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The Journal of Immunology, Vol 157, Issue 5 2096-2102, Copyright © 1996 by American Association of Immunologists
ARTICLES |
MM Elloso, HC van der Heyde, A Troutt, DD Manning and WP Weidanz
Department of Medical Microbiology and Immunology, University of Wisconsin Medical School, Madison 53706, USA.
We examined the cellular and molecular basis of the proliferative response of human gamma delta T cells in cultures of PBMC stimulated with blood-stage Plasmodium falciparum malarial Ag. Flow cytometry revealed that maximal gamma delta T cell proliferation occurs after maximal CD4+ alpha beta T cell proliferation. Depletion of CD4+ T cells from PBMC before stimulation with malarial Ag markedly reduces the number of proliferating gamma delta T cells, which suggests that CD4+ T cells function in providing help to gamma delta T cells to respond to this parasite Ag. Removal of gamma delta T cells, however, did not alter the expansion of the CD4+ T cell subset. The addition of exogenous IL-2, IL-4, or IL-15 restored the capacity of gamma delta T cells to proliferate in Ag-stimulated cultures of PBMC depleted of CD4+ T cells. mAbs specific for the alpha- and beta-subunits of the IL-2 receptor inhibit the gamma delta T cell subset expansion in cultures stimulated with malarial Ag. Taken together, these findings suggest that the proliferation of gamma delta T cells in response to malarial Ag is dependent on the presence of CD4+ alpha beta T cells, but the requirement for CD4+ alpha beta T cells can be met by cytokines that use the IL-2R.
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