Dietary fatty acids augment tissue levels of n-acylethanolamines in n-acylphosphatidylethanolamine phospholipase D (NAPE-PLD) knockout mice.

Authors：Lin Lin; Metherel Adam H; Kitson Alex P; Alashmali Shoug M; Hopperton Kathryn E; Trepanier Marc-Olivier; Jones Peter J; Bazinet Richard P

Source：Journal of Nutritional Biochemistry, 2018, 62: 134-142.

DOI：10.1016/j.jnutbio.2018.08.015

• 1, 2-Arachidonoylglycerol
• Diet
• Fat composition
• Fatty acids
• Food intake
• n-Acyl-phosphatidylethanolamine phospholipase D
• n-Acylethanolamines

N-acylethanolamines (NAEs) are lipid signaling mediators, which can be synthesized from dietary fatty acids via n-acylphosphatidylethanolamine-phospholipase D (NAPE-PLD) and in turn influence physiological outcomes; however, the roles of NAPE-PLD upon dietary fatty acid modulation are not fully understood. Presently, we examine if NAPE-PLD is necessary to increase NAEs in response to dietary fatty acid manipulation. Post-weaning male wild-type (C57Bl/6), NAPE-PLD (-/+) and NAPE-PLD (-/-) mice received isocaloric fat diets containing either beef tallow, corn oil, canola oil or fish oil (10% wt/wt from fat) for 9 weeks. Brain docosahexaenoic acid (DHA) levels were higher (P<.01) in NAPE-PLD (-/+) (10.01+/-0.31 mumol/g) and NAPE-PLD (-/-) (10.89+/-0.61 mumol/g) than wild-type (7.72+/-0.61 mumol/g) consuming fish oil. In NAPE-PLD (-/-) mice, brain docosahexaenoylethanolamide (DHEA) levels were higher (P<.01) after fish oil feeding suggesting that NAPE-PLD was not necessary for DHEA synthesis. Liver and jejunum arachidonoylethanolamide, 1,2-arachidonoylglycerol and DHEA levels reflected their corresponding fatty acid precursors suggesting that alternate pathways are involved in NAE synthesis. NAPE-PLD (-/-) mice had lower oleoylethanolamide levels in the jejunum and a leaner phenotype compared to wild-type mice. Overall, these results demonstrate that dietary fatty acid can augment tissue NAEs in the absence of NAPE-PLD.

• Institution
  university of Toronto