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- W2129392163 abstract "The aim of the present study was to investigate whether long-term exposure to valproate (VPA) alters follicular steroidogenesis and whether or not this effect is dependent on the degree of follicular development. Small- and medium-sized follicles were obtained from pig ovaries collected, respectively, at days 8-10 and 14-16 of oestrus cycle. Theca interna and granulosa cells were isolated from follicles and placed in the same well in the ratio 1 : 3 with or without the VPA in doses of 100, 300 and 500 micro g ml(-1). The culture medium was changed after 2, 4, 6 and 8 days. In both types of follicles, VPA caused a significant and dose-dependent reduction in both testosterone and estradiol secretion from follicular cells. In small-sized follicles, the testosterone to oestrogen ratio increased at all doses used and after all lengths of time in culture. In medium-sized follicles, a significant increase in the testosterone to oestrogen ratio was only observed at the highest dose level. All doses of VPA caused a marked inhibition of progesterone secretion after 48 hours while during long-term VPA exposure progesterone gradually increased demonstrating luteinization of cells. In conclusion, the present study demonstrates a direct effect of VPA on steroidogenesis. The effect seems to differ to some extent depending on the follicular stage of development. The elevated ratio of testosterone to estradiol suggests that VPA inhibits the conversion of testosterone to estradiol." @default.
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- W2129392163 date "2000-10-01" @default.
- W2129392163 modified "2023-10-03" @default.
- W2129392163 title "Valproate-induced alterations in testosterone, estradiol and progesterone secretion from porcine follicular cells isolated from small- and medium-sized ovarian follicles" @default.
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- W2129392163 doi "https://doi.org/10.1053/seiz.2000.0443" @default.
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