Abstract
When C3H (H-2k, Mls-1b) mice were primed intravenously with 10(8) viable spleen cells from AKR (H-2k, Mls-1a) and treated intraperitoneally with 200 mg/kg of cyclophosphamide (CP) 2 d later, not only a long-lasting skin allograft tolerance but also a tolerance in mixed lymphocyte reaction to Mls-1a-encoded antigens was established. The cellular mechanisms of CP-induced tolerance were examined by assessing the V beta 6-bearing T cells that are strongly correlated with reactivity to Mls-1a-encoded antigens bound to MHC class II molecules. At the relatively early stage (2 or 5 wk) after the CP treatment, CD4+-V beta 6+ T cells of C3H origin were preferentially eliminated in the lymph nodes of the tolerant mice, whereas CD8+-V beta 6+ T cells remained. On the other hand, neither CD4+CD8- nor CD4-CD8+ thymocytes bearing a high density of V beta 6 was detected in the chimeric thymus. Namely, in the thymus of the tolerant C3H mice, neither mixed chimerism nor the clonal deletion of the V beta 6-bearing T cells was observed on day 14, whereas both of them were observed on day 35. The clonal deletion and mixed chimerism in the thymus were lasting for greater than 10 wk after the CP treatment. Expression of V beta 6 on the peripheral T cells in the tolerant C3H mice gradually reduced in the process of time. These results strongly suggested that the clonal deletion in the thymus was one of the essential mechanisms in the CP-induced tolerance system.
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Selected References
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