Quantification, characterization and fatty acid composition of lysophosphatidic acid in different rat tissues.

Abstract:

:The amount and composition of lysophosphatidate present in different rat tissues have been estimated by an internal standard method in which a synthetic unnatural isomer (1-heptadecanoyl-rac-glycerol-3-phosphate) was added to the total lipid extracts, and the fatty acid composition of purified lysophosphatidate was determined. Lipids from tissues were extracted under acidic conditions, and the lysophosphatidate was purified by solvent partitions followed by thin-layer chromatography in multiple solvent systems. The purified lipid was shown to be 1-acyl-sn-glycerol-3-phosphate by chromatographic and chemical analysis, by its resistance to hydrolysis when treated with phospholipase A2 and also by its complete conversion to 1-acyl-sn-glycerol when treated with alkaline phosphatase. The fatty acid constituents of this lipid were determined by gas-liquid chromatography of the derived methyl esters. The concentrations (nmol/g of tissue) of lysophosphatidate in various tissues were: 86.2 +/- 4.2 in brain, 60.3 +/- 6.3 in liver, 46.4 +/- 6.5 in kidney, 30.6 +/- 5.0 in testis, 22.3 in heart and 19.3 in lung. Mostly (80%) saturated fatty acids were found to be present in this lyso lipid. A significantly high level of stearic acid was present in this lipid from all the tissues (50-60% in liver, kidney, brain and testis, and about 40% in heart and lung) compared to palmitic acid (10-15% in liver, kidney and brain and 25-30% in testis, heart and lung). The fatty acid compositions of phosphatidic acid, the putative product of lysophosphatidate acylation, from different tissues were also determined and palmitate was found to be the major saturated fatty acid.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Lipids

journal_title

Lipids

authors

Das AK,Hajra AK

doi

10.1007/BF02535172

subject

Has Abstract

pub_date

1989-04-01 00:00:00

pages

329-33

issue

4

eissn

0024-4201

issn

1558-9307

journal_volume

24

pub_type

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