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- W2046571951 abstract "Farnesyltransferase inhibitors (FTIs), developed as anti-cancer drugs, have the potential to modulate immune responses without causing nonspecific immune suppression. We have investigated the possibility that FTIs, by affecting T cell cytokine secretion, can attenuate alloreactive immune responses. The effects of FTIs on murine alloreactive T cells were determined both in vitro, by measuring cytokine secretion or cell proliferation in mixed lymphocyte cultures, and in vivo, by performing skin allografts from H-2bm12 mice to MHC class II-disparate B6 mice. We found that two different FTIs, ABT-100 and L-744,832, blocked secretion of IFN-γ, IL-2, IL-4, and TNF-α from naïve T cells in vitro. ABT-100 and L-744,832 blocked cytokine production from both CD4+ and CD8+ naïve T cells stimulated with CD3 and CD28 antibodies, but only if the cells were pretreated with the FTIs for 48 h. Proliferation of alloreactive T cells in mixed lymphocyte cultures was blocked by either FTI. We also found that the proliferation of enriched T cells stimulated with IL-2 was blocked by ABT-100 treatment. In mice with an MHC class II-disparate skin graft, rejection of primary allografts was significantly delayed by treatment with either ABT-100 or L-744,832. Secondary rejection in mice previously primed to the alloantigen was found to be unaffected by L-744,832 treatment. We have shown that FTIs can block T cell cytokine secretion and attenuate alloreactive immune responses. The ability of FTIs to block secretion of cytokines, including IFN-γ and IL-4, from naïve T cells provides a likely biological mechanism for the specific suppression of class II MHC-mediated allorejection. These results demonstrate that FTIs may have useful immunomodulatory activity due to their ability to delay priming to alloantigens." @default.
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- W2046571951 date "2009-01-01" @default.
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- W2046571951 title "Delayed rejection of MHC class II-disparate skin allografts in mice treated with farnesyltransferase inhibitors" @default.
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- W2046571951 doi "https://doi.org/10.1016/j.trim.2008.09.011" @default.
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