Abstract OBJECTIVE: To construct a recombination retroviral expression vector pLNC-IL-4RA with high efficiency transfection and carrying a screening label. METHODS: IL-4RA was inserted into retroviral vector pLNC-Laz to get recombination retroviral expression vector pLNC-IL-4RA and then transfected into packaging cell line PA317 by liposome transfection. The transfected PA317 cells were obtained and amplified by G418 pressure screening. The cell culture supernatants containing viruses were harvested and the viral titer was determined by NIH3T3 cells infection. RESULTS: The G418 resistant clones were titrated and checked for the presence of replication virus. The results showed that the highest titer of viral supernatant was 1×104 CFU/mL. Genome DNA isolated from the cell clone of the highest titer showed the function gene, IL-4RA cDNA, had integrated into the genome of host cells verified by PCR. CONCLUSIONS: The recombination retroviral vector pLNC-IL-4RA encoding IL-4RA after packaging PA317 cells have higher viral titer. This provides a basis for gene treatment of asthma.［Chin J Contemp Pediatr, 2009, 11 (9):761-764］
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