Crucial role of estrogen receptor-alpha interaction with transcription coregulators in follicle-stimulating hormone and transforming growth factor beta1 up-regulation of steroidogenesis in rat ovarian granulosa cells.
This study was to explore estrogen receptor (ER) involvement in FSH and TGFbeta1-stimulated steroidogenesis in rat ovarian granulosa cells. We first determined the specific involvement of ERalpha and ERbeta in the process, and then investigated the molecular interaction of ERalpha and transcription coregulators in FSH and TGFbeta1 up-regulation of steroidogenic gene expression. Primary culture of ovarian granulosa cells from antral follicles of gonadotropin-primed immature rats was used. Interestingly, a selective ERalpha antagonist methyl-piperidino-pyrazole (MPP) [like ER antagonist ICI-182,780 (ICI)] decreased FSH +/- TGFbeta1-stimulated progesterone production, whereas an androgen receptor antagonist hydroxyflutamide and particularly a selective ERbeta antagonist 4-[2-Phenyl-5,7-bis(trifluoromethyl) pyrazolo [1,5-a] pyrimidin-3-yl] phenol had no significant effect. Consistent with this, a selective ERbeta agonist diarylpropionitrile (unlike 17beta-estradiol) also had no effect on FSH +/- TGFbeta1-stimulated progesterone production. Furthermore, a selective ERalpha agonist 4,4',4''-(4-Propyl-[1H]-pyrazole-1,3,5-triyl)trisphenol (like 17beta-estradiol) enhanced FSH-stimulated progesterone production, and this was abolished by pretreatment with MPP. Immunoblotting and chromatin immunoprecipitation analyses indicate that MPP/ICI suppression of FSH +/- TGFbeta1 action is partly attributed to the reduced ERalpha-mediated expression of Hsd3b and Cyp11a1 genes, but not steroidogenic acute regulatory protein. Furthermore, FSH +/- TGFbeta1 increased ERalpha association with histone acetylases (CBP and SRC-1) and coactivator of peroxisome proliferator-activated receptor gamma (PGC-1alpha), and MPP/ICI dramatically reduced these interactions. In addition, FSH +/- TGFbeta1 increased CBP, SRC-1, and PGC-1alpha binding to Hsd3b and Cyp11a1 genes. Together, we demonstrate for the first time that ERalpha interaction with transcription coregulators, histone acetylases (CBP/SRC-1), and PGC-1alpha is crucial to FSH and TGFbeta1-up-regulated expression of Hsd3b and Cyp11a1, and, thus, progesterone production in rat ovarian granulosa cells.
Chen
Yun-Ju
YJ
Institute of Physiology, School of Medicine, National Yang-Ming University, 155 Linong Street, Section 2, Taipei 112, Taiwan.
Lee
Ming-Ting
MT
Yao
Hsiao-Chun
HC
Hsiao
Pei-Wen
PW
Ke
Ferng-Chun
FC
Hwang
Jiuan-Jiuan
JJ
D015096:3-Hydroxysteroid Dehydrogenases / Q000235:genetics / Q000378:metabolism; D000818:Animals; D002786:Cholesterol Side-Chain Cleavage Enzyme / Q000235:genetics / Q000378:metabolism; D047628:Estrogen Receptor alpha / Q000378:metabolism* / Q000502:physiology; D005260:Female; D005640:Follicle Stimulating Hormone / Q000494:pharmacology*; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects*; D006107:Granulosa Cells / Q000187:drug effects* / Q000201:enzymology / Q000378:metabolism; D051548:Histone Acetyltransferases / Q000378:metabolism; D000071248:Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha; D011485:Protein Binding; D016601:RNA-Binding Proteins / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D013256:Steroids / Q000096:biosynthesis*; D015534:Trans-Activators / Q000378:metabolism*; D014157:Transcription Factors / Q000378:metabolism; D053773:Transforming Growth Factor beta1 / Q000494:pharmacology*; D015854:Up-Regulation / Q000187:drug effects / Q000235:genetics
D047628:Estrogen Receptor alpha; D000071248:Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha; C501429:Ppargc1a protein, rat; D016601:RNA-Binding Proteins; D013256:Steroids; D015534:Trans-Activators; D014157:Transcription Factors; D053773:Transforming Growth Factor beta1; D005640:Follicle Stimulating Hormone; D015096:3-Hydroxysteroid Dehydrogenases; C477269:3 beta-hydroxy-delta 5-steroid dehydrogenase, rat; D002786:Cholesterol Side-Chain Cleavage Enzyme; D051548:Histone Acetyltransferases