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© 1995 Oxford University Press

research-article

Frequent mutations of the p53 gene and infrequent H- and K-ras mutations in urinary bladder carcinomas of NON/Shi mice treated with N-butyl-N-(4-hydroxybutyl)nitrosamine

Shinji Yamamoto 1 2, Tsuneo Masui 1, Takashi Murai 2 3, Satoru Mori 2 3, Tadao Oohara 3, Susumu Makino 3, Shoji Fukushima 2 and Masae Tatematsu 1

1Laboratory of Pathology, Aichi Cancer Center Research Institute Kanokoden, Chikusa-ku, Nagoya 4-64
2First Department of Pathology, Osaka City University Medical School Asahi-machi, Abeno-ku, Osaka 545
3Aburahi Laboratories, Shionogi Research Laboratories, Shionogi Co. Ltd Koka-cho, Koka-gun, Shiga 520-34, Japan

To elucidate whether common genetic events in human urinary bladder carcinogenesis also occur in rodent models, we investigated the presence of p53, H- and K-ras mutations in 18 urinary bladder carcinomas induced by various concentrations of N-butyl-N-(4-hydroxybutyl)nitrosamine (BBN) in male NON/Shi mice. Histopathologically, all were invasive, 11 being squamous cell carcinomas (SCCs) and the remaining seven being transitional cell carcinomas (TCCs). Using polymerase chain reaction single-strand conformation polymorphism (PCR-SSCP) analysis followed by DNA sequencing, p53, H- and K-ras mutations were observed in 14 (78%; exons 5–7), two (11%; one each on exons 1 and 2) and one (5.6%; exon 1) animals respectively. The frequencies of mutations in p53 exons 5, 6 and 7 were 7 (39%), 4 (22%), and 9 (50%) respectively, and no mutation was found in exon 8. All mutations involved one base-pair substitution with or without amino acid changes and the types of base-pair substitution were random. No evident association was observed between mutation sites and the histological phenotypes. In conclusion, p53 mutations are frequent in BBN-induced mouse invasive urinary bladder tumors, at similar levels to those observed for human high-grade invasive carcinomas, and this plus their distribution suggests their possible participation in this model of urinary bladder carcinogenesis.


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