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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Multiple inhibitory effects of a luteinizing hormone-releasing hormone agonist on hCG-dependent steroidogenesis and on FSH-dependent responses in ovarian cells in vivo and in vitro.

[125I] labelled [D-Leu6, des-Gly-NH10(2)] LH-RH ethylamide (LH-RHa), when injected into immature female rats, bound specifically not only to the pituitary but also to the ovaries. LH-RHa inhibited hCG-stimulated progesterone production and ovarian weight augmentation in hypophysectomized immature female rats in vivo. FSH-induced ovarian hCG receptors and ovarian weight gain in diethylstilbestrol (DES)-treated hypophysectomized immature female rats were also suppressed by LH-RHa. Progesterone production by rat luteal cells in vitro was inhibited by LH-RHa. LH-RHa did not change the affinity or population of LH/hCG receptor in porcine granulosa cells in short term incubation. However, LH-RHa inhibited induction of LH/hCG receptor stimulated by FSH and insulin in long term culture of porcine granulosa cells. LH-RHa delayed hCG-stimulated cyclic AMP accumulation in porcine granulosa cells. These findings suggest that LH-RHa inhibits hCG-stimulated cyclic AMP accumulation and subsequent progesterone production as well as FSH-stimulated LH/hCG receptor induction by acting directly on ovarian cells.[1]


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