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Dietary vitamin E and selenium and toxicity of nitrite and nitrate.

Abstract

Nitrites and nitrates are important antimicrobial and flavoring/coloring agents in meat and fish products. However, nitrites and nitrates may cause methemoglobinemia and other illness, and may react with certain amines to form carcinogenic nitrosamines. The nutritional status of vitamin E and selenium has long been associated with nitrite and nitrate toxicity, although the mechanism involved is not yet clear. Information available recently shows that nitrites and nitrates are both oxidation products and ready sources of nitric oxide (NO*), that NO* reacts rapidly with superoxide to form highly reactive peroxynitrite (ONOO-), and that vitamin E may mediate the generation and availability of superoxide and NO*. Increased formation of ONOO- resulting from nitrite treatment and low intake of vitamin E and selenium may thus be the critical event leading to tissue damage and animal mortality observed previously. The protection against the adverse effects of nitrites/nitrates by vitamin E is attributed to its ability to reduce ONOO- formation, while selenium exerts its protective effects via seleno-enzymes/compounds, which reduce ONOO- formed.

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  • Publisher Full Text
  • Authors+Show Affiliations

    ,

    Graduate Center for Nutritional Sciences, University of Kentucky, Lexington, KY 40506-0054, USA. ckchow@uky.edu

    Source

    Toxicology 180:2 2002 Nov 15 pg 195-207

    MeSH

    Animals
    Antioxidants
    Diet
    Humans
    Inactivation, Metabolic
    Nitrates
    Nitrites
    Oxidation-Reduction
    Peroxynitrous Acid
    Reactive Nitrogen Species
    Reactive Oxygen Species
    Selenium
    Superoxides
    Vitamin E

    Pub Type(s)

    Journal Article
    Review

    Language

    eng

    PubMed ID

    12324194

    Citation

    Chow, C K., and C B. Hong. "Dietary Vitamin E and Selenium and Toxicity of Nitrite and Nitrate." Toxicology, vol. 180, no. 2, 2002, pp. 195-207.
    Chow CK, Hong CB. Dietary vitamin E and selenium and toxicity of nitrite and nitrate. Toxicology. 2002;180(2):195-207.
    Chow, C. K., & Hong, C. B. (2002). Dietary vitamin E and selenium and toxicity of nitrite and nitrate. Toxicology, 180(2), pp. 195-207.
    Chow CK, Hong CB. Dietary Vitamin E and Selenium and Toxicity of Nitrite and Nitrate. Toxicology. 2002 Nov 15;180(2):195-207. PubMed PMID: 12324194.
    * Article titles in AMA citation format should be in sentence-case
    TY - JOUR T1 - Dietary vitamin E and selenium and toxicity of nitrite and nitrate. AU - Chow,C K, AU - Hong,C B, PY - 2002/9/27/pubmed PY - 2002/11/26/medline PY - 2002/9/27/entrez SP - 195 EP - 207 JF - Toxicology JO - Toxicology VL - 180 IS - 2 N2 - Nitrites and nitrates are important antimicrobial and flavoring/coloring agents in meat and fish products. However, nitrites and nitrates may cause methemoglobinemia and other illness, and may react with certain amines to form carcinogenic nitrosamines. The nutritional status of vitamin E and selenium has long been associated with nitrite and nitrate toxicity, although the mechanism involved is not yet clear. Information available recently shows that nitrites and nitrates are both oxidation products and ready sources of nitric oxide (NO*), that NO* reacts rapidly with superoxide to form highly reactive peroxynitrite (ONOO-), and that vitamin E may mediate the generation and availability of superoxide and NO*. Increased formation of ONOO- resulting from nitrite treatment and low intake of vitamin E and selenium may thus be the critical event leading to tissue damage and animal mortality observed previously. The protection against the adverse effects of nitrites/nitrates by vitamin E is attributed to its ability to reduce ONOO- formation, while selenium exerts its protective effects via seleno-enzymes/compounds, which reduce ONOO- formed. SN - 0300-483X UR - https://www.unboundmedicine.com/medline/citation/12324194/full_citation L2 - https://linkinghub.elsevier.com/retrieve/pii/S0300483X02003918 DB - PRIME DP - Unbound Medicine ER -