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Specificity repertoire of splenic lyt 2 positive f23 positive cytotoxic lymphocyte precursors from b6 mice

, : Specificity repertoire of splenic lyt 2 positive f23 positive cytotoxic lymphocyte precursors from b6 mice. Cellular Immunology 106(1): 100-113

As revealed by flow cytometric analysis, about 30% of nylon wool nonadherent Lyt-2+ B6 spleen cells were F23+, i.e., were stained with the monoclonal antibody F23, 1 directed against an allotypic T-cell receptor determinant. The specificity repertoire of splenic Lyt-2+/F23+ cytotoxic lymphocyte precursors (CLP) from B6 mice was investigated in a limiting dilution (LD) system designed to support clonal expansion in vitro of a representative fraction of this T-cell subset: in highly purified Lyt-2+ responder cells cocultured with mitomycin-treated F23 hybridoma cells in the presence of (recombinant) interleukin 2 under LD conditions, one out of three Lyt-2+/ F23+ CLP gave rise to a functional cytotoxic T lymphocyte (CTL) clone. The split-well analysis of individual CTL populations demonstrated a clear-cut segregation of the lytic reactivities toward different allogeneic Con A blast targets. A large fraction of B6-derived CTL clones (3-10%) specifically lysed fully H-2 allogeneic (H-2k, H-2d), or H-2K mutant (bm 1) targets. Self-reactive and allorestricted lytic patterns were not found.

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