Study of fluidity of low density lipoproteins from liver cirrhotic patients.
OBJECTIVE
Liver disease is accompanied by major quantitative and qualitative modifications in plasma lipoprotein metabolism. Alterations in plasma lipoprotein composition and a lower susceptibility to in vitro peroxidation of low density lipoprotein (LDL) and erythrocyte membranes have been observed in liver cirrhosis. The main objective of the present work was to investigate LDL chemical composition and fluidity in liver cirrhosis using the fluorescence polarization (Pf) of the 1,6-diphenyl-1,3,5-hexatriene (DPH) probe.


RESULTS
The chemical composition of LDL was studied in 12 cirrhotic patients and 22 controls by conventional methods and its fatty acid composition by gas chromatography. LDL fluidity was determined by measuring the DPH Pf values. A decrease in molecular order was demonstrated by the significant (p < 0.05) decrease in Pf values in the cirrhotics. Modifications in LDL fluidity are correlated with its composition. A significant increase in triglyceride content (p < 0.05), and significant increases in triglyceride/protein and triglyceride/phospholipid ratios were observed in the cirrhotics.


CONCLUSIONS
Our results demonstrate that the higher LDL fluidity of cirrhotic patients may be due to an increased triglyceride content.
Taus
M
M
Institute of Biochemistry, Faculty of Medicine, Ancona, Italy.
Dousset
N
N
Moreau
J
J
Ferretti
G
G
Galeazzi
T
T
Soléra
M L
ML
Curatola
G
G
Valdiguié
P
P
D016022:Case-Control Studies; D002849:Chromatography, Gas; D004161:Diphenylhexatriene; D004910:Erythrocyte Membrane / Q000378:metabolism; D005260:Female; D005456:Fluorescent Dyes; D006801:Humans; D015227:Lipid Peroxidation; D008055:Lipids / Q000097:blood; D008077:Lipoproteins, LDL / Q000097:blood* / Q000378:metabolism; D008103:Liver Cirrhosis / Q000097:blood* / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D012044:Regression Analysis
D005456:Fluorescent Dyes; D008055:Lipids; D008077:Lipoproteins, LDL; D004161:Diphenylhexatriene