2.4. Viruses, cells, cloning, and expression of neuraminidase A full length cDNA encoding the neuraminidase of novel H1N1 influenza (A/California/08/2009(H1N1)) and oseltamivir-resistant neuraminidase (H274Y mutant) were constructed as previously reported method (Dao et al., 2010). The influenza strains A/Chicken/ Korea/O1310/2001 (H9N2) and A/Sw/Kor/CAH1/04 (H1N1, KCTC 11165BP) were used in this study. 293T cells (human embryonic kidney cells) was maintained in Dulbecco’s Modified Eagle’s Medium (DMEM) (Welgene) supplemented with 10% fetal bovine serum at 37 C and 5% CO2. The 293T cells were counted and plated in 6-well plates at a density of 105 cells/well. After 24 h, the cells were transfected with the plasmids containing the cDNAs using a commercial transfection kit (Welfect EX-plus, Welgene, Daegu, Korea), according to the manufacturer’s instructions.
2.4. Viruses, cells, cloning, and expression of neuraminidase A full length cDNA encoding the neuraminidase of novel H1N1 influenza (A/California/08/2009(H1N1)) and oseltamivir-resistant neuraminidase (H274Y mutant) were constructed as previously reported method (Dao et al., 2010). The influenza strains A/Chicken/ Korea/O1310/2001 (H9N2) and A/Sw/Kor/CAH1/04 (H1N1, KCTC 11165BP) were used in this study. 293T cells (human embryonic kidney cells) was maintained in Dulbecco’s Modified Eagle’s Medium (DMEM) (Welgene) supplemented with 10% fetal bovine serum at 37 C and 5% CO2. The 293T cells were counted and plated in 6-well plates at a density of 105 cells/well. After 24 h, the cells were transfected with the plasmids containing the cDNAs using a commercial transfection kit (Welfect EX-plus, Welgene, Daegu, Korea), according to the manufacturer’s instructions.
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