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(Circulation. 2008;118:1259-1267.)
© 2008 American Heart Association, Inc.

Molecular Cardiology

Combined Statin and Niacin Therapy Remodels the High-Density Lipoprotein Proteome

Pattie S. Green, PhD; Tomas Vaisar, PhD; Subramaniam Pennathur, MD; J. Jacob Kulstad, PhD; Andrew B. Moore, BS; Santica Marcovina, PhD; John Brunzell, MD; Robert H. Knopp, MD; Xue-Qiao Zhao, MD; Jay W. Heinecke, MD

From the Department of Medicine, University of Washington, Seattle. Dr Pennathur is currently at the Department of Medicine, University of Michigan, Ann Arbor.

Correspondence to Pattie S. Green, Division of Gerontology and Geriatric Medicine, VAPSHS S-151, 1660 S Columbian Way, Seattle, WA 98108. E-mail psgreen{at}u.washington.edu

Received February 4, 2008; accepted July 11, 2008.

Background— Boosting low high-density lipoprotein (HDL) levels is a current strategy for preventing clinical events that result from cardiovascular disease. We previously showed that HDL₃ of subjects with coronary artery disease is enriched in apolipoprotein E and that the lipoprotein carries a distinct protein cargo. This observation suggests that altered protein composition might affect the antiatherogenic and antiinflammatory properties of HDL. We hypothesized that an intervention that increases HDL levels—combined statin and niacin therapy—might reverse these changes.

Methods and Results— HDL₃ isolated from 6 coronary artery disease subjects before and 1 year after combination therapy was analyzed by liquid chromatography–Fourier transform–mass spectrometry. Alterations in protein composition were detected by spectral counting and confirmed with extracted ion chromatograms. We found that combination therapy decreased the abundance of apolipoprotein E in HDL₃ while increasing the abundance of other macrophage proteins implicated in reverse cholesterol transport. Treatment-induced decreases in apolipoprotein E levels of HDL₃ were validated biochemically in a second group of 18 coronary artery disease subjects. Interestingly, the changes in HDL₃ proteome with niacin/statin treatment resulted in a protein composition that more closely resembled that of HDL₃ in healthy control subjects.

Conclusions— Combined statin and niacin therapy partially reverses the changes in the protein composition seen in HDL₃ in coronary artery disease subjects. Our observations raise the possibility that quantifying the HDL proteome could provide insights into the therapeutic efficacy of antiatherosclerotic interventions.

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CLINICAL PERSPECTIVE

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