Differential Effects of Progesterone on COX-2 and Mn-SOD Expressions Are Associated with Histone Acetylation Status of the Promoter Region in Human Endometrial Stromal Cells

作者：Tamura Isao; Taketani Toshiaki; Lee Lifa; Kizuka Fumie; Taniguchi Ken; Maekawa Ryo; Asada Hiromi; Tamura Hiroshi; Sugino Norihiro^*

来源：Journal of Clinical Endocrinology & Metabolism, 2011, 96(7): E1073-E1082.

DOI：10.1210/jc.2010-2489

Context: Progesterone differently regulates TNF alpha-induced gene expression of cyclooxygenase-2 (COX-2) and manganese superoxide dismutase (Mn-SOD) in human endometrial stromal cells (ESC).
Objective: The present study investigated the mechanisms by which TNF alpha and progesterone affect the expressions of COX-2 and Mn-SOD in ESC.
Methods: ESC were incubated with TNF alpha and progesterone. COX-2 and Mn-SOD mRNA expression was determined by real-time RT-PCR. Nuclear factor (NF)-kappa B binding to the promoter region or histone acetylation status of the NF-kappa B response element was analyzed by a chromatin immunoprecipitation assay.
Results: TNF alpha increased COX-2 and Mn-SOD mRNA levels. Progesterone (10(-6) M) suppressed TNF alpha-induced COX-2 mRNA expression, whereas TNF alpha-induced Mn-SOD expression was not inhibited by progesterone. The inhibitory effect of progesterone was abolished by knockdown of progesterone receptors by small interfering RNA. Chromatin immunoprecipitation assay revealed that TNF alpha increased NF-kappa B binding at both the COX-2 promoter and the Mn-SOD enhancer and that progesterone inhibited only the NF-kappa B binding at the COX-2 promoter. The histone acetylation level of the NF-kappa B response element of the Mn-SOD enhancer was lower than that of the COX-2 promoter. However, when histone acetylation was induced by histone deacetylase inhibitors, progesterone inhibited the TNF alpha-induced NF-kappa B binding to the Mn-SOD enhancer.
Conclusions: TNF alpha increased COX-2 and Mn-SOD expression via NF-kappa B activation. Progesterone inhibited COX-2 expression by inhibiting the binding of NF-kappa B to its response element but did not inhibit TNF alpha-induced Mn-SOD expression. The gene-specific action of progesterone may be due to the difference in chromatin structure at the NF-kappa B response elements in the COX-2 promoter and Mn-SOD enhancer. (J Clin Endocrinol Metab 96: E1073-E1082, 2011)

• 出版日期2011-7