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Local feedback loop of ghrelin-GH in the pig ovary: action on estradiol secretion, aromatase activity and cell apoptosis.

Growth Horm. IGF Res.2008 Jun;18(3):221-7. Epub 2007 Oct 22
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摘要


Ghrelin is recognized as an important regulator of growth hormone (GH) secretion, food intake and a factor which controls reproduction. In the present studies, the effect of GH and insulin-like growth factor (IGF-I) on ghrelin synthesis and secretion and the effects of ghrelin on GH synthesis and secretion in cultured whole porcine follicles were studied. Ghrelin and GH levels were measured in the follicular wall and in the culture medium. Moreover, the action of combined treatment with ghrelin and GH on estradiol secretion, aromatase activity and cell apoptosis were examined. We demonstrated that ghrelin increased GH secretion but not GH synthesis by ovarian follicles. GH stimulated both ghrelin synthesis and secretion in the ovarian follicles. The increase in estradiol secretion, aromatase activity and the decrease in caspase-3 activity were noted in ghrelin alone- and ghrelin in combination with GH-treated cells. In culture treated with combination of both these hormones, all investigated parameters were similar to those noted in ghrelin alone-treated cells. In conclusion, our study provides novel evidence for the gonadal feedback loop between GH and ghrelin secretion in the ovary. However, results of the presented research suggest independent action of GH and ghrelin in the ovary.

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