Abstract

to evaluate the effect of L-lysine in the bladder and intestinal epithelia in rats submitted to vesicosigmoidostomy. we divided forty Wistar rats into four groups: group I - control group (Sham); group II - submitted to vesicosigmoidostomy and treated with L-lysine 150mg/kg; group III - submitted only to vesicosigmoidostomy; and group IV - received L-lysine 150mg/kg. After eight weeks the animals were sacrificed. in the bladders of all operated animals we observed simple, papillary and nodular hyperplasia of transitional cells, transitional cell papillomas and squamous metaplasia. As for the occurrence of aberrant crypt foci in the colons of operated animals, we did not observe statistically significant differences in any of the distal, proximal and medium fragments, or in all fragments together (p=1.0000). Although statistically there was no promotion of carcinogenesis in the epithelia of rats treated with L-lysine in the observed time, it was clear the histogenesis of bladder carcinogenesis in its initial phase in all operated rats, this being probably associated with chronic infection and tiny bladder stones. o objetivo deste trabalho é avaliar o efeito da L-lisina nos epitélios vesical e intestinal de ratas submetidas à vesicossigmoidostomia. quarenta ratas Wistar, foram divididas em quatro grupos: grupo I- grupo controle (Sham); grupo II- submetido à vesicossigmoidostomia e tratado com L-lisina 150mg/kg; grupo III- submetido apenas à vesicossigmoidostomia; e grupo IV- recebeu L-lisina 150mg/kg. Após oito semanas os animais foram sacrificados. na bexiga de todos os animais operados observou-se hiperplasia simples, papilar e nodular de células transicionais, papiloma de células transicionais e metaplasia escamosa. Quanto à ocorrência de focos de criptas aberrantes nos colos dos animais operados, não foi evidenciado diferença estatística significante em nenhum dos fragmentos distal, proximal e médio, e todos juntos (P=1,0000). apesar de, estatisticamente, não ter havido promoção de carcinogênese nos epitélios dos ratos tratados com L-lisina, no tempo observado, é nítida a histogênese da carcinogênese de bexiga em sua fase inicial, no epitélio vesical, em todos os ratos operados, estando esta provavelmente associada à infecção crônica e aos diminutos cálculos vesicais.

Highlights

  • Hammer described the first case of carcinoma in ureterosigmoidostomy in 19291

  • The objective of this study is to evaluate the effect of this amino acid in the bladder and intestinal epithelia of animals undergoing urinary diversion by vesicosigmoidostomy, a classic experimental surgical carcinogenesis model[4]

  • In all operated animals we macroscopically observed polypoid lesions located in the anastomoses regions and bladder epithelium

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Summary

Introduction

Hammer described the first case of carcinoma in ureterosigmoidostomy in 19291. The risk of cancer in anastomoses areas or bowel of patients undergoing surgery for urinary derivations, bladder expansions or bladder replacements with intestinal segments is known for a long time. But transitional cell carcinomas have been described. The lag time between urinary bypass surgery and the onset of cancer is long, the risk of cancer after ureterosigmoidostomy is estimated at 200 to 500 times compared with the general population. Dornelas et al.[3] found that L‐lysine has promotes bladder chemical carcinogenesis in rats. The objective of this study is to evaluate the effect of this amino acid in the bladder and intestinal epithelia of animals undergoing urinary diversion by vesicosigmoidostomy, a classic experimental surgical carcinogenesis model[4]

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