title: Construction of retroviral vectors to induce a strong expression of human class interferon gene in human hepatocellular carcinoma cells in vitro.
abstract: OBJECTIVE
  To establish the hepatoma cell-specific expression of human interferon (IFN) gene mediated by retroviral vectors
  
  
  METHODS
  Human interferon α and interferon β complementary DNA (IFN cDNA) were cloned into the polylinker site of pMNSM retroviral vector to construct recombinant retroviral vectors pMNSIFNA and pMNSIFNB, with the transcription of IFN gene being driven by Simian virus 40 early region promoter (SV40) early region promoter. IFN cDNAs were also cloned into pMNAIFNA, pAMNSIFNA, and pMNAIFNB, with the transcription of IFN gene being driven by SV40 early region promoter regulated by α-fetoprotein enhancer. Next, the retroviral constructs were introduced into retroviral amphotropic packaging cells using the lipofectamine-mediated gene transfer procedure. The rate of plasmid transfection was (4-40) × 10(3) colonies/μg DNA/10(6) PA317 cells. The rate of retrovirus infection was (5-500) × 10(4) colony forming units (CFU)/mL. Further, the recombinant retroviruses were used to infect human hepatoma cells, renal carcinoma cells, and melanoma cell lines in the presence of 4 μmg/L polybrene.
  
  
  RESULTS
  Northern and Dot hybridization of total RNA from the neomycin-resistant colonies and IFN expression assay indicated that human α fetoprotein enhancer induced efficient and specific transcription and expression of IFN genes driven by the promoter of different origins in human hepatoma cells, leading to high production of α fetoprotein.
  
  
  CONCLUSIONS
  Cis active element of α-fetoprotein gene can drive specific expression of IFN genes in human hepatoma cells, which provides some valuable data for the hepatoma-specific immune gene therapy.
authors.affiliation: Guang-Wen Cao, Jun-Gao, Ping Du, Zhong-Tian Qi, Department of Microbiology, Second Military Medical University, Shanghai 200433, China.
authors.forename: G W
authors.initials: GW
authors.lastname: Cao
authors.affiliation: Guang-Wen Cao, Jun-Gao, Ping Du, Zhong-Tian Qi, Department of Microbiology, Second Military Medical University, Shanghai 200433, China.
authors.lastname: Jun-Gao
authors.affiliation: Guang-Wen Cao, Jun-Gao, Ping Du, Zhong-Tian Qi, Department of Microbiology, Second Military Medical University, Shanghai 200433, China.
authors.forename: P
authors.initials: P
authors.lastname: Du
authors.affiliation: Guang-Wen Cao, Jun-Gao, Ping Du, Zhong-Tian Qi, Department of Microbiology, Second Military Medical University, Shanghai 200433, China.
authors.forename: Z T
authors.initials: ZT
authors.lastname: Qi
authors.affiliation: Guang-Wen Cao, Jun-Gao, Ping Du, Zhong-Tian Qi, Department of Microbiology, Second Military Medical University, Shanghai 200433, China.
authors.forename: X T
authors.initials: XT
authors.lastname: Kong
keywords: Carcinoma, hepatocellular; Gene expression; Gene therapy; Genes, regulatory; Interferon alpha; Interferon beta; Liver neoplasms; Retroviridae