Cited by 31Nitric Oxide and Endothelin EffectsMitochondrial Function and PathologyHemoglobin structure and function

Relative sensitivity of soluble guanylate cyclase and mitochondrial respiration to endogenous nitric oxide at physiological oxygen concentration

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Rodríguez-Juárez, Félix, Aguirre, Enara, Cadenas, Susana·2007·Biochemical Journal

Abstract

Nitric oxide (NO) is a widespread biological messenger that has many physiological and pathophysiological roles. Most of the physiological actions of NO are mediated through the activation of sGC (soluble guanylate cyclase) and the subsequent production of cGMP. NO also binds to the binuclear centre of COX (cytochrome c oxidase) and inhibits mitochondrial respiration in competition with oxygen and in a reversible manner. Although sGC is more sensitive to endogenous NO than COX at atmospheric oxygen tension, the more relevant question is which enzyme is more sensitive at physiological oxygen concentration. Using a system in which NO is generated inside the cells in a finely controlled manner, we determined cGMP accumulation by immunoassay and mitochondrial oxygen consumption by high-resolution respirometry at 30 μM oxygen. In the present paper, we report that the NO EC50 of sGC was approx. 2.9 nM, whereas that required to achieve IC50 of respiration was 141 nM (the basal oxygen consumption in the absence of NO was 14±0.8 pmol of O2/s per 106 cells). In accordance with this, the NO–cGMP signalling transduction pathway was activated at lower NO concentrations than the AMPKs (AMP-activated protein kinase) pathway. We conclude that sGC is approx. 50-fold more sensitive than cellular respiration to endogenous NO under our experimental conditions. The implications of these results for cell physiology are discussed.

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Authors
Rodríguez-Juárez, F., Aguirre, E., & Cadenas, S.
Affiliations
Spanish National Centre for Cardiovascular Research (ES)
Venue
Biochemical Journal
Published
2007-06-27
Volume
405
Issue
2
Pages
223-231
ISSN
  • 0264-6021 (ISSN-L)
  • 1470-8728
OpenAlex
W2033968800
Cited by
31
References
60
Citations by year
2021: 2 · 2020: 1 · 2019: 3 · 2018: 1 · 2017: 3 · 2016: 2 · 2015: 2 · 2013: 1 · 2012: 2
FWCI
2.23
Type
journal article
Language
en
Open access
Locations
  • Biochemical Journal (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion, other-oa)
  • Trinity's Access to Research Output (TARA) (Trinity College Dublin) (submittedVersion, other-oa)
Funders
Centro Nacional de Investigaciones Cardiovasculares
Topics
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Hemoglobin structure and function
Keywords
nitric oxide, soluble guanylate cyclase, cytochrome c oxidase, mitochondrial respiration, cGMP signaling, AMPK, oxygen consumption
MeSH terms
Vasodilator-Stimulated Phosphoprotein, Cells, Cultured, Electron Transport Complex IV, Guanylate Cyclase, Humans, Hydrazines, Microfilament Proteins, Mitochondria, Multienzyme Complexes, Nitric Oxide, Oxygen, Oxygen Consumption, Phosphoproteins, Phosphorylation, Signal Transduction, Cell Adhesion Molecules, Protein Serine-Threonine Kinases, Nitric Oxide Synthase Type II, AMP-Activated Protein Kinases

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