Fang He1, Enyi Shi2, Lihui Yan3, Juchen Li3, Xiaojing Jiang4. 1. Department of Anesthesiology, Fourth Affiliated Hospital, China Medical University, Shenyang, People's Republic of China. 2. Department of Cardiac Surgery, First Affiliated Hospital, China Medical University, Shenyang, People's Republic of China. 3. Department of Anesthesiology, First Affiliated Hospital, China Medical University, Shenyang, People's Republic of China. 4. Department of Anesthesiology, First Affiliated Hospital, China Medical University, Shenyang, People's Republic of China. Electronic address: jiangsophie@hotmail.com.
Abstract
OBJECTIVE: Micro ribonucleic acids (miRNAs) are involved in a wide range of biological functions, in multiple tissues, including the central nervous system. We investigated a novel neuroprotective strategy of down-regulation of miR-320 in the spinal cord under the condition of transient ischemia. METHODS: Spinal cord ischemia was induced in rats by cross-clamping the descending aorta for 14 minutes. Lentivirus vectors containing antisense oligonucleotides of rat miR-320 (antagomiR-320) were transfected into the experimental rats by means of intrathecal injection, 5 days before spinal cord ischemia. Control lentivirus vectors, or the vehicle, were given to the control animals. Hind-limb motor function was assessed during 48 hours after ischemia, using the Motor Deficit Index (MDI), and histologic examination was performed. In parallel experiments, expressions of miR-320, and the phosphorylation state of heat-shock protein 20 (phospho-Hsp20) in the spinal cord were evaluated by quantitative real-time polymerase chain reaction and western blot analysis. RESULTS: The time courses of expressions of miR-320 and phospho-Hsp20 in the spinal cord, after the transient ischemia, indicated that expression of phospho-Hsp20 was negatively correlated with expression of miR-320. Transfection of antagomiR-320 significantly reduced expression of miR-320 in the spinal cord and dramatically up-regulated expression of phospho-Hsp20. Compared with controls, inhibition of miR-320 markedly improved hind-limb motor function, as evidenced by lower MDI scores, at 6, 12, 24, and 48 hours after reperfusion, and increased the number of intact motor neurons in the lumbar spinal cord. CONCLUSIONS: Inhibition of miR-320 induces neuroprotection in the spinal cord, against ischemia-reperfusion injury, possibly via up-regulation of phospho-Hsp20.
OBJECTIVE: Micro ribonucleic acids (miRNAs) are involved in a wide range of biological functions, in multiple tissues, including the central nervous system. We investigated a novel neuroprotective strategy of down-regulation of miR-320 in the spinal cord under the condition of transient ischemia. METHODS:Spinal cord ischemia was induced in rats by cross-clamping the descending aorta for 14 minutes. Lentivirus vectors containing antisense oligonucleotides of ratmiR-320 (antagomiR-320) were transfected into the experimental rats by means of intrathecal injection, 5 days before spinal cord ischemia. Control lentivirus vectors, or the vehicle, were given to the control animals. Hind-limb motor function was assessed during 48 hours after ischemia, using the Motor Deficit Index (MDI), and histologic examination was performed. In parallel experiments, expressions of miR-320, and the phosphorylation state of heat-shock protein 20 (phospho-Hsp20) in the spinal cord were evaluated by quantitative real-time polymerase chain reaction and western blot analysis. RESULTS: The time courses of expressions of miR-320 and phospho-Hsp20 in the spinal cord, after the transient ischemia, indicated that expression of phospho-Hsp20 was negatively correlated with expression of miR-320. Transfection of antagomiR-320 significantly reduced expression of miR-320 in the spinal cord and dramatically up-regulated expression of phospho-Hsp20. Compared with controls, inhibition of miR-320 markedly improved hind-limb motor function, as evidenced by lower MDI scores, at 6, 12, 24, and 48 hours after reperfusion, and increased the number of intact motor neurons in the lumbar spinal cord. CONCLUSIONS: Inhibition of miR-320 induces neuroprotection in the spinal cord, against ischemia-reperfusion injury, possibly via up-regulation of phospho-Hsp20.
Authors: Nikolay L Martirosyan; Alessandro Carotenuto; Arpan A Patel; M Yashar S Kalani; Kaan Yagmurlu; G Michael Lemole; Mark C Preul; Nicholas Theodore Journal: Front Surg Date: 2016-11-08
Authors: Aleksandra Wyciszkiewicz; Michal S Lach; Joanna P Wróblewska; Marcin Michalak; Wiktoria M Suchorska; Alicja Kalinowska; Slawomir Michalak Journal: EXCLI J Date: 2021-05-25 Impact factor: 4.068