BMP15 Suppresses Progesterone Production by Down-Regulating StAR via ALK3 in Human Granulosa Cells

被引:77
作者
Chang, Hsun-Ming [1 ]
Cheng, Jung-Chien [1 ]
Klausen, Christian [1 ]
Leung, Peter C. K. [1 ]
机构
[1] Univ British Columbia, Child & Family Res Inst, Dept Obstet & Gynaecol, Vancouver, BC V5Z 4H4, Canada
基金
加拿大健康研究院;
关键词
BONE MORPHOGENETIC PROTEIN-15; GROWTH-DIFFERENTIATION FACTOR-9; INCREASED OVULATION RATE; FOLLICULAR-FLUID; OVARIAN-FUNCTION; MAMMALIAN OVARY; LUTEIN CELLS; RAT OVARY; EXPRESSION; RECEPTOR;
D O I
10.1210/me.2013-1233
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
In addition to somatic cell-derived growth factors, oocyte-derived growth differentiation factor (GDF)9 and bone morphogenetic protein (BMP) 15 play essential roles in female fertility. However, few studies have investigated their effects on human ovarian steroidogenesis, and fewer still have examined their differential effects or underlying molecular determinants. In the present study, we used immortalized human granulosa cells (SVOG) and human granulosa cell tumor cells (KGN) to compare the effects of GDF9 and BMP15 on steroidogenic enzyme expression and investigate potential mechanisms of action. In SVOG cells, neither GDF9 nor BMP15 affects the mRNA levels of P450 side-chain cleavage enzyme or 3 beta-hydroxysteroid dehydrogenase. However, treatment with BMP15, but not GDF9, significantly decreases steroidogenic acute regulatory protein (StAR) mRNA and protein levels as well as progesterone production. These suppressive effects, along with the induction of Sma and Mad-related protein (SMAD) 1/5/8 phosphorylation, are attenuated by cotreatment with 2 different BMP type I receptor inhibitors (dorsomorphin and DMH-1). Furthermore, depletion of activin receptor-like kinase (ALK)3 using small interfering RNA reverses the effects of BMP 15 on SMAD1/5/8 phosphorylation and StAR expression. Similarly, knockdown of ALK3 abolishes BMP15-induced SMAD1/5/8 phosphorylation in KGN cells. These results provide evidence that oocyte-derived BMP15 down-regulates StAR expression and decreases progesterone production in human granulosa cells, likely via ALK3-mediated SMAD1/5/8 signaling. Our findings suggest that oocyte may play a critical role in the regulation of progesterone to prevent premature luteinization during the late stage of follicle development.
引用
收藏
页码:2093 / 2104
页数:12
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