FOLLISTATIN ANTAGONIZES THE EFFECTS OF ACTIVIN-A ON STEROIDOGENESIS IN HUMAN LUTEINIZING GRANULOSA-CELLS

被引:62
作者
CATALDO, NA [1 ]
RABINOVICI, J [1 ]
FUJIMOTO, VY [1 ]
JAFFE, RB [1 ]
机构
[1] UNIV CALIF SAN FRANCISCO, CTR REPROD ENDOCRINOL, DEPT OBSTET GYNECOL & REPROD SCI, SAN FRANCISCO, CA 94143 USA
关键词
D O I
10.1210/jc.79.1.272
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Activin-A decreases progesterone secretion and aromatase activity in cultured human luteinizing granulosa cells. Follistatin is a binding protein for activin and inhibin produced by granulosa cells and present in follicular fluid. The present study examines the hypothesis that follistatin reverses the actions of activin-A on human granulosa cells. Granulosa cells from women undergoing ovarian stimulation for in vitro fertilization were cultured in defined medium with recombinant human (rh) activin-A and purified porcine follistatin. Follistatin completely reversed the inhibition of basal progesterone production by rh-activin-A, but only when added in a greater than 2:1 molar ratio to activin-A. Although variable effects of activin-A on aromatase activity were observed in these studies, follistatin also antagonized these effects. Follistatin had no effect in the absence of added activin-A. rh-Inhibin-A did not alter steroidogenesis by granulosa cells either with or without added activin-A. Even when added in a 45-fold molar excess, inhibin-A did not displace sufficient activin-A from follistatin to inhibit progesterone secretion. This suggests that the affinity of inhibin-A for follistatin is much lower than that of activin-A, and/or that activin-A bound to follistatin dissociates slowly. alpha(2)-Macroglobulin, another activin-binding protein, did not alter the inhibition of progesterone production by activin-A. We conclude that in human granulosa cells, follistatin, but not alpha(2)-macroglobulin or inhibin-A, acts to modulate the actions of activin-A. Follistatin and activin may be viewed as components of an autocrine/paracrine system within the human follicle that regulate the differentiated functions of granulosa cells.
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页码:272 / 277
页数:6
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