Cited by 46Nitric Oxide and Endothelin EffectsLipid Membrane Structure and BehaviorElectron Spin Resonance Studies

Magnetic resonance study of the transmembrane nitrite diffusion

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Samouilov, A., Woldman, Ya.Yu., Zweier, J.L., Khramtsov, V.V.·2007·Nitric Oxide

Abstract

Nitrite (NO(2)-), being a product of metabolism of both nitric oxide (NO(*)) and nitrate (NO(3)-), can accumulate in tissues and regenerate NO() by several mechanisms. The effect of NO(2)- on ischemia/reperfusion injury was also reported. Nevertheless, the mechanisms of intracellular NO(2)- accumulation are poorly understood. We suggested significant role of nitrite penetration through biological membranes in the form of undissociated nitrous acid (HNO(2)). This hypothesis has been tested using large unilamellar phosphatidylcholine liposomes and several spectroscopic techniques. HNO(2) transport across the phospholipid bilayer of liposomes facilitates proton transfer resulting in intraliposomal acidification, which was measured using pH-sensitive probes. NO(2)(-)-mediated intraliposomal acidification was confirmed by EPR spectroscopy using membrane-impermeable pH-sensitive nitroxide, AMC (2,2,5,5-tetramethyl-1-yloxy-2,5-dihydro-1H-imidazol-3-ium-4-yl)-aminomethanesulfonic acid (pK 5.25), and by (31)P NMR spectroscopy using inorganic phosphate (pK 6.9). Nitrite accumulates inside liposomes in concentration exceeding its concentration in the bulk solution, when initial transmembrane pH gradient (alkaline inside) is applied. Intraliposomal accumulation of NO(2)- was observed by direct measurement using chemiluminescence technique. Perfusion of isolated rat hearts with buffer containing 4 microM NO(2)- was performed. The nitrite concentrations in the effluent and in the tissue, measured after 1 min perfusion, were close, supporting fast penetration of the nitrite through the tissue. Measurements of the nitrite/nitrate showed that total concentration of NO(x) in myocardium increased from initial 7.8 to 24.7 microM after nitrite perfusion. Physiological significance of passive transmembrane transport of NO(2)- and its coupling with intraliposomal acidification are discussed.

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Crossref · 10.1016/j.niox.2006.12.006

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Authors
Samouilov, A., Woldman, Y. Y., Zweier, J. L., & Khramtsov, V. V.
Affiliations
  • The Ohio State University Wexner Medical Center (US)
  • Valdosta State University (US)
  • The Ohio State University (US)
Corresponding author
Samouilov, A.
Venue
Nitric Oxide
Publisher
Elsevier BV
Published
2007-05
Volume
16
Issue
3
Pages
362-370
ISSN
1089-8603 (ISSN-L)
OpenAlex
W2062788178
Cited by
46
References
56
Citations by year
2026: 1 · 2025: 2 · 2024: 1 · 2023: 3 · 2022: 3 · 2021: 2 · 2020: 1 · 2019: 1 · 2018: 2 · 2017: 2 · 2016: 1 · 2015: 2 · 2014: 6 · 2013: 2 · 2012: 7
FWCI
1.79
Type
journal article
Language
en
Open access
Locations
  • Nitric Oxide (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • National Heart, Lung, and Blood Institute (R01HL063744, HL 65608, P01HL065608, HL 63744, HL38324-05, R01HL038324)
  • National Institute of Biomedical Imaging and Bioengineering (K01EB003519, K01 EB03519)
Topics
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Lipid Membrane Structure and Behavior
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biophysics › Electron Spin Resonance Studies
Keywords
nitrite, membrane diffusion, proton transfer, phosphatidylcholine liposomes, nitrate, myocardium, ischemia-reperfusion injury, passive transport
MeSH terms
Animals, Cell Membrane, Diffusion, Electron Spin Resonance Spectroscopy, Female, Hydrogen-Ion Concentration, Liposomes, Myocardium, Nitrites, Phospholipids, Molecular Structure, Rats, Sprague-Dawley, Nuclear Magnetic Resonance, Biomolecular, Rats

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