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Type: Artigo de periódico
Title: Inhibition of tumor necrosis factor-alpha and cyclooxigenase-2 by Isatin: A molecular mechanism of protection against TNBS-induced colitis in rats
Author: Socca, EAR
Luiz-Ferreira, A
de Faria, FM
de Almeida, AC
Dunder, RJ
Manzo, LP
Brito, ARMS
Abstract: Isatin, an indole alkaloid has been shown to have anti-microbial, anti-tumor and anti-inflammatory effects. Due to its findings, we evaluated whether this alkaloid would have any effect on TNBS-induced colitis. Animals (male Unib:WH rats, aged 8 weeks old) were induced colitis through a rectal administration of 2,4,6-trinitrobenzene sulphonic acid using a catheter inserted 8 cm into the rectum of the animals. The rats were divided into two major groups: non-colitic and colitic. The colitic group was sub-divided into 6 groups (10 animals per group): colitic non-treated, Isatin 3; 6; 12.5; 18.75 and 25 mg/kg. Our main results showed that the oral treatment with Isatin 6 and 25 mg/kg were capable of avoiding the increase in TNF-alpha, COX-2 and PGE(2) levels when compared to the colitic non-treated group. Interestingly, the same doses (6 and 25 mg/kg) were also capable of preventing the decrease in IL-10 levels comparing with the colitic non-treated group. The levels of MPO, (an indirect indicator of neutrophil presence), were also maintained lower than those of the colitic non-treated group. Isatin also prevented the decrease of SOD activity and increase of GSH-Px and GSH-Rd activity as well as the depletion of GSH levels. In conclusion, both pre-treatments (6 and 25 mg/kg) were capable of protecting the gut mucosa against the injury caused by TNBS, through the combination of antioxidant and anti-inflammatory properties, which, together, showed a protective activity of the indole alkaloid Isatin. (C) 2013 Elsevier Ireland Ltd. All rights reserved.
Subject: Ulcerative colitis
Country: Irlanda
Editor: Elsevier Ireland Ltd
Citation: Chemico-biological Interactions. Elsevier Ireland Ltd, v. 209, n. 48, n. 55, 2014.
Rights: fechado
Identifier DOI: 10.1016/j.cbi.2013.11.019
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

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