Cytotoxic T lymphocytes specific for I region determinants do not require interactions with H-2K or D gene products

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Abstract
Gene products coded for by the major hisocompatibility complex (MHC) can serve as target antigens for cytotoxic T lymphocytes (CTL) (1). A variety of test systems are available which have yielded information consistently reinforcing the importance of this complex of genes in the generation and effector phases of the cytotoxic immune response. Originally, it was shown that allogeneically-induced CTL had specificity primarily for the products of the K and D loci of the mouse H-2 complex (2). More recently this has also been found to be the case for xenogeneic immunizations (3,4). Additional examples of T cell-mediated lysis have been reported involving viral-infected or chemically- modified syngeneic stimulating and target cells in which homology at H-2K or H-2D was required between the responding and target cells for appreciable lysis to occur (5-7). Moreover, CTL specific for minor histocompatability antigens are able to lyse only target cells bearing these membrane antigens and sharing a common H-2K or H2-D gene product with the effector (8,9).

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