Cited by 62Hemoglobin structure and functionNitric Oxide and Endothelin EffectsErythrocyte Function and Pathophysiology

Regulation of nitrite transport in red blood cells by hemoglobin oxygen fractional saturation

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Vitturi, Dario A., Teng, Xinjun, Toledo, José C., Matalon, Sadis, Lancaster, Jack R., Patel, Rakesh P.·2009·American Journal of Physiology-Heart and Circulatory Physiology

Abstract

Allosteric regulation of nitrite reduction by deoxyhemoglobin has been proposed to mediate nitric oxide (NO) formation during hypoxia. Nitrite is predominantly an anion at physiological pH, raising questions about the mechanism by which it enters the red blood cell (RBC) and whether this is regulated and coupled to deoxyhemoglobin-mediated reduction. We tested the hypothesis that nitrite transport by RBCs is regulated by fractional saturation. Using human RBCs, nitrite consumption was faster at lower fractional saturations, consistent with faster reactions with deoxyheme. A membrane-based regulation was suggested by slower nitrite consumption with intact versus lysed RBCs. Interestingly, upon nitrite addition, intracellular nitrite concentrations attained a steady state that, despite increased rates of consumption, did not change with decreasing oxygen tensions, suggesting a deoxygenation-sensitive step that either increases nitrite import or decreases the rate of nitrite export. A role for anion exchanger (AE)-1 in the control of nitrite export was suggested by increased intracellular nitrite concentrations in RBCs treated with DIDS. Moreover, deoxygenation decreased steady-state levels of intracellular nitrite in AE-1-inhibited RBCs. Based on these data, we propose a model in which deoxyhemoglobin binding to AE-1 inhibits nitrite export under low oxygen tensions allowing for the coupling between deoxygenation and nitrite reduction to NO along the arterial-to-venous gradient.

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Crossref · 10.1152/ajpheart.01303.2008

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  • Nitrite entry into the red blood cell is likely mediated mostly by passive diffusion as nitrous acid, while AE-1 might control net fluxes of nitrite transport by mediating nitrite export via an oxygen-sensitive process coupled to hemoglobin oxygenation state.

    “we recently suggested that whereas nitrite entry into the red blood cell is likely to be mediated mostly by passive diffusion in the form of nitrous acid, AE-1 might be involved in controlling net fluxes of nitrite transport across the red blood cell membrane by mediating nitrite export via an oxygen-sensitive process coupled to the hemoglobin oxygenation state [99].”
  • Current perspectives postulate that nitrite diffuses across the plasma membrane by becoming protonated to nitrous acid and, in red cells from some species, by interacting with anion exchanger 1 (AE-1).

    “Current perspectives postulate that nitrite diffuses across the plasma membrane by becoming protonated to nitrous acid [97] and, in the context of red cells from some species, by interacting with the anion exchanger 1 (AE-1) [98, 99].”

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Authors
Vitturi, D. A., Teng, X., Toledo, J. C., Matalon, S., Lancaster, J. R., & Patel, R. P.
Venue
American Journal of Physiology-Heart and Circulatory Physiology
Published
2009-05
Volume
296
Issue
5
Pages
H1398-H1407
ISSN
  • 0363-6135 (ISSN-L)
  • 1522-1539
OpenAlex
W2144421437
Cited by
62
References
65
Citations by year
2024: 4 · 2023: 1 · 2022: 2 · 2021: 3 · 2020: 4 · 2019: 1 · 2018: 4 · 2017: 2 · 2016: 3 · 2015: 5 · 2014: 5 · 2013: 2 · 2012: 8
FWCI
3.86
Type
journal article
Language
en
Open access
Locations
  • American Journal of Physiology-Heart and Circulatory Physiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • American Heart Association
  • National Heart, Lung, and Blood Institute (HL 074391, R01HL071189, R01HL075540, HL 71189, R01HL074391)
  • National Institute of Environmental Health Sciences (U01ES015676, U54ES017218)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Hemoglobin structure and function
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Health Sciences › Medicine › Physiology › Erythrocyte Function and Pathophysiology
Keywords
nitrite transport, erythrocytes, nitrite reduction, nitric oxide production, hypoxia, band 3, deoxyhemoglobin
MeSH terms
Hypoxia, Anion Exchange Protein 1, Erythrocyte, Binding Sites, Biological Transport, Erythrocytes, Hemoglobins, Humans, Kinetics, Methemoglobin, Models, Cardiovascular, Nitric Oxide, Nitrites, Oxidation-Reduction, Oxygen, Oxyhemoglobins, Vasodilation, 4,4'-Diisothiocyanostilbene-2,2'-Disulfonic Acid

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