Abstract
In the mouse, potent primary in vitro proliferation of T cells can be induced by allelic variants of cell-surface glycoproteins, Ia antigens, the genes for which are located in the I region of the major histocompatibility complex (MHC) on chromosome 17. The only other potent primary proliferative response known is induced by mixing MHC-identical lymphocytes from strains that differ at the locus termed Mls (ref. 1) (for mixed lymphocyte stimulating), which has been mapped to chromosome 1. While it is relatively easy to raise antibodies against Ia antigens, and thus determine both their chemical nature and their role in T-cell stimulation, the nature of the product of the Mls locus has remained obscure. It has been proposed that the Mls locus product is a minor antigen recognized in association with self-Ia antigens2,3, a translocated Ia-like element4, or a mitogenic molecule found on the surface of antigen presenting cells (APC)5. Here, we demonstrate that APCs from mice carrying stimulatory Mls locus alleles present antigen more efficiently to cloned, antigen-specific, Ia-restricted T cells than APCs from mice carrying nonstimulating Mls locus alleles. We propose that the Mls locus does not encode a unique cell-surface antigen at all; we suggest instead that the T-cell proliferative response induced by Mls-locus disparate cells reflects recognition of self-Ia molecules on APCs. If our interpretation is correct, it provides further evidence both for the quantitative nature of self tolerance and for the existence of a distinct recognition site for self-Ia molecules on antigen-specific T lymphocytes.
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Janeway, C., Conrad, P., Tite, J. et al. Efficiency of antigen presentation differs in mice differing at the Mls locus. Nature 306, 80–82 (1983). https://doi.org/10.1038/306080a0
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DOI: https://doi.org/10.1038/306080a0
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