Specific enrichment of 2-arachidonoyl-lysophosphatidylcholine in carotid atheroma plaque from type 2 diabetic patients.

Abstract:

BACKGROUND AND AIMS:Diabetic patients are at high risk of stroke and coronary artery disease. Recent data suggest that arachidonic acid metabolism is altered in diabetic conditions and that these alterations contribute to accelerated atherosclerosis. Little is known about how these alterations affect the metabolism and the proportions of different lipid species within the atherosclerotic plaque. The aim of our study was to perform a targeted lipidomic analysis of human atherosclerotic lesions, with a specific focus on PUFA-containing lipid species, to reveal differences in the fatty-acid composition of plaque in diabetic patients compared with non-diabetic controls. METHODS:Carotid atheroma plaque samples were obtained from 31 diabetic and 48 non-diabetic patients undergoing carotid endarterectomy. Targeted lipidomic analysis was then performed to determine the fatty acid composition of major glycerophospholipids and cholesteryl ester species by liquid chromatography-tandem mass spectrometry. RESULTS:Atheroma plaques from diabetic patients were significantly enriched with 2-arachidonoyl-lysophosphatidylcholine (2-AA-LPC) (2.3 ± 0.8% Vs. 1.8 ± 0.6% p = 0.0002). Multivariable logistic regression showed that an increased 2-AA-LPC level was independently associated with diabetes. Finally, a positive relationship was found between 2-AA-LPC and HbA1c levels. Interestingly, endothelial lipase and calcium independent PLA2 gamma which could account for the production of 2-AA-LPC were detected in carotid plaques by immunohistochemistry. CONCLUSIONS:2-AA-LPC stands at the crossroads of major metabolic pathways that lead to the synthesis of bioactive molecules such as AA-derived eicosanoids, 2-AA-lysophosphatidic acid and 2-AA-glycerol. 2-AA-LPC therefore appears to be a promising molecule to investigate in the context of diabetes.

journal_name

Atherosclerosis

journal_title

Atherosclerosis

authors

Ménégaut L,Masson D,Abello N,Denimal D,Truntzer C,Ducoroy P,Lagrost L,Pais de Barros JP,Athias A,Petit JM,Martin L,Steinmetz E,Kretz B

doi

10.1016/j.atherosclerosis.2016.05.004

subject

Has Abstract

pub_date

2016-08-01 00:00:00

pages

339-347

eissn

0021-9150

issn

1879-1484

pii

S0021-9150(16)30164-2

journal_volume

251

pub_type

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