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Updated: Jul 11, 2026
Intraspinal Cell Transplantation for Targeting Cervical Ventral Horn in Amyotrophic Lateral Sclerosis and Traumatic Spinal Cord Injury
Published on: September 18, 2011
IPSC-NSCs-derived exosomal let-7b-5p improves motor function after spinal cord Injury by modulating
Jie Liu1,2, Guang Kong3, Chenlin Lu4
1Department of Orthopaedics, Taizhou School of Clinical Medicine, The Affiliated Taizhou People's Hospital of Nanjing Medical University, Nanjing Medical University, 366 Taihu Road, Taizhou, Jiangsu, China.
Background:
Following spinal cord injury (SCI), the inflammatory storm initiated by microglia/macrophages poses a significant impediment to the recovery process. Exosomes play a crucial role in the transport of miRNAs, facilitating essential cellular communication through the transfer of genetic material. However, the miRNAs from iPSC-NSCs-Exos and their potential mechanisms leading to repair after SCI remain unclear. This study aims to explore the role of iPSC-NSCs-Exos in microglia/macrophage pyroptosis and reveal their potential mechanisms.
Methods:
iPSC-NSCs-Exos were characterized and identified using transmission electron microscopy (TEM), nanoparticle tracking analysis (NTA), and Western blot. A mouse SCI model and a series of in vivo and in vitro experiments were conducted to investigate the therapeutic effects of iPSC-NSCs-Exos. Subsequently, miRNA microarray analysis and rescue experiments were performed to confirm the role of miRNAs in iPSC-NSCs-Exos in SCI. Mechanistic studies were carried out using Western blot, luciferase activity assays, and RNA-ChIP.
Results:
Our findings revealed that iPSC-NSCs-derived exosomes inhibited microglia/macrophage pyroptosis at 7 days post-SCI, maintaining myelin integrity and promoting axonal growth, ultimately improving mice motor function. The miRNA microarray showed let-7b-5p to be highly enriched in iPSC-NSCs-Exos, and LRIG3 was identified as the target gene of let-7b-5p. Through a series of rescue experiments, we uncovered the connection between iPSC-NSCs and microglia/macrophages, revealing a novel target for treating SCI.
Conclusion:
In conclusion, we discovered that iPSC-NSCs-derived exosomes can package and deliver let-7b-5p, regulating the expression of LRIG3 to ameliorate microglia/macrophage pyroptosis and enhance motor function in mice after SCI. This highlights the potential of combined therapy with iPSC-NSCs-Exos and let-7b-5p in promoting functional recovery and limiting inflammation following SCI.
Insights
Induced pluripotent stem cell-neural stem cell-derived exosomes (iPSC-NSCs-Exos) reduce inflammation after spinal cord injury (SCI) by inhibiting microglia/macrophage pyroptosis. This promotes nerve repair and improves motor function in mice.
Area of Science:
- Neuroscience
- Regenerative Medicine
- Cell Biology
Background:
- Spinal cord injury (SCI) triggers neuroinflammation mediated by microglia/macrophages, hindering recovery.
- Exosomes facilitate intercellular communication via miRNA transfer, but their role in SCI repair is not fully understood.
- Investigating iPSC-NSCs-Exos' impact on microglia/macrophage pyroptosis is crucial for SCI therapeutics.
Purpose of the Study:
- To explore the therapeutic potential of iPSC-NSCs-Exos in a mouse SCI model.
- To elucidate the mechanisms by which iPSC-NSCs-Exos modulate microglia/macrophage pyroptosis.
- To identify specific miRNAs within iPSC-NSCs-Exos involved in SCI repair.
Main Methods:
- Characterization of iPSC-NSCs-Exos using TEM, NTA, and Western blot.
- In vivo and in vitro experiments on a mouse SCI model.
- miRNA microarray analysis and rescue experiments to determine miRNA function and target genes.
Main Results:
- iPSC-NSCs-Exos inhibited microglia/macrophage pyroptosis, preserved myelin, and promoted axonal growth in SCI mice.
- let-7b-5p was identified as a key miRNA enriched in iPSC-NSCs-Exos, targeting LRIG3.
- Functional rescue experiments confirmed the let-7b-5p/LRIG3 pathway's role in mitigating SCI-induced inflammation.
Conclusions:
- iPSC-NSCs-Exos deliver let-7b-5p to regulate LRIG3, reducing microglia/macrophage pyroptosis and improving motor function post-SCI.
- This study reveals a novel therapeutic mechanism for SCI involving exosomal miRNAs.
- Combined therapy with iPSC-NSCs-Exos and let-7b-5p shows promise for functional recovery and inflammation control in SCI.
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