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Changes in the expression of IL-6-Mediated MicroRNAs in the dorsal root ganglion under neuropathic pain in mice.

Synapse. 2016 Aug;70(8):317-24. doi:10.1002/syn.21902. Epub 2016 Jun 03
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摘要


A multiplex analysis for profiling the expression of candidate microRNAs (miRNAs), which are small noncoding RNAs that function as key post-transcriptional regulators, may lead to a better understanding of the complex machinery of neuropathic pain. In the present study, we performed a miRNA array analysis using tissues of the dorsal root ganglion (DRG), a primary site for pain processing, obtained from mice with partial sciatic nerve ligation. Among 1135 total miRNAs, 26 miRNAs showed up-regulation (more than 2-fold change) and only 4 miRNAs showed down-regulation (less than 0.5-fold change) in the DRG of nerve-ligated mice. In a RT-qPCR assay, the levels of miR-21, miR-431, and miR-511-3p were significantly increased on the ipsilateral side of the DRG from 3 to 7 days after sciatic nerve ligation. These elevations were almost absent in IL-6 knockout mice. Furthermore, the expression level of miR-21, but not those of miR-431 or miR511-3p, was significantly increased in exosomes extracted from blood of nerve-ligated mice. These findings suggest that the increased expression of IL-6-regulated miR-21, miR-431, and miR-511-3p in the DRG and increased exosomal miR-21 extracted from blood after sciatic nerve ligation may play at least a partial role in neuropathic pain. Synapse 70:317-324, 2016. © 2016 Wiley Periodicals, Inc.

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