title: Regulation by DDAH/ADMA pathway of lipopolysaccharide-induced tissue factor expression in endothelial cells.
abstract: Previous studies have shown the regulatory effect of nitric oxide (NO) on endotoxin-induced tissue factor (TF) in endothelial cells. Asymmetric dimethylarginine (ADMA), a major endogenous NO synthase (NOS) inhibitor, could inhibit NO production in vivo and in vitro. ADMA and its major hydrolase dimethylarginine dimethylaminohydrolase (DDAH) have recently been thought of as a novel regulatory system of endogenous NO production. The aim of the present study was to determine whether the DDAH/ADMA pathway is involved in the effect of lipopolysaccharide (LPS) on TF expression in endothelial cells. Human umbilical vein endothelial cells (HUVECs) were treated with LPS (1 microg/ml) to induce TF expression. Exogenous ADMA significantly enhanced the increase in both TF mRNA level and activity induced by LPS, whereas L-arginine, the NOS substrate, markedly attenuated the LPS-induced TF increment. LPS markedly increased the level of ADMA in cultured medium and decreased DDAH activity in endothelial cells, and over-expression of DDAH2 could significantly suppress LPS-induced TF increment in endothelial cells. LPS could increase intracellular reactive oxygen species (ROS) production and activate nuclear factor-kappaB, which were enhanced by exogenous ADMA and attenuated by either L-arginine or overexpression of DDAH2. Therefore, our present results for the first time suggest that the DDAH/ADMA pathway can regulate LPS-induced TF expression via ROS-nuclear factor-kappaB-dependent pathway in endothelial cells.
authors.affiliation: Department of Hematology, Xiangya Hospital of Central South University, Xiang-Ya Road # 87, Changsha 410008, China.
authors.forename: Hong-Ya
authors.initials: HY
authors.lastname: Xin
authors.forename: De-Jian
authors.initials: DJ
authors.lastname: Jiang
authors.forename: Su-Jie
authors.initials: SJ
authors.lastname: Jia
authors.forename: Kui
authors.initials: K
authors.lastname: Song
authors.forename: Guang-Ping
authors.initials: GP
authors.lastname: Wang
authors.forename: Yuan-Jian
authors.initials: YJ
authors.lastname: Li
authors.forename: Fang-Ping
authors.initials: FP
authors.lastname: Chen
mesh_terms: D000581:Amidohydrolases / Q000235:genetics / Q000378:metabolism*; D001120:Arginine / Q000031:analogs & derivatives* / Q000378:metabolism / Q000494:pharmacology; D001483:Base Sequence; D002478:Cells, Cultured; D017931:DNA Primers / Q000235:genetics; D042783:Endothelial Cells / Q000187:drug effects* / Q000378:metabolism*; D015870:Gene Expression / Q000187:drug effects; D006801:Humans; D008070:Lipopolysaccharides / Q000494:pharmacology*; D016328:NF-kappa B / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism; D013925:Thromboplastin / Q000235:genetics* / Q000378:metabolism*
chemical_list: D017931:DNA Primers; D008070:Lipopolysaccharides; D016328:NF-kappa B; D012333:RNA, Messenger; D017382:Reactive Oxygen Species; C018524:N,N-dimethylarginine; D013925:Thromboplastin; D001120:Arginine; D000581:Amidohydrolases; C059999:dimethylargininase