Relationship between AMPK and the transcriptional balance of clock-related genes in skeletal muscle

American Journal of Physiology. Endocrinology and Metabolism
Elaine VieiraMargit Mahlapuu

Abstract

Circadian clocks coordinate physiological, behavioral, and biochemical events with predictable daily environmental changes by a self-sustained transcriptional feedback loop. CLOCK and ARNTL are transcriptional activators that regulate Per and Cry gene expression. PER and CRY inhibit their own transcription, and their turnover allows this cycle to restart. The transcription factors BHLHB2 and BHLHB3 repress Per activation, whereas orphan nuclear receptors of the NR1D and ROR families control Arntl expression. Here we show the AMP-activated protein kinase (AMPK)gamma(3) subunit is involved in the regulation of peripheral circadian clock function. AMPKgamma3 knockout (Prkag3(-/-)) mice or wild-type littermates were injected with saline or an AMPK activator, 5-amino-4-imidazole-carboxamide riboside (AICAR), and white glycolytic gastrocnemius muscle was removed for gene expression analysis. Genes involved in the regulation of circadian rhythms (Cry2, Nr1d1, and Bhlhb2) were differentially regulated in response to AICAR in wild-type mice but remained unaltered in Prkag3(-/-) mice. Basal expression of Per1 was higher in Prkag3(-/-) mice compared with wild-type mice. Distinct diurnal changes in the respiratory exchange ratio (RER) betw...Continue Reading

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