Human follicular fluid insulin concentrations

Michael P. Diamond, Bobby W. Webster, R. Keith Carr, Anne Colston Wentz, Kevin G. Osteen

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

In mammals, insulin stimulates granulosa cell aromatase activity and steroid production and is a regulating factor of oocyte maturation. To assess the role of insulin in human follicular and oocyte maturation, human follicular fluid was obtained 32-36 h after hCG administration at the time of oocyte recovery for in vitro fertilization. Follicular fluid insulin levels, measured by RIA, ranged from undetectable (<2 μU/ml) to 65.4 μU/ml. In women treated with human menopausal gonadotropin (n = 21), clomiphene citrate (n = 4), and human menopausal gonadotropin/clomiphene citrate (n = 14), follicular fluid insulin concentrations were 18.0 ± 4.3 (±SE), 10.2 ± 4.2, and 12.0 ± 3.8 μU/ml, respectively (P = NS). Similarly, there was no significant difference in follicular fluid insulin concentrations in follicles with mature (n = 33) or immature (n = 6) oocytes (13.3 ± 2.7 vs. 24.7 ± 9.5 MU/ml) or in oocytes which eventually did (n = 35) or did not (n = 4) fertilize (16.4 ± 3.0 vs. 3.2 ± 0.8 μU/ml). Follicular fluid insulin levels (n = 30) correlated positively with follicular fluid progesterone levels (P < 0.05), but not with follicular fluid estradiol or androstenedione levels or the estradiol to androstenedione ratio. The relationship of follicular fluid insulin and progesterone levels suggests that, as in other mammals, follicular fluid insulin may have a physiological role in follicular maturation.

Original languageEnglish (US)
Pages (from-to)990-992
Number of pages3
JournalJournal of Clinical Endocrinology and Metabolism
Volume61
Issue number5
DOIs
StatePublished - Nov 1985
Externally publishedYes

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry
  • Endocrinology
  • Clinical Biochemistry
  • Biochemistry, medical

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