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Inhibition of FSH action on granulosa cells by low molecular weight components of follicular fluid.

Abstract：

:Immature female rats were injected with a single dose (10 IU) of pregnant mare serum gonadotropin to induce growth and maturation of ovarian follicles. Using such ovaries as a model, we tested the effects of low molecular weight subfractions of charcoal-absorbed bovine follicular fluid (FF-c) on (a) radioiodinated human FSH (125I-hFSH) binding to ovarian homogenates, (b) ovine FSH-stimulated adenylate cyclase activity in granulosa cell homogenates and (c) cAMP production by intact granulosa cells. The follicular fluid was fractionated by ultrafiltration through membranes of differing pore-sized into molecular weight components of 1000-5000 (passing Amicon H1P-5 hollow fibers but retained by Amicon UM-2 membrane) and 500-1000 (passing Amicon UM-2 membrane but retained by Amicon Um-05 membrane). These low molecular weight fractions inhibited 125I-hFSH binding to ovarian receptors, FSH-stimulated cAMP production by rat granulosa cells and FSH-stimulated, as well as fluoride-ion-stimulated adenylate cyclase activity in granulosa cell homogenates. Inhibition of FSH-stimulated adenylate cyclase activity by the FF subfractions was non-competitive as determined by double reciprocal plot analysis. Our results suggest that modulation of FSH effects on granulosa cells may be mediated by low molecular weight constituents of follicular fluid.

journal_name

Mol Cell Endocrinol

journal_title

Molecular and cellular endocrinology

authors

Fletcher PW,Dias JA,Sanzo MA,Reichert LE Jr

doi

10.1016/0303-7207(82)90086-7

subject

Has Abstract

pub_date

1982-03-01 00:00:00

pages

303-15

issue

3

eissn

0303-7207

issn

1872-8057

pii

0303-7207(82)90086-7

journal_volume

25

pub_type

杂志文章

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