Journal
NEURAL REGENERATION RESEARCH
Volume 17, Issue 9, Pages 2022-2028Publisher
WOLTERS KLUWER MEDKNOW PUBLICATIONS
DOI: 10.4103/1673-5374.335164
Keywords
apoptosis; caspase-9; inflammation; interleukin-1 beta; microRNA-101a-3p; MYCN; nerve cells; p53; spinal cord ischemia/reperfusion injury
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miR-101a-3p regulates nerve cell apoptosis and inflammation in spinal cord ischemia/reperfusion injury by inhibiting MYCN and the p53 signaling pathway. miR-101a-3p mimic therapy may be a potential treatment option for spinal cord ischemia/reperfusion injury.
miR-101a-3p is expressed in a variety of organs and tissues and plays a regulatory role in many diseases, but its role in spinal cord ischemia/reperfusion injury remains unclear. In this study, we established a rat model of spinal cord ischemia/reperfusion injury by clamping the aortic arch for 14 minutes followed by reperfusion for 24 hours. Results showed that miR-101a-3p expression in L4-L6 spinal cord was greatly decreased, whereas MYCN expression was greatly increased. Dual-luciferase reporter assay results showed that miR-101a-3p targeted MYCN. MYCN immunoreactivity, which was primarily colocalized with neurons in L4-L6 spinal tissue, greatly increased after spinal cord ischemia/reperfusion injury. However, intrathecal injection of an miR-101a-3p mimic within 24 hours before injury decreased MYCN, p53, caspase-9 and interleukin-1 beta expression, reduced p53 immunoreactivity, reduced the number of MYCN/NeuN-positive cells and the number of necrotic cells in L4-L6 spinal tissue, and increased Tarlov scores. These findings suggest that the miR-101a-3p mimic improved spinal ischemia/reperfusion injury-induced nerve cell apoptosis and inflammation by inhibiting MYCN and the p53 signaling pathway. Therefore, miR-101a-3p mimic therapy may be a potential treatment option for spinal ischemia/reperfusion injury.
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