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To compare the change in lipoprotein metabolism with aging, we analyzed the lipid and protein compositions of individual lipoprotein fractions. Healthy and nonobese elderly participants (elderly group, n = 26) had a serum lipid profile within the normal range, although slightly higher than in young participants (control group, n = 18). However, the elderly group had a twofold higher serum uric acid level and triglyceride (TG):high-density lipoprotein cholesterol ratio. The elderly group had less antioxidant ability and elevated TG content in high-density lipoprotein (HDL) with enhanced cholesteryl ester transfer activity. An elevated level of advanced glycated end products in lipoproteins and fragmentation of apoA-I were present in the elderly group, with detected lower apoA-I level and more multimerized apoA-I in HDL. The protein levels of apoA-I, apoC-III, and serum amyloid A in lipoprotein-deficient serum were increased in the elderly group.

the journals of gerontology. series a, biological sciences and medical sciences

Senescence-Related Truncation and Multimerization of Apolipoprotein A-I in High-Density Lipoprotein With an Elevated Level of Advanced Glycated End Products and Cholesteryl Ester Transfer Activity