Protective effect of O^6-methylguanine-DNA-methyltransferase on mammalian cells

• Published in: Chinese medical journal Vol. 120; no. 8; pp. 714 - 717
• Main Author: LI Dong-bo WANG Ji-shi FANG Qin SUN Hai-yang XU Wei LI Wei-da
• Format: Journal Article
• Language: English
• Published: 20.04.2007
• Subjects: O^6-甲基鸟嘌呤-DNA-甲基转移酶; 保护作用; 哺乳动物; 基因疗法
• ISSN: 0366-6999; 2542-5641
• DOI: 10.1097/00029330-200704020-00019

Background O^6-methylguanine-DNA-methyltransferase （MGMT） is a specific DNA revising enzyme transferring alkylated groups from DNA to its cysteine residue to avoid the abnormal twisting of DNA. Therefore, it is one of the drug resistant genes targeted in the treatment of cancer. This study explored the protective effect of MGMT gene transferred into mammalian cells. Methods Mammalian expression vector containing the MGMT gene cloned from human hepatocytes by RT-PCR was constructed and transferred into K562 cells and human peripheral blood mononuclear cells （PBMCs） via liposome, then assayed for gene expression at RNA and protein levels. MIF assay was used to check the drug resistance of cells transfected with MGMT gene. Results MGMT gene was successfully cloned. Real-time PCR showed that the mRNA expression in gene transfected groups in K562 cell line and PBMC were 13.4 and 4.0 times that of the empty vector transfected groups respectively. Results of Western blotting showed distinct higher expression of MGMT in gene transfected group than in other two groups. The IC50 values increased to 7 and 2 times that of the original values respectively in stable transfected K562 cells and transient transfected PBMC. Conclusion The alkylating resistance of eukaryotic cells is enhanced after being transfected with MGMT gene which protein product performs the protective function, and may provide the reference for the protective model of peripheral blood cells in cancer chemotherapy.