alexa Mechanism of the tumor suppressive effect of MnSOD overexpression.
Toxicology

Toxicology

Journal of Drug Metabolism & Toxicology

Author(s): Oberley LW

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Abstract The mitochondrial antioxidant protein manganese-containing superoxide dismutase (MnSOD) has been shown to be a new type of tumor suppressor protein. Overexpression of MnSOD protein inhibits growth in a wide variety of cancer types. This review examines the molecular mechanism of the tumor suppressive effect of MnSOD. Three species have been proposed to cause the tumor suppressive effect: superoxide radical, hydrogen peroxide and nitric oxide. At the present time, the evidence appears strongest that hydrogen peroxide is the effector molecule since both catalase and glutathione peroxidase has been shown to modulate the effect. Surprisingly, in different cancer cell lines, overexpression of GPx has been found to both decrease and increase the growth inhibitory effect of MnSOD overexpression. Knowledge of which molecule causes the tumor suppressive effect of MnSOD and the mechanism of action will likely lead to new therapies for the treatment of cancer. This article was published in Biomed Pharmacother and referenced in Journal of Drug Metabolism & Toxicology

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