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Tipo do documento: Artigo
Título: Intrinsic denervation of the colon is associated with a decrease of some colonic preneoplastic markers in rats treated with a chemical carcinogen
Autor: Vespúcio, Marcelo Vinícius Oliveira
Turatti, Aline
Modiano, Patrícia
Oliveira, Enio Chaves de
Chicote, Sérgio Renato Macedo
Corrado, Alexandre Pinto
Garcia, Sérgio Britto
Abstract: Denervation of the colon is protective against the colon cancer; however, the mechanisms involved are unknown. We tested the hypothesis that the denervated colonic mucosa could be less responsive to the action of the chemical carcinogen dimethylhy- drazine (DMH). Three groups of 32 male Wistar rats were treated as follows: group 1 (G1) had the colon denervated with 0.3 mL 1.5 mM benzyldimethyltetradecylammonium (benzalkonium chloride, BAC); G2 received a single ip injection of 125 mg/kg DMH; G3 was treated with BAC + the same dose and route of DMH. A control group (Sham, N = 32) did not receive any treatment. Each group was subdivided into four groups according to the sacrifice time (1, 2, 6, and 12 weeks after DMH). Crypt fission index, ß- catenin accumulated crypts, aberrant crypt foci, and cell proliferation were evaluated and analyzed by ANOVA and the Student t-test. G3 animals presented a small number of aberrant crypt foci and low crypt fission index compared to G2 animals after 2 and 12 weeks, respectively. From the second week on, the index of ß-catenin crypt in G3 animals increased slower than in G2 animals. From the 12th week on, G2 animals presented a significant increase in cell proliferation when compared to the other groups. Colonic denervation plays an anticarcinogenic role from early stages of colon cancer development. This finding can be of importance for the study of the role of the enteric nervous system in the carcinogenic process
Palavras-chave: Colon cancer
Benzalkonium chloride
Aberrant crypt foci
País: Brasil
Unidade acadêmica: Faculdade de Medicina - FM (RG)
Citação: VESPUCIO, M. V. O. et al. Intrinsic denervation of the colon is associated with a decrease of some colonic preneoplastic markers in rats treated with a chemical carcinogen. Brazilian Journal of Medical and Biological Research, Ribeirão Preto, v. 41, n. 4, p. 1-7, 2008.
Tipo de acesso: Acesso Aberto
Identificador do documento: 10.1590/S0100-879X2008005000008
Identificador do documento: 10.1590/S0100-879X2008005000008
Data de publicação: 2008
Aparece nas coleções:FM - Artigos publicados em periódicos

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