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Related Experiment Videos

Polyclonal origin of mouse skin papillomas.

D J Winton1, M A Blount, B A Ponder

  • 1Institute of Cancer Research, Haddow Laboratories, Sutton, Surrey, UK.

British Journal of Cancer
|July 1, 1989
PubMed
Summary

Mouse skin papillomas are polyclonal from early development stages. This suggests multi-clone cell interaction, not just single-cell initiation and promotion, is crucial for tumor origin.

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Area of Science:

  • Developmental biology
  • Oncology
  • Carcinogenesis

Background:

  • Chemical initiation-promotion regimes are used to induce skin papillomas in mice.
  • Previous studies on tumor origins have yielded conflicting conclusions regarding clonality.
  • Understanding the cellular origins of tumors is critical for cancer research.

Purpose of the Study:

  • To investigate the clonal origin of chemically induced mouse skin papillomas.
  • To determine if papillomas arise from a single initiated cell or multiple clones.
  • To clarify the role of cell interaction in tumor development.

Main Methods:

  • Induction of mouse skin papillomas using a chemical initiation-promotion regime.
  • Analysis of tumor cell populations using embryo aggregation chimeras.
  • Immunohistochemical staining to visualize mosaic cell populations within tumors.

Main Results:

  • Mouse skin papillomas, even at early developmental stages, exhibit polyclonal characteristics.
  • Direct demonstration of polyclonality was achieved through immunohistochemical analysis of chimeras.
  • This method overcomes limitations of previous analyses based on electrophoretic polymorphisms.

Conclusions:

  • Chemically induced mouse skin papillomas are polyclonal from their earliest recognizable stages.
  • The findings challenge the hypothesis that single-cell initiation followed by clonal promotion is sufficient for tumor formation.
  • Tumorigenesis likely involves interactions between cells from multiple distinct clones.

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