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- W2008171036 abstract "During perinatal development, when the size of the Sertoli cell population is determined, Leydig cells produce beta-endorphin, a peptide which may interact with Sertoli cells to modify their FSH-responsiveness, as suggested by our previous work. The goal of the present study was first, to test directly the possibility that beta-endorphin modifies the proliferative response of neonatal Sertoli cells to FSH, and second, to gain information on a mechanism(s) involved in any observed effect. We treated isolated 6-day-old Sertoli cells with FSH or vehicle in vitro and measured their incorporation of exogenous, radiolabeled thymidine with quantitative autoradiography. After 2 days in culture with FSH, we detected a 10-fold increase in the rate of Sertoli cell proliferation. The level of cell division in these FSH-treated cultures was identical to that in other cultures exposed to cAMP under similar conditions. In addition, inclusion of beta-endorphin 3 hr prior to FSH or cAMP decreased the effect of the hormone by 50% but left the cAMP response unchanged. Thus, beta-endorphin acts on isolated, neonatal Sertoli cells at a point prior to intracellular production of cAMP to suppress their response to FSH. When other cultures were treated with pertussis toxin, a blocker of intracellular GTP-binding proteins such as Gi, before sequential addition of endorphin and FSH, the effect of beta-endorphin on FSH-responsiveness was abolished. Moreover, when other cultures were exposed to pertussis toxin in the absence of endorphin, followed by FSH, their response to the hormone was unchanged.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2008171036 date "1990-03-01" @default.
- W2008171036 modified "2023-10-14" @default.
- W2008171036 title "Endorphin suppresses FSH-stimulated proliferation of isolated neonatal sertoli cells by a pertussis toxin-sensitive mechanism" @default.
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- W2008171036 doi "https://doi.org/10.1002/ar.1092260308" @default.
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