Cited by 56Hemoglobin structure and functionNitric Oxide and Endothelin EffectsHeme Oxygenase-1 and Carbon Monoxide

Quantification of intermediates formed during the reduction of nitrite by deoxyhemoglobin

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Salgado, Maria T., Nagababu, Enika, Rifkind, Joseph M.·2009·Journal of Biological Chemistry

Abstract

Nitric oxide (NO) plays a crucial role in human physiology by regulating vascular tone and blood flow. The short life-span of NO in blood requires a mechanism to retain NO bioactivity in the circulation. Recent studies have suggested a mechanism involving the reduction of nitrite back to NO by deoxyhemoglobin in RBCs. A role for RBCs in transporting NO must, however, bypass the scavenging of NO in RBCs by hemoglobin. To understand how the nitrite reaction can deliver bioactive NO to the vasculature, we have studied the intermediates formed during the reaction. A reliable measure of the total concentration of heme-associated nitrite/NO intermediates formed was provided by combining filtration to measure free nitrite by chemiluminescence and electron paramagnetic resonance to measure the final product Hb(II)NO. By modifying the chemiluminescence method used to detect NO, we have been able to identify two intermediates: 1) a heme-associated nitrite complex that is released as NO in acid solution in the presence of ascorbate and 2) an intermediate that releases NO at neutral pH in the presence of ferricyanide when reacted with an Fe(III) ligand like azide. This species designated as "Hb(II)NO(+) (<--)(-->)Hb(III)NO" has properties of both isomeric forms resulting in a slower NO dissociation rate and much higher stability than Hb(III)NO, but provides a potential source for bioactive NO, which can be released from the RBC. This detailed analysis of the nitrite reaction with deoxyHb provides important insights into the mechanism for nitrite induced vasodilation by RBCs.

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  • Several proposed mechanisms explain how nitrite-derived bioactivity can be exported from the red blood cell, generally involving either a compartment model with submembrane localization or formation of another nitrogen oxide such as a nitrosothiol or N2O3.

    “Several proposed mechanisms have been constructed to explain how nitrite-derived bioactivity can be exported from the red blood cell and these generally involve either a compartment model with submembrane localization of the reaction allowing for inefficient free NO escape, or the formation of another nitrogen oxide such as a nitrosothiol or N2O3 that can get out of the red blood cell and carry NO”

    From Mechanisms of nitrite bioactivation (2014) · cites this paper as [49]

  • In one proposed mechanism for nitrite anhydrase, an intermediate ferric nitrosyl species is formed and this then reacts with a second nitrite molecule.

    “In one proposed mechanism for nitrite anhydrase, an intermediate ferric nitrosyl species is formed (which is equivalent to a ferrous nitrosonium) and this then reacts with a second nitrite molecule [49, 97, 98].”

    From Mechanisms of nitrite bioactivation (2014) · cites this paper as [49]

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Research works printed but not linked: 5

  1. Luchsinger, B. P., Rich, E. N., Gow, A. J., Williams, E. M., Stamler, J. S., and Singel, D. J. (2003) Proc. Natl. Acad. Sci. U. S. A. 100, 461-466
  2. Gladwin, M. T., Ognibene, F. P., Pannell, L. K., Nichols, J. S., Pease-Fye, M. E., Shelhamer, J. H., and Schechter, A. N. (2000) Proc. Natl. Acad. Sci.
  3. Addison, A. W., and Stephanos, J. J. (1986) Biochemistry 25, 4104 -4113
  4. Angelo, M., Singel, D. J., and Stamler, J. S. (2006) Proc. Natl. Acad. Sci.
  5. Nagababu, E., Cao, Z., Ramasamy, S., and Rifkind, J. M. (2008) XVth Inter- national Conference on Oxygen Binding and Sensing Proteins P27

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Authors
Salgado, M. T., Nagababu, E., & Rifkind, J. M.
Affiliations
National Institutes of Health (US)
Corresponding author
Rifkind, Joseph M.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2009-05
Volume
284
Issue
19
Pages
12710-12718
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2056208513
Cited by
56
References
29
Citations by year
2023: 1 · 2021: 1 · 2020: 1 · 2019: 1 · 2018: 3 · 2017: 2 · 2016: 1 · 2015: 4 · 2014: 6 · 2013: 4 · 2012: 17
FWCI
4.75
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institutes of Health
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Hemoglobin structure and function
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heme Oxygenase-1 and Carbon Monoxide
Keywords
nitrite reduction, deoxyhemoglobin, nitric oxide, erythrocytes, electron spin resonance, vitamin C, ferricyanide, azide
MeSH terms
Electron Spin Resonance Spectroscopy, Erythrocytes, Hemoglobins, Humans, Isomerism, Nitrates, Nitrites, Oxidation-Reduction, Luminescence

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