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- W1963600395 abstract "Sertoli cell-enriched cultures derived from 19-day old rats were exposed to FSH, l-isoproterenol, glucagon and dbcAMP for 24 up to 96 h. The influence of primary stimulation with these agonists on the response of the cells to subsequent stimulation with the homologous or heterologous agonists was investigated. Particular attention was paid to the response of the aromatase system defined as the ability of the cells to convert testosterone into 17β-estradiol. The responsiveness of this system was compared with the responsiveness of two other systems: adenylate cyclase and phosphodiesterase. It could be demonstrated that preincubation with the mentioned agonists results in a decreased responsiveness (maximal response) and a decreased sensitivity (ED)50 upon re-stimulation with the homologous agonists. Preincubation with FSH also provokes partial desensitization for glucagon and l-isoproterenol. This heterologous desensitization can be mimicked by dbcAMP. The mentioned desensitization reactions are accompanied by a marked decrease in the accumulation of cAMP in the medium. Whereas desensitization of the adenylate cyclase occurs rapidly, desensitization of the aromatase response requires protracted stimulation for 3–4 days. In contrast with the adenylate cyclase and the aromatase system, the responsiveness of phosphodiesterase to FSH, l-isoproterenol, glucagon and dbcAMP is not affected by repeated stimulation for 96 h. It is concluded that hormonal desensitization affects both early (cAMP) and late (aromatase) responses of the Sertoli cell. However, some responses, such as phosphodiesterase activity seem to escape the desensitization process." @default.
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- W1963600395 date "1986-07-01" @default.
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- W1963600395 title "Desensitization of sertoli cell-enriched cultures by FSH, l-isoproterenol and glucagon. influence on subsequent stimulation of 17β-estradiol production" @default.
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- W1963600395 doi "https://doi.org/10.1016/0022-4731(86)90279-7" @default.
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