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The mechanism analysis of temperature regulating proliferation of stem cells modified by tsSV40LT gene
2012, 40 (3):
0-214 .
Objective:To study the mechanism of temperature control proliferation of the stem cells modified by tsSV40LT gene for establishing a basement on stem cells transplantation into injured brain area during hypothermia treatment. Methods: After transfecting plasmid containing temperature-sensitive simian virus 40 large T-antigen (tsSV40LT) into umbilical cord mesenchymal stem cells (UCMSCs), PCR method was used to detect gene integration. Then we cultured these UCMSCs modified by tsSV40LT in 33℃ and 37℃ incubators respectively. Immunofluorescence was used to detect proliferating cell nuclear antigen (PCNA) activity, telomerase activation analysis by PCR-ELISA telomerase detect kit, and cell cycle by flow cytometry. Then cell cycle regulating proteins, including Cyclin D1, CyclinE, CDK2, CDK4, CDK6, P16 and P21, were detected by western blot. The expression of nestin, neurone specific enolase (NSE) and glial fibrillary acidic protein(GFAP) were detected by immunofluorescence method. Results:The tsSV40LT gene was integrated into UCMSCs successfully. When cultured at 33℃ incubator, the new cell line displayed high proliferation activity, as well as its telomerase activation, highly expressed Cyclin D1, CyclinE, CDK2, CDK4 and CDK6, and lowly expressed P16 and P21, meanwhile, highly nestin, lowly NSE and GFAP. But when cultured at 37℃ incubator, the cell line showed a completely converse profile. Conclusion:The proliferation of stem cells can be regulated by temperature through effective tsSV40LT gene transfection, and that supports the clinical application of stem cells transplantation into injured brain area during hypothermia treatment.
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