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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
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Related Experiment Video

Updated: Jul 22, 2026

An Orthotopic Bladder Cancer Model for Gene Delivery Studies
07:48

An Orthotopic Bladder Cancer Model for Gene Delivery Studies

Published on: December 2, 2013

p16 gene overexpression in mouse bladder carcinomas

M Asamoto1, T Hori, H Baba-Toriyama

  • 1Chemotherapy Division, National Cancer Center Research Institute, Tokyo, Japan.

Cancer Letters
|June 10, 1998
PubMed
Summary

This study found that while gene deletion is not involved in mouse bladder cancer, abnormalities in p16 gene expression may play a role. Further research into p16 gene expression in bladder carcinomas is warranted.

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Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • Deletion at 9p21 is common in human bladder carcinomas.
  • The p16 gene, a potential tumor suppressor, is located in the 9p21 region.
  • Investigating p16 gene alterations in mouse bladder cancer models is crucial.

Purpose of the Study:

  • To investigate loss of heterozygosity (LOH) and expression of the p16 gene in mouse bladder carcinomas.
  • To assess the impact of normal cell contamination on LOH analysis using xenografts.
  • To determine the role of p16 gene alterations in mouse bladder carcinogenesis.

Main Methods:

  • Analysis of p16 gene LOH in primary mouse bladder carcinomas and xenografts.
  • Evaluation of p16 gene expression levels in tumor samples.
  • Use of microsatellite polymorphisms to differentiate between mouse strains (B6C3F1 and CD-1(ICR)) and assess contamination effects.

Main Results:

  • No loss of heterozygosity (LOH) at the p16 locus was detected in mouse bladder carcinomas or xenografts.
  • Surprising overexpression of the p16 gene was observed in all primary mouse bladder carcinomas.
  • Careful tumor tissue sampling confirmed negligible effects of normal cell contamination on LOH analysis.

Conclusions:

  • Gene deletion of p16 is not implicated in mouse bladder carcinogenesis.
  • Abnormalities in p16 gene expression are suggested to be involved in mouse bladder cancer development.
  • The findings highlight the importance of p16 expression rather than deletion in this cancer model.