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• W2893869784 abstract "BackgroundMicroRNA(miR)-204 is an autophagy- and apoptosis-related gene. Neuroprotection by the inhibition of miR-204 against spinal cord ischemia was evaluated, and the roles of neuronal autophagy and apoptosis were investigated.MethodsSpinal cord ischemia was conducted in rats by cross-clamping the descending aorta for 14 minutes. Inhibition of miR-204 was induced by intrathecal injection of lentivirus vectors containing antagomiR-204. Hind-limb motor function was assessed with the motor deficit index. Lumbar spinal cords were harvested for histologic examinations and terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick-end labeling staining. Autophagy was evaluated by the LC3-II/LC3-I ratio and beclin-1 expression. Expressions of LC3-I, LC3-II, beclin-1, B-cell lymphoma-2 (BCL-2), caspase-3, and miR-204 were measured by Western blot and quantitative real-time polymerase chain reaction. Autophagy was blocked by 3-methyladenine.ResultsTransient ischemia enhanced miR-204 expression and the LC3-II/LC3-I ratio and downregulated BCL-2 expression in spinal cords in a time-dependent manner. AntagomiR-204 significantly reduced expressions of miR-204 and caspase-3, dramatically upregulated expressions of beclin-1 and BCL-2 and the LC3-II/LC3-I ratio in spinal cords after reperfusion. Compared with controls, inhibition of miR-204 markedly decreased the motor deficit index scores at 6, 12, 24, and 48 hours after reperfusion; increased the number of viable motor neurons; and decreased the number of apoptotic neurons. 3-Methyladenine completely abolished enhancements of the LC3-II/LC3-I ratio and beclin-1 expression induced by antagomiR-204 and inhibited the protective effect on hind-limb motor function.ConclusionsInhibition of miR-204 exerts spinal cord protection against ischemia-reperfusion injury, possibly via promotion of autophagy and antiapoptotic effects. MicroRNA(miR)-204 is an autophagy- and apoptosis-related gene. Neuroprotection by the inhibition of miR-204 against spinal cord ischemia was evaluated, and the roles of neuronal autophagy and apoptosis were investigated. Spinal cord ischemia was conducted in rats by cross-clamping the descending aorta for 14 minutes. Inhibition of miR-204 was induced by intrathecal injection of lentivirus vectors containing antagomiR-204. Hind-limb motor function was assessed with the motor deficit index. Lumbar spinal cords were harvested for histologic examinations and terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick-end labeling staining. Autophagy was evaluated by the LC3-II/LC3-I ratio and beclin-1 expression. Expressions of LC3-I, LC3-II, beclin-1, B-cell lymphoma-2 (BCL-2), caspase-3, and miR-204 were measured by Western blot and quantitative real-time polymerase chain reaction. Autophagy was blocked by 3-methyladenine. Transient ischemia enhanced miR-204 expression and the LC3-II/LC3-I ratio and downregulated BCL-2 expression in spinal cords in a time-dependent manner. AntagomiR-204 significantly reduced expressions of miR-204 and caspase-3, dramatically upregulated expressions of beclin-1 and BCL-2 and the LC3-II/LC3-I ratio in spinal cords after reperfusion. Compared with controls, inhibition of miR-204 markedly decreased the motor deficit index scores at 6, 12, 24, and 48 hours after reperfusion; increased the number of viable motor neurons; and decreased the number of apoptotic neurons. 3-Methyladenine completely abolished enhancements of the LC3-II/LC3-I ratio and beclin-1 expression induced by antagomiR-204 and inhibited the protective effect on hind-limb motor function. Inhibition of miR-204 exerts spinal cord protection against ischemia-reperfusion injury, possibly via promotion of autophagy and antiapoptotic effects." @default.
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• W2893869784 date "2019-01-01" @default.
• W2893869784 modified "2023-09-25" @default.
• W2893869784 title "Inhibition of MicroRNA-204 Conducts Neuroprotection Against Spinal Cord Ischemia" @default.
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• W2893869784 doi "https://doi.org/10.1016/j.athoracsur.2018.07.082" @default.
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