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Atherosclerosis and Lipoproteins |
From the Department of Anatomy and Cell Biology, State University of New York, Downstate Medical Center (X.P.Y., D.Y., R.J.L., J.C., X.C.J.), Brooklyn, NY; Department of Molecular Genetics and Biochemistry, University of Pittsburgh (C.Q., J.L., X.X.), Pittsburgh, Pa; and INSERM U498, Faculté de Médecine (M.S., L.L.), Dijon, France.
Correspondence to Xian-Cheng Jiang, PhD, Department of Anatomy and Cell Biology, State University of New York, Downstate Medical Center, Brooklyn, NY 11203. E-mail xjiang{at}downstate.edu
Objective Plasma phospholipid transfer protein (PLTP) is involved in the metabolism of HDL and apolipoprotein B (apoB)-containing lipoproteins. Atherosclerosis susceptibility is decreased in mice with PLTP deficiency that is associated with decreased liver production of apoB-containing lipoproteins and increase in their antioxidant. To investigate additionally the effect of PLTP on the development of atherosclerosis, we overexpressed PLTP in mice.
Methods and Results PLTP was overexpressed in apoE knockout mice using an adenovirus-associated virus (AAV)-mediated system. Plasma PLTP activity was 1.3- to 2-fold higher in mice injected with AAV-PLTP than in mice injected with control AAV-GFP, and PLTP levels were sustained during the experiment period (4 months). We show that 2-fold increased PLTP activity results in (1) a decrease in HDL cholesterol, HDL phospholipid, and apoAI levels; (2) a decrease in vitamin E contents in total plasma and in individual lipoprotein fractions; (3) an increase in lipoprotein oxidizability as assessed by copper-induced formation of conjugated dienes; (4) an increase in autoantibodies against oxidized apoB-containing particles; and (5) an increase in atherosclerosis lesions in proximal aorta.
Conclusions These observations indicate that elevated plasma PLTP levels constitute a novel, long-term risk factor for atherosclerosis.
Key Words: phospholipid transfer protein apoB-containing lipoproteins oxidation high-density lipoprotein atherosclerosis
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