Changes in Gene Expression of Histone Modification Enzymes in Rat Granulosa Cells Undergoing Luteinization During Ovulation

Overview

Journal J Ovarian Res

Publisher Biomed Central

Specialties Gynecology & Obstetrics
Reproductive Medicine

Date 2016 Mar 17

PMID 26979106

Citations 8

Authors

Ryo Maekawa

Lifa Lee

Maki Okada

Hiromi Asada

Masahiro Shinagawa

Isao Tamura

Shun Sato

Hiroshi Tamura

Norihiro Sugino

Affiliations

Soon will be listed here.

Abstract

Background: The ovulatory LH surge rapidly alters the expression of steroidogenesis-related genes such as steroidogenic acute regulatory protein (StAR) in granulosa cells (GCs) undergoing luteinization. We recently reported that histone modifications contribute to these changes. Histone modifications are regulated by a variety of histone modification enzymes. This study investigated the changes in gene expression of histone modification enzymes in rat GCs undergoing luteinization after the induction of ovulation. The extracellular regulated kinase (ERK)-1/2 is a mediator in the intracellular signaling pathway stimulated by the ovulatory LH surge and regulates the expression of a number of genes in GCs. We further investigated whether ERK-1/2 is involved in the regulation of the histone modification at the StAR promoter region in GCs undergoing luteinization.

Results: GCs were obtained from rats treated with equine chorionic gonadotropin (CG) before (0 h) and after human (h) CG injection. The expressions of 84 genes regulating histone modifications or DNA methylation were measured using a PCR array. Five genes (HDAC4, HDAC10, EZH2, SETDB2, and CIITA) were identified as histone acetylation- or histone methylation-related genes, and were significantly altered after hCG injection. None of the genes were related to DNA methylation. mRNA levels of EZH2, SETDB2, HDAC4, and HDAC10 decreased and CIITA mRNA levels increased 4 or 12 h after hCG injection. GCs isolated after eCG injection were incubated with hCG for 4 h to induce luteinization. StAR mRNA levels were significantly increased by hCG accompanied by the increase in H3K4me3 of the StAR promoter region. StAR mRNA expression was inhibited by the ERK inhibitor with the significant decrease of H3K4me3. These results suggest that hCG increases StAR gene expression through the ERK-1/2-mediated signaling which is also associated with histone modification of the promoter region.

Conclusions: Gene expressions of histone modification enzymes change in GCs undergoing luteinization after ovulation induction. This change may play important roles in regulating the expression of various genes during the early stage of luteinization, which may be critical for the subsequent corpus luteum formation.

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Decreased Expression of EZH2 in Granulosa Cells Contributes to Endometriosis-Associated Infertility by Targeting IL-1R2.

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C/EBPβ regulates Vegf gene expression in granulosa cells undergoing luteinization during ovulation in female rats.

Shinagawa M, Tamura I, Maekawa R, Sato S, Shirafuta Y, Mihara Y Sci Rep. 2019; 9(1):714.

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