Horm Metab Res 2014; 46(11): 761-767
DOI: 10.1055/s-0034-1383647
Endocrine Research
© Georg Thieme Verlag KG Stuttgart · New York

Progesterone-Induced Cyclin G1 Inhibits the Proliferation of Endometrial Epithelial Cell and its Possible Molecular Mechanism

D.-z. Yuan*
1   Department of Physiology, West China School of Preclinical and Forensic Medicine, Sichuan University, Chengdu, P. R. China
,
X.-l. Ding*
1   Department of Physiology, West China School of Preclinical and Forensic Medicine, Sichuan University, Chengdu, P. R. China
,
H.-l. Yu*
1   Department of Physiology, West China School of Preclinical and Forensic Medicine, Sichuan University, Chengdu, P. R. China
,
Z. Cheng*
1   Department of Physiology, West China School of Preclinical and Forensic Medicine, Sichuan University, Chengdu, P. R. China
,
X.-r. Tang*
1   Department of Physiology, West China School of Preclinical and Forensic Medicine, Sichuan University, Chengdu, P. R. China
,
Y.-p. He
1   Department of Physiology, West China School of Preclinical and Forensic Medicine, Sichuan University, Chengdu, P. R. China
,
J.-h. Zhang
1   Department of Physiology, West China School of Preclinical and Forensic Medicine, Sichuan University, Chengdu, P. R. China
,
L. J. Blok
2   Department of Obstetrics and Gynecology, Erasmus Medical Center, Rotterdam, The Netherlands
,
P. Hanifi-Moghaddam
2   Department of Obstetrics and Gynecology, Erasmus Medical Center, Rotterdam, The Netherlands
,
C. W. Burger
2   Department of Obstetrics and Gynecology, Erasmus Medical Center, Rotterdam, The Netherlands
,
L.-m. Yue
1   Department of Physiology, West China School of Preclinical and Forensic Medicine, Sichuan University, Chengdu, P. R. China
› Author Affiliations
Further Information

Publication History

received 12 February 2014

accepted 05 June 2014

Publication Date:
09 July 2014 (online)

Abstract

Under normal conditions, progesterone inhi­bits the estrogen-induced proliferation of endometrial epithelium. Our previous studies have shown that cyclin G1 was progesterone-dependent in mouse endometrial epithelium at peri-implantation, and exogenous cyclin G1 suppressed the proliferation of endometrial cancer cells. The objectives of this study are to determine whether cyclin G1, as a negative regulator of the cell cycle, is involved in the antiproliferative action of progesterone on endometrial epithelial cells, and to explore the possible molecular mechanism of cyclin G1 inhibition. The siRNA-mediated elimination of cyclin G1 attenuated the antiproliferative action of progesterone on endometrial epithelial cells. Immunoprecipitation showed that progesterone-induced cyclin G1 could interact with PP2A to mediate its phosphatase activity. The block of PP2A activity also attenuated the antiproliferative action of progesterone on endometrial epithelial cells and increased the phosphorylated Rb. In conclusion, progesterone-induced cyclin G1 mediates the inhibitory effect of progesterone on endometrial epithelial cell proliferation possibly through the recruitment of PP2A to dephosphorylate Rb.

* These authors contributed equally to this work.


 
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