Human Reproduction, Vol 12, 1714-1719, Copyright © 1997 by Oxford University Press
DA Magoffin and AJ Jakimiuk
Recent measurements of circulating inhibin A and inhibin B concentrations
indicate that inhibin B may play an important role in the selection of
dominant follicles. The concentrations of inhibin A, inhibin B and activin
A were measured in the follicular fluids of 61 individual follicles (4.8-20
mm in diameter) from 47 regularly cycling women using specific two-site
enzyme-linked immunosorbent assays. The microenvironment of each follicle
was characterized by measuring follicular fluid androstenedione and
oestradiol concentrations. The mean activin A concentrations were < 8
ng/ml for follicles of all sizes (4-17 mm). Inhibin A concentrations were
< 1 ng/ml in follicles < 6 mm, and progressively increased to
concentrations > 50 ng/ml in follicles > or = 13 mm. Follicles with
androstenedione/oestradiol ratios < or = 4 had higher concentrations of
inhibin A than follicles with androstenedione/oestradiol ratios > 4.
Inhibin B concentrations were higher than inhibin A concentrations in all
follicles, increasing from 19.2 +/- 8.3 ng/ml in 4 mm follicles to 409 +/-
9.6 ng/ml in 13 mm follicles and then declining to 275 +/- 47 ng/ml in 17
mm follicles. These results support the hypothesis that inhibin B may play
a more important paracrine role in developing follicles and a greater
regulatory role with respect to follicle stimulating hormone (FSH)
secretion than inhibin A.
ARTICLES
Inhibin A, inhibin B and activin A in the follicular fluid of regularly cycling women
Department of Obstetrics and Gynecology, CSMC Burns and Allen Research Institute, UCLA School of Medicine, Los Angeles, CA 90048, USA.
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