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Title: Dietary cholesterol withdrawal reduces vascular inflammation and induces coronary plaque stabilization in miniature pigs
Authors: Verhamme, Peter ×
Quarck, Rozenn
Hao, Hiroyuki
Knaapen, Michiel
Dymarkowski, Steven
Bernar, Hilde
Van Cleemput, Johan
Janssens, Stefan
Vermylen, Jozef
Gabbiani, Giulio
Kockx, Mark
Holvoet, Paul #
Issue Date: Sep-2002
Series Title: Cardiovascular Research vol:56 issue:1 pages:135-44
Abstract: OBJECTIVE: To study the effect of dietary cholesterol withdrawal on size and composition of LDL-hypercholesterolemia-induced coronary plaques in miniature pigs. METHODS: Pigs were on normal chow (control group), on a cholesterol-rich diet for 37 weeks (hypercholesterolemic group) or on a cholesterol-rich diet followed by normal chow for 26 weeks (cholesterol withdrawal group). Endothelial function was assessed with quantitative angiography after intracoronary infusion of acetylcholine, plaque load with intra-coronary ultrasound and plaque composition with image analysis of cross-sections. The effect of porcine serum on coronary smooth muscle cell (SMC) function was studied in vitro. RESULTS: Cholesterol-rich diet caused LDL-hypercholesterolemia, increased plasma levels of oxidized LDL (ox-LDL) and C-reactive protein (CRP), and induced endothelial dysfunction and coronary atherosclerosis. Dietary cholesterol withdrawal lowered LDL, ox-LDL and CRP. It restored endothelial function, did not affect plaque size but decreased lipid, ox-LDL and macrophage content. Smooth muscle cells and collagen accumulated within the plaque. Increased smoothelin-to-alpha-smooth muscle actin ratio indicated a more differentiated SMC phenotype. Cholesterol lowering reduced proliferation and apoptosis. In vitro, hypercholesterolemic serum increased SMC apoptosis and decreased SMC migration compared to non-hypercholesterolemic serum. CONCLUSIONS: Cholesterol lowering induced coronary plaque stabilization as evidenced by a decrease in lipids, ox-LDL, macrophages, apoptosis and cell proliferation, and an increase in differentiated SMC and collagen. Increased migration and decreased apoptosis of SMC may contribute to the disappearance of the a-cellular core after lipid lowering.
URI: 
ISSN: 0008-6363
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular and Vascular Biology
Cardiology
Atherosclerosis and Metabolism (-)
Pneumology
Faculty of Medicine - miscellaneous
× corresponding author
# (joint) last author

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