Transcription Factor Tfe3 Directly Regulates Pgc-1alpha in Muscle

Journal of Cellular Physiology
Nunciada SalmaDavid E Fisher

Abstract

The microphthalmia (MiT) family of transcription factors is an important mediator of metabolism. Family members Mitf and Tfeb directly regulate the expression of the master regulator of metabolism, peroxisome-proliferator activated receptor gamma coactivator-1 alpha (Pgc-1alpha), in melanomas and in the liver, respectively. Pgc-1alpha is enriched in tissues with high oxidative capacity and plays an important role in the regulation of mitochondrial biogenesis and cellular metabolism. In skeletal muscle, Pgc-1alpha affects many aspects of muscle functionally such as endurance, fiber-type switching, and insulin sensitivity. Tfe3 also regulates muscle metabolic genes that enhance insulin sensitivity in skeletal muscle. Tfe3 has not yet been shown to regulate Pgc-1alpha expression. Our results reported here show that Tfe3 directly regulates Pgc-1alpha expression in myotubes. Tfe3 ectopic expression induces Pgc-1alpha, and Tfe3 silencing suppresses Pgc-1alpha expression. This regulation is direct, as shown by Tfe3's binding to E-boxes on the Pgc-1alpha proximal promoter. We conclude that Tfe3 is a critical transcription factor that regulates Pgc-1alpha gene expression in myotubes. Since Pgc-1alpha coactivates numerous biological prog...Continue Reading

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Jul 28, 2016·The FEBS Journal·Christina PloumiNektarios Tavernarakis
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Sep 7, 2020·Mechanisms of Ageing and Development·Ioanna Daskalaki, Nektarios Tavernarakis
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