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• W1930156383 abstract "Abstract Thy-1-bone marrow (BM) cells from C57BL/6 (B6) mice were transferred into thymectomized or non-thymectomized syngeneic B6----B6, allogeneic B6----C3H or semiallogeneic B6----(B6 X C3H)F1, irradiated mice, after which bacterial substances (bacillus Calmette Guérin [BCG] or Bordetella pertussis [Bp]) were administered within 3 days. The regulation of reactivity toward the host environment, i.e., autoresponsiveness in B6----B6 and allotolerance in B6---C3H, was investigated by monitoring a graft-vs-host (GvH)-like wasting syndrome, as well as the in vitro responsiveness of spleen cells from the reconstituted mice in a mixed leukocyte culture/cell-mediated lysis (MLC/CML) assay. The BCG-treated B6----B6 recipients developed a wasting syndrome and MLC/CML reactivity toward syngeneic target cells within 7 wk. This was never observed in BCG-treated but otherwise normal (i.e., nonreconstituted) mice, nor was it seen in any bone marrow chimeras that had been left without BCG treatment, irrespective of host/donor combination or thymectomy. The development of wasting syndrome as well as autoreactivity in BCG-treated B6----B6 mice could be prevented by thymectomizing the recipients before reconstitution or co-cultivating the donor BM cells with syngeneic spleen cells before reconstitution of nonthymectomized recipients. In the allogeneic or semiallogeneic combinations, the BCG treatment resulted in a wasting syndrome and CML/MLC reactivity toward C3H or (C3H X B6)F1 host-derived cells irrespective of thymic presence or absence. No breakdown of allotolerance, however, was retarded in the thymectomized mice, and it could be prevented by co-cultivation of donor BM cells with splenocytes of recipient genotype only if the cells were used to reconstitute thymectomized recipients. The breakdown of allotolerance in B6----C3H chimera was never accompanied by autoreactivity against B6 target cells. It is concluded that induction of autoreactivity and GvH in BCG-treated syngeneic BM chimeras, probably reflecting the breakdown of autotolerance, is strictly thymus dependent. In contrast, induction of anti-host reactivity in BCG-treated allogeneic chimeras may occur in the absence of a thymus and without concomitant autoreactivity, suggesting two independent levels of controls: one that is thymus dependent for the breakdown of auto- as well as allotolerance, and one that is thymus independent, unique for the breakdown of allotolerance." @default.
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• W1930156383 date "1984-10-01" @default.
• W1930156383 modified "2023-10-15" @default.
• W1930156383 title "Role of the thymus in control of autoreactivity or allotolerance in syngeneic and allogeneic bone marrow chimeras treated with bacterial adjuvants." @default.
• W1930156383 doi "https://doi.org/10.4049/jimmunol.133.4.1735" @default.
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