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HDL is the major lipoprotein carrier of plasma F2-isoprostanes

By Julie M. Proudfoot, Anne E. Barden, Wai Mun Loke, Kevin D. Croft, Ian B. Puddey and Trevor A. Mori

Abstract

Enhanced oxidative stress is implicated in the development of atherosclerosis in humans and animal models. F2-isoprostanes are formed in vivo via free radical peroxidation of arachidonic acid, and their quantification has allowed assessment of oxidative stress in vivo. F2-isoprostanes associate with lipids, although their distribution in human plasma lipoproteins is unknown. Our aim was to determine the distribution and levels of F2-isoprostanes in lipoproteins isolated from human plasma by ultracentrifugation and fast protein liquid chromatography (FPLC). F2-isoprostanes were significantly higher in HDL compared with LDL or VLDL after isolation by ultracentrifugation or FPLC. Furthermore, HDL3 particles contained elevated levels of F2-isoprostanes compared with HDL2. Platelet activating factor acetylhydrolase (PAF-AH), which hydrolyses esterified F2-isoprostanes from phospholipids, was predominantly associated with LDL. Reduced F2-isoprostanes in LDL may be related to higher PAF-AH activity in LDL. Paraoxonase 1 (PON-1) activity was associated with HDL2 and may be a contributing factor to the lower F2-isoprostanes in HDL2 compared with HDL3. Further studies are required to establish the implications of these findings on HDL function

Topics: Research Article
Publisher: American Society for Biochemistry and Molecular Biology
OAI identifier: oai:pubmedcentral.nih.gov:2656665
Provided by: PubMed Central
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