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Master's Dissertation
DOI
https://doi.org/10.11606/D.10.2004.tde-12042007-182154
Document
Author
Full name
Alexandro dos Santos Rodrigues
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2004
Supervisor
Committee
Blazquez, Francisco Javier Hernandez (President)
Farias, Eduardo Cunha
Mariana, Arani Nanci Bomfim
Title in Portuguese
Expressão e distribuição da conexina 32 em fígados com fibrose experimentalmente induzida
Keywords in Portuguese
Conexina 32
Dimetilnitrosamina
Fibrose hepática
Abstract in Portuguese
A conexina 32 (Cx32) é uma estrutura protéica que constitui os canais que promovem as comunicações intercelulares via junções comunicantes (GJIC), permitindo difusão de pequenas moléculas citoplasmáticas de uma célula à outra. Este trabalho objetivou os estudos destas estruturas devido a sua importância em processos hepáticos, mais especificamente, a fibrose hepática. O presente estudo foi realizado através da administração oral da droga hepatotoxica dimetilnitrosamina (DMN) em ratas Wistar duas vezes por semana em dias consecutivos no prazo de cinco semanas. A necropsia destes animais foi realizada após cinco semanas da última administração da droga e revelou um quadro de fibrose hepática, em contra partida aos resultados obtidos em um grupo controle com a mesma quantidade de animais. O material fibrótico foi submetido à análise imunohistoquímica que revelou uma presença preferencial de Cx32 dispersa no citoplasma, o que pode levar à hipótese de problemas no mecanismo de transporte citoplasmático destas estruturas, em contrapartida ao material pertencente ao grupo controle que evidenciou a presença das Cx32 na membrana plasmática formando placas juncionais. Quando submetido à análises moleculares o fígado fibrótico revelou uma diminuição da expressão gênica embora o produto protéico deste material quando comparado ao grupo controle não tenha se mostrado diminuído.
Title in English
Expression and distribution of connexin 32 in liver with experimentally induced fibrosis
Keywords in English
Connexin 32
Dimethylnitrosamine
Hepatic fibrosis
Abstract in English
The connexin 32 (Cx32) is a proteic structure that constitute the channels that promote the cell communication by means of the gap junction (GJIC), allowing the diffusion of short cytoplasmic molecules from a cell to another. This work aimed to study these structures due to their importance in the hepatic metabolic processes. The hepatic fibrosis was triggered by the oral administration of dimethylnitrosamine (DMN) in the female rat Wistars twice a week in consecutive days during five weeks. The necropsy of these animals was carried out after the last drug administration. They presented a hepatic fibrosis state. The fibrotic material was submitted to the imunohistochemical analysis, which showed a preferencial presence of Cx32 in the cytoplasm, whereas in the control group the Cx32 was located at the membranes, in the junctional plaques. The molecular analysis showed a decrease of the genic expresson of the fibrotic material, however the proteic product wasn? t reduced in comparison with the control group as it was shown by western blot. We concluded that the fibrotic state introduced a disturbance in the intracellular distribution and genic expression of the connexin 32.
 
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Publishing Date
2007-04-16
 
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