1. Human Papillomavirus E6 Knockdown Restores Adenovirus Mediated-estrogen Response Element Linked p53 Gene Transfer in HeLa Cells
- Author
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Toshiyuki Sumi, Ken-ichi Honda, Hiroyuki Terada, Osamu Ishiko, Koji Kajitani, Masayasu Koyama, and Tomoyo Yasui
- Subjects
0301 basic medicine ,Cancer Research ,Epidemiology ,Blotting, Western ,Uterine Cervical Neoplasms ,Estrogen receptor ,Real-Time Polymerase Chain Reaction ,Response Elements ,Adenoviridae ,HeLa ,03 medical and health sciences ,Transduction (genetics) ,0302 clinical medicine ,Humans ,RNA, Messenger ,RNA, Small Interfering ,Gene ,Hormone response element ,Messenger RNA ,Gene knockdown ,biology ,Reverse Transcriptase Polymerase Chain Reaction ,Public Health, Environmental and Occupational Health ,Estrogens ,Genetic Therapy ,Oncogene Proteins, Viral ,Flow Cytometry ,biology.organism_classification ,Molecular biology ,DNA-Binding Proteins ,Blot ,030104 developmental biology ,Oncology ,030220 oncology & carcinogenesis ,Cancer research ,Female ,Tumor Suppressor Protein p53 ,hormones, hormone substitutes, and hormone antagonists ,HeLa Cells - Abstract
The p53 gene is inactivated by the human papillomavirus (HPV) E6 protein in the majority of cervical cancers. Treatment of HeLa S3 cells with siRNA for HPV E6 permitted adenovirus-mediated transduction of a p53 gene linked to an upstream estrogen response element (ERE). Our previous study in non-siRNA treated HHUA cells, which are derived from an endometrial cancer and express estrogen receptor β, showed enhancing effects of an upstream ERE on adenovirus-mediated p53 gene transduction. In HeLa S3 cells treated with siRNA for HPV E6, adenovirus-mediated transduction was enhanced by an upstream ERE linked to a p53 gene carrying a proline variant at codon 72, but not for a p53 gene with arginine variant at codon 72. Expression levels of p53 mRNA and Coxsackie/adenovirus receptor (CAR) mRNA after adenovirus-mediated transfer of an ERE-linked p53 gene (proline variant at codon 72) were higher compared with those after non-ERE-linked p53 gene transfer in siRNA-treated HeLa S3 cells. Western blot analysis showed lower β-tubulin levels and comparatively higher p53/β-tubulin or CAR /β-tubulin ratios in siRNA-treated HeLa S3 cells after adenovirus-mediated ERE-linked p53 gene (proline variant at codon 72) transfer compared with those in non-siRNA-treated cells. Apoptosis, as measured by annexin V binding, was higher after adenovirus-mediated ERE-linked p53 gene (proline variant at codon 72) transfer compared with that after non-ERE-linked p53 gene transfer in siRNA-treated cells.
- Published
- 2016
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