Cited by 36Nitric Oxide and Endothelin EffectsIon channel regulation and functionRedox biology and oxidative stress

Upregulation of Intermediate-Conductance Ca2+-Activated K+ Channels (KCNN4) in Porcine Coronary Smooth Muscle Requires NADPH Oxidase 5 (NOX5)

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Gole, Hope K. A., Tharp, Darla L., Bowles, Douglas K.·2014·PLoS ONE

Abstract

AIMS: NADPH oxidase (NOX) is the primary source of reactive oxygen species (ROS) in vascular smooth muscle cells (SMC) and is proposed to play a key role in redox signaling involved in the pathogenesis of cardiovascular disease. Growth factors and cytokines stimulate coronary SMC (CSMC) phenotypic modulation, proliferation, and migration during atherosclerotic plaque development and restenosis. We previously demonstrated that increased expression and activity of intermediate-conductance Ca(2+)-activated K(+) channels (KCNN4) is necessary for CSMC phenotypic modulation and progression of stenotic lesions. Therefore, the purpose of this study was to determine whether NOX is required for KCNN4 upregulation induced by mitogenic growth factors. METHODS AND RESULTS: Dihydroethidium micro-fluorography in porcine CSMCs demonstrated that basic fibroblast growth factor (bFGF) increased superoxide production, which was blocked by the NOX inhibitor apocynin (Apo). Apo also blocked bFGF-induced increases in KCNN4 mRNA levels in both right coronary artery sections and CSMCs. Similarly, immunohistochemistry and whole cell voltage clamp showed bFGF-induced increases in CSMC KCNN4 protein expression and channel activity were abolished by Apo. Treatment with Apo also inhibited bFGF-induced increases in activator protein-1 promoter activity, as measured by luciferase activity assay. qRT-PCR demonstrated porcine coronary smooth muscle expression of NOX1, NOX2, NOX4, and NOX5 isoforms. Knockdown of NOX5 alone prevented both bFGF-induced upregulation of KCNN4 mRNA and CSMC migration. CONCLUSIONS: Our findings provide novel evidence that NOX5-derived ROS increase functional expression of KCNN4 through activator protein-1, providing another potential link between NOX, CSMC phenotypic modulation, and atherosclerosis.

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Authors
Gole, H. K. A., Tharp, D. L., & Bowles, D. K.
Affiliations
University of Missouri (US)
Corresponding author
Bowles, Douglas K.
Venue
PLoS ONE
Published
2014-08-21
Volume
9
Issue
8
Pages
e105337
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2003776935
Cited by
36
References
101
Citations by year
2026: 3 · 2025: 1 · 2024: 3 · 2023: 2 · 2022: 3 · 2021: 6 · 2020: 4 · 2019: 2 · 2018: 4 · 2017: 3 · 2016: 1 · 2015: 4
FWCI
1.77
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Institutes of Health (RR1 8276, HL-52490)
  • National Heart, Lung, and Blood Institute (HL-52490, P01HL052490)
  • National Center for Research Resources (R24RR018276, RR-18276)
Topics
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
Keywords
KCNN4, NADPH oxidase 5, coronary artery smooth muscle cells, reactive oxygen species, superoxide, basic fibroblast growth factor, apocynin, activator protein-1, atherosclerosis, restenosis, smooth muscle cell migration, redox signaling
MeSH terms
Animals, Cell Movement, Cells, Cultured, Coronary Vessels, Gene Expression Regulation, Isoenzymes, Muscle, Smooth, Vascular, RNA, Messenger, Swine, Up-Regulation, Gene Expression, Fibroblast Growth Factor 2, Reactive Oxygen Species, Transcription Factor AP-1, NADPH Oxidases, Potassium Channels, Calcium-Activated, Gene Knockdown Techniques

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