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Brain-derived Neurotrophic Factor Promotes Growth of Neurons and Neural Stem Cells Possibly by Triggering the Phosphoinositide 3-Kinase/ AKT/Glycogen Synthase Kinase-3β/β-catenin Pathway

[ Vol. 16 , Issue. 7 ]

Author(s):

Xing-tong Li, Zhang Liang, Tong-tong Wang, Jin-wei Yang, Wei Ma, Shi-kang Deng, Xian-bin Wang, Yun-fei Dai, Jian-hui Guo* and Li-yan Li*   Pages 828 - 836 ( 9 )

Abstract:


Background: Brain-derived neurotrophic factor (BDNF) plays a crucial role in promoting survival and differentiation of neurons and neural stem cells (NSCs), but the downstream regulating mechanisms remain poorly understood.

Objective: We investigated whether BDNF exerts its effect by triggering the phosphoinositide 3-kinase (PI3K), protein kinase B, PKB (AKT), glycogen synthase kinase-3β (GSK-3β) and β-catenin signaling pathway in cultured neurons and NSCs derived from the rat embryonic spinal cord.

Method: Immunocytochemistry was used to detect neuronal and NSCs characteristics. RT-PCR was used to detect PI3K/AKT/GSK3β/β-catenin pathway expression.

Results: Neurons and NSCs were successfully separated and cultured from Sprague-Dawley rat embryonic spinal cord and were respectively labeled using immunocytochemistry. Neuron-specific nuclear protein, neuronal class III β-tubulin, and neurofilament expression were detected in neurons; nestin, glial fibrillary acidic protein, microtubule-associated protein 2 and chondroitin sulfate glycosaminoglycan expression were detected in the NSCs. BDNF promoted significant neuronal growth (number, soma size, and average neurite length), as well as NSCs proliferation and differentiation, but BDNF antibody decreased neuronal growth and NSCs proliferation and differentiation. RT-PCR was used to detect changes in BDNF signal pathway components, showing that BDNF upregulated tropomyosin receptor kinase B, phosphoinositide 3-kinase (PI3K), AKT and β-catenin, but downregulated GSK-3β in the neurons and NSCs. BDNF antibody downregulated BDNF, tropomyosin receptor kinase B, PI3K, AKT, β-catenin and cellular-myelocytomatosis viral oncogene, but upregulated GSK- 3β, in the neurons and NSCs.

Conclusion: Our findings suggested that BDNF contributed to neuronal growth and proliferation and differentiation of NSCs in vitro by stimulating PI3K/AKT/GSK3β/β-catenin pathways.

Keywords:

Brain-derived neurotrophic factor, β-catenin, glycogen synthase kinase-3β, neural stem cells, neurons, phosphoinositide 3-kinase, protein kinase B, PKB.

Affiliation:

Institute of Neuroscience, Kunming Medical University, Kunming, Yunnan 650500, Institute of Neuroscience, Kunming Medical University, Kunming, Yunnan 650500, Institute of Neuroscience, Kunming Medical University, Kunming, Yunnan 650500, Institute of Neuroscience, Kunming Medical University, Kunming, Yunnan 650500, Institute of Neuroscience, Kunming Medical University, Kunming, Yunnan 650500, Institute of Neuroscience, Kunming Medical University, Kunming, Yunnan 650500, Institute of Neuroscience, Kunming Medical University, Kunming, Yunnan 650500, Institute of Neuroscience, Kunming Medical University, Kunming, Yunnan 650500, Second Department of General Surgery, First People's Hospital of Yunnan Province, Kunming, Yunnan, Institute of Neuroscience, Kunming Medical University, Kunming, Yunnan

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