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Division of Clinical Research, Fred Hutchinson Cancer Research Center, and
Department of Medicine, Division of Oncology, University of Washington, Seattle, WA 98105
To follow the fate of alloreactive T cell effectors in graft-vs-host disease, Ld-specific CD8+ T cells from C57BL/6 2C TCR-transgenic donors were transplanted into sublethally irradiated (750 cGy) Ld+ or Ld- recipients. In Ld- C57BL/6 or (BALB/c-dm2 x C57BL/6)F1 recipients, naive 2C T cells engrafted and survived long term, but did not acquire effector function. In Ld+ (BALB/c x C57BL/6)F1 recipients, 2C T cells engrafted, expanded, became cytolytic, destroyed host B cells and double-positive thymocytes, and later disappeared. Despite marked damage to lymphoid and hemopoietic cells by 2C T cells, no significant pathology was detected in other organs, and recipients survived. Ld+ (BALB/c x C57BL/6)F1 recipients died when LPS/endotoxin was administered on day 7 after cell transfer, while Ld- (BALB/c-dm2 x C57BL/6)F1 recipients survived. Our findings show that under certain conditions, a CD8+ T cell population recognizing an extremely limited repertoire of Ags can initiate graft-vs-host disease.
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