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Histologic findings after gastrocystoplasty in rabbits
Peter Vajda1, Andrew B Pinter, Tamas Magyarlaki
1Department of Pediatrics, University of Pecs, H-7623 Pecs, Hungary. peter.vajda@aok.pte.hu
Purpose:
The aim of this study was to investigate the long-term histologic changes after bladder augmentation with gastric segment in an animal subject.
Materials And Methods:
Gastrocystoplasty was performed in 13 young, 3-month-old male rabbits. Open biopsies were taken from the native bladder and the gastric segment preoperatively and at 3, 6, and 12 months postoperatively. Sections were examined with H&E and periodic acid-Schiff (PAS) staining. Indirect immune peroxidase method was additionally applied to detect the carcinoembrionic antigen, the proliferative activity, and the gene for the tumor protein p53 in the epithelium.
Results:
On the native bladder, at the 3-month follow-up, polyps, mucosal edema, submucosal fibrosis, and squamous cell metaplasia were detected, which did not change during the follow-up. On the gastric segment, at the 3-month follow-up, parietal cell hyperplasia and inflammatory mucosal overgrowth were detected; at the 6-month follow-up, inflammation or atrophy of the gastric mucosa and colonic-type metaplasia was found. These alterations remained unchanged during later course of follow-up. Neither dysplasia nor malignancy was observed during the 12-month follow-up.
Conclusions:
The present study supports the clinical observations of low cancer risk after gastrocystoplasty and may indicate different effect of gastric secretion on uroepithelium and that of urine on gastric mucosa.
