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Effect of androgen substrates on the steroidogenic pattern of cumulus cells: correlation with cumulus culture morphology.

Abstract：

BACKGROUND:In previous studies, higher progesterone secretion was observed in mature versus immature cumulusoocyte complexes. In mature cumulus mass that become homogeneously spread in culture (type C/D) progesterone secretion was higher than in partially (type B) or totally (type A) aggregated morphology. In sharp contrast, estradiol-17 beta secretion was significantly higher in type A than type C/D cumulus. PURPOSE:Our purpose was to assess whether the decreased estradiol-17 beta level in type C/D cumulus culture is caused by deficiency of substrates. METHODS:The different cumulus types were incubated with or without 10(-7) M dehydroepiandrosterone, 4-androstane-3, 17-dione, or testosterone. The levels of estradiol-17 beta, testosterone, and progesterone, were measured after 24 hr of culture. RESULTS:The addition of dehydroepiandrosterone or 4-androstane-3, 17-dione significantly increased the estradiol-17 beta levels in all types of cumulus cells, whereas the addition of testosterone was less effective. In all types of cumulus cells the testosterone levels increased significantly on adding these androgen substrates. In the type C/D cumulus, the testosterone increased to lower levels compared to type A cumulus cells. In the presence of these androgens progesterone secretion is significantly reduced in type A cumulus cells. In type C/D cumulus cells, however, progesterone levels were significantly higher than in type A. The estradiol-17 beta/ testosterone and progesterone/estradiol-17 beta ratios, which partially resemble the degree of aromatase activity and the degree of selectivity for progesterone secretion, respectively, were higher in type C/D than in type A cumulus cells. CONCLUSIONS:In type C/D cumulus the significant increase in estradiol-17 beta secretion in the presence of various androgens suggests that, under basal conditions, androgen is less available for estradiol-17 beta biosynthesis compared to type A cumulus. Furthermore, the higher progesterone secretion in type C/D cumulus may suggest that the follicles yielding type C/D cumulus cells are more mature than the follicles yielding type A cumulus.

journal_name

J Assist Reprod Genet

journal_title

Journal of assisted reproduction and genetics

authors

Bar-Ami S,Regev A,Gitay-Goren H

doi

10.1007/BF02765828

subject

Has Abstract

pub_date

1997-05-01 00:00:00

pages

270-6

issue

eissn

1058-0468

issn

1573-7330

journal_volume

pub_type

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Effect of androgen substrates on the steroidogenic pattern of cumulus cells: correlation with cumulus culture morphology.