Cited by 96Nitric Oxide and Endothelin EffectsRedox biology and oxidative stressRenin-Angiotensin System Studies

Mitochondrial-localized NADPH oxidase 4 is a source of superoxide in angiotensin II-stimulated neurons

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Case, Adam J., Li, Shumin, Basu, Urmi, Tian, Jun, Zimmerman, Matthew C.·2013·American Journal of Physiology-Heart and Circulatory Physiology

Abstract

Angiotensin II (ANG II) plays an important role in the central regulation of systemic cardiovascular function. ANG II-mediated intraneuronal signaling has been shown to be predicated by an increase in mitochondrial superoxide (O 2˙−), yet the source of this reactive oxygen species (ROS) production remains unclear. NADPH oxidase 4 (Nox4), a member of the NADPH oxidase family, has been reported to be localized in mitochondria of various cell types and has been implicated in brain angiotensinergic signaling. However, the subcellular localization and function of Nox4 in neurons has not been fully elucidated. In this study, we hypothesized that Nox4 is expressed in neuron mitochondria and is involved in ANG II-dependent O 2˙−-mediated intraneuronal signaling. To query this, Nox4 immunofluorescent staining and mitochondrial enrichment were performed in a mouse catecholaminergic neuronal cell model (CATH.a). Nox4 was shown to be present in neuron mitochondria as evidenced by colocalization with both the mitochondrial-localized protein manganese superoxide dismutase (MnSOD) and dye MitoTracker Red. Moreover, Nox4 expression was significantly increased in enriched mitochondrial fractions compared with whole cell lysates. Additionally, adenoviral-encoded small interfering RNA for Nox4 (AdsiNox4) caused a robust knockdown in Nox4 mRNA and protein levels, which led to the attenuation of ANG II-induced mitochondrial O 2˙− production. Finally, in the subfornical organ (SFO) of the brain, Nox4 not only demonstrated mitochondrial localization but was induced by chronic, peripheral infusion of ANG II. Collectively, these data suggest that Nox4 is a source of O 2˙− in neuron mitochondria that contributes to ANG II intraneuronal signaling.

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Crossref · 10.1152/ajpheart.00974.2012

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  • NOX4 has been reported to be localized within the mitochondrion either constitutively or in specific pathological conditions, although controversial.

    “Additionally, although controversial, NOX4 has been reported to be localized within the mitochondrion either constitutively or in specific pathological conditions (152, 306, 540).”

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Research works printed but not linked: 2

  1. [19]19. Lindley TE, Doobay MF, Davisson RL. Redox signaling is involved in central activation and sympathoexcitation during heart failure. FASEB J: A401, 2003 [DOI] [PubMed] [Google Scholar]
  2. [37]37. Yin JX, Yang RF, Li S, Renshaw AO, Li YL, Schultz HD, Zimmerman MC. Mitochondria-produced superoxide mediates angiotensin II-induced inhibition of neuronal potassium current. Am J Physiol Cell Physiol 298: C857–C865, 2010 [DOI] [PMC free article] [PubMed] [Google Scholar]

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Authors
Case, A. J., Li, S., Basu, U., Tian, J., & Zimmerman, M. C.
Affiliations
  • University of Nebraska Medical Center (US)
  • University of Nebraska–Lincoln (US)
Corresponding author
Zimmerman, Matthew C.
Venue
American Journal of Physiology-Heart and Circulatory Physiology
Published
2013-07-01
Volume
305
Issue
1
Pages
H19-H28
ISSN
  • 0363-6135 (ISSN-L)
  • 1522-1539
OpenAlex
W2077983561
Cited by
96
References
41
Citations by year
2026: 2 · 2025: 2 · 2024: 3 · 2023: 3 · 2022: 4 · 2021: 11 · 2020: 11 · 2019: 7 · 2018: 9 · 2017: 12 · 2016: 7 · 2015: 12 · 2014: 8 · 2013: 5
FWCI
7.43
Type
journal article
Language
en
Open access
Locations
  • American Journal of Physiology-Heart and Circulatory Physiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Heart, Lung, and Blood Institute (R01HL103942)
  • National Center for Research Resources (P20RR017675)
Topics
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Renin-Angiotensin System Studies
Keywords
NOX4, angiotensin II, mitochondrial superoxide, reactive oxygen species, subfornical organ, catecholaminergic neurons, manganese superoxide dismutase, cardiovascular regulation
MeSH terms
NADPH Oxidase 4, Angiotensin II, Animals, Cell Line, Mice, Inbred C57BL, Mitochondria, Neurons, Superoxides, Superoxide Dismutase, Signal Transduction, Gene Expression, NADPH Oxidases, RNA, Small Interfering, Mice

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