NFAT5 is transcriptionally active in skeletal muscle cells in vitro.

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NFAT5 is transcriptionally active in skeletal muscle cells in vitro. NFAT5 is transcriptionally active in skeletal muscle cells in vitro. (A) Wild-type (+/+) and NFAT5+/- myoblasts containing an NFAT5 reporter plasmid were differentiated for 24 hours and subsequently treated with 100 mM mannitol for 5 hours. Luciferase activity was diminished by 52% in mannitol-treated NFAT5+/- muscle cells compared to the wild type. Data are fold induction over basal levels of luciferase activity in unstimulated cells. (B) Wild-type myoblasts containing either control or NFAT5 reporters were differentiated for 40 hours and subsequently treated with lower concentrations of mannitol (mM) for 5 hours. Data are fold induction over basal levels of luciferase activity in unstimulated cells. (C) Wild-type myoblasts containing an NFAT5 reporter plasmid and VIVIT, a peptide inhibitor of NFATc1-c4 activation, were differentiated for 48 hours and treated with 100 mM glucose. Luciferase activity was similar in the presence or absence of VIVIT. Data are fold induction over basal levels of luciferase activity in unstimulated cells. (D) In parallel experiments, co-transfection of an NFATc1-c4 reporter plasmid and VIVIT led to decreased luciferase activity in cells treated with PMA and ionomycin (*P<0.05). Data are fold induction over basal levels of luciferase activity in unstimulated cells. (E) Wild-type myoblasts containing either control or NFAT5 reporters were differentiated for 24 hours (nMt) or 48 hours (mMt) and analyzed by luciferase assay. NFAT5 was transcriptionally active at all stages of myogenesis. Data are fold increase over levels of luciferase activity in cells containing a reporter with mutated NFAT5 binding sites. (F) NFAT5 transcriptional activity was analyzed as in E, but cells were treated with 100 mM mannitol to induce NFAT5 activity. Maximal NFAT5 activity was observed in myotubes (*P<0.05 for Mb relative to ctrl; **P<0.05 for Mt relative to Mb). Data are fold induction over basal levels of luciferase activity in unstimulated cells. All data in this figure are mean ± s.e.m. from three to four independent experiments. Roddy S. O'Connor et al. J Cell Sci 2007;120:149-159 © The Company of Biologists Limited 2007