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Progesterone increases manganese superoxide dismutase expression via a cAMP-dependent signaling mediated by noncanonical Wnt5a pathway in human endometrial stromal cells


Progesterone increases manganese superoxide dismutase expression via a cAMP-dependent signaling mediated by noncanonical Wnt5a pathway in human endometrial stromal cells



Journal of Clinical Endocrinology and Metabolism 95(11): E291-E299



ISSN/ISBN: 0021-972X

PMID: 20685861

DOI: 10.1210/jc.2010-0619

Manganese superoxide dismutase (Mn-SOD), an antioxidant enzyme in the mitochondria, protects cells by scavenging superoxide radicals in human endometrial stromal cells (ESCs). Mn-SOD increases in ESCs during decidualization induced by progesterone. The present study investigated the molecular mechanism for Mn-SOD expression induced by progesterone in human ESCs. ESCs were incubated with medroxyprogesterone acetate (MPA; 10(-6) m) or dibutyryl-cAMP (0.5 mm) for 17 d. To determine whether a cAMP-dependent signaling pathway is involved in the MPA-induced Mn-SOD expression, ESCs were treated with H89, an inhibitor of cAMP-dependent protein kinase A. A chromatin immunoprecipitation assay was performed to examine the binding of cAMP-binding protein to the cAMP-response element on the Mn-SOD gene promoter. To examine the involvement of Wnt5a signaling, anti-Wnt5a antibodies were used to neutralize the Wnt5a activities. Mn-SOD and Wnt5a mRNA levels and intracellular cAMP concentrations were significantly increased by MPA. These increases were accompanied by an increase in the mRNA expression of IGF-binding protein-1, a marker of decidualization. The increase in Mn-SOD mRNA levels by MPA or dibutyryl-cAMP was completely inhibited by H89. The chromatin immunoprecipitation assay revealed that MPA induced cAMP-binding protein binding with cAMP-response element on the Mn-SOD gene promoter. The increase in intracellular cAMP concentrations by MPA was completely inhibited by treatment with anti-Wnt5a antibodies. MPA treatment had no effects on β-catenin expression. Progesterone increased Mn-SOD expression via a cAMP-dependent pathway in ESCs during decidualization. cAMP-dependent signaling stimulated by progesterone is mediated by noncanonical Wnt5a pathways that signal independently of β-catenin.

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Accession: 055207607

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