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The Journal of Immunology, Vol 144, Issue 12 4548-4554, Copyright © 1990 by American Association of Immunologists

ARTICLES

The human antimurine xenogeneic cytotoxic response. I. Dependence on responder antigen-presenting cells

PJ Lucas, GM Shearer, S Neudorf and RE Gress
Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892.

We have examined the role of the human responder APC in the generation of CTL responses to xenogeneic antigens. Of six xenogeneic responses evaluated, only the human antimurine response was dependent on human APC for CTL generation. APC requirements for the other five xenogeneic responses more closely resembled those observed in the generation of human or murine alloreactive CTL. Depletion studies identified a defective human CD4+ Th cell-murine stimulator cell interaction that could be bypassed by the addition of exogenous IL-2. The function of the responder APC involved in the human antimurine CTL response was inhibited by chloroquine, suggesting a requirement for Ag processing. Effective presentation of murine stimulator Ag by human APC was completely blocked by anti-human Ia mAb, indicating that the Ag is presented to Th cells via the human class II molecule. These results are consistent with an Ia-dependent recognition of processed murine Ag by human T cells and represents a model for investigating human T cell activation requirements, Th cell function, and MHC restriction.


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