Production of insulin-like growth factors by ovarian granulosa cells

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 c...

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Bibliographic Details
Published inEndocrinology (Philadelphia) Vol. 117; no. 6; p. 2553
Main Authors Hammond, J M, Baranao, J L, Skaleris, D, Knight, A B, Romanus, J A, Rechler, M M
Format Journal Article
LanguageEnglish
Published United States 01.12.1985
Subjects
Animals
Cells, Cultured
Chromatography, Gel
Culture Media
Female
Granulosa Cells - metabolism
Insulin-Like Growth Factor I - biosynthesis
Molecular Weight
Ovarian Follicle - secretion
Somatomedins - biosynthesis
Swine
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Summary: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.
ISSN:0013-7227
DOI:10.1210/endo-117-6-2553