The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 171, 953-958, Copyright © 1990 by Rockefeller University Press

ARTICLES

Response of mature unprimed CD8+ T cells to Mlsa determinants

SR Webb and J Sprent
Department of Immunology, Research Institute of Scripps Clinic, La Jolla, California 92037.

Contrary to existing dogma, evidence is presented that proliferative responses of mature unprimed T cells to Mlsa antigens involve CD8+ cells as well as CD4+ cells. The response of CD8+ cells to Mlsa antigens proved to be heavily dependent on help from CD4+ cells, and responses were stronger in three I-E+ strain combinations than in an I- E- combination. In I-E+ combinations, CD8+ blast cells accounted for 20- 25% of the blasts generated from unseparated T cells responding to Mlsa- bearing stimulator cells in vitro; similar findings applied to blast cells generated in vivo. The observation that the majority (greater than or equal to 50%) of Mlsa-stimulated CD8+ cells (and CD4+ cells) were V beta 6+ indicated that CD8+ cells respond to Mlsa antigens, per se, rather than to nonspecific stimuli. Whether CD4+ and CD8+ cells use the same or different H-2-restricting elements to respond to Mlsa antigens has yet to be resolved.
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