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• W1598257653 abstract "Abstract Down-regulation of the development of CTL has been studied in mice both in vivo and in vitro. To generate CTL to hapten-altered self Ag in vivo, an immunization protocol has been used in which the host's Th cells are stimulated by a minor locus histocompatibility Ag (Mlsd) and its precursor CTL are activated by trinitrophenylated syngeneic spleen cells. Injecting the H-2 compatible Mls-disparate spleen cells along with the TNP-coupled self cells into the hind paws causes TNP-self specific CTL to appear in popliteal lymph nodes within 5 days. We have previously reported that inducing Ts cells by i.v. injecting Mlsd-bearing cells prevents in vivo generation of TNP-self specific CTL after immunization in this way. Here the induced Ts cell as well as the mechanism by which it functions have been further examined. The suppression was seen to extend to allogeneic as well as TNP-self Ag, provided the Mlsd-tolerized animal was reexposed to Mlsd-bearing cells at the time of immunization for CTL. By transferring the Mlsd-induced suppression adoptively we have learned that the splenic suppressor cell bears Thy-1.2 as well as Lyt-1.1 Ag and inhibits the generation of CTL at the afferent limb. In addition, Mlsd-induced PEC of Mlsd-tolerized mice, but not of normal mice, mediated suppression of development of CTL in vivo. The active cells within the tolerized PEC have been identified as T cells and macrophages (M phi). Furthermore, PEC from mice tolerized to Mlsd suppressed generation of CTL directed toward TNP-self targets in vitro. T cells and M phi separated from PEC of Mlsd-tolerized mice achieved suppression best in culture when present together. In addition, Lyt-1+ splenic cells from tolerized but not normal mice cooperated to down-regulate CTL generation in vitro with peritoneal M phi from either tolerized or normal mice. Supernatants of 24- to 72-h cultures of PEC from tolerized mice were suppressive of CTL generation when incorporated at 40 to 50% of culture volume. Supernatants of T cells from tolerized PEC or spleen were suppressive in culture only when M phi from normal mice were also present. To achieve suppression dialyzed supernatants of M phi from tolerized mice could replace the M phi.(ABSTRACT TRUNCATED AT 400 WORDS)" @default.
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• W1598257653 date "1988-02-15" @default.
• W1598257653 modified "2023-09-27" @default.
• W1598257653 title "Down-regulation of cytotoxic T lymphocyte development by a minor stimulating locus-induced suppressor cascade that involves Lyt-1+ suppressor T cells, IA- macrophages, and their factors." @default.
• W1598257653 doi "https://doi.org/10.4049/jimmunol.140.4.1005" @default.
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