MicroRNA-146a Promotes Oligodendrogenesis in Stroke
Xian Shuang Liu1, Michael Chopp2,3, Wan Long Pan2,4
1Department of Neurology, Henry Ford Health System, Detroit, MI, 48202, USA. xsliu@neuro.hfh.edu.
Abstract:
Stroke induces new myelinating oligodendrocytes that are involved in ischemic brain repair. Molecular mechanisms that regulate oligodendrogenesis have not been fully investigated. MicroRNAs (miRNAs) are small non-coding RNA molecules that post-transcriptionally regulate gene expression. MiR-146a has been reported to regulate immune response, but the role of miR-146a in oligodendrocyte progenitor cells (OPCs) remains unknown. Adult Wistar rats were subjected to the right middle cerebral artery occlusion (MCAo). In situ hybridization analysis with LNA probes against miR-146a revealed that stroke considerably increased miR-146a density in the corpus callosum and subventricular zone (SVZ) of the lateral ventricle of the ischemic hemisphere. In vitro, overexpression of miR-146a in neural progenitor cells (NPCs) significantly increased their differentiation into O4+ OPCs. Overexpression of miR-146a in primary OPCs increased their expression of myelin proteins, whereas attenuation of endogenous miR-146a suppressed generation of myelin proteins. MiR-146a also inversely regulated its target gene-IRAK1 expression in OPCs. Attenuation of IRAK1 in OPCs substantially increased myelin proteins and decreased OPC apoptosis. Collectively, our data suggest that miR-146a may mediate stroke-induced oligodendrogenesis.
Insights
MicroRNA-146a (miR-146a) promotes oligodendrocyte regeneration after stroke. This microRNA enhances myelin repair by regulating IRAK1, offering a potential therapeutic target for ischemic brain injury.
Area of Science:
- Neuroscience
- Molecular Biology
- Regenerative Medicine
Background:
- Stroke triggers oligodendrocyte generation, crucial for ischemic brain repair.
- The molecular regulation of oligodendrogenesis remains incompletely understood.
- MicroRNAs (miRNAs) are key post-transcriptional regulators, with miR-146a's role in oligodendrocyte progenitor cells (OPCs) unexplored.
Purpose of the Study:
- To investigate the role of miR-146a in stroke-induced oligodendrogenesis.
- To elucidate the molecular mechanisms by which miR-146a influences OPCs and myelin repair.
Main Methods:
- Middle cerebral artery occlusion (MCAo) model in adult Wistar rats.
- In situ hybridization to detect miR-146a expression in the ischemic brain.
- In vitro studies involving overexpression and attenuation of miR-146a and IRAK1 in neural progenitor cells (NPCs) and OPCs.
Main Results:
- Stroke significantly increased miR-146a density in the corpus callosum and subventricular zone of the ischemic hemisphere.
- Overexpression of miR-146a enhanced NPC differentiation into O4+ OPCs and promoted myelin protein expression in OPCs.
- MiR-146a inversely regulated its target gene IRAK1; IRAK1 attenuation increased myelin proteins and reduced OPC apoptosis.
Conclusions:
- MiR-146a plays a significant role in promoting stroke-induced oligodendrogenesis.
- MiR-146a influences OPC differentiation and myelin production, potentially via IRAK1 regulation.
- MiR-146a emerges as a potential mediator of ischemic brain repair through enhanced myelination.
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