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Journal of Neurorestoratology  2017, Vol. 5 Issue (1): 143-153    doi: 10.2147/JN.S134363
Original Research     
Effects of IGFBP-2 on proliferation and differentiation in neural stem cell line C17.2
Yujia Deng1, Lei Wang1,2, Lite Ge1,3, Da Duan1, Yi Zhuo1, Ting Yuan1, Weiping Yan1, Peiqi Huang1, Xiaohua Teng1, Ming Lu1,3
1 Department of Neurosurgery, The Second Affiliated Hospital of Hunan Normal University (163 Hospital of the People’s Liberation Army), Changsha;
2 Department of Neurosurgery, Affiliated Haikou Hospital, Xiangya School of Central South University, Haikou;
3 Key Laboratory of Protein Chemistry and Developmental Biology of Ministry of Education, College of Life Sciences, Hunan Normal University, Changsha, People’s Republic of China
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Abstract  Objective: Insulin-like growth factor binding protein-2 (IGFBP-2), a member of a highly conserved family of six insulin-like growth factor binding proteins (IGFBPs), can regulate several cellular processes through IGF-dependent or IGF-independent pathway. Recent studies have provided solid evidence for the importance to delineate that olfactory ensheathing cells (OEC)-conditioned medium (OCM) can not only facilitate the differentiation of neural stem cell line (C17.2) into neurons, but also promote the survival and proliferation. We have previously reported that IGFBP-2 was detected in OCM. This study is designed to investigate the roles of IGFBP-2 for the regulation of C17.2 differentiation and proliferation. Methodsand results: IGFBP-2 was identified and upregulated in OCM to compare with astrocytes-conditioned medium by shotgun proteomics and semiquantitative proteomic analysis. In order to investigate whether exogenous IGFBP-2 could stimulate proliferation in C17.2 cells and differentiate it into glia or neuron, we used various concentrations of IGFBP-2 to induce C17.2 cells which were cultured in DMEM/F12. The results showed that exogenous IGFBP-2 can promote proliferation in C17.2 cells, but had little effect on differentiation. Interestingly, we also found that IGFBP-2 could induce C17.2 cells to differentiate into astrocytes, while inhibiting their differentiation into neurons in a dose-dependent manner when cultured C17.2 cells in OCM. Changes in cell morphology were imaged under a light microscope, and proliferating cells were counted. Cell viability was determined by MTT. In addition, Western blot, immunofluorescence, and flow cytometry analysis were performed to detect protein expression patterns of proliferation-related antigen, proliferating cell nuclear antigen, neuroectodermal stem cell marker, neuron specific class III beta tubulin, and glial fibrillary acidic protein. Conclusion: Exogenous IGFBP-2 could stimulate proliferation in C17.2 cells, and promote the differentiation of C17.2 cells into astrocytes induced by OCM. Its mechanism is related to activation of the extracellular signal-regulated kinase 1/2 pathway.

Key wordsIGFBP-2      C17.2 cells      proliferation      differentiation     
Received: 10 February 2017      Published: 26 December 2017
Corresponding Authors: Xiaohua Teng; Ming Lu, Department of Neurosurgery, The Second Affiliated Hospital of Hunan Normal University, (163 Hospital of the People’s Liberation Army), HongShan Bridge No.1, KaiFu District, Changsha 410003, People’s Republic of China Email;   
Cite this article:

Yujia Deng, Lei Wang, Lite Ge, Da Duan, Yi Zhuo, Ting Yuan, Weiping Yan, Peiqi Huang, Xiaohua Teng, Ming Lu. Effects of IGFBP-2 on proliferation and differentiation in neural stem cell line C17.2. Journal of Neurorestoratology, 2017, 5: 143-153.

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