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Role Of Nr4a3 Nuclear Receptor In Physiological Regulation Of Metabolism, Grace R. Walton

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Nuclear receptor NR4A3 (NOR-1, MINOR) mediates transcriptional responses to ß-adrenergic signaling, is increased in insulin sensitive mice and humans, and enhances insulin-stimulated glucose transport in cultured adipocytes and myocytes. We therefore sought to determine the role of NR4A3 in in vivo adipose tissue and skeletal muscle physiology. Following adipose-specific NR4A3 over-expression in mice, we observed reduced circulating epinephrine due to enhanced catabolism of catecholamines in adipose tissue. Furthermore, this reduction in circulating epinephrine produced broad physiological consequences, including poor glucose tolerance, reduced insulin sensitivity, dyslipidemia, poor cardiac function, and behavioral alterations. In skeletal muscle, we show that NR4A3 protein associates …