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Effect of inhibitor and activator of ghrelin receptor (GHS-R1a) on porcine ovarian granulosa cell functions. | LitMetric
It was previously shown, that ghrelin and its agonistic analogue, ghrelin 1-18, can be a stimulator of ovarian cell functions (promoter of proliferation, inhibitor of apoptosis and stimulator of hormones release). The aim of our studies was to compare the action of two ghrelin analogues - ghrelin 1-18, activator of ghrelin receptors (GHS-R1a), and (D-Lys3)-GHRP-6, its inhibitor, on porcine ovarian granulosa cell functions. Effects of (D-Lys3)-GHRP-6 added at doses of 0, 1, 10 or 100 ng/ml on the expression of markers of proliferation (PCNA, cyclin B1, MAPK/ERK1,2), apoptosis (bax, p53, caspase 3) and release of steroid hormones (progesterone, testosterone, estradiol) were examined. In addition, some effect of ghrelin 1-8 on some of these parameters (expression of MAPK/ERK1,2, bax, p53) were verified. It was shown, that (D-Lys3)-GHRP-6 promotes all markers of granulosa cell proliferation, inhibits all markers of apoptosis and stimulates the release of all three steroid hormones. Similar effects of (D-Lys3)-GHRP-6 (inhibitor of GHS-R1a) and ghrelin 1-18 (its stimulator) suggest that the examined effects of these substances on porcine ovaries are not mediated by GHS-R1a. Both chemical analogues could be potentially useful for stimulation of reproductive processes, at least in in vitro conditions.
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