Cited by 38Nitric Oxide and Endothelin EffectsHigh Altitude and HypoxiaRedox biology and oxidative stress

Dietary nitrite attenuates oxidative stress and activates antioxidant genes in rat heart during hypobaric hypoxia

Singh, Manjulata, Arya, Aditya, Kumar, Rajesh, Bhargava, Kalpana, Sethy, Niroj Kumar·2012·Nitric Oxide

Abstract

The nitrite anion represents the circulatory and tissue storage form of nitric oxide (NO) and a signaling molecule, capable of conferring cardioprotection and many other health benefits. However, molecular mechanisms for observed cardioprotective properties of nitrite remain largely unknown. We have evaluated the NO-like bioactivity and cardioprotective efficacies of sodium nitrite supplemented in drinking water in rats exposed to short-term chronic hypobaric hypoxia. We observed that, nitrite significantly attenuates hypoxia-induced oxidative stress, modulates HIF-1α stability and promotes NO-cGMP signaling in hypoxic heart. To elucidate potential downstream targets of nitrite during hypoxia, we performed a microarray analysis of nitrite supplemented hypoxic hearts and compared with both hypoxic and nitrite supplemented normoxic hearts respectively. The analysis revealed a significant increase in the expression of many antioxidant genes, transcription factors and cardioprotective signaling pathways which was subsequently confirmed by qRT-PCR and Western blotting. Conversely, hypoxia exposure increased oxidative stress, activated inflammatory cytokines, downregulated ion channels and altered expression of both pro- and anti-oxidant genes. Our results illustrate the physiological function of nitrite as an eNOS-independent source of NO in heart profoundly modulating the oxidative status and cardiac transcriptome during hypoxia.

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Crossref · 10.1016/j.niox.2011.12.002

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  • Nitrite supplementation preserves or increases antioxidant capacity in the heart in a rat model of high altitude-induced hypoxia.

    “and in a rat model of high altitude-induced hypoxia (172)”

    From Inorganic nitrite supplementation for healthy arterial aging (2014) · cites this paper as [172]

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Authors
Singh, M., Arya, A., Kumar, R., Bhargava, K., & Sethy, N. K.
Affiliations
Defence Research and Development Organisation (IN)
Corresponding author
  • Bhargava, Kalpana
  • Sethy, Niroj Kumar
Venue
Nitric Oxide
Publisher
Elsevier BV
Published
2012-01
Volume
26
Issue
1
Pages
61-73
ISSN
1089-8603 (ISSN-L)
OpenAlex
W2065234547
Cited by
38
References
59
Citations by year
2025: 2 · 2023: 3 · 2022: 3 · 2021: 1 · 2019: 4 · 2018: 2 · 2017: 3 · 2016: 2 · 2015: 3 · 2014: 8 · 2013: 4 · 2012: 3
FWCI
3.27
Type
journal article
Language
en
Open access
closed
Locations
  • Nitric Oxide (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › High Altitude and Hypoxia
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
Keywords
dietary nitrite, sodium nitrite, hypobaric hypoxia, oxidative stress, antioxidant genes, cardioprotection, HIF-1α stability, NO/cGMP signaling, cardiac transcriptome, inflammation, heart
MeSH terms
Animals, Hypoxia, Antioxidants, Gene Expression Regulation, Cyclic GMP, Heart, Male, Myocardium, Nitric Oxide, Nitrites, Signal Transduction, Rats, Sprague-Dawley, Oxidative Stress, Dietary Supplements, Rats, Hypoxia-Inducible Factor 1, alpha Subunit, Nitric Oxide Synthase Type III, Transcriptome

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