Neural stem cells over-expressing brain-derived neurotrophic factor promote neuronal survival and cytoskeletal protein expression in traumatic brain injury sites |
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Authors: | Tao Chen Yan Yu Liu-jiu Tang Li Kong Cheng-hong Zhang Hai-ying Chu Liang-wei Yin Hai-ying Ma |
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Affiliation: | 1. Department of Neurosurgery,the First Affiliated Hospital of Dalian Medical University,Dalian,Liaoning Province,China;2. Department of Histology and Embryology,Dalian Medical University,Dalian,Liaoning Province,China 3 Department of Oncology,Dalian Central Hospital,Dalian,Liaoning Province,China;3. Department of Oncology,Dalian Central Hospital,Dalian,Liaoning Province,China |
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Abstract: | Cytoskeletal proteins are involved in neuronal survival. Brain-derived neurotrophic factor can increase expression of cytoskeletal proteins during regeneration after axonal injury. However, the effect of neural stem cells genetically modified by brain-derived neurotrophic factor transplantation on neuronal survival in the injury site still remains unclear. To examine this, we established a rat model of traumatic brain injury by controlled cortical impact. At 72 hours after injury, 2 × 107 cells/mL neural stem cells overexpressing brain-derived neurotrophic factor or naive neural stem cells (3 mL) were injected into the injured cortex. At 1–3 weeks after transplantation, expression of neurofil-ament 200, microtubule-associated protein 2, actin, calmodulin, and beta-catenin were remarkably increased in the injury sites. These findings confirm that brain-derived neurotrophic factor-transfected neural stem cells contribute to neuronal survival, growth, and differ-entiation in the injury sites. The underlying mechanisms may be associated with increased expression of cytoskeletal proteins and the Wnt/β-catenin signaling pathway. |
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Keywords: | nerve regeneration brain-derived neurotrophic factor neural stem cells transfect differentiation traumatic brain injury cytoskeleton neurofilament microtubule-associated proteins calmodulin Wnt/β-catenin neural regeneration |
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