Dual-Specificity Phosphatase 29 is Induced During Neurogenic Skeletal Muscle Atrophy and Attenuates Glucocorticoid Receptor Activity in Muscle Cell Culture.

Dual-Specificity Phosphatase 29 is Induced During Neurogenic Skeletal Muscle Atrophy and Attenuates Glucocorticoid Receptor Activity in Muscle Cell Culture. Am J Physiol Cell Physiol. 2020 Jul 08;: Authors: Cooper LM, West RC, Hayes CS, Waddell DS Abstract Skeletal muscle atrophy is caused by a decrease in muscle size and strength and results from a range of physiological conditions, including denervation, immobilization, corticosteroid exposure and aging. Newly named Dual Specificity Phosphatase 29 (Dusp29) has been identified as a novel neurogenic atrophy-induced gene in skeletal muscle. qPCR analysis revealed that Dusp29 expression is significantly higher in differentiated myotubes compared proliferating myoblasts. To determine how Dusp29 is transcriptionally regulated in skeletal muscle, fragments of the promoter region of Dusp29 were cloned, fused to a reporter gene, and found to be highly inducible in response to ectopic expression of the myogenic regulatory factors, MyoD and myogenin. Furthermore, site-directed mutagenesis of conserved E-box elements within the proximal promoter of Dusp29 rendered a Dusp29 reporter gene unresponsive to MRF overexpression. Additionally, Dusp29, an atypical Dusp also known as Dupd1/Dusp27, was found to attenuate the ERK1/2 branch of the MAP kinase signaling pathway in muscle cells and inhibit muscle cell differentiation when ectopically expressed in proliferating myoblasts. Interestingly, Dusp29...
Source: Am J Physiol Cell Ph... - Category: Cytology Authors: Tags: Am J Physiol Cell Physiol Source Type: research