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• W328671606 endingPage "301" @default.
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• W328671606 abstract "Activins are homo- or heterodimers of inhibin β subunits that play important roles in the reproductive system. Our previous work has shown that activins A (βAβA), B (βBβB) and AB (βAβB) induce aromatase/estradiol, but suppress StAR/progesterone production in human granulosa-lutein cells. However, the underlying molecular determinants of these effects have not been examined. In this continuing study, we used immortalized human granulosa cells (SVOG) to investigate the effects of activins in regulating StAR/progesterone and the potential mechanisms of action. In SVOG cells, activins A, B and AB produced comparable down-regulation of StAR expression and progesterone production. In addition, all three activin isoforms induced equivalent phosphorylation of both SMAD2 and SMAD3. Importantly, the activin-induced down-regulation of StAR, increase in SMAD2/3 phosphorylation, and decrease in progesterone were abolished by the TGF-β type I receptor inhibitor SB431542. Interestingly, the small interfering RNA-mediated knockdown of ALK4 but not ALK5 reversed the activin-induced suppression of StAR. Furthermore, the knockdown of SMAD4 or SMAD2 but not SMAD3 abolished the inhibitory effects of all three activin isoforms on StAR expression. These results provide evidence that activins A, B and AB down-regulate StAR expression and decrease progesterone production in human granulosa cells, likely via an ALK4-mediated SMAD2/SMAD4-dependent pathway. Our findings provide important insights into the molecular mechanisms underlying the regulatory effects of activins on human granulosa cell steroidogenesis." @default.
• W328671606 created "2016-06-24" @default.
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• W328671606 date "2015-09-01" @default.
• W328671606 modified "2023-10-14" @default.
• W328671606 title "Activin A, B and AB decrease progesterone production by down-regulating StAR in human granulosa cells" @default.
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• W328671606 doi "https://doi.org/10.1016/j.mce.2015.05.016" @default.
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