Cited by 63Hemoglobin structure and functionNitric Oxide and Endothelin EffectsErythrocyte Function and Pathophysiology

Comparative analysis of nitrite uptake and hemoglobin–nitrite reactions in erythrocytes: sorting out uptake mechanisms and oxygenation dependencies

Jensen, Frank B., Rohde, Sabina·2010·American Journal of Physiology-Regulatory, Integrative and Comparative Physiology

Abstract

Nitrite uptake into red blood cells (RBCs) precedes its intracellular reactions with hemoglobin (Hb) that forms nitric oxide (NO) during hypoxia. We investigated the uptake of nitrite and its reactions with Hb at different oxygen saturations (So(2)), using RBCs with (carp and rabbit) and without (hagfish and lamprey) anion exchanger-1 (AE1) in the membrane, with the aim to unravel the mechanisms and oxygenation dependencies of nitrite transport. Added nitrite rapidly diffused into the RBCs until equilibrium. The distribution ratio of nitrite across the membrane agreed with that expected from HNO(2) diffusion and AE1-mediated facilitated NO(2)(-) diffusion. Participation of HNO(2) diffusion was emphasized by rapid transmembrane nitrite equilibration also in the natural AE1 knockouts. Following the equilibration, nitrite was consumed by reacting with Hb, which created a continued inward diffusion controlled by intracellular reaction rates. Changes in nitrite uptake with So(2), pH, or species were accordingly explained by corresponding changes in reaction rates. In carp, nitrite uptake rates increased linearly with decreasing So(2) over the entire So(2) range. In rabbit, nitrite uptake rates were highest at intermediate So(2), producing a bell-shaped relationship with So(2). Nitrite consumption increased approximately 10-fold with a 1 unit decrease in pH, as expected from the involvement of protons in the reactions with Hb. The reaction of nitrite with deoxyhemoglobin was favored over that with oxyhemoglobin at intermediate So(2). We propose a model for RBC nitrite uptake that involves both HNO(2) diffusion and AE1-mediated transport and that explains both the present and previous (sometimes puzzling) results.

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Crossref · 10.1152/ajpregu.00813.2009

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Authors
Jensen, F. B., & Rohde, S.
Affiliations
University of Southern Denmark (DK)
Corresponding author
Jensen, Frank B.
Venue
American Journal of Physiology-Regulatory, Integrative and Comparative Physiology
Published
2010-04
Volume
298
Issue
4
Pages
R972-R982
ISSN
  • 0363-6119 (ISSN-L)
  • 1522-1490
OpenAlex
W1995820213
Cited by
63
References
47
Citations by year
2026: 1 · 2025: 5 · 2023: 2 · 2022: 4 · 2021: 3 · 2020: 4 · 2019: 3 · 2018: 4 · 2017: 6 · 2016: 2 · 2015: 2 · 2014: 5 · 2013: 4 · 2012: 7
FWCI
3.08
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Physiology-Regulatory, Integrative and Comparative Physiology (publishedVersion)
  • PubMed (publishedVersion)
  • University of Southern Denmark Research Portal (University of Southern Denmark) (submittedVersion)
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 uptake, erythrocytes, nitric oxide, band 3, oxygen saturation, hypoxia, pH dependence, deoxyhemoglobin, oxyhemoglobin, carp, rabbits, hagfish, lamprey, nitrite transport
MeSH terms
Animals, Carps, Denmark, Erythrocytes, Hagfishes, Hemoglobins, Kinetics, Lampreys, Nitrites, Oxygen, Oxygen Consumption, Oxyhemoglobins, Rabbits, Species Specificity

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