Construction and Expression of Human PTEN Tumor Suppressor Gene Recombinant Adenovirus Vector

Phosphatase and tensin homologue deleted onchromosome10(PTEN)is a newtumor suppres-sor gene and possesses mutation in multiple kindsof tumors which include breast cancer1].Teng2]found the incidence for loss of heterozygosity(LOH)in breast cancer speci mens was48%(32/67),and the mutation and inactivation of PTENgene plays a central role in cell migration,growthandinvasion of breast cancer3].This study ai ms atestablishing a kind of proliferative defective recom-binant adenovirus vector A…

Construction and expression of human PTEN tumor suppressor gene recombinant adenovirus vector

Summary The recombinant defective adenovirus vector carrying human PTEN tumor suppressor gene was constructed by using AdEasy-1 system and its expression was detected in human breast cancer cell line MDA-MB-468. Human PTEN cDNA was cloned into adenovirus shuttle plasmid pAdTrack-CMV to generate a recombinant plasmid pAdTrack-CMV-PTEN, then homologeous recombination was carried out in the E. coli BJ5183 by contransforming linearized shuttle vector with adenovirus backbone plasmid pAdEasy-1. The newly recombined defective adenovirus vector Ad-PTEN containing green fluorescent protein (GFP) was packaged and propagated in 293 cells. After being purified by cesium chloride gradient centrifugation, the adenovirus was transfected into human breast cancer cell line MDA-MB-468 in vitro. The expression of PTEN mRNA and protein in infected human breast cancer cell line MDA-MB-468 was detected by RT-PCR and Western blot respectively. The recombinant defective adenovirus vector carrying PTEN gene was constructed successfully. The viral titer of purified adenovirus was 2.5×10¹⁰ pfu/mL, and about 70% breast cancer cells were infected with Ad-PTEN when multiplicity of infection (MOI) reached 50. The exogenous PTEN mRNA and protein were expressed in MDA-MB-468 cells infected with Ad-PTEN by RT-PCR and Western blot. The recombinant defective adenovirus vector of PTEN gene was constructed successfully using AdEasy-1 system rapidly, which paved a sound foundation for gene study of breast cancer. CHEN Qingyong, male, born in 1968, M. D., Ph. D.