Inhibin A is a follicle stimulating hormone-responsive marker of granulosa cell differentiation, which has both autocrine and paracrine actions in sheep

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Abstract
The aim of these studies was to examine the origin, control and local actions of inhibin A in monovular species, using the sheep as a model. Experiment 1 examined the pattern of mRNA expression for the inhibin subunits in relation to follicular size and pattern of expression to other differentiative markers in granulosa (P450 aromatase) and thecal cells (P450 17alpha-hydroxylase). Experiment 2 examined the pattern of inhibin A production, in relation to oestradiol, by granulosa cells induced to differentiate in vitro with follicle-stimulating hormone (FSH). Experiment 3 examined possible paracrine and autocrine actions of inhibin A by determining the effect of addition of human recombinant inhibin A and/or antiserum to inhibin on gonadotrophin-stimulated cellular differentiation. The results of Experiment 1 showed that expression of mRNA encoding inhibin subnuits alpha, beta(A) and beta(B) is greater (P

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