CONSTRUCTION AND EXPRESSION OF THE REPLICATION DEFICIENT ADENONIRUS VECTOR OF HUMAN GM CSF

The full-length cDNA encoding human Granulocyte macrophage colony stimulating factor (GM CSF) was cloned by RT PCR, placed under the control of CMV promoter, and inserted into adenovirus vector of E1 substitution type, pAx1cw. Subsequently, the cassette cosmid was cotransfected into 293 cells together with EcoT22I digested Ad5 TPC, and the replication deficient recombinant adenoviruses(Ad) of human GM CSF were generated efficiently by homologous recombination, with the titers of 1.51×10 9pfu/ml. 48 hours after infection with prepared human GM CSF recombinant adenoviruses in vitro, HeLa cells and primary human skin fibroblasts expressed high levels of human GM CSF (80～400ng/ 10 6cells/24hr). These suggest that the recombinant Ad of human GM CSF prepared by COS/TPC method is effective in mediating GM CSF gene transfer and might be used in cancer gene therapy.