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01-08-2016 | Original Article

Effects of BMAL1–SIRT1-positive cycle on estrogen synthesis in human ovarian granulosa cells: an implicative role of BMAL1 in PCOS

Authors: Jiaou Zhang, Jiansheng Liu, Kai Zhu, Yan Hong, Yun Sun, Xiaoming Zhao, Yanzhi Du, Zi-Jiang Chen

Published in: Endocrine | Issue 2/2016

Abstract

Brain and muscle ARNT-like protein 1 (BMAL1) is necessary for fertility and has been found to be essential to follicle growth and steroidogenesis. Sirtuin1 (SIRT1) has been reported to interact with BMAL1 and function in a circadian manner. Evidence has shown that SIRT1 regulates aromatase expression in estrogen-producing cells. We aimed to ascertain if there is a relationship between polycystic ovary syndrome (PCOS) and BMAL1, and whether and how BMAL1 takes part in estrogen synthesis in human granulosa cells (hGCs). Twenty-four women diagnosed with PCOS and 24 healthy individuals undergoing assisted reproduction were studied. BMAL1 expression in their granulosa cells (GCs) was observed by quantitative real-time polymerase chain reaction (qRT-PCR). The level of expression in the PCOS group was lower than that of the group without PCOS (p < 0.05). We also analyzed estrogen synthesis and aromatase expression in KGN cell lines. Both were downregulated after BMAL1 and SIRT1 knock-down and, conversely, upregulated after overexpression treatments of these two genes in KGN cells. Both BMAL1 and SIRT1 had a mutually positive regulation, as did the phosphorylation of JNK. Furthermore, JNK overexpression increased estrogen synthesis activity and the expression levels of aromatase, BMAL1, and SIRT1. In KGN and hGCs, estrogen synthesis and aromatase expression were downregulated after treatment with JNK and SIRT1 inhibitors. In addition, BMAL1, SIRT1, and JNK expression levels were all downregulated. Our results demonstrate the effects of BMAL1 on estrogen synthesis in hGCs and suggest a BMAL1–SIRT1–JNK positive feedback cycle in this process, which points out an important role of BMAL1 in the development of PCOS.

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Title: Effects of BMAL1–SIRT1-positive cycle on estrogen synthesis in human ovarian granulosa cells: an implicative role of BMAL1 in PCOS
Authors: Jiaou Zhang
Jiansheng Liu
Kai Zhu
Yan Hong
Yun Sun
Xiaoming Zhao
Yanzhi Du
Zi-Jiang Chen
Publication date: 01-08-2016
Publisher: Springer US
Published in: Endocrine / Issue 2/2016
Print ISSN: 1355-008X
Electronic ISSN: 1559-0100
DOI: https://doi.org/10.1007/s12020-016-0961-2

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