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Exosomes derived from miR-544-modified mesenchymal stem cells promote recovery after spinal cord injury
Chenggang Li1, Xiao Li2, Bichun Zhao2
1Department of Orthopaedics, Second Hospital Shanxi Medical University, Taiyuan, China.
Abstract:
Recent evidence has demonstrated that exosomes derived from mesenchymal stem cells (MSCs) may serve as a reservoir of miRNAs conferring protection from certain diseases. Hence, the current study was performed with the aim of investigating whether MSCs-exosomal miR-544 could exert protection against spinal cord injury (SCI). In the present study, bone mesenchymal stem cells (BMSCs) isolated from rat bone marrows were transfected with miR-544 mimic. The miR-544-overexpressing BMSCs-derived exosomes (BMSC-Exo) were intravenously injected into SCI model rats. Neurological function, histopathological changes, and the release of inflammatory cytokines were further examined. Results showed that BMSCs-exosomal miR-544 mitigated neural functional recovery after SCI. Moreover, overexpression of miR-544 in BMSC-Exo abated histologic deficits and neuronal loss caused by SCI. Notably, this therapeutic intervention also reduced inflammation following SCI. In conclusion, exosomes derived from miR-544-overexpressing BMSCs improved functional recovery and promoted neuronal survival by attenuating inflammation after SCI.
Insights
Mesenchymal stem cell-derived exosomes carrying miR-544 show promise in treating spinal cord injury (SCI). This therapy improved neurological function and reduced inflammation and neuronal loss in SCI model rats.
Area of Science:
- Regenerative Medicine
- Neuroscience
- Cell Biology
Background:
- Mesenchymal stem cells (MSCs) release exosomes containing microRNAs (miRNAs) with therapeutic potential.
- Exosomes may protect against diseases, but their role in spinal cord injury (SCI) requires further investigation.
- Specific miRNAs within MSC-exosomes could offer targeted protection for SCI.
Purpose of the Study:
- To investigate the protective effects of miR-544 delivered via bone mesenchymal stem cell-derived exosomes (BMSC-Exo) against SCI.
- To determine if BMSC-Exo overexpressing miR-544 can improve neurological function and reduce SCI-induced damage.
- To assess the impact of this therapy on inflammation and neuronal survival post-SCI.
Main Methods:
- Bone mesenchymal stem cells (BMSCs) were isolated and transfected with a miR-544 mimic.
- Exosomes were derived from miR-544-overexpressing BMSCs (BMSC-Exo).
- BMSC-Exo were intravenously administered to rats with induced SCI, followed by assessments of neurological function, histology, and cytokine levels.
Main Results:
- BMSCs-exosomal miR-544 administration improved neurological functional recovery in SCI rats.
- Overexpression of miR-544 in BMSC-Exo significantly reduced SCI-induced histological damage and neuronal loss.
- The therapeutic intervention led to a notable reduction in post-SCI inflammatory cytokine release.
Conclusions:
- Exosomes derived from miR-544-overexpressing BMSCs demonstrate therapeutic efficacy for spinal cord injury.
- This exosome-based therapy promotes neuronal survival and functional recovery by attenuating inflammation.
- MSCs-exosomal miR-544 represents a promising therapeutic strategy for managing spinal cord injury.
