Cited by 786Cardiac Fibrosis and RemodelingTGF-β signaling in diseasesNitric Oxide and Endothelin Effects

NAD(P)H Oxidase 4 Mediates Transforming Growth Factor-β1–Induced Differentiation of Cardiac Fibroblasts Into Myofibroblasts

Cucoranu, Ioan, Clempus, Roza, Dikalova, Anna, Phelan, Patrick J., Ariyan, Srividya, Dikalov, Sergey, Sorescu, Dan·2005·Circulation Research

Abstract

Human cardiac fibroblasts are the main source of cardiac fibrosis associated with cardiac hypertrophy and heart failure. Transforming growth factor-β1 (TGF-β1) irreversibly converts fibroblasts into pathological myofibroblasts, which express smooth muscle α-actin (SM α-actin) de novo and produce extracellular matrix. We hypothesized that TGF-β1–stimulated conversion of fibroblasts to myofibroblasts requires reactive oxygen species derived from NAD(P)H oxidases (Nox). We found that TGF-β1 potently upregulates the contractile marker SM α-actin mRNA (7.5±0.8-fold versus control). To determine whether Nox enzymes are involved, we first performed quantitative real time polymerase chain reaction and found that Nox5 and Nox4 are abundantly expressed in cardiac fibroblasts, whereas Nox1 and Nox2 are barely detectable. On stimulation with TGF-β1, Nox4 mRNA is dramatically upregulated by 16.2±0.8-fold (n=3, P <0.005), whereas Nox5 is downregulated. Small interference RNA against Nox4 downregulates Nox4 mRNA by 80±5%, inhibits NADPH-driven superoxide production in response to TGF-β1 by 65±7%, and reduces TGF-β1–induced expression of SM α-actin by 95±2% (n=6, P <0.05). Because activation of small mothers against decapentaplegic (Smads) 2/3 is critical for myofibroblast conversion in response to TGF-β1, we also determined whether Nox4 affects Smad 2/3 phosphorylation. Depletion of Nox4 but not Nox5 inhibits baseline and TGF-β1 stimulation of Smad 2/3 phosphorylation by 75±5% and 68±3%, respectively (n=7, P <0.0001). We conclude that Nox 4 mediates TGF-β1–induced conversion of fibroblasts to myofibroblasts by regulating Smad 2/3 activation. Thus, Nox4 may play a critical role in the pathological activation of cardiac fibroblasts in cardiac fibrosis associated with human heart failure.

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Crossref · 10.1161/01.res.0000187457.24338.3d

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Research works printed but not linked: 2

  1. Keith M, Geranmayegan A, Sole MJ, Kurian R, Robinson A, Omran AS, Jeejeebhoy KN. Increased oxidative stress in patients with congestive heart failure. J Am Coll Cardiol. 1998;31:1352-1356.
  2. Cross AR, Parkinson JF, Jones OTG. The superoxide-generating oxidase of leucocytes. Biochem J. 1984;223:337-344.

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Authors
Cucoranu, I., Clempus, R., Dikalova, A., Phelan, P. J., Ariyan, S., Dikalov, S., & Sorescu, D.
Affiliations
Emory University (US)
Venue
Circulation Research
Published
2005-10-28
Volume
97
Issue
9
Pages
900-907
ISSN
  • 0009-7330 (ISSN-L)
  • 1524-4571
OpenAlex
W2162514162
Cited by
786
References
41
Citations by year
2026: 24 · 2025: 17 · 2024: 19 · 2023: 39 · 2022: 47 · 2021: 35 · 2020: 39 · 2019: 33 · 2018: 42 · 2017: 47 · 2016: 44 · 2015: 52 · 2014: 51 · 2013: 54 · 2012: 52
FWCI
18.50
Type
journal article
Language
en
Open access
closed
Locations
  • Circulation Research (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • American Heart Association
  • National Institutes of Health
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac Fibrosis and Remodeling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › TGF-β signaling in diseases
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
Keywords
NOX4, cardiac fibroblasts, myofibroblast differentiation, TGF-β1, myocardial fibrosis, smooth muscle actin, reactive oxygen species, superoxide, Smad2/3 phosphorylation, heart failure, cardiac hypertrophy, extracellular matrix
MeSH terms
NADPH Oxidase 4, Actins, Cell Differentiation, Cells, Cultured, Fibroblasts, Fibrosis, Humans, Myocardium, RNA, Messenger, Superoxides, Transforming Growth Factor beta, Reactive Oxygen Species, Immediate-Early Proteins, NADPH Oxidases, Intercellular Signaling Peptides and Proteins, Smad2 Protein, Smad3 Protein, Transforming Growth Factor beta1, Connective Tissue Growth Factor

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