HDL-apoA-I Exchange: Rapid Detection and Association with Atherosclerosis

Mark S. Borja, Lei Zhao, Bradley Hammerson, Chongren Tang, Richard Yang, Nancy Carson, Gayani Fernando, Xiaoqin Liu, Madhu S. Budamagunta, Jacques Genest, Gregory C. Shearer, Franck Duclos, Michael N. Oda

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48 Scopus citations


High density lipoprotein (HDL) cholesterol levels are associated with decreased risk of cardiovascular disease, but not all HDL are functionally equivalent. A primary determinant of HDL functional status is the conformational adaptability of its main protein component, apoA-I, an exchangeable apolipoprotein. Chemical modification of apoA-I, as may occur under conditions of inflammation or diabetes, can severely impair HDL function and is associated with the presence of cardiovascular disease. Chemical modification of apoA-I also impairs its ability to exchange on and off HDL, a critical process in reverse cholesterol transport. In this study, we developed a method using electron paramagnetic resonance spectroscopy (EPR) to quantify HDL-apoA-I exchange. Using this approach, we measured the degree of HDL-apoA-I exchange for HDL isolated from rabbits fed a high fat, high cholesterol diet, as well as human subjects with acute coronary syndrome and metabolic syndrome. We observed that HDL-apoA-I exchange was markedly reduced when atherosclerosis was present, or when the subject carries at least one risk factor of cardiovascular disease. These results show that HDL-apoA-I exchange is a clinically relevant measure of HDL function pertinent to cardiovascular disease.

Original languageEnglish (US)
Article numbere71541
JournalPloS one
Issue number8
StatePublished - Aug 28 2013

All Science Journal Classification (ASJC) codes

  • General


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