Impaired Antioxidant Ability of HDL and More Oxidized LDL are associated with Male Patients with Atrial Fibrillation

ABSTRACT

OBJECTIVE: Atrial fibrillation (AF) is a common arrhythmia which is generally more prevalent in the elderly population. However, the new onset of AF is frequently found in young populations. In order to identify putative prognostic biomarkers for detection of young-onset AF, we purified and characterized lipoproteins in terms of oxidative and inflammatory properties. METHODS: Male patients with AF (46±7 years of age, n=19) were recruited. Their serum and individual lipoproteins were analyzed and compared with healthy controls (48±9 years of age, n=17). RESULTS: The patients with AF revealed hypertriglyceridemia, hyperuricemia with mild obesity, elevated levels of CRP, and a normal level of cholesterol. All lipoproteins from patients with AF demonstrated higher levels of TG and advanced glycated end products, and decreased particle size than controls. AF-LDL showed an increased extent of oxidation with increased atherogenic macrophage phagocytosis. AF-HDL showed impaired antioxidant ability and a lower level of apoA-I expression. CONCLUSION: These data suggest that lipoprotein properties are severely modified in young AF patients, which were correlated with increased oxidation and inflammation.