© 1995 American Heart Association, Inc.
Articles |
Relation Between Cholesterol Ester Transfer Protein Activities and Lipoprotein Cholesterol in Patients With Hypercholesterolemia and Combined Hyperlipidemia
From the Center for Human Nutrition (F.T., G.L.V., S.M.G.) and Departments of Clinical Nutrition (G.L.V., S.M.G.), Internal Medicine (S.M.G.), and Biochemistry (S.M.G.), University of Texas Southwestern Medical Center, Dallas, and the Department of Internal Medicine (A.R.T.), College of Physicians and Surgeons, Columbia University Medical Center, New York, NY.
Correspondence to Gloria Lena Vega, PhD, Center for Human Nutrition, UT Southwestern Medical Center, 5323 Harry Hines Blvd, Room Y3.206, Dallas, TX 75235-9052.
Abstract Cholesterol ester transfer protein (CETP) promotes the transfer of cholesterol esters among different lipoprotein classes–high-density lipoproteins (HDL), very-low-density lipoproteins, intermediate-density lipoproteins, and low-density lipoproteins (LDL). The current study was carried out to determine whether CETP activities are correlated with lipoprotein cholesterol levels in a large number of patients having elevated LDL cholesterol and normal triglycerides (hypercholesterolemia) and elevated LDL cholesterol and high triglycerides (combined hyperlipidemia). Compared with 50 normolipidemic male patients, 113 hypercholesterolemic patients had a 42% higher mean activity of CETP, and approximately 60% of these patients had CETP activities outside the normal range. A similar elevation of CETP was observed in 47 patients with combined hyperlipidemia. Furthermore, in those with combined hyperlipidemia, CETP activities were highly correlated with LDL cholesterol, non-HDL cholesterol, and non-HDL/HDL ratios. Similar high correlations were obtained by combining normotriglyceridemic patients with and without elevated LDL cholesterol. Since patients with elevated LDL cholesterol had a significantly lower mean level of HDL cholesterol, a high CETP activity also was related to a reduced HDL cholesterol level. Our results are consistent with this concept, although they do not constitute final proof that high CETP activities contribute to elevated cholesterol concentrations and reduced HDL cholesterol levels in patients with hypercholesterolemia and in those with combined hyperlipidemia.
Key Words: hypercholesterolemia • combined hyperlipidemia • cholesterol ester transfer protein
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