Summary
It was our aim in the present animal experiments to study the influence of stimulation of proliferative activity on carcinogenesis in the urinary bladder. Stimulation of urothelial proliferation was achieved by a one-third resection of the bladder. N-butyl-N-(4-hydroxybutyl)-nitrosamine (BBN), which was used as a carcinogen, was administered by gavage in three fractionated doses when proliferative activity was highest at 30, 45, and 70 h postoperatively. Contrary to our working hypothesis, the incidence of urinary bladder tumors proved to be significantly reduced by partial cystectomy. After administration of a low total dose of BBN (300 mg/kg bodyweight) and an experimental period of 6, 12, and 18 months, only 2.6% of the rats with a partial cystectomy, but 12.6% of the control animals with an intact bladder had developed papillomas and noninvasive papillary transitional cell carcinomas. Following administration of BBN at a higher total dose (1,300 mg/kg bodyweight), bladder tumors occurred after an induction period of 4, 6, and 12 months in 27.4% of the partially cystectomized and 48.1% of the nonoperated rats. Multiple tumors were found more frequently in the controls than in the operated animals. The reduction in the tumor incidence following one-third resection of the bladder evidently does not depend on a prolongation of the latency period or induction time. From findings in analogous experimental models it is conceivable that the observed inhibition of experimental bladder carcinogenesis is brought about by an increased capacity of the proliferating urothelial cells to repair carcinogen-induced DNA damage. Further studies are required to elucidate the significance of a stimulated proliferation for the repair system and neoplastic transformation of the urothelium.
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Supported by the Deutsche Forschungsgemeinschaft (Ku 410/33). Presented in part at the 2nd Symposium of the Section of Experimental Cancer Research of the German Cancer Society Heidelberg, 1983, and at the 67th Congress of the Deutsche Gesellschaft für Pathologie, Luzern 1983.
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Kunze, E., Wöltjen, HH. & Niemann, U. Inhibitory effect of partial cystectomy on experimental carcinogenesis in the urinary bladder. J Cancer Res Clin Oncol 106, 123–129 (1983). https://doi.org/10.1007/BF00395390
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DOI: https://doi.org/10.1007/BF00395390