A simple and highly sensitive radioenzymatic assay for lysophosphatidic acid quantification

Abstract

The objective of the present work was to develop a simple and sensitive radioenzymatic assay to quantify lysophosphatidic acid (LPA). For that, a recombinant rat LPA acid acyltransferase (LPAAT) produced in Escherichia coli was used. In the presence of [14C]oleoyl-CoA, LPAAT selectively catalyzes the transformation of LPA and alkyl-LPA into [14C]phosphatidic acid. Acylation of LPA was complete and linear from 0 to 200 pmol with a minimal detection of 0.2 pmol. This method was used to quantify LPA in butanol-extracted lipids from bovine sera, as well as from human and mouse plasma. This radioenzymatic assay represents a new, simple, and highly sensitive method to quantify LPA in various biological fluids.—Saulnier-Blache, J. S., A. Girard, M-F. Simon, M. Lafontan, and P. Valet. A simple and highly sensitive radioenzymatic assay for lysophosphatidic acid quantification. J. Lipid Res. 2000. 41: 1947–1951.

Keywords

• radioenzymatic detection
• lysophosphatidic acid acyltransferase
• phosphatidic acid
• serum
• plasma
• [14C]oleoyl-CoA