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- W2010597703 abstract "We examined the temporal relationship between protein synthesis and testosterone production by rat Leydig cells in primary culture. Leydig cells were isolated from adult control Sprague-Dawley rats and from rats that had received LH-suppressive testosterone and estradiol (TE) implants in vivo for 10 days. The cells were incubated for 1-4 h with [35S]methionine in the presence or absence of maximally stimulating ovine LH, and newly synthesized proteins were examined by two-dimensional PAGE autoradiography. Approximately 800-900 newly synthesized polypeptides were readily visible on all autoradiograms, most of which did not differ in the cells from intact control and TE-treated rats. Incubation of cells from the control and treated rats with maximally stimulating LH for 4 h in both cases resulted in significant increases in testosterone production and in three newly synthesized polypeptides. These polypeptides, along with two others that changed little in response to LH, were similar in apparent molecular mass, 30 kDa, but differed in isoelectric point. Time-course studies revealed a temporal relationship between stimulation of the three 30-kDa proteins and of testosterone production. Western blot analysis identified the 30-kDa proteins as steroidogenic acute regulatory protein (StAR). The results of these studies, for the first time utilizing primary cultures of highly purified, testosterone-producing Leydig cells, provide further correlative evidence of a role for StAR protein in the acute regulation of Leydig cell testosterone biosynthesis by LH." @default.
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- W2010597703 date "1998-08-01" @default.
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- W2010597703 title "Leydig Cell Protein Synthesis and Steroidogenesis in Response to Acute Stimulation by Luteinizing Hormone in Rats1" @default.
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- W2010597703 doi "https://doi.org/10.1095/biolreprod59.2.263" @default.
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