构建线粒体钙离子摄入蛋白1慢病毒表达载体及在H9C2细胞中的应用

BACKGROUND: Mitochondrial calcium uptake 1 (MICU1) is one of the important molecules to maintain the mitochondrial calcium homeostasis. The regulation of MICU1 to mitochondrial calcium homeostasis may play an important role in diabetic cardiomyopathy, but the underlying mechanism remains unclear.OBJECTIVE:To construct a lentiviral vector carrying MICU1 gene to transfect H9C2 cells, and then to assess MICU1 level in H9C2 cells thereby establishing a platform for researching the occurrence and development of diabetic cardiomyopathy at a cellular level. METHODS: DNA fragments of MICU1 were amplified by PCR, cleaved with Spe I, EcoR I and cloned into the lentiviral vector pRRLsin.CMV.eGFP to construct pRRLsin.CMV.MICU1-eGFP vector. 293T cells were co-transfected with recombined pCMVDR8.91 and pCMV-VSVG to produce pRRLsin.CMV.MICU1-eGFP lentiviral viruses, and then used to infect H9C2 cells. mRNA and protein expressions of MICU1 in the transfected H9C2 cells were evaluated by real-time PCR and western blot assay. Mitochondrial calcium level in Rhod-2-stained H9C2 cells was tested under confocal microscope.RESULTS AND CONCLUSION: The recombinant inducible lentiviral vector containing MICU1 gene was successfully constructed. 293T could express green fluorescent protein with increased MICU1 level after pRRLsin.CMV.MICU1-eGFP transfection. The mRNA and protein expressions of MICU1 in the infected H9C2 group were obviously up-regulated compared with the other groups. MICU1 could remarkably improve the mitochondrial calcium level under Rhod-2 staining. These results show that pRRLsin.CMV.MICU1-eGFP lentiviral viruses are efficient to transfect H9C2 cells, which will be powered to lay a foundation for the immortalized cell line establishment.中国组织工程研究杂志出版内容重点：组织构建；骨细胞；软骨细胞；细胞培养；成纤维细胞；血管内皮细胞；骨质疏松；组织工程

Construction of lentiviral vector carrying mitochondrial calcium uptake 1 and its use in infected H9C2 cells