Cited by 285Hemoglobin structure and functionNitric Oxide and Endothelin EffectsHeme Oxygenase-1 and Carbon Monoxide

Nitrite Reductase Function of Deoxymyoglobin: Oxygen Sensor and Regulator of Cardiac Energetics and Function

Rassaf, Tienush, Flögel, Ulrich, Drexhage, Christine, Hendgen-Cotta, Ulrike, Kelm, Malte, Schrader, Jürgen·2007·Circulation Research

Abstract

Although the primary function of myoglobin (Mb) has been considered to be cellular oxygen storage and supply, recent studies have suggested to classify Mb as a multifunctional allosteric enzyme. In the heart, Mb acts as a potent scavenger of nitric oxide (NO) and contributes to the attenuation of oxidative damage. Here we report that a dynamic cycle exists in which a decrease in tissue oxygen tension drives the conversion of Mb from being an NO scavenger in normoxia to an NO producer in hypoxia. The NO generated by reaction of deoxygenated Mb with nitrite is functionally relevant and leads to a downregulation of cardiac energy status, which was not observed in mice lacking Mb. As a consequence, myocardial oxygen consumption is reduced and cardiac contractility is dampened in wild-type mice. We propose that this pathway represents a novel homeostatic mechanism by which a mismatch between oxygen supply and demand in muscle is translated into the fractional increase of deoxygenated Mb exhibiting enhanced nitrite reductase activity. Thus, Mb may act as an oxygen sensor which through NO can adjust muscle energetics to limited oxygen supply.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1161/circresaha.107.152488

Cites

32 of 32 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • The peptide prevents NOX1 assembly and does not inhibit NOX2, NOX4, or NOX5 as tested in in vitro assays.

    “The peptide prevents NOX1 assembly and does not inhibit NOX2, NOX4, or NOX5 as tested in in vitro assays (772, 792).”
  • Factors demonstrated to reduce nitrite in tissues include deoxyhemoglobin, deoxymyoglobin, xanthine oxidoreductase, heme-based enzymes in mitochondria, and acidosis during ischemia.

    “There are a number of factors that have been demonstrated to reduce nitrite in the tissues, including deoxyhemoglobin, deoxymyoglobin, xanthine oxidoreductase, heme-based enzymes in the mitochondria and acidosis during ischemia [99,100].”

    From NO-Rich Diet for Lifestyle-Related Diseases (2015) · cites this paper as [99]

  • Administration of nitrite under hypoxia regulates cardiac energetics and functions resembling acute hibernation.

    “We have recently shown that the administration of nitrite under hypoxia regulates cardiac energetics and functions resembling the characteristics described for acute hibernation.28”
  • Evidence that myoglobin/nitrite interactions can promote NO-signaling in the context of an ischemic insult to the heart has been established using multiple criteria including myoglobin knockout mice.

    “evidence that myoglobin/nitrite interactions can promote NO-signaling in the context of an ischemic insult to the heart has been established using multiple criteria including the use of myoglobin knockout mice [28, 33, 53, 60].”
  • Exogenous administration of nitrite correlates with increased levels of S-nitrosothiols in red blood cells and other tissues both in vivo and in vitro.

    “exogenous administration of nitrite correlates with increased levels of S-nitrosothiols in red blood cells and other tissues both in vivo and in vitro [25, 43, 46-53].”

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Research works printed but not linked: 1

  1. Richardson RS, Newcomer SC, Noyszewski EA. Sceletal muscle intra- cellular pO2 assessed by myoglobin desaturation: response to graded exercise. J Appl Physiol. 2001;91:2679 -2685.

Cited by

Sorted by citations

Authors
Rassaf, T., Flögel, U., Drexhage, C., Hendgen-Cotta, U., Kelm, M., & Schrader, J.
Affiliations
  • Universitätsklinikum Aachen (DE)
  • From the University Hospital Aachen, Department of Medicine, Division of Cardiology, Pulmonary and Vascular Diseases (T.R., C.D., U.H.-C., M.K.), Aachen; and the Department of Cardiovascular Physiology (U.F., J.S.), Heinrich-Heine-University Düsseldorf, Germany.
Venue
Circulation Research
Published
2007-06-22
Volume
100
Issue
12
Pages
1749-1754
ISSN
  • 0009-7330 (ISSN-L)
  • 1524-4571
OpenAlex
W2104194825
Cited by
284
References
32
Citations by year
2026: 2 · 2025: 2 · 2024: 4 · 2023: 3 · 2022: 5 · 2021: 15 · 2020: 9 · 2019: 10 · 2018: 7 · 2017: 17 · 2016: 11 · 2015: 19 · 2014: 21 · 2013: 29 · 2012: 28
FWCI
10.59
Type
journal article
Language
en
Open access
closed
Locations
  • Circulation Research (publishedVersion)
  • PubMed (publishedVersion)
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
myoglobin, nitrite reductase activity, nitric oxide, nitrite, hypoxia, oxygen sensing, myocardial energy metabolism, myocardial oxygen consumption, cardiac contractility, oxygen supply and demand, allosteric enzymes, oxidative damage
MeSH terms
Animals, Energy Metabolism, Heart, Homeostasis, Myocardium, Myoglobin, Nitric Oxide, Nitrite Reductases, Oxygen, Oxygen Consumption, Mice, Knockout, Mice

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review