Overexpression of microRNA-221 promotes the differentiation of stem cells from human exfoliated deciduous teeth to neurons through activation of Wnt/β-catenin pathway via inhibition of CHD8.
microRNAs have been proved to function in some processes of differentiation and the effect is favorable. At present, the differentiation of stem cells is not so ideal because of the high expenses and inaccessibility. Therefore, we explored the possibility that microRNA-221 (miR-221) affects differentiation from stem cells from human deciduous tooth (SHEDs) to neurons through Wnt/β-catenin pathway via binding to CHD8. After collection of SHEDs, differentiation from SHEDs to neurons was conducted by neurotrophic factor induction method in vitro, followed by gain- and loss-of-function experiments. Expression of neuron-related genes in SHEDs was examined by immunohistochemistry. The relationship between CHD8 and miR-221 was detected by dual luciferase reporter gene assay. RT-qPCR and Western blot analysis were used to determine miR-221 expression, and the mRNA and protein expression of CHD8, Wnt/β-catenin pathway- and neuron-related genes. Cell viability, and cell cycle and apoptosis were investigated by MTT assay and flow cytometry respectively. Dual luciferase reporter assay displayed that miR-221 targeted CHD8 and then affected the differentiation progression. Results of RT-qPCR and Western blot analysis showed that expression of Wnt/β-catenin pathway-related genes increased significantly, CHD8 expression decreased in neuron-induced SHEDs after miR-221 overexpression or CHD8 silencing. In response to miR-221 overexpression and CHD8 silencing, cell viability and cell cycle entry were increased, and apoptosis was reduced. Moreover, overexpression of miR-221 or silencing of CHD8 elevated the expression of neuron-related genes in neuron-induced SHEDs. Taken together, upregulation of miR-221 promotes differentiation from SHEDs to neuron cells through activation of Wnt/β-catenin pathway by binding to CHD8.
['Wen|Bing|B|', 'He|Chenjiang|C|', 'Zhang|Qin|Q|', 'Zhang|Fanglin|F|', 'Li|Na|N|', 'Pan|Yan|Y|', 'Deng|Mengting|M|', 'Wang|Yue|Y|', 'Li|Jianping|J|', 'Qiu|Jiaxuan|J|']
D002454:Cell Differentiation D002478:Cells, Cultured D002648:Child D004268:DNA-Binding Proteins D005260:Female D015870:Gene Expression D006801:Humans D008297:Male D035683:MicroRNAs D009474:Neurons D013234:Stem Cells D014080:Tooth Exfoliation D014094:Tooth, Deciduous D014157:Transcription Factors D060449:Wnt Signaling Pathway
microRNA-221 differentiation stem cells from human exfoliated deciduous teeth neurons Wnt/β-catenin pathway CHD8