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Nicotinamide Adenine Dinucleotide Protects against Spinal Cord Ischemia Reperfusion Injury-Induced Apoptosis by Blocking Autophagy
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Nicotinamide Adenine Dinucleotide Protects against Spinal Cord Ischemia Reperfusion Injury-Induced Apoptosis by Blocking Autophagy
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Journal Article
Nicotinamide Adenine Dinucleotide Protects against Spinal Cord Ischemia Reperfusion Injury-Induced Apoptosis by Blocking Autophagy
2017
Overview
The role of autophagy, neuroprotective mechanisms of nicotinamide adenine dinucleotide (NAD+), and their relationship in spinal cord ischemic reperfusion injury (SCIR) was assessed. Forty-eight Sprague-Dawley rats were divided into four groups: sham, ischemia reperfusion (I/R), 10 mg/kg NAD+, and 75 mg/kg NAD+. Western blotting, immunofluorescence, and immunohistochemistry were used to assess autophagy and apoptosis. Basso, Beattie, and Bresnahan (BBB) scores were used to assess neurological function. Expression levels of Beclin-1, Atg12-Atg5, LC3B-II, cleaved caspase 3, and Bax were upregulated in the I/R group and downregulated in the 75 mg/kg NAD+ group; p-mTOR, p-AKT, p62, and Bcl-2 were downregulated in the I/R group and upregulated in the 75 mg/kg NAD+ group. Numbers of LC3B-positive, caspase 3-positive, Bax-positive, and TUNEL-positive cells were significantly increased in the I/R group and decreased in the 75 mg/kg NAD+ group. The mean integrated option density of Bax increased and that of Nissl decreased in the I/R group, and it decreased and increased, respectively, in the 75 mg/kg NAD+ group. BBB scores significantly increased in the 75 mg/kg NAD+ group relative to the I/R group. No difference was observed between I/R and 10 mg/kg NAD+ groups for these indicators. Therefore, excessive and sustained autophagy aggravates SCIR; administration of NAD+ alleviates injury.
Publisher
Hindawi Publishing Corporation,Hindawi,John Wiley & Sons, Inc
Subject
/ bcl-2-Associated X Protein - metabolism
/ Down-Regulation - drug effects
/ Ischemia
/ Male
/ Neuroprotective Agents - pharmacology
/ Neuroprotective Agents - therapeutic use
/ Proteins
/ Proto-Oncogene Proteins c-akt - metabolism
/ Purines
/ Rats
/ Reperfusion Injury - drug therapy
/ Rodents
/ Spinal Cord Ischemia - pathology
/ Studies
