Document Detail


Differential regulation of Nox1, Nox2 and Nox4 in vascular smooth muscle cells from WKY and SHR.
MedLine Citation:
PMID:  21419746     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The functional significance and regulation of NAD(P)H oxidase (Nox) isoforms by angiotensin II (Ang II) and endothelin-1 (ET-1) in vascular smooth muscle cells (VSMCs) from normotensive Wistar-Kyoto (WKY) and spontaneously hypertensive rats (SHR) was studied. Expression of Nox1, Nox2, and Nox4 (gene and protein) and NAD(P)H oxidase activity were increased in SHR. Basal NAD(P)H oxidase activity was blocked by GKT136901 (Nox1/4 inhibitor) and by Nox1 siRNA in WKY cells and by siNOX1 and siNOX2 in SHR. Whereas Ang II increased expression of all Noxes in WKY, only Nox1 was influenced in SHR. Ang II-induced NAD(P)H activity was inhibited by siNOX1 in WKY and by siNOX1 and siNOX2 in SHR. ET-1 upregulated Nox expression only in WKY and increased NAD(P)H oxidase activity, an effect inhibited by siNOX1 and siNOX2. Nox1 co-localized with Nox2 but not with Nox4, implicating association between Nox1 and Nox2 but not between Nox1 and Nox4. These data highlight the complexity of Nox biology in VSMCs, emphasising that more than one Nox member, alone or in association, may be involved in NAD(P)H oxidase-mediated •O(2)(-) production. Nox1 regulation by Ang II, but not by ET-1, may be important in •O(2)(-) formation in VSMCs from SHR.
Authors:
Ana M Briones; Fatiha Tabet; Glaucia E Callera; Augusto C Montezano; Alvaro Yogi; Ying He; Mark T Quinn; Mercedes Salaices; Rhian M Touyz
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-3-16
Journal Detail:
Title:  Journal of the American Society of Hypertension : JASH     Volume:  -     ISSN:  1933-1711     ISO Abbreviation:  -     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-3-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101312518     Medline TA:  J Am Soc Hypertens     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 American Society of Hypertension. Published by Elsevier Inc. All rights reserved.
Affiliation:
Kidney Research Centre, Ottawa Health Research Institute, University of Ottawa, Ontario, Canada; Department Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Spain.
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