Cited by 62Nitric Oxide and Endothelin EffectsRedox biology and oxidative stressAntioxidant Activity and Oxidative Stress

Nitrite in organ protection

Open access
Rassaf, Tienush, Ferdinandy, Peter, Schulz, Rainer·2014·British Journal of Pharmacology

Abstract

In the last decade, the nitrate‐nitrite‐nitric oxide pathway has emerged to therapeutical importance. Modulation of endogenous nitrate and nitrite levels with the subsequent S‐nitros(yl)ation of the downstream signalling cascade open the way for novel cytoprotective strategies. In the following, we summarize the actual literature and give a short overview on the potential of nitrite in organ protection.

AI snapshot

Written from the paper’s full text.

TL;DR

This review summarizes the nitrate–nitrite–nitric oxide pathway and argues that nitrite can be bioactivated to NO under hypoxia/ischaemia, providing cytoprotection in heart, vessel, brain, liver, lung, kidney, and shock/crush models. It highlights both promising preclinical and early clinical findings and unresolved questions about dosing, timing, tissue conversion, and potential peroxynitrite-mediated harm.

Key findings

  • Nitrite has three main sources: endogenous NO oxidation, oral bacterial reduction of dietary nitrate, and dietary nitrite. Healthy fasted human plasma nitrite is 0.1–0.5 µM; Tibetan highlanders had ~10 µM, 50-fold higher than sea-level humans, and rodents can reach ~10 µM.
  • Nitrite is reduced to bioactive NO under hypoxic/acidic conditions by haemoglobin, myoglobin, neuroglobin, cytoglobin, xanthine oxidoreductase, eNOS, mitochondrial enzymes, and other pathways; myoglobin-dependent bioactivation is important in cardiac ischaemia/reperfusion.
  • In mice, sodium nitrite reduced myocardial infarct size by 67%; dietary nitrite supplementation for 7 days reduced infarct size by 48%; nitrate supplementation also reduced infarct size. Protection was abolished in myoglobin knockout mice, and in the authors’ experiments nitrite did not reduce infarct size in cyclophilin D knockout mice.
  • Organ protection is reported across models: brain I/R infarction volume was reduced when nitrite was given within 3 h after transient occlusion and 1.5 h in permanent occlusion in rats; subarachnoid haemorrhage-induced vasospasm in macaques was reversed by IV nitrite (27 vs. 46% in vehicle); liver, lung, kidney, crush syndrome, and shock models also show benefits, though some renal and stroke studies were negative or depended on NO synthase status.

Methods

  • Narrative review of the literature on nitrite biology and organ protection, not a systematic review or meta-analysis.
  • Synthesizes mammalian physiology, animal models of ischaemia/reperfusion and other injuries, and human studies/trials, including dietary nitrate/nitrite interventions and inhaled nitrite.
  • Main analysis is qualitative: describes sources, bioactivation pathways, mechanisms, organ-specific evidence, and clinical translation; includes some unpublished mouse experiments in Figure 2.

Limitations

  • Stated: the protective or detrimental effect of NO in ischaemia/reperfusion may depend on local NO and superoxide concentrations and whether pathological peroxynitrite forms; whether nitrite treatment may cause pathological NO accumulation in ischaemic myocardium is not known and “may be a limitation.”
  • Stated: the relevance and function of several nitrite reductases “have still to be elucidated”; the exact role of erythrocytes in vascular flow regulation is “still under debate”; whether nitrite treatment would reverse altered NO metabolism in hyperlipidaemia “has not been investigated so far.”
  • Evident: as a narrative review, it lacks systematic search/quality assessment; some cited experiments are unpublished; mixed and negative results across stroke, kidney, and timing/dose conditions are acknowledged but not resolved.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1111/bph.12291

Cites

136 of 136 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

0 of 89 cited sources checked · 0 supported · 0 flagged

  • Premisecitation

    Nitrite alone was demonstrated to protect phages against X-ray radiation injury, presumably acting as a reducing agent.

    “As early as 1956, nitrite alone was demonstrated to protect phages against X-ray radiation injury, presumably acting as a reducing agent (Bachofer, 1956).”
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    • cites Bachofer, 1956

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  • Premisecitation

    Intravenous nitrate infusion, when given at the same dose as nitrite, conferred no reduction in infarct size following ischaemia/reperfusion in rat hearts.

    “These findings were confirmed in rat hearts in vitro and in vivo, which also demonstrated that intravenous nitrate infusion -when given at the same dose as nitriteconferred no reduction in infarct size following ischaemia/ reperfusion (Baker et al., 2007).”
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    • cites Baker et al., 2007

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  • Premisecitation

    Nitrite generated from nitrate by oral bacteria and then converted to NO in the stomach was suggested to play an important role in the protection of gastric mucosa from hazardous stress.

    “Nitrite, generated from nitrate by oral bacteria 'the so called enterosalivary cycle', and then converted to NO (Benjamin et al., 1994;Lundberg et al., 1994;2009;2006;2008;Kapil et al., 2010a) in the stomach was also suggested to play an important role in the protection of gastric mucosa from hazardous stress (Miyoshi et al., 2003).”
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    • cites Miyoshi et al., 2003

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  • Premisecitation

    Nitrate has blood pressure lowering effects in humans with hypertension when applied in lower doses.

    “In a recent study, it has been demonstrated that nitrate has also blood pressure lowering effects in humans with hypertension when applied in lower doses (Ghosh et al., 2013).”
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  • Premisecitation

    The cytoprotective effects of nitrate were completely abolished when mice received a mouthwash twice daily, eradicating the commensal bacterial flora necessary to reduce nitrate to nitrite.

    “The cytoprotective effects of nitrate were completely abolished, however, when mice received a mouthwash twice daily, using a commercially available antibacterial solution that eradicated the commensal bacterial flora which is necessary to reduce nitrate to nitrite (Hendgen-Cotta et al., 2012).”
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    • cites Hendgen-Cotta et al., 2012

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  • May combine two claims. 26
  • Classified as probably not a substantial claim. 1
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    Findingown data

    In our recent experiments, nitrite reduced infarct size following ischaemia/reperfusion in wild-type mice but not in Cyp D knockout mice.

    “In our recent experiments, nitrite reduced infarct size following ischaemia/reperfusion in wild-type mice but not in Cyp D knockout mice suggesting that the above mechanism might hold true also in hearts in vivo (Figure 2).”
    Quote in the paperSubstantial claim
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    Premisecitation

    The presence of nitrite, but not nitrate, reduced the extent of apoptosis in cultured endothelial cells during UVA-irradiation in a concentration-dependent manner by inhibiting lipid peroxidation; this protective effect was abolished by simultaneous administration of a NO scavenger.

    “Later on, the presence of nitrite, but not nitrate, reduced the extent of apoptosis in cultured endothelial cells during UVA-irradiation in a concentration-dependent manner by inhibiting lipid peroxidation; this protective effect was abolished by simultaneous administration of a NO scavenger (Suschek et al., 2003)”
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    Premisecitation

    The stomach content, plasma, heart and liver nitrite levels were significantly reduced after dietary nitrate and nitrite depletion, and could be restored to normal levels with nitrite supplementation.

    “Indeed, the stomach content, but also the plasma, heart (Samouilov et al., 2007) and liver nitrite levels were significantly reduced after dietary nitrate and nitrite depletion (Feelisch et al., 2002), and could be restored to normal levels with nitrite supplementation (Bryan et al., 2007).”
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    • cites Bryan et al., 2007

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    Premisecitation

    Nitrate supplementation reversed endothelial dysfunction in healthy subjects with endothelial dysfunction, an effect associated with an increase in circulating vascular progenitor cells, endogenous nitrite and S-nitrosothiol levels.

    “Applying the protocol of Larsen et al. (2006), the effects of dietary nitrate supplementation on healthy subjects with endothelial dysfunction was investigated; nitrate supplementation reversed endothelial dysfunction, an effect that was associated with an increase in circulating vascular progenitor cells (Heiss et al., 2012), endogenous nitrite and S-nitrosothiol levels.”
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    Premisecitation

    This prevents mitochondrial permeability transition pore opening and cytochrome c release.

    “This prevents mitochondrial permeability transition pore opening and cytochrome c release (Shiva et al., 2007).”
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    • cites Shiva et al., 2007

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    Premisecitation

    Mice fed a standard diet with supplementation of nitrite in their drinking water for 7 days exhibited significantly higher plasma and myocardial levels of nitrite, nitroso and nitrosyl-heme and displayed a 48% reduction in infarct size following ischaemia/reperfusion.

    “Also mice fed a standard diet with supplementation of nitrite in their drinking water for 7 days exhibited significantly higher plasma and myocardial levels of nitrite, nitroso and nitrosyl-heme and displayed a 48% reduction in infarct size following ischaemia/reperfusion.”
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    Premisecitation

    In humans, endothelial dysfunction is associated with reduced circulating nitroso compounds and the lack to increase plasma nitrite levels during exercise.

    “In humans, endothelial dysfunction is also associated with reduced circulating nitroso compounds (Heiss et al., 2006) and the lack to increase plasma nitrite levels during exercise (Lauer et al., 2008;Rassaf et al., 2010)”
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    • cites Rassaf et al., 2010

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    Premisecitation

    In hyperlipidaemia, NO-mediated cardioprotective pathways are disrupted and heat-shock protein 70 response is diminished.

    “In hyperlipidaemia, when NO bioavailability of the heart is diminished possibly due to oxidative stress-induced formation of peroxynitrite (Onody et al., 2003;Csont et al., 2007), NO-mediated cardioprotective pathways are disrupted (Giricz et al., 2009;Kupai et al., 2009); (for reviews see Ferdinandy, 2003;Ferdinandy et al., 2007), and heat-shock protein 70 response is diminished (Csont et al., 2”
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    • cites Giricz et al., 2009

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    Premisecitation

    Cyclophilin D undergoes S-nitrosylation on cysteine 203, leading to reduced MPTP opening in mice wild-type fibroblast but not in Cyp D knockout fibroblast.

    “Cyclophilin D (Cyp D), which accelerates MPTP opening, undergoes S-nitrosylation on cysteine 203 of Cyp D, leading to reduced MPTP opening in mice wild-type fibroblast but not in Cyp D knockout fibroblast (Nguyen et al., 2011).”
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    Premisecitation

    This dampens electron transfer and reduces reactive oxygen species generation and ameliorates oxidative inactivation of complexes II-IV and aconitase.

    “This dampens electron transfer and reduces reactive oxygen species generation and ameliorates oxidative inactivation of complexes II-IV and aconitase.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Shiva et al., 2007

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    Premisecitation

    Nitrite supplementation in the drinking water for 1 week restored NO homeostasis in eNOS knockout mice and protected against ischaemia/reperfusion injury.

    “Nitrite supplementation in the drinking water for 1 week restored NO homeostasis also in eNOS knockout mice, normally having reduced NO and NO metabolites, and protected against ischaemia/reperfusion injury (Bryan et al., 2008).”
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    Premisecitation

    Supplemental nitrate in the drinking water for 7 days also increased blood and tissue NO products and significantly reduced infarct size.

    “Supplemental nitrate in the drinking water for 7 days also increased blood and tissue NO products and significantly reduced infarct size (Bryan et al., 2007).”
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    Premisecitation

    Nitrite-mediated protection of the liver was dependent on NO generation and independent of endothelial NO synthase and heme oxygenase-1 enzyme activities.

    “Nitrite-mediated protection of the liver was dependent on NO generation and independent of endothelial NO synthase and heme oxygenase-1 enzyme activities (Duranski et al., 2005).”
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    Premisecitation

    A high dose of nitrite decreased hematoma volume, but not brain oedema.

    “A high dose of nitrite, however, decreased hematoma volume, but not brain oedema (Jung et al., 2011).”
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    • cites Jung et al., 2011

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    Premisecitation

    Nitrite reduced the infarction volume and enhanced functional recovery when administered within 3 h after transient intraluminal occlusion and 1.5 h in the permanent occlusion model in rats.

    “Varying the time point of infusion further indicated that nitrite reduced the infarction volume and enhanced functional recovery when nitrite was administered within 3 h after transient intraluminal occlusion and 1.5 h in the permanent occlusion model in rats respectively (Jung et al., 2009).”
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    Premisecitation

    In a cerebral ischaemia/reperfusion injury model in rats, intravenous nitrite infusion at the time of reperfusion reduced infarction volume and enhanced local cerebral blood flow and functional recovery.

    “In a cerebral ischaemia/reperfusion injury model, using the intraluminal occlusion of the middle cerebral artery for 90 min in rats, intravenous nitrite infusion at the time of reperfusion reduced infarction volume (measured at 24 h) and enhanced local cerebral blood flow and functional recovery.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Jung et al., 2006

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    Premisecitation

    In hepatic ischaemia/reperfusion injury in mice, nitrite exerted profound dose-dependent protective effects on cellular necrosis and apoptosis, with highly significant protective effects observed at near-physiological nitrite concentrations.

    “In hepatic ischaemia/reperfusion injury in mice, nitrite exerted profound dose-dependent protective effects on cellular necrosis and apoptosis, with highly significant protective effects observed at near-physiological nitrite concentrations.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Duranski et al., 2005

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    Premisecitation

    Nitrite treatment led to S-nitros(yl)ation and the inactivation of caspase-3, suppressing the barrier dysfunction of endothelia caused by hypoxia.

    “Nitrite treatment led to S-nitros(yl)ation and the inactivation of caspase-3, suppressing the barrier dysfunction of endothelia caused by hypoxia.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Lai et al., 2011

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    Premisecitation

    In patients undergoing orthotopic liver transplantation, inhaled NO doubled plasma nitrite levels, which improved liver function and reduced liver injury.

    “In patients undergoing orthotopic liver transplantation, inhaled NO doubled plasma nitrite levels, which improved liver function and reduced liver injury (Lang et al., 2007).”
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    • cites Lang et al., 2007

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    Premisecitation

    In mice with cardiac-specific overexpression of the human endothelial NO synthase gene, nitrite, nitrate and nitrosothiols levels were increased in the heart, plasma and liver, and these mice displayed a significant reduction in hepatic ischemia/reperfusion injury compared with wild-type littermates.

    “Indeed, in mice with cardiac-specific overexpression of the human endothelial NO synthase gene nitrite, nitrate and nitrosothiols levels were increased in the heart, plasma and liver.These mice displayed a significant reduction in hepatic ischemia/reperfusion injury compared with wild-type littermates (Elrod et al., 2008).”
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    • cites Elrod et al., 2008

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    Premisecitation

    Liver enzyme release was significantly reduced with nitrite supplementation, the protective effect being more efficacious with longer cold preservation times.

    “Liver enzyme release was significantly reduced with nitrite supplementation, the protective effect being more efficacious with longer cold preservation times.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Li et al., 2012

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    Premisecitation

    In a mouse model of pulmonary arterial hypertension, inhaled nebulized nitrite has been demonstrated to be a potent pulmonary vasodilator that can effectively prevent or reverse pulmonary arterial hypertension.

    “In a mouse model of pulmonary arterial hypertension, inhaled nebulized nitrite has been demonstrated to be a potent pulmonary vasodilator that can effectively prevent or reverse pulmonary arterial hypertension (Zuckerbraun et al., 2011).”
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    Premisecitation

    Liver histological examination demonstrated better preserved morphology, and less apoptosis with nitrite treatment and liver graft acute function post-transplantation was improved.

    “Liver histological examination demonstrated better preserved morphology, and less apoptosis with nitrite treatment and liver graft acute function post-transplantation was improved (Li et al., 2012).”
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    Premisecitation

    Nitrite treatment 2 weeks into the hypoxic exposure, after the establishment of pulmonary hypertension, halted the progression of pulmonary hypertension and reversed increases in right ventricular pressure.

    “Additionally, nitrite treatment 2 weeks into the hypoxic exposure, after the establishment of pulmonary hypertension, halted the progression of pulmonary hypertension and reversed increases in right ventricular pressure (Zuckerbraun et al., 2010;2011).”
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    Premisecitation

    In those mice, renal dysfunction, damage and inflammation were all reduced following nitrite treatment 1 min prior to reperfusion.

    “these effects were all reduced following nitrite treatment 1 min prior to reperfusion.”
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    • cites Milsom et al., 2010

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  • Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based).

    Interpretationreasoning

    Nitrite treatment may be advantageous in well-known NO deficient states such as hyperlipidaemia.

    “Nitrite treatment may be advantageous in well-known NO deficient states such as, for example hyperlipidaemia.”
    Quote in the paperNot a substantial claim
    • Rests on an assumption: Hyperlipidaemia is a well-known NO deficient state.
  • May combine two claims.

    Interpretationreasoning

    Timing and dose of nitrite application as well as the potential to convert nitrite to NO in the tissue are important to obtain a reduction in injury.

    “Timing and dose of nitrite application as well as the potential to convert nitrite to NO in the tissue are important to obtain a reduction in injury.”
    Quote in the paperSubstantial claim
27 of 27
  • The paper relies on this without support.

    Limb muscle compression and subsequent reperfusion are the causative factors in developing a crush syndrome.

    “Limb muscle compression and subsequent reperfusion are the causative factors in developing a crush syndrome.”
  • The paper relies on this without support.

    Hyperlipidaemia is a well-known NO deficient state.

    “well-known NO deficient states such as, for example hyperlipidaemia”
2 of 2

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?

  • Nitrite is protective against ischemia/reperfusion and other forms of injury in multiple tissues and organs.

    “Numerous investigations have reported that nitrite is protective against I/R and other forms of injury in multiple tissues and organs (81, 125, 188), as reviewed extensively elsewhere (157).”

    From Inorganic nitrite supplementation for healthy arterial aging (2014) · cites this paper as [157]

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Authors
Rassaf, T., Ferdinandy, P., & Schulz, R.
Affiliations
  • Düsseldorf University Hospital (DE)
  • Department of Pharmacology and Pharmacotherapy Semmelweis University Budapest Hungary
  • Justus-Liebig-Universität Gießen (DE)
Corresponding author
Rassaf, Tienush
Venue
British Journal of Pharmacology
Publisher
Wiley
Published
2013-12-10
Volume
171
Issue
1
Pages
1-11
ISSN
  • 0007-1188 (ISSN-L)
  • 1476-5381
OpenAlex
W1582403786
Cited by
62
References
136
Citations by year
2026: 2 · 2025: 2 · 2023: 1 · 2022: 1 · 2021: 5 · 2020: 8 · 2019: 2 · 2018: 9 · 2017: 6 · 2016: 7 · 2015: 7 · 2014: 12
FWCI
0.96
Type
journal article
Language
en
Open access
Locations
  • British Journal of Pharmacology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Semmelweis University Repository (Semmelweis University) (submittedVersion)
Topics
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
  • Health Sciences › Medicine › Biochemistry › Antioxidant Activity and Oxidative Stress
Keywords
nitrite, nitrate-nitrite-nitric oxide pathway, S-nitrosylation, organ protection, cytoprotection, nitric oxide signaling, organ damage
MeSH terms
Animals, Humans, Nitrates, Nitric Oxide, Nitrites, Signal Transduction, Reperfusion Injury, Myocardial Reperfusion Injury, Cytoprotection, Protective Agents

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