Damage to Mouse Bladder from Photodynamic Therapy
Author Information
Author(s): F.A. Stewart, Y. Oussoren, J.A.M. te Poele, S. Horenblas, W.J. Mooi
Primary Institution: The Netherlands Cancer Institute
Hypothesis
What is the extent of functional and histological damage to the mouse bladder after photodynamic therapy?
Conclusion
Photodynamic therapy causes temporary functional damage to the bladder, with recovery occurring within 6 to 10 weeks depending on the light dose.
Supporting Evidence
- Functional bladder damage was assessed from increases in urination frequency and the presence of haematuria.
- Complete functional recovery was observed by 6 to 10 weeks after doses of up to 7.5 J cm-2.
- Histological damage included epithelial sloughing and submucosal oedema.
- Up to 50% of mice still had increased urination frequency at 10 weeks after doses greater than 11.25 J cm-2.
Takeaway
This study looked at how a special light treatment affects mouse bladders, showing that while it can cause problems, the bladders usually heal well after a few weeks.
Methodology
Mice were treated with a photosensitiser and then illuminated with laser light, with assessments of bladder function and histology conducted over 6 months.
Potential Biases
Potential bias in the assessment of functional damage due to subjective measures of urination frequency.
Limitations
The study was conducted on mice, which may not fully represent human responses to photodynamic therapy.
Participant Demographics
Female C3H/Hen Af-nu+ mice, aged 12 to 16 weeks.
Statistical Information
P-Value
p<0.04
Statistical Significance
p<0.05
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