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Article Abstract
While Bcl-2 plays an important role in cell apoptosis, its relationship to the orphan nuclear receptors remains unclear. Here we report that mouse embryonic fibroblast (MEF) cells prepared from TR4-deficient (TR4(-/-)) mice are more susceptible to UV-irradiation mediated apoptosis compared to TR4-Wildtype (TR4(+/+)) littermates. Substantial increasing TR4(-/-) MEF apoptosis to UV-irradiation was correlated to the down-regulation of Bcl-2 RNA and protein expression and collaterally increased caspase-3 activity. Furthermore, this TR4-induced Bcl-2 gene expression can be suppressed by co-transfection with TR4 coregulators, such as androgen receptor (AR) and receptor-interacting protein 140 (RIP140) in a dose-dependent manner. Together, our results demonstrate that TR4 might function as an apoptosis modulator through induction of Bcl-2 gene expression.
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| http://dx.doi.org/10.1016/j.bbrc.2007.06.168 | DOI Listing |
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