title: Inhibitory effect of activin A on activation of lipopolysaccharide-stimulated mouse macrophage RAW264.7 cells.
abstract: Activin A is a member of transforming growth factor beta (TGF-beta) superfamily, which is also named restrictin-P, and can inhibit the secretion of nitric oxide (NO) and interleukin-1beta (IL-1beta) from LPS-activated mouse macrophages. In this study, the regulation effect and possible mechanism of activin A as an anti-inflammatory factor on lipopolysaccharide (LPS)-activated macrophages were investigated in vitro. It was observed that activin A could not only decrease the secretion of IL-1beta and NO, as well as the mRNA expressions of IL-1beta and iNOS, but also suppress the pinocytosis of mouse macrophage cell line RAW264.7 cells induced by LPS. In addition, activin A could obviously reduce the expressions of CD68 and CD14, as well as Toll-like receptor 4 (TLR4) on RAW264.7 cells induced by LPS, but could not influence the proliferation of RAW264.7 cells. These findings suggest that activin A may play an important down-regulation role in inflammatory factor production and phagocytosis of the activated macrophages via suppressing the maturation of LPS-induced macrophages or LPS-TLR4 signal transduction.
authors.affiliation: Department of Immunology, School of Basic Medical Sciences, Jilin University, 126 Xinmin Street, Changchun, Jilin 130021, China.
authors.forename: Shi-Yao
authors.initials: SY
authors.lastname: Wang
authors.forename: Gui-Xiang
authors.initials: GX
authors.lastname: Tai
authors.forename: Peng-Yu
authors.initials: PY
authors.lastname: Zhang
authors.forename: Da-Peng
authors.initials: DP
authors.lastname: Mu
authors.forename: Xue-Jun
authors.initials: XJ
authors.lastname: Zhang
authors.forename: Zhong-Hui
authors.initials: ZH
authors.lastname: Liu
mesh_terms: D028341:Activins / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D015703:Antigens, CD / Q000276:immunology; D015214:Antigens, Differentiation, Myelomonocytic / Q000276:immunology; D002460:Cell Line; D049109:Cell Proliferation; D006801:Humans; D053583:Interleukin-1beta / Q000276:immunology; D018950:Lipopolysaccharide Receptors / Q000276:immunology; D008070:Lipopolysaccharides / Q000276:immunology*; D008262:Macrophage Activation; D008264:Macrophages / Q000166:cytology / Q000378:metabolism*; D051379:Mice; D009569:Nitric Oxide / Q000378:metabolism; D052247:Nitric Oxide Synthase Type II / Q000276:immunology; D010873:Pinocytosis / Q000502:physiology; D015398:Signal Transduction / Q000502:physiology; D000097382:CD68 Molecule
chemical_list: D028341:Activins; D015703:Antigens, CD; D015214:Antigens, Differentiation, Myelomonocytic; D053583:Interleukin-1beta; D018950:Lipopolysaccharide Receptors; D008070:Lipopolysaccharides; D009569:Nitric Oxide; D052247:Nitric Oxide Synthase Type II; C081026:CD68 protein, mouse; D000097382:CD68 Molecule; C422405:activin A; C496317:Nos2 protein, mouse