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Published on: March 24, 2020
Effect of Dynamin-2 Gene Modified OECs on Functional and Molecular Neuroprotection After Spinal Cord Injury in Rats
Zhijie Yin1, Zhiyong Zhang1, Haiming Li2,3
1Department of Neurosurgery, The First Affiliated Hospital of Xinxiang Medical University, Weihui, Henan, 453100, China.
Abstract:
Spinal cord injury (SCI) imposes a significant economic burden on individuals and society, with limited options for repairing the central nervous system after injury. Cell transplantation therapy, particularly using olfactory ensheathing cells (OECs), has shown promise. However, the neuroprotective mechanisms underlying genetically modified OECs remain unclear. This study aimed to investigate the effects of Dynamin-2 (Dnm2) gene-modified OECs (Dnm2-OECs) on SCI repair in a rat model. OECs were harvested from three-day-old rats. Adult rats were divided into sham, SCI, SCI-OEC, and SCI-Dnm2-OECs groups. Dnm2-OECs were transplanted one day post-SCI model, and recovery was assessed through BBB scores, histological analyses, and molecular markers of inflammation. Results showed that the purity and infection efficiency of OECs were 87.28 ± 7.65% and 89.04 ± 5.56%, respectively. Dnm2-OECs survived for at least 28 days post-transplantation and significantly improved BBB scores by day 21. Additionally, neuronal counts increased, syringomyelia decreased, demyelination lessened, and mitochondrial structure improved. Dnm2 levels rose in spinal tissue, while NF-κB pathway proteins and pro-inflammatory cytokines (TRAF6, IL-17, IL-1β and TNF-α) were reduced. Microglial cells (Iba1) decreased correspondingly. These results indicate that Dnm2-OECs transplantation enhances neurological recovery after by inhibiting the NF-κB signaling pathway, offering a potential therapeutic strategy for SCI repair.
Insights
Genetically modifying olfactory ensheathing cells (OECs) with Dynamin-2 (Dnm2) improved spinal cord injury (SCI) recovery in rats. Dnm2-OECs transplantation reduced inflammation and enhanced neurological function, offering a promising therapeutic approach for SCI.
Area of Science:
- Neuroscience
- Regenerative Medicine
- Cell Therapy
Background:
- Spinal cord injury (SCI) presents significant challenges due to limited central nervous system repair options.
- Olfactory ensheathing cells (OECs) show therapeutic potential, but their neuroprotective mechanisms, especially when genetically modified, require further elucidation.
Purpose of the Study:
- To investigate the therapeutic effects of Dynamin-2 (Dnm2) gene-modified OECs (Dnm2-OECs) in a rat model of SCI.
- To explore the underlying neuroprotective mechanisms of Dnm2-OECs in SCI repair.
Main Methods:
- OECs were genetically modified to express Dynamin-2 (Dnm2-OECs).
- Dnm2-OECs were transplanted into adult rats one day after SCI induction.
- Recovery was assessed using behavioral tests (BBB scores), histological analysis, and molecular markers of inflammation and neuronal integrity.
Main Results:
- Dnm2-OECs demonstrated high purity and infection efficiency, with sustained survival post-transplantation.
- Significant improvements in locomotor function (BBB scores) were observed by day 21 post-transplantation.
- Histological analysis revealed increased neuronal counts, reduced syringomyelia and demyelination, and improved mitochondrial structure.
- Dnm2-OECs transplantation suppressed the NF-κB signaling pathway, reducing pro-inflammatory cytokines (TRAF6, IL-17, IL-1β, TNF-α) and microglial activation (Iba1).
Conclusions:
- Dynamin-2 gene modification enhances the therapeutic potential of OECs for SCI.
- Dnm2-OECs transplantation promotes neurological recovery by inhibiting inflammatory pathways, particularly NF-κB signaling.
- This study presents Dnm2-OECs as a viable cell-based therapeutic strategy for spinal cord injury repair.
