Abstract
Chimeric B10.A T cells that had matured in a (B10.A X B10.Q)F1 environment acquired the ability to respond to poly(Glu56Lys35Phe9) (GL pi), an antigen to which the B10.A mouse is a nonresponder. The response of the chimeric B10.A T cells was initiated by GL phi on responder B10.Q antigen-presenting cells (APC) but not by GL phi on nonresponder B10.A APC. Similarly, chimeric B10.Q T cells that had matured in a (B10.A X B10.Q)F1 environment acquired the ability to respond to poly(Glu60Ala30Tyr10) (GAT) when the antigen was presented on responder B10.A APC, but not when GAT was presented on nonresponder B10.Q APC. No syngeneic haplotype preference was observed for either antigen. These interactions between H-2 nonidentical T cells and APC were inhibited by anti-H-2 antisera and a monoclonal anti-Ia antibody directed against the APC but not by such antibodies when they were directed against the T cell. These data suggest that, when they develop in a responder chimeric environment, genotypic nonresponder T cells become responders by acquiring receptors that allow them to recognize responder I region products on the surface of APC. Furthermore, the data demonstrate that the site of action of the blocking effects of the anti-Ia antibo...Continue Reading
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