title: Nox5 mediates PDGF-induced proliferation in human aortic smooth muscle cells.
abstract: The proliferation of vascular smooth muscle cells is important in the pathogenesis of many vascular diseases. Reactive oxygen species (ROS) produced by NADPH oxidases in smooth muscle cells have been shown to participate in signaling cascades regulating proliferation induced by platelet-derived growth factor (PDGF), a powerful smooth muscle mitogen. We sought to determine the role of Nox5 in the regulation of PDGF-stimulated human aortic smooth muscle cell (HASMC) proliferation. Cultured HASMC were found to express four isoforms of Nox5. When HASMC stimulated with PDGF were pretreated with N-acetyl cysteine (NAC), proliferation was significantly reduced. Proliferation induced by PDGF was also heavily dependent on JAK/STAT activation, as the JAK inhibitor, AG490, was able to completely abolish PDGF-stimulated HASMC growth. Specific knockdown of Nox5 with a siRNA strategy reduced PDGF-induced HASMC ROS production and proliferation. Additionally, siRNA to Nox5 inhibited PDGF-stimulated JAK2 and STAT3 phosphorylation. ROS produced by Nox5 play an important role in PDGF-induced JAK/STAT activation and HASMC proliferation.
authors.affiliation: Department of Medicine, Emory University, Atlanta, GA 30322, USA.
authors.forename: Desmond B
authors.initials: DB
authors.lastname: Jay
authors.forename: Christopher A
authors.initials: CA
authors.lastname: Papaharalambus
authors.forename: Bonnie
authors.initials: B
authors.lastname: Seidel-Rogol
authors.forename: Anna E
authors.initials: AE
authors.lastname: Dikalova
authors.forename: Bernard
authors.initials: B
authors.lastname: Lassègue
authors.forename: Kathy K
authors.initials: KK
authors.lastname: Griendling
mesh_terms: D001011:Aorta / Q000187:drug effects / Q000378:metabolism*; D015153:Blotting, Western; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D004791:Enzyme Inhibitors / Q000494:pharmacology; D006801:Humans; D053614:Janus Kinase 2 / Q000187:drug effects / Q000378:metabolism; D008565:Membrane Proteins / Q000187:drug effects / Q000378:metabolism*; D009131:Muscle, Smooth, Vascular / Q000378:metabolism*; D032389:Myocytes, Smooth Muscle / Q000187:drug effects / Q000378:metabolism*; D000074664:NADPH Oxidase 5; D019255:NADPH Oxidases / Q000187:drug effects / Q000378:metabolism*; D010766:Phosphorylation; D010982:Platelet-Derived Growth Factor / Q000187:drug effects / Q000378:metabolism*; D020033:Protein Isoforms / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism; D050796:STAT3 Transcription Factor / Q000187:drug effects / Q000378:metabolism; D014162:Transfection
chemical_list: D004791:Enzyme Inhibitors; D008565:Membrane Proteins; D010982:Platelet-Derived Growth Factor; D020033:Protein Isoforms; D017382:Reactive Oxygen Species; D050796:STAT3 Transcription Factor; D000074664:NADPH Oxidase 5; D019255:NADPH Oxidases; C431571:NOX5 protein, human; D053614:Janus Kinase 2