Abstract
Adenovirus‐mediated wild‐type p53 gene transfer induces apoptosis in a variety of human cancer cells. Although clinical trials have demonstrated that a replication‐deficient recombinant adenovirus expressing the wild‐type p53 gene (Ad‐p53) is effective in suppressing growth of non‐small cell lung cancer (NSCLC), we often experienced late resistance to this treatment. To elucidate the mechanism of late resistance to Ad‐p53 in human lung cancer cells, we generated 5 different resistant variants from p53‐susceptible H1299 NSCLC cells by repeated infections with Ad‐p53. We first examined the transduction efficiency of adenoviral vector by Ad‐LacZ transduction followed by X‐gal staining in parental and 5 resistant H1299 cell lines. Their sensitivity to viral infection decreased in correlation with the magnitude of resistance, and Ad‐p53‐mediated tumor suppression could be restored by dose escalation of Ad‐p53 in the resistant variants. The expression of Coxsackie and adenovirus receptor (CAR) and αV integrins, which are cellular receptors for attachment and internalization of the virus, respectively, was next investigated in these cell lines. Flow cytometry revealed that αVβ3 and αVβ5 integrin expression was consistent, while p53‐resistant cell lines showed that diminished CAR expression correlated with the magnitude of the resistance. Our results demonstrated that decreased CAR expression could be one of the mechanisms of late resistance to Ad‐p53, which may have a significant impact on the outcome of adenovirus‐based cancer gene therapy.
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