Consulta: subjectFacets:"Dimethylhydrazine"
Registros recuperados: 3
Data/hora: 09/06/2024 13:35:57

Intrinsic denervation of the colon is associated with a decrease of some colonic preneoplastic markers in rats treated with a chemical carcinogen
Provedor de dados: 56
Autores: Vespúcio,M.V.O.; Turatti,A.; Modiano,P.; Oliveira,E.C. de; Chicote,S.R.M.; Pinto,A.M.P.; Garcia,S.B.
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 dimethylhydrazine (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...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colon cancer; Dimethylhydrazine; Benzalkonium chloride; Aberrant crypt foci; SS-catenin; Megacolon.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2008000400009

Trypanosoma cruzi infection and/or administration of the nonsteroidal anti-inflammatory nimesulide increase the number of colonic crypts overexpressing metallothioneins in rat colon carcinogenesis
Provedor de dados: 56
Autores: Escalante,R.D.; de Oliveira,Ê.C.; Cunha,F.Q.; Vespúcio,M.V.O.; Ribeiro-Silva,A.; Aprilli,F.; Garcia,S.B.
Trypanosoma cruzi infection and nonsteroidal anti-inflammatory drugs inhibit colorectal carcinogenesis by mechanisms not completely known and metallothionein proteins (MTs) may be involved in this process. Sixty-six male Wistar rats weighing 90 to 120 g were randomly divided into seven groups (GI to GVII). GI, GII and GIII animals were subcutaneously infected with 200,000 trypomastigote forms of the Y strain of T. cruzi. After 8 weeks, GI, GII, GIV, and GVI were injected with one weekly subcutaneous dose of 12 mg/kg dimethylhydrazine for 4 weeks. In sequence, GI, GIV and GV were treated with nimesulide (10 mg/kg per dose, five times per week for 8 weeks). Groups I, III, IV, and VI had 12 animals, and each of the other groups had 6 animals. All the animals...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trypanosoma cruzi; Nimesulide; Dimethylhydrazine; Metallothioneins; Colon carcinogenesis.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006000700007

Annona crassiflora Mart. fruit pulp effects on biochemical parameters and rat colon carcinogenesis
Provedor de dados: 64
Autores: Venâncio,Vinícius Paula; Ferreira,Eric Batista; Brigagão,Maísa Ribeiro Pereira Lima; Paula,Fernanda Borges de Araújo; Barbisan,Luis Fernando; Azevedo,Luciana.
A. crassiflora Mart. a Brazilian savannah fruit, is a source of phytochemical compounds that possess a wide array of biological activities, including free radical scavenging. This native fruit proved to potentialize the mutagenic process in previous in vivo investigations. The aim of the present study was to investigate the effects of A. crassiflora Mart. pulp intake on colonic cell proliferation and on the development of Aberrant Crypt Foci (ACF) in male Wistar rats. The animals were fed with either a commercial diet or a diet supplemented with A. crassiflora Mart. pulp mixed in 1%, 10% or 20% (w/w) for 4 weeks or 20 weeks. The carcinogen 1,2-dimethylhydrazine dihydrochloride (4 doses, 40 mg kg-1 each) was used to induce colonic ACF. After euthanasia, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aberrant crypt foci; Brazilian savannah; Dimethylhydrazine; Immunohistochemistry; Oxidative stress.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542013000400008