Novel gp91(phox) homologues in vascular smooth muscle cells: nox1 mediates angiotensin II-induced superoxide formation and redox-sensitive signaling pathways
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Novel gp91(phox) homologues in vascular smooth muscle cells: nox1 mediates angiotensin II-induced superoxide formation and redox-sensitive signaling pathways. / Lassègue, B; Sorescu, D; Szöcs, K; Yin, Q; Akers, M; Zhang, Y; Grant, S L; Lambeth, J D; Griendling, K K.
in: CIRC RES, Jahrgang 88, Nr. 9, 11.05.2001, S. 888-894.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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T1 - Novel gp91(phox) homologues in vascular smooth muscle cells: nox1 mediates angiotensin II-induced superoxide formation and redox-sensitive signaling pathways
AU - Lassègue, B
AU - Sorescu, D
AU - Szöcs, K
AU - Yin, Q
AU - Akers, M
AU - Zhang, Y
AU - Grant, S L
AU - Lambeth, J D
AU - Griendling, K K
PY - 2001/5/11
Y1 - 2001/5/11
N2 - Emerging evidence indicates that reactive oxygen species are important regulators of vascular function. Although NAD(P)H oxidases have been implicated as major sources of superoxide in the vessel wall, the molecular identity of these proteins remains unclear. We recently cloned nox1 (formerly mox-1), a member of a new family of gp91(phox) homologues, and showed that it is expressed in proliferating vascular smooth muscle cells (VSMCs). In this study, we examined the expression of three nox family members, nox1, nox4, and gp91(phox), in VSMCs, their regulation by angiotensin II (Ang II), and their role in redox-sensitive signaling. We found that both nox1 and nox4 are expressed to a much higher degree than gp91(phox) in VSMCS: Although serum, platelet-derived growth factor (PDGF), and Ang II downregulated nox4, they markedly upregulated nox1, suggesting that this enzyme may account for the delayed phase of superoxide production in these cells. Furthermore, an adenovirus expressing antisense nox1 mRNA completely inhibited the early phase of superoxide production induced by Ang II or PDGF and significantly decreased activation of the redox-sensitive signaling molecules p38 mitogen-activated protein kinase and Akt by Ang II. In contrast, redox-independent pathways induced by PDGF or Ang II were unaffected. These data support a role for nox1 in redox signaling in VSMCs and provide insight into the molecular identity of the VSMC NAD(P)H oxidase and its potentially critical role in vascular disease.
AB - Emerging evidence indicates that reactive oxygen species are important regulators of vascular function. Although NAD(P)H oxidases have been implicated as major sources of superoxide in the vessel wall, the molecular identity of these proteins remains unclear. We recently cloned nox1 (formerly mox-1), a member of a new family of gp91(phox) homologues, and showed that it is expressed in proliferating vascular smooth muscle cells (VSMCs). In this study, we examined the expression of three nox family members, nox1, nox4, and gp91(phox), in VSMCs, their regulation by angiotensin II (Ang II), and their role in redox-sensitive signaling. We found that both nox1 and nox4 are expressed to a much higher degree than gp91(phox) in VSMCS: Although serum, platelet-derived growth factor (PDGF), and Ang II downregulated nox4, they markedly upregulated nox1, suggesting that this enzyme may account for the delayed phase of superoxide production in these cells. Furthermore, an adenovirus expressing antisense nox1 mRNA completely inhibited the early phase of superoxide production induced by Ang II or PDGF and significantly decreased activation of the redox-sensitive signaling molecules p38 mitogen-activated protein kinase and Akt by Ang II. In contrast, redox-independent pathways induced by PDGF or Ang II were unaffected. These data support a role for nox1 in redox signaling in VSMCs and provide insight into the molecular identity of the VSMC NAD(P)H oxidase and its potentially critical role in vascular disease.
KW - Animals
KW - Blotting, Northern
KW - Cell Line
KW - Cells, Cultured
KW - DNA, Antisense/genetics
KW - DNA, Complementary/chemistry
KW - Dose-Response Relationship, Drug
KW - Enzyme Inhibitors/pharmacology
KW - Gene Expression
KW - Gene Expression Regulation/drug effects
KW - Indoles/pharmacology
KW - Maleimides/pharmacology
KW - Membrane Glycoproteins/genetics
KW - Molecular Sequence Data
KW - Muscle, Smooth, Vascular/cytology
KW - NADH, NADPH Oxidoreductases/genetics
KW - NADPH Oxidase 1
KW - NADPH Oxidase 2
KW - NADPH Oxidase 4
KW - NADPH Oxidases/genetics
KW - Oxidation-Reduction
KW - Platelet-Derived Growth Factor/pharmacology
KW - Protein Kinase C/antagonists & inhibitors
KW - RNA, Messenger/drug effects
KW - Rats
KW - Sequence Analysis, DNA
KW - Signal Transduction
KW - Superoxides/metabolism
KW - Time Factors
U2 - 10.1161/hh0901.090299
DO - 10.1161/hh0901.090299
M3 - SCORING: Journal article
C2 - 11348997
VL - 88
SP - 888
EP - 894
JO - CIRC RES
JF - CIRC RES
SN - 0009-7330
IS - 9
ER -