on interleukin 2 and its receptor.
C D Kelly, K Welte, H W Murray
The Journal of Immunology October 1, 1987, 139 (7) 2325-2328;
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Print ISSN 0022-1767        Online ISSN 1550-6606