Gram-Negative Bacterial Lipopolysaccharide Stimulates Activin A Secretion from Human Amniotic Epithelial Cells. (17th July 2013)

• Record Type: Journal Article
• Authors: Abe, Yumiko; Marukawa, Risa; Tsuru, Nami; Sato, Maki; Matsuda, Hiroko; Sadakata, Hisanobu; Kameda, Takashi; Minegishi, Takashi
• Other Names: Dufau Maria L. Academic Editor.
• Is Part Of: International journal of endocrinology. Volume 2013(2013)
• Publication Date: 2013-07-17
• Subjects: Endocrinology -- Periodicals; Endocrinology; Endocrinology -- Periodicals; Endocrine System Diseases -- Periodicals; Periodicals; 616.4
• DOI: 10.1155/2013/789012
• Languages: English
• ISSNs: 1687-8337

Abstract

Abstract : Activin A is involved in inflammation. The present study was performed to clarify if lipopolysaccharide, a component of Gram-negative bacteria, stimulates activin A secretion from human amniotic epithelial cells and to determine if activin A plays a role in amnionitis. Fetal membranes were obtained during elective cesarean sections performed in full-term pregnancies of patients without systemic disease, signs of premature delivery, or fetal complications. Amniotic epithelial cells were isolated by trypsinization. The activin A concentrations in the culture media were measured by enzyme-linked immunosorbent assay, and cell proliferation was assessed by 5-bromo-2′-deoxyuridine incorporation. Amniotic epithelial cells secreted activin A in a cell density-dependent manner, and lipopolysaccharide (10 μ g/mL) enhanced the secretion at each cell density. Lipopolysaccharide (10–50 μ g/mL) also stimulated activin A secretion in a dose-dependent manner. Contrary to the effect of activin A secretion, lipopolysaccharide inhibited cell proliferation in amniotic epithelial cells. The present study suggests that lipopolysaccharide stimulation of activin A secretion may be a mechanism in the pathogenesis of amnionitis.