Activity-dependent repression of muscle genes by NFAT.

Proceedings of the National Academy of Sciences of the United States of America
Zaheer A RanaAndres Buonanno

Abstract

Adult skeletal muscles retain an adaptive capacity to switch between slow- and fast-twitch properties that largely depend on motoneuron activity. The NFAT (nuclear factor of activated T cells) family of calcium-dependent transcription factors has been implicated in the up-regulation of genes encoding slow contractile proteins in response to slow-patterned motoneuron depolarization. Here, we demonstrate an unexpected, novel function of NFATc1 in slow-twitch muscles. Using the troponin I fast (TnIf) intronic regulatory element (FIRE), we identified sequences that down-regulate its function selectively in response to patterns of electrical activity that mimic slow motoneuron firing. A bona fide NFAT binding site in the TnIf FIRE was identified by site-directed mutations and by electrophoretic mobility and supershift assays. The activity-dependent transcriptional repression of FIRE is mediated through this NFAT site and, importantly, its mutation did not alter the up-regulation of TnIf transcription by fast-patterned activity. siRNA-mediated knockdown of NFATc1 in adult muscles resulted in ectopic activation of the FIRE in the slow soleus, without affecting enhancer activity in the fast extensor digitorum longus muscle. These findi...Continue Reading

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Citations

Jul 28, 2009·Proceedings of the National Academy of Sciences of the United States of America·Elisa CalabriaMarta Murgia
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