Molecular species of phosphoglycerides in liver microsomes of rats fed a fat-free diet

被引:7
|
作者
Garda, HA
Bernasconi, AM
Tricerri, MA
Brenner, RR
机构
[1] Inst. Invest. Bioquimicas La Plata, CONICET-UNLP, Facultad de Ciencias Médicas
[2] Carrera del Investigador Cie., CONICET
[3] INIBIOLP, Facultad de Ciencias Médicas, 1900-La Plata
关键词
D O I
10.1007/s11745-997-0065-5
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The influence of a fat-free diet on the molecular species composition of phosphatidylcholine (PC), phosphatidylethanolamine (PE), and phosphatidylinositol (PI) of rat liver microsomes was studied by using reversed-phase high-pressure liquid chromatography. In the three phosphoglyceride classes analyzed, the fat-free diet produced a large decrease in the 18:0/20:4n-6 species but less important changes were found in the 16:0/20:4n-6 species. In PC, the most abundant phosphoglyceride class of rat liver microsomes, the fall in the 18:0/20:4n-6 species was counterbalanced mainly by an enhancement in the 16:0/18:1n-9 species although it was not evident in PE. In PI, the decrease in the 18:4/20:4n-6 species was counterbalanced by an increase in the 18:0/20:3n-9 species. Fluorescence polarization measurements of 1,6-diphenyl-1,3,5-hexatriene in liposomes of 16:0/18:1n-9-, 18:0/18:1n-9-, 16:0/20:4n-6-, and 18:0/20:4n-6-PC indicated that the change in the saturated fatty acid in the sn-1 position accompanying the replacement of 20:4n-6 by 18:1n-9 could be very important for a homeoviscous compensation, maintaining the membrane physical properties without large alterations in spite of the essential fatty acid deficiency due to the fat-free diet.
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页码:507 / 513
页数:7
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