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
Atherosclerosisjournal_title
Atherosclerosisauthors
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 Bdoi
10.1016/j.atherosclerosis.2016.05.004subject
Has Abstractpub_date
2016-08-01 00:00:00pages
339-347eissn
0021-9150issn
1879-1484pii
S0021-9150(16)30164-2journal_volume
251pub_type
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