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miR-411 suppresses acute spinal cord injury via downregulation of Fas ligand in rats.

OBJECTIVE: To explore the role of miR-411/FasL in acute spinal cord injury (ASCI).

METHODS: The ASCI rat model was established, and expression of miR-411 and Fas ligand (FasL) was examined. Basso, Beattie and Bresnahan (BBB) score was used to evaluate the rats' neurological function. PC12 oxygen-glucose deprivation (OGD) model was also established. Gene manipulation (including miR-411 mimic or inhibitor) was used to modulate gene expression. Luciferase reporter assay was conducted to confirm the targeting relationship between miR-411 and FasL. Flow cytometry was applied in the measurement of PC12 cell apoptosis. Finally, the miR-411 mimic was injected into the vertebral canal of ASCI rats to determine the effects of miR-411 in vivo.

RESULTS: Compared with sham group, the expression of miR-411 and FasL was significantly decreased and increased in ASCI group, respectively (P < 0.05). Similarly, the expression of miR-411 and FasL was significantly lower and higher in OGD group than that in control group, respectively (P < 0.05). miR-411 directly controlled the FasL expression. miR-411 mimic can dramatically reduce the increased percentage of apoptosis cells caused by OGD when comparing to mimic control, which was greatly reversed by the overexpression of FasL (P < 0.05). Further, the BBB score was significantly elevated in the miR-411 mimic group when comparing to mimic control group, with decreased FasL expression (P < 0.05).

CONCLUSION: miR-411 mimic suppressed PC12 cell apoptosis via FasL, and relieved ASCI in rats.

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