Lipid composition of HDL subfractions in dog plasma and lymph.
We report the lipid composition of dog plasma and peripheral lymph lipoproteins as separated into pre-beta, alpha, and pre-alpha fractions by agarose gel electrophoresis. Plasma lipoproteins with alpha mobility have a composition different from that of plasma lipoproteins with pre-alpha mobility, having 9% versus 11% free cholesterol, 21% versus 17% cholesterol ester, 1% versus 16% triacylglycerol, and 69% versus 56% phospholipid. On the other hand, lymph alpha and pre-alpha lipoproteins have compositions that are quite similar (9% versus 7% free cholesterol, 17% versus 17% cholesterol ester, 2% versus 4% triacylglycerol, and 71% versus 71% phospholipid). The lipid compositions of plasma and lymph alpha lipoproteins are quite similar (9% versus 9% free cholesterol, 21% versus 17% cholesterol ester, 1% versus 2% triacylglycerol, and 70% versus 72% phospholipid). The lipid compositions of plasma and lymph pre-alpha lipoproteins are different (11% versus 7% free cholesterol, 17% versus 17% cholesterol ester, 16% versus 4% triacylglycerol, and 56% versus 71% phospholipid). Peripheral lymph lipoproteins with pre-beta mobility contained 15% cholesterol, 13% cholesterol ester, 10% triacylglycerol, and 61% phospholipid. Compared with plasma, peripheral lymph lipoproteins are free cholesterol-enriched in all fractions. Calculated stoichiometric ratios of lipid to apoA-I per particle, alpha lipoproteins have two molecules of apoA-I per particle, and pre-alpha lipoproteins have four molecules of apoA-I per particle.
Wong
L
L
Department of Physiology, Louisiana State University Medical Center, New Orleans 70112, USA.
Sivok
B
B
Kurucz
E
E
Sloop
C H
CH
Roheim
P S
PS
Asztalos
B
B
D000818:Animals; D016632:Apolipoprotein A-I / Q000737:chemistry; D004285:Dogs; D005260:Female; D008055:Lipids / Q000097:blood* / Q000737:chemistry; D008075:Lipoproteins, HDL / Q000097:blood* / Q000737:chemistry; D008196:Lymph / Q000378:metabolism*; D015394:Molecular Structure; D008970:Molecular Weight
D016632:Apolipoprotein A-I; D008055:Lipids; D008075:Lipoproteins, HDL