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Related Experiment Videos

Histological changes in mouse colon after single- and split-dose irradiation

D S Followill1, D Kester, E L Travis

  • 1Department of Physics, University of Texas M. D. Anderson Cancer Center, Houston 77030.

Radiation Research
|November 1, 1993
PubMed
Summary

Radiation exposure can cause two types of colorectal obstructions in mice: early, ulceration-driven blockages and late, fibrosis-driven strictures. The type of obstruction depends on the radiation dose and the colon

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Area of Science:

  • Radiation oncology
  • Gastroenterology
  • Pathology

Background:

  • Radiation therapy can cause acute mucosal damage and late complications in the colorectal region.
  • Understanding the relationship between acute damage and late obstructions is crucial for managing radiation side effects.

Purpose of the Study:

  • To investigate the relationship between acute mucosal damage and the development of late colorectal obstructions in mice following radiation exposure.
  • To differentiate between types of late bowel obstructions based on radiation dose and histological findings.

Main Methods:

  • Male C3Hf/Kam mice were exposed to single or split doses of radiation (15-35 Gy) targeting the distal colon and rectum.
  • Obstruction onset, incidence, and histological changes were recorded over time.

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  • Acute mucosal damage and regeneration were assessed through sequential histological studies.

    • Main Results:

    • Doses >20 Gy caused acute crypt depletion, failed regeneration, and early obstructions (by 4 weeks) with mucosal ulceration.
    • Doses <20 Gy or split doses led to successful regeneration and later obstructions (by 40 weeks) with intact mucosa and submucosal fibrosis.
    • A single dose of 20 Gy produced both types of obstructions depending on the timing post-irradiation.

    Conclusions:

    • Two distinct types of late colorectal obstructions emerge after radiation: 'consequential' (epithelial denudation-dependent) and 'true late effect' (epithelial denudation-independent).
    • Histological characterization of obstructions (ulceration vs. fibrosis) is key to differentiating these radiation-induced responses.