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• W2012259061 endingPage "237" @default.
• W2012259061 startingPage "230" @default.
• W2012259061 abstract "Many hormones elicit effects on target cells by stimulating the enzyme phospholipase-C, which catalyzes the hydrolysis of phosphoinositides to the intracellular second messengers diacylglycerol and inositol phosphates. The present study examined the roles of FSH and guanine nucleotide-binding proteins (G-proteins) in regulating the hydrolysis of phosphoinositides in Sertoli cells. Sertoli cell cultures prepared from 16- to 18-day-old rats were incubated for 24 h with myo-[2-3H] inositol to label endogenous phospholipids. Treatment of cells from 0.5-20 min with preparations of ovine FSH ranging in potency from 1-60 times that of NIH FSH S1 did not affect accumulation of inositol phosphates. Levels of total [3H]inositol phosphates [[3H]inositol mono-, di-, and triphosphates (IP, IP2, and IP3)] in FSH-treated cultures was 75-120% the levels in control cultures over the various time intervals studied. Addition of testosterone and the combination of testosterone plus retinoic acid, agents that have been shown to potentiate effects of FSH in other systems, did not affect accumulation of inositol phosphates in response to FSH. In contrast to the lack of effect on accumulation of inositol phosphates, FSH stimulated 4- to 11-fold increases in estradiol secretion over 24 h of culture, indicating that Sertoli cells were viable and responsive to FSH. AIF4- has been shown to activate G-proteins involved in regulation of adenylate cyclase activity. In the present study, AIF4- induced 4- to 5-fold increases in IP, IP2, and IP3 in experiments wherein FSH had no effect. Pretreatment of Sertoli cells with pertussis toxin (100 and 1000 ng/ml) for 24 h inhibited fluoride-induced generation of IP, IP2, and IP3 by 24-51%. Similar treatment with cholera toxin had no effect on basal or fluoride-induced generation of IP2 or IP3, but increased fluoride-induced generation of IP by 20-34%. These results suggest that phospholipase-C activity in Sertoli cells is modulated by a pertussis toxin-sensitive G-protein(s), but does not appear to be affected by FSH." @default.
• W2012259061 created "2016-06-24" @default.
• W2012259061 creator A5035022243 @default.
• W2012259061 creator A5039572974 @default.
• W2012259061 date "1988-07-01" @default.
• W2012259061 modified "2023-09-27" @default.
• W2012259061 title "Regulation of the Phosphoinositide Pathway in Cultured Sertoli Cells from Immature Rats: Effects of Follicle- Stimulating Hormone and Fluoride*" @default.
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• W2012259061 doi "https://doi.org/10.1210/endo-123-1-230" @default.
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