Cited by 55Redox biology and oxidative stressProtein Kinase Regulation and GTPase SignalingNeutrophil, Myeloperoxidase and Oxidative Mechanisms

Molecular regulation of NADPH oxidase 5 via the MAPK pathway

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Pandey, D., Fulton, D. J. R.·2011·American Journal of Physiology-Heart and Circulatory Physiology

Abstract

The mechanisms controlling the activity of NADPH oxidase 5 (Nox5) are unique in that they are independent of the protein: protein interactions that coordinate the activation of other Nox isoforms. Instead, the primary driving force for Nox5 activity is calcium. However, in a previous study we reported that the protein kinase C (PKC)-agonist PMA could induce a sustained activation of Nox5 that was independent of calcium changes. This apparent calcium-independent activation was found to be mediated by the PKC-dependent phosphorylation of specific serine and threonine residues on Nox5 which increased the calcium sensitivity of the enzyme and enabled activation at resting levels of calcium. However, the specific kinase(s) mediating the phosphorylation and activation of Nox5 are not known. As PKC can activate the MEK/ERK1/2 signaling pathway, we hypothesized that Nox5 is activated by the coordinated phosphorylation of both MAPK and PKC pathways. The inhibition of MEK1 using PD-98059 and U-0126 significantly reduced the phosphorylation and activity of Nox5 in response to PMA but not to the calcium-mobilizing stimulus ionomycin. Dominant negative MEK1 and knockdown of endogenous MEK1/2 using a specific small interfering RNA also inhibited Nox5 activity in response to PMA. The mutation of S498 to a nonphosphorylatable residue and to a lesser degree T494 blocked the ability of ERK to stimulate Nox5 activity. However, a constitutively active form of MEK1 failed to increase Nox5 activity in the absence of PMA stimulation. These results suggest that the MEK/ERK1/2 pathway is necessary but not sufficient to regulate the PMA-dependent activation of Nox5.

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Crossref · 10.1152/ajpheart.01163.2010

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  1. [12]12. Cheng G, Ritsick D, Lambeth JD. Nox3 regulation by NOXO1, p47phox, and p67phox. J Biol Chem 279: 34250– 34255, 2004 [DOI] [PubMed] [Google Scholar]

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Authors
Pandey, D., & Fulton, D. J. R.
Affiliations
  • Center for Vascular Biology Research (US)
  • Augusta University (US)
Corresponding author
Fulton, D. J. R.
Venue
American Journal of Physiology-Heart and Circulatory Physiology
Published
2011-04
Volume
300
Issue
4
Pages
H1336-H1344
ISSN
  • 0363-6135 (ISSN-L)
  • 1522-1539
OpenAlex
W2132021477
Cited by
55
References
50
Citations by year
2026: 1 · 2025: 1 · 2023: 2 · 2022: 2 · 2021: 4 · 2020: 5 · 2019: 6 · 2018: 3 · 2017: 3 · 2016: 3 · 2015: 7 · 2014: 6 · 2013: 3 · 2012: 7
FWCI
2.33
Type
journal article
Language
en
Open access
Locations
  • American Journal of Physiology-Heart and Circulatory Physiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Heart, Lung, and Blood Institute (R01HL085827, HL092446, HL 085827, R01HL092446)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Life Sciences › Immunology and Microbiology › Immunology › Neutrophil, Myeloperoxidase and Oxidative Mechanisms
Keywords
NADPH oxidase 5, MAPK signaling, MEK/ERK1/2 pathway, protein kinase C, PMA, protein phosphorylation, calcium-independent activation, calcium sensitivity, MEK1, ERK, oxidative stress, cardiomyocytes
MeSH terms
NADPH Oxidase 5, Butadienes, Calcium, Cell Line, Enzyme Inhibitors, Flavonoids, Humans, Ionophores, Membrane Proteins, Nitriles, Phorbols, Phosphorylation, Protein Kinase C, Ionomycin, NADPH Oxidases, Mitogen-Activated Protein Kinases, RNA, Small Interfering, MAP Kinase Kinase 1, MAP Kinase Kinase 2

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