Erschienen in:
01.09.2020 | Original Contribution
NAD+ administration decreases microvascular damage following cardiac ischemia/reperfusion by restoring autophagic flux
verfasst von:
You-Jun Zhang, Mingchao Zhang, Xiaona Zhao, Kailei Shi, Maoqing Ye, Jiawen Tian, Shaofeng Guan, Weihai Ying, Xinkai Qu
Erschienen in:
Basic Research in Cardiology
|
Ausgabe 5/2020
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Abstract
Microvascular damage is a key pathological change in myocardial ischemia/reperfusion (I/R) injury. Using a rat model of myocardial I/R, our current study has provided the first evidence that nicotinamide adenine dinucleotide (NAD+) administration can significantly attenuate myocardial I/R-induced microvascular damage, including reduced regional blood perfusion, decreased microvessel density and integrity, and coronary microvascular endothelial cells (CMECs) injury. In studies with primary cultured CMECs under hypoxia/reoxygenation (HR) and a rat model of I/R, our results suggested that the protective effect of NAD+ on CMECs exposed to HR or I/R is at least partially mediated by the NAD+-induced restoration of autophagic flux, especially lysosomal autophagy: NAD+ treatment markedly induced transcription factor EB (TFEB) activation and attenuated lysosomal dysfunction in the I/R or HR-exposed cells. Collectively, our study has provided the first in vivo and in vitro evidence that NAD+ significantly rescued the impaired autophagic flux and cell apoptosis that was induced by I/R in rat CMECs, which is mediated in part through the action of TFEB-mediated lysosomal autophagy.