ABSTRACT
OBJECTIVE: to develop an experimental model of exposure to tobacco burning (cigarette) products to assess the effects of its chronic use in relation to cancers of the bladder. METHODS: the animals were chronically exposed to the burning tobacco products in a semi-open chamber to simulate smoking. Thirty young Wistar rats were divided into two groups: one with 20 animals simulating smoking for six months, and ten not exposed control animals for the same period. After exposure by inhalation of cigarette smoke, animals were euthanized and subjected to histopathological study of the bladder wall. RESULTS: no tumor was found but mild and non significant alterations. The studies of hemo-oximetry (carboxyhemoglobin and methemoglobin) and the concentration of carbon dioxide (CO2) confirm that the animals were exposed to high concentrations of tobacco smoke and its derivatives. CONCLUSION: no bladder mucosal neoplasia was found in the pathological study of animals. The developed experimental models were highly efficient, practical and easy to use and can be used in other similar studies to determine the harmful effects caused by smoking. .
OBJETIVO: desenvolver modelo experimental de exposição aos produtos da queima do tabaco (cigarro) para avaliar os efeitos do seu uso crônico em relação às neoplasias de bexiga. MÉTODOS: Os animais foram expostos cronicamente aos produtos da queima do tabaco em câmara semi-aberta para simular o tabagismo. Trinta ratos jovens da raça Wistar foram distribuídos em dois grupos: um com 20 animais simulando o tabagismo por período de seis meses, e um com dez animais controle sem exposição por igual período. Após exposição por inalação da fumaça do cigarro, os animais foram eutanasiados e submetidos a estudo histopatológico da parede da bexiga. RESULTADOS: Não foi encontrada neoplasia e sim alterações leves e não significativas. Os estudos da hemo-oximetria (carboxiemoglobina e metemoglobina) e da concentração de dióxido de carbono (CO2) confirmam que os animais foram expostos a altas concentrações da fumaça do tabaco e de seus derivados. CONCLUSÃO: No estudo anatomopatológico dos animais não foi encontrada neoplasia na mucosa da bexiga. Os modelos experimentais desenvolvidos foram altamente eficientes, práticos e fáceis de usar podendo ser empregados em outros estudos semelhantes para determinar os efeitos nocivos causados pelo tabagismo. .
Subject(s)
Animals , Male , Rats , Disease Models, Animal , Tobacco Products , Urinary Bladder Neoplasms/etiology , Neoplasms, Experimental/etiology , Rats, WistarABSTRACT
Fishes and vegetables are preserved by salting and sundrying; and later fried in oil and consumed. Such preparations have been found to contain polycyclic aromatic hydrocarbons, and are genotoxic and mutagenic. The potential carcinogenic effects of these and other dietary items have been studied by oral feeding to swiss mice at 100 mg/animal/day for 12 months; and observing upto two years. When so prepared and tested, chillies (Capsicum annum L.) produce adenocarcinomas in the abdomen in 35% of animals; Sundakkai (Solanum torvum), hepatic heamangiomas in 30%; Ribbon fish (Trichurus lepturus), squamous gastric carcinoma in 20%; cluster beans (Cyomopsis tetragonoloba), fat deposition throughout the abdomen. While whitebait fish (Stolephorus bataviensis) and seer fish (Scomberomorus commersonnii) have no effect. Fried mustard (Brassica juncea) causes severe necrosis of the liver (25%), but no tumours. Consumption of oil fried foods in high doses can lead to variety of deleterious biological effects. Raw cinnamon (Cinnamon zelanicum) is tumourigenic, inducing squamous pappillomas in some and poorly differentiated carcinomas in others.