Induction of alloantigen-specific CD4+ T regulatory Type 1 cells by alloantigen immunization and ultraviolet-B irradiation: a pilot study in murine transplantation models with skin and cardiac allografts.

BACKGROUND The use of ultraviolet (UV)-B irradiation after alloantigen immunization is unknown because previous studies focused on UV-B irradiation before immunization. Here, we investigated immunosuppressive effects induced by UV-B irradiation after immunization, and examined the phenotype of induced regulatory T cells and the possible mechanism of induction. MATERIAL AND METHODS B6 mice (H-2(b)) were intravenously immunized by splenocytes from CBF1 mice (H-2(b/d)). One week after alloantigen immunization, B6 mice received high-dose UV-B irradiation (40 kJ/m(2)). Four weeks after UV-B irradiation, proliferation assays (n=4, in each), transplantations with skin or cardiac allografts (n=5, in each), cytokines in mixed lymphocyte culture (n=6, in each), and adoptive transfer of CD4(+) T cells to naïve B6 mice (n=5, in each) were performed. Mice were divided into 4 groups: untreated control, immunized control, UV-irradiated control, and an immunized and UV-irradiated group. B6C3F1 mice (H-2(b/k)) were used as irrelevant alloantigen with immunization controls. Anti-IL-10 monoclonal antibody was used to block IL-10 before and after UV-B irradiation. RESULTS Immune responses against the immunizing antigen were markedly suppressed in immunized and UV-irradiated mice in an alloantigen-specific manner. Surprisingly, CD4(+) T cells from immunized and UV-irradiated mice produced significantly larger amounts of IL-10, in an alloantigen-specific manner. Moreover, alloantigen-specific immunosuppression via CD4(+) regulatory T cells was transferable to naïve B6 mice. IL-10 blocking clearly abrogated alloantigen-specific immunosuppression, indicating that UV-B irradiation evoked T regulatory type 1 cells. CONCLUSIONS This study demonstrates for the first time that immunization and UV irradiation induces alloantigen-specific CD4(+) T regulatory type 1 cells, and that IL-10 plays an important role for this induction.

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