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- W2038632023 abstract "We investigated the effects of theca cells or FSH on granulosa cell differentiation and steroid production during bovine early follicular growth, using a co-culture system in which granulosa and theca cells were cultured on opposite sides of a collagen membrane. Follicular cells were isolated from early antral follicles (2–4 mm) that were assumed to be in gonadotropin-independent phase and just before recruitment into a follicular wave. Granulosa cells were cultured under serum-free conditions with and without theca cells or recombinant human FSH to test their effects on granulosa cell differentiation. Messenger RNA levels for P450 aromatase (aromatase), P450 cholesterol side chain cleavage (P450scc), 3β-hydroxysteroid dehydrogenase (3β-HSD), LH receptor (LHr), and steroidogenic acute regulatory protein (StAR) in granulosa cells were measured by real-time quantitative RT-PCR analysis. FSH enhanced aromatase mRNA expression in granulosa cells, but did not alter estradiol production. FSH also enhanced mRNA expression for P450scc, LHr, and StAR in granulosa cells, resulting in an increase in progesterone production. In contrast, theca cells enhanced aromatase mRNA expression in granulosa cells resulting in an increase in estradiol production. Theca cells did not alter progesterone production and mRNA expression in granulosa cells for P450scc, 3β-HSD, LHr, and StAR. The results of the present study indicate that theca cells are involved in both rate-limiting steps in estrogen production, i.e., androgen substrate production and aromatase regulation, and that theca cell-derived factors regulate estradiol and progesterone production in a way that reflects steroidogenesis during the follicular phase of the estrous cycle. Mol. Reprod. Dev. © 2006 Wiley-Liss, Inc." @default.
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- W2038632023 date "2006-01-01" @default.
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- W2038632023 title "Effects of ovarian theca cells on granulosa cell differentiation during gonadotropin-independent follicular growth in cattle" @default.
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- W2038632023 doi "https://doi.org/10.1002/mrd.20246" @default.
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