Abstract:
:To investigate the effect of p33(ING1) on wild-type p53 gene therapy, T.Tn human esophageal carcinoma cells were stably transfected with p33(ING1) cDNA. Infection with Ad-p53 (recombinant adenovirus containing wild-type p53) into p33-transfected cells reduced cell viability, while infection with empty vector had little effect. This reduced viability was shown to be due to apoptotic cell death by the TUNEL (terminal deoxynucleotidyl transferase-mediated nick end-labeling) assay. Following infection with Ad-p53, levels of p53 were similar in p33-expressing cells and in the parental line. However, levels of p21 and Mdm2 were elevated in p33-transfected cells. Nonetheless, this enhanced expression of Mdm2 appeared to be ineffective in downregulating p53. Transient transfection with mutant Mdm2 prior to Ad-p53 infection provided a significant protection as compared with cells transfected with wild-type Mdm2. These results imply a synergistic effect between p33 and p53 in the induction of apoptosis of human esophageal carcinoma cells. A role for Mdm2 in this synergism is suggested.
journal_name
Oncogenejournal_title
Oncogeneauthors
Shimada H,Liu TL,Ochiai T,Shimizu T,Haupt Y,Hamada H,Abe T,Oka M,Takiguchi M,Hiwasa Tdoi
10.1038/sj.onc.1205176subject
Has Abstractpub_date
2002-02-14 00:00:00pages
1208-16issue
8eissn
0950-9232issn
1476-5594journal_volume
21pub_type
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