Hermetica Superfood Encyclopedia
Legacy index-continuity record: the score and narrative are provisional and must not be represented as validated or human-approved.
Review flags: AWAITING_SEMANTIC_VALIDATION
Glutathione peroxidase (GPx) is a selenium-dependent enzyme family that protects cells from oxidative damage. It reduces harmful hydrogen peroxide and lipid hydroperoxides to water or alcohols, utilizing glutathione as a co-substrate.
Reported Benefits (Provisional)
Origin & History
Glutathione peroxidase (GPx) is a selenium-dependent antioxidant enzyme that catalyzes the reduction of hydrogen peroxide and lipid peroxides to water and non-toxic alcohols, utilizing reduced glutathione (GSH) as an electron donor. Found in nearly all human tissues, with high concentrations in the liver, kidneys, and red blood cells, GPx plays a central role in cellular defense against oxidative damage and maintaining redox homeostasis.
Research Narrative (Provisional)
Glutathione peroxidase is widely studied in redox biology, toxicology, and immunology. Its activity is inversely correlated with markers of oxidative stress, aging, and inflammation. Deficiencies are associated with increased risk of cancer, cardiovascular disease, and neurodegeneration, while selenium supplementation has been shown to boost GPx activity in clinical trials.
Preparation & Dosage
Dosage guidance is withheld because the publication gate has not recorded adequate support for this profile.
Nutritional Profile
- Cofactor Requirement: Requires selenium as an essential cofactor for its catalytic activity. - Substrate Utilization: Uses reduced glutathione (GSH) to convert harmful peroxides into water or alcohol. - Protective Action: Reduces lipid peroxides to protect cellular membranes and organelles from damage. - Enzyme Class: Belongs to the family of antioxidant enzymes, working in concert with other cellular defenses.
Reported Mechanism (Provisional)
GPx, particularly selenized isozymes like GPx1 and GPx4, incorporates selenium as selenocysteine in its active site. The mechanism involves selenol oxidation by hydrogen peroxide or lipid hydroperoxides, forming selenenic acid. This intermediate then reacts with glutathione (GSH), which is subsequently regenerated by glutathione reductase, completing the catalytic cycle that detoxifies reactive oxygen species.
Clinical Narrative (Provisional)
Glutathione peroxidase is extensively studied in redox biology, toxicology, and immunology, with numerous observational and intervention studies exploring its roles. Research consistently demonstrates an inverse correlation between GPx activity and markers of oxidative stress, inflammation, and aging across various human and animal models. Deficiencies in GPx activity are frequently associated with an increased risk of chronic diseases, including cancer, cardiovascular disease, and neurodegenerative conditions, underscoring its critical role in maintaining cellular health. While specific sample sizes and study types are varied, the overarching conclusion points to GPx as a vital antioxidant defense mechanism.
Also Known As
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