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The Journal of Immunology, Vol 137, Issue 10 3087-3092, Copyright © 1986 by American Association of Immunologists
ARTICLES |
SA McCarthy and A Singer
We have analyzed the signals influencing the generation of major histocompatibility complex (MHC) class II allospecific cytolytic T lymphocytes (CTL) and have found that the development of these CTL is actively regulated in primary in vitro cultures by Lyt-2+ T cells triggered in response to MHC class I alloantigens. Class II allospecific CTL can be readily stimulated in primary cultures, but the presence of a simultaneous class I MHC stimulus in these cultures causes a marked reduction of class II-specific CTL activation. This reduction can be prevented by adding to culture a dose of monoclonal anti-Lyt-2 antibody (in the absence of complement) that does not block the generation of class I-specific CTL. The role of MHC class I alloantigens in the regulation of class II allospecific responses illustrates that T cells recognizing class I and class II MHC antigens in mixed leukocyte cultures interact in a complex and nonreciprocal manner to influence the final effector T cell repertoire elicited by this complex immunogenic challenge.
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