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Journal of Lipid Research, Vol 26, 1252-1268, Copyright © 1985 by Lipid Research, Inc.

ARTICLES

Characterization of plasma lipoproteins of grain- and cholesterol-fed White Carneau and Show Racer pigeons

HA Barakat and RW St. Clair

Plasma cholesterol concentrations from White Carneau (WC) and Show Racer (SR) pigeons consuming a cholesterol-free grain diet averaged about 300 mg/dl, approximately 200 mg/dl as high density lipoproteins (HDL) and the remainder as low density lipoproteins (LDL). Consumption of a cholesterol-containing diet increased plasma cholesterol concentrations in both breeds to greater than 2000 mg/dl. Approximately one-half of this increase was as LDL with the remainder as beta- migrating very low density lipoproteins (beta-VLDL). There was little change in HDL concentration. LDL from cholesterol-fed animals had a greater net negative charge than control LDL, and was larger (Mr = 10 X 10(6) vs 3.2 X 10(60)) due to an increase in the number of cholesteryl ester molecules per particle. The principal apoprotein of LDL was apoB- 100 with smaller amounts of apoA-I and several minor unidentified apoproteins. beta-VLDL was cholesteryl ester-rich, could be separated into two size populations by gel chromatography, and contained apoB-100 as its principal apoprotein. Apoprotein E was not detected in any of the plasma lipoproteins. HDL from control and cholesterol-fed animals was composed of a single class of particles with virtually identical composition resembling HDL2. The major apoprotein of HDL was apoA-I. There were no consistent quantitative or qualitative differences in the lipoproteins of the two breeds of pigeons that could help to explain the susceptibility to atherosclerosis of the WC or the resistance of the SR.
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