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Analysis of autoreactive I region-restricted T cell colonies isolated from the guinea pig syngeneic mixed leukocyte reaction and from immune responses to conventional foreign antigens.
European Journal of Immunology 1985 May
Guinea pig proliferating T cell colonies were isolated from T cell populations stimulated during the syngeneic mixed leukocyte reaction (SMLR) or following positive selection of immune T lymphocytes specific for pork insulin (PI) or the copolymer of L-glutamic acid, L-lysine (GL). SMLR-responding T cell colonies could be isolated in the absence of any extrinsic antigen and were strictly restricted to the recognition of Ia molecules on stimulator peritoneal exudate cells (PEC) and required both stimulator cells and interleukin 2-enriched fluids for optimal proliferative responses. Blocking of T cell colony proliferation with a panel of monoclonal anti-Ia antibodies showed that SMLR T cell colonies were restricted by discrete and distinct self-Ia epitopes. Analysis of individual T cell colonies generated against PI and GL revealed three types of colonies: (a) antigen specific, I region-restricted; (b) autoreactive, I region-restricted; and (c) antigen specific, but also autoreactive. These doubly reactive colonies were restricted to the same Ia epitope when stimulated with self-PEC alone or when stimulated with self-PEC in the presence of the relevant exogenous antigen. These results substantiate the hypothesis that both the SMLR and antigen-specific responses are mediated by a common set of precursor T lymphocytes and that the guinea pig SMLR is at least in part the result of the polyclonal proliferative responses of several distinct antigen-reactive T cell clones in the absence of exogenous antigen.
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