Switch of CD8 T cells to noncytolytic CD8-CD4- cells that make TH2 cytokines and help B cells

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Science  18 Jun 1993:
Vol. 260, Issue 5115, pp. 1802-1805
DOI: 10.1126/science.8511588


CD8+ T cells are a major defense against viral infections and intracellular parasites. Their production of interferon-gamma (IFN-gamma) and their cytolytic activity are key elements in the immune response to these pathogens. Mature mouse CD8+ T cells that were activated in the presence of interleukin-4 (IL-4) developed into a CD8-CD4- population that was not cytolytic and did not produce IFN-gamma. However, these CD8- cells produced large amounts of IL-4, IL-5, and IL-10 and helped activate resting B cells. Thus, CD8 effector functions are potentially diverse and could be exploited by infectious agents that switch off host protective cytolytic responses.

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