Mercury Toxicity on Sodium Pump and Organoseleniums Intervention : A Paradox

• Published in: BioMed research international Vol. 2012; no. 2012; pp. 1 - 12
• Main Author: Kade, Ige Joseph
• Format: Journal Article
• Language: English
• Published: Cairo, Egypt Hindawi Puplishing Corporation 01.01.2012; Hindawi Publishing Corporation; Hindawi Limited
• Subjects: Animals; Binding Sites; Biomedical research; Cell Membrane - drug effects; Cell Membrane - metabolism; Enzymes; Humans; Mercury - toxicity; Models, Biological; Organoselenium Compounds - pharmacology; Phosphorylation; Review; Rodents; Sodium; Sodium-Potassium-Exchanging ATPase - metabolism; Toxicity
• ISSN: 1110-7243; 2314-6133; 1110-7251; 2314-6141
• DOI: 10.1155/2012/924549

Mercury is an environmental poison, and the damage to living system is generally severe. The severity of mercury poisoning is consequent from the fact that it targets the thiol-containing enzymes, irreversibly oxidizing their critical thiol groups, consequently leading to an inactivation of the enzyme. The Na+/K+-ATPase is a sulfhydryl protein that is sensitive to Hg2+ assault. On the other hand, organoseleniums are a class of pharmacologically promising compounds with potent antioxidant effects. While Hg2+ oxidizes sulfhydryl groups of Na+/K+-ATPase under in vitro and in vivo conditions, the organoselenium compounds inhibit Na+/K+-ATPase in vitro but enhance its activities under in vivo conditions with concomitant increase in the level of endogenous thiols. Paradoxically, it appears that these two thiol oxidants can be used to counteract one another under in vivo conditions, and this hypothesis serves as the basis for this paper.