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Role and regulation of Glycogen synthase kinase-3 beta in bovine spermatozoa.

Mol. Reprod. Dev.2017 Jan;84(1):8-18. doi:10.1002/mrd.22759. Epub 2016 Nov 30
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摘要


The serine/threonine kinase Glycogen synthase kinase 3 (GSK-3) is a master switch that regulates a multitude of cellular pathways, including the acrosome reaction in sperm. In epididymal sperm cells, for example, GSK-3 activity correlates with inhibition of motility-yet no direct pathways connecting GSK-3 activation with loss of motility have been described. Indeed, the details of how GSK-3 is regulated during sperm capacitation and the acrosome reaction remains obscure. To this end, we addressed the involvement of the GSK-3 beta isoform in several known pathways that contribute to motility and the acrosome reaction. We established that Protein kinase A is the main regulator of GSK-3β in sperm, as pre-treatment of cells with a GSK-3 inhibitor prior to addition of H89, an inhibitor of attenuated the motility loss induced by blocking activity. Both induced and spontaneous acrosome reactions also occurred less frequently in sperm treated with GSK-3 inhibitors. Finally, we observed a slow decline in phosphorylation of GSK-3β on Ser 9, which represents an inhibited state, during sperm capacitation; this phenotype is reversed during the induced acrosome reaction, in parallel to activation of Protein phosphatase 1. These results suggest that maintenance of sperm motility and acrosome reaction timing are mediated by duanyu1529 through the regulation of GSK-3 beta activity. Mol. Reprod. Dev. 84: 8-18, 2017. © 2016 Wiley Periodicals, Inc.

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