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Updated: Oct 6, 2026

A Tissue Culture Model of Estrogen-producing Primary Bovine Granulosa Cells
05:36

A Tissue Culture Model of Estrogen-producing Primary Bovine Granulosa Cells

Published on: September 6, 2018

Production of insulin-like growth factors by ovarian granulosa cells

J M Hammond, J L Baranao, D Skaleris

    Endocrinology
    |December 1, 1985
    PubMed

    Evidence for ovarian secretion of somatomedins or insulin-like growth factors (IGF's) was generated by two approaches. First, porcine granulosa cells were shown to produce IGF's and an IGF-binding protein under serum-free conditions in vitro. The ovarian IGF's were recognized in two competitive binding assays specific for IGF's, a RIA using antibodies to human IGF-I and a radioreceptor assay using rat liver plasma membranes. IGF secretion was maintained for at least 10 days in culture. Second, ovarian production of IGF's in vivo was suggested by studies which showed that IGF levels in follicular fluid from preovulatory follicles were significantly greater than those in either serum or immature follicles. In contrast, similar low levels of insulin were observed in the follicles and serum. In conjunction with previous evidence of IGF action on granulosa cells, the present studies suggest the possibility of an autocrine role of IGF's in regulating follicular growth and development.

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