Cited by 24Nitric Oxide and Endothelin EffectsNeutrophil, Myeloperoxidase and Oxidative MechanismsRedox biology and oxidative stress

Knockout of p47 phox Uncovers a Critical Role of p40 phox in Reactive Oxygen Species Production in Microvascular Endothelial Cells

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Fan, Lampson M., Teng, Lei, Li, Jian-Mei·2009·Arteriosclerosis, Thrombosis, and Vascular Biology

Abstract

Objective— p40 phox is an important regulatory subunit of NADPH oxidase, but its role in endothelial reactive oxygen species (ROS) production remains unknown. Methods and Results— Using coronary microvascular endothelial cells isolated from wild-type and p47 phox knockout mice, we found that knockout of p47 phox increased the level of p40 phox expression, whereas depletion of p40 phox in wild-type cells increased p47 phox expression. In both cases, the basal ROS production (without agonist stimulation) was well preserved. Double knockout of p40 phox and p47 phox dramatically reduced (≈65%) ROS production and cells started to die. The transcriptional regulation of p40 phox and p47 phox expressions involves HBP1. p40 phox was prephosphorylated in resting cells. PMA stimulation induced p40 phox swift dephosphorylation (within 1 minute) in parallel with the start of p47 phox phosphorylation. p40 phox was then rephosphorylated, and this was accompanied with an increase in ROS production. Depletion of p40 phox resulted in ≈67% loss in agonist-induced ROS production despite the presence of p47 phox . These were further supported by experiments on mouse aortas stimulated with angiotensin II. Conclusion— p40 phox is prephosphorylated in resting endothelial cells and can compensate p47 phox in keeping basal ROS production. Dephosphorylation of p40 phox is a prerequisite for agonist-induced p47 phox phosphorylation, and p40 phox through its dynamic dephosphorylation and rephosphorylation is involved in the regulation of agonist-induced ROS production.

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Authors
Fan, L. M., Teng, L., & Li, J.-M.
Affiliations
University of Surrey (GB)
Venue
Arteriosclerosis, Thrombosis, and Vascular Biology
Published
2009-10
Volume
29
Issue
10
Pages
1651-1656
ISSN
  • 1079-5642 (ISSN-L)
  • 1524-4636
OpenAlex
W2102340898
Cited by
24
References
31
Citations by year
2021: 1 · 2018: 1 · 2017: 1 · 2016: 1 · 2015: 2 · 2014: 6 · 2013: 3 · 2012: 4
FWCI
1.99
Type
journal article
Language
en
Open access
Locations
  • Arteriosclerosis Thrombosis and Vascular Biology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • Surrey Research Insight Open Access (The University of Surrey) (submittedVersion)
  • Open Research (University of Surrey) (submittedVersion)
Funders
  • Wellcome Trust (078637, 07863/Z/05/Z)
  • Biotechnology and Biological Sciences Research Council (BB/D009510/1)
Topics
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Life Sciences › Immunology and Microbiology › Immunology › Neutrophil, Myeloperoxidase and Oxidative Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
Keywords
p40phox, p47phox, NADPH oxidase, reactive oxygen species, microvascular endothelial cells, HBP1, protein phosphorylation, dephosphorylation, angiotensin II, coronary endothelium
MeSH terms
Angiotensin II, Animals, Cells, Cultured, Coronary Vessels, High Mobility Group Proteins, Microcirculation, Phosphoproteins, Phosphorylation, Repressor Proteins, RNA, Messenger, Tetradecanoylphorbol Acetate, Reactive Oxygen Species, Mice, Knockout, NADPH Oxidases, Endothelial Cells, Cell Proliferation, Mice

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