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  • Title: Inhibitory effects of insulin-like growth factor-binding proteins on steroidogenesis by human granulosa cells in culture.
    Author: Mason HD, Willis D, Holly JM, Cwyfan-Hughes SC, Seppala M, Franks S.
    Journal: Mol Cell Endocrinol; 1992 Nov; 89(1-2):R1-4. PubMed ID: 1284489.
    Abstract:
    The effects of insulin-like growth factor-binding proteins (IGFBPs) 1 and 3 on steroidogenesis by human granulosa cells has been examined. Both IGFBP-1 and IGFBP-3 produced a dose-related inhibition of IGF-I-stimulated oestradiol accumulation in granulosa cell-conditioned medium with complete reversal of the effects of IGF-I in the presence of a molar excess of binding protein. IGFBPs 1 and 3 also exerted a small (25-40%) but significant and consistent inhibition of oestradiol secretion in response to follicle-stimulating hormone (FSH) alone. The progesterone response to IGF-I was inhibited by IGFBPs 1 and 3 but there was no effect on FSH-stimulated progesterone production. These data support the concept of a physiologically important intraovarian IGF system in the human ovary and demonstrate an unequivocally inhibitory effect of IGFBPs 1 and 3 on IGF-I-stimulated granulosa cell steroidogenesis.
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