1 Department of Neurosurgery, the Third Affiliated Hospital, Guangzhou Medical College, Guangzhou 510150, China 
2 Institute of Neurosurgery, Key Laboratory on Brain Function Repair and Regeneration of Guangdong, Southern Medical University, Guangzhou 510282, China 
3 Department of Neurosurgery, the Military General Hospital of Beijing PLA, Beijing 100700, China

Abstract 

Objective
To investigate the role of tyrosine kinase receptor C (TrkC), the receptor of neurotrophin-3 (NT-3), in neuroplasticity following spinal cord injury (SCI).
Methods
Rats with cord transection were allowed to survive for 1, 3, 7 and 14 d post operation (dpo). TrkC expressions at lower thoracic levels of the spinal cord and in precentral gyrus of cerebral cortex were investigated.
Results
TrkC protein levels at both the site of injury (T10-T11) and the neighboring segments (T9 and T12) in the spinal cord decreased significantly at 1-7 dpo, followed by a rapid increase at 14 dpo. The temporal changes in TrkC mRNA expression level showed a similar pattern with that of TrkC protein. In addition, the levels of TrkC protein and mRNA at the site of injury (T10-T11) were significantly higher than those at the neighboring spinal segments (T9 and T12). Besides, the levels of TrkC protein and mRNA were higher at the rostral segment than at the caudal segment. However, in the motor cortex, TrkC protein was not detected and TrkC mRNA was expressed at a very low level.
Conclusion
These Results suggest that TrkC may be involved in neuroplasticity after SCI.

Keywords

tyrosine kinase receptor C; spinal cord injury; plasticity; mRNA

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