alexa Is it just paraoxonase 1 or are other members of the paraoxonase gene family implicated in atherosclerosis?
Bioinformatics & Systems Biology

Bioinformatics & Systems Biology

Journal of Glycomics & Lipidomics

Author(s): Reddy ST, Devarajan A, Bourquard N, Shih D, Fogelman AM

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Abstract PURPOSE OF REVIEW: During the past decade, paraoxonase 1, a HDL-associated protein, has been demonstrated to be an important contributor to the antioxidant capacity of HDL. Studies using paraoxonase 1 null mice by gene targeting and transgenic mice corroborated the hypothesis that paraoxonase 1 protects against atherosclerosis. In contrast to paraoxonase 1, the other two members of the paraoxonase gene family, namely paraoxonase 2 and paraoxonase 3, are either undetectable (paraoxonase 2) or detected at very low levels (paraoxonase 3) on HDL, and are considered to participate in intracellular antioxidant mechanisms. In this review, we summarize studies reported in the past 2 years suggesting a protective role for paraoxonase 2 and paraoxonase 3 in the development of atherosclerosis in mice. RECENT FINDINGS: Adenovirus-mediated expression of human paraoxonase 2 or paraoxonase 3 proteins protects against the development of atherosclerosis in apolipoprotein E-deficient mice. Paraoxonase 2-deficient mice develop significantly larger atherosclerotic lesions than their wild-type and heterozygous counterparts on an atherogenic diet despite having lower levels of apolipoprotein B-containing lipoproteins. Atherosclerotic lesions were significantly lower in male hPON3Tg/LDLR null mice than in LDLR null mice on a western diet. SUMMARY: We conclude that, in addition to paraoxonase 1, both paraoxonase 2 and paraoxonase 3 proteins are protective against the development of atherosclerosis in mice. These findings underscore the utility of all members of the paraoxonase gene family as therapeutic targets for the treatment of atherosclerosis. This article was published in Curr Opin Lipidol and referenced in Journal of Glycomics & Lipidomics

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