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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Mitochondrial adenine nucleotide translocator 3 is regulated by IL-4 and IFN-gamma via STAT-dependent pathways.

IL-4 and IFN-gamma are prototypical Th2 and Th1 cytokines, respectively. They reciprocally regulate a number of genes involved in Th1 vs Th2 immune balance. Using DD-PCR analysis, adenine nucleotide translocase (ANT) 3, an enzyme which exchanges ATP and ADP through mitochondrial membrane, has been identified as a novel target counter-regulated by IL-4 and IFN-gamma. We have observed that IL-4 and IFN-gamma each up-regulates ANT3 in T cells both at mRNA and protein levels, while cotreatment of IL-4 and IFN-gamma counter- regulates ANT3 expression. In contrast, other isoforms of ANT were not affected by IL-4 or IFN-gamma. Emplyoing transfection and overexpression of STAT6 and STAT1 in STAT-deficient cells, we demonstrate that induction of ANT3 by IL-4 and IFN-gamma proceeds via pathways involving STAT6 and STAT1, respectively. Furthermore, regulation of ANT3 expression by IL-4 and IFN-gamma correlated with the modulation T cell survival by these cytokines from dex-induced apoptosis. Considering the critical role of mitochondrial ANTs in energy metabolism and apoptosis, ANT3 regulation by IL-4 and IFN-gamma may have a functional implication in cytokine-mediated T cell survival.[1]


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