Paraoxonase enzyme and polymorphisms

Paraoxonase (PON1) is an enzyme carried on high-density lipoprotein particles in the bloodstream, where it helps neutralize oxidized lipids that would otherwise drive the buildup of arterial plaques. Because PON1 activity varies considerably between individuals depending on which variants they carry at several genetic loci, researchers have spent decades trying to untangle how much of the population-level risk for cardiovascular disease can be traced to these polymorphisms and whether low enzyme activity is a cause or a consequence of atherosclerotic processes. A central open question is whether the antioxidant and anti-inflammatory effects of PON1 are potent enough in vivo to make the enzyme a meaningful therapeutic or dietary target, or whether its clinical relevance is largely as a biomarker. Active work is also clarifying how lifestyle factors—diet, smoking, metabolic syndrome—interact with genetic background to modulate PON1 activity, with the goal of identifying who might benefit most from interventions designed to raise HDL-associated antioxidant capacity.

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Keywords

ParaoxonaseAtherosclerosisOxidative StressAntioxidantCardiovascular DiseaseGenetic Polymorphisms