NAD + Levels Are Augmented in Aortic Tissue of ApoE −/− Mice by Dietary Omega-3 Fatty Acids

Abstract

Background: Maintaining bioenergetic homeostasis provides a means to reduce the risk of cardiovascular events during chronological aging. Nicotinamide adenine dinucleotide (NAD + ) acts as a signaling molecule, and its levels were used to govern several biological pathways, for example, promoting angiogenesis by SIRT1 (sirtuin 1)-mediated inhibition of Notch signaling to rejuvenate capillary density of old-aged mice. NAD + modulation shows promise in the vascular remodeling of endothelial cells. However, NAD + distribution in atherosclerotic regions remains uncharacterized. Omega-3 polyunsaturated fatty acids consumption, such as docosahexaenoic acid and eicosapentaenoic acid, might increase the abundance of cofactors in blood vessels due to omega-3 polyunsaturated fatty acids metabolism. Methods: Apolipoprotein E-deficient ( ApoE −/− ) mice were fed a Western diet, and the omega-3 polyunsaturated fatty acids-treated groups were supplemented with docosahexaenoic acid (1%, w/w) or eicosapentaenoic acid (1%, w/w) for 3 weeks. Desorption electrospray ionization mass spectrometry imaging was exploited to detect exogenous and endogenous NAD + imaging. Results: NAD + , NADH, NADP + , NADPH, FAD + , FADH, and nicotinic acid adenine dinucleotide of the aortic arches were detected higher in the omega-3 polyunsaturated fatty acids-treated mice than the nontreated control. Comparing the distribution in the outer and inner layers of the arterial walls, only NADPH was detected slightly higher in the outer part in eicosapentaenoic acid-treated mice. Conclusions: Supplementation of adding docosahexaenoic acid or eicosapentaenoic acid to the Western diet led to a higher NAD + , FAD + , and their metabolites in the aortic arch. Considering the pleiotropic roles of NAD + in biology, this result serves as a beneficial therapeutic strategy in the animal model counter to pathological conditions.