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Related Experiment Videos

Early changes in mouse urinary bladder function following fractionated X irradiation.

W Dörr1, S Schultz-Hector

  • 1GSF-Institut für Strahlenbiologie, Universität München, Germany.

Radiation Research
|July 1, 1992
PubMed
Summary

Radiation therapy causes temporary urinary bladder dysfunction in mice, with fractionated doses offering a protective effect. This study quantifies bladder volume changes and explores radiobiological models for radiation effects.

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Area of Science:

  • Radiation oncology
  • Urology
  • Radiobiology

Background:

  • Radiation therapy can cause functional changes in the urinary bladder.
  • Understanding these changes is crucial for optimizing treatment and minimizing side effects.

Purpose of the Study:

  • To assess functional changes in mouse urinary bladders after single-dose or fractionated irradiation.
  • To quantify the sparing effect of fractionated radiation doses on bladder function.

Main Methods:

  • Cystometry was used to measure the intravesical volume-pressure relationship during transurethral filling.
  • A quantal dose response was defined as a 50% reduction in bladder volume (V10 or V20).
  • The linear-quadratic model was applied to analyze dose-response data.

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Main Results:

  • A dose-dependent, temporary decrease in bladder reservoir function (V10, V20) was observed, occurring 7-25 days post-irradiation.
  • Fractionated irradiation showed a significant sparing effect, with ED50 values increasing with more fractions.
  • Estimated alpha/beta ratios (11.1-13.9 Gy) indicate fractionation effects typical of acutely responding tissues.

Conclusions:

  • Fractionated radiation therapy significantly spares mouse urinary bladder function compared to single doses.
  • The observed effects are consistent with acute radiation responses, despite a lack of significant urothelial cell depletion.