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Experimental model of biliary obstruction in young rats: histological analysis and pharmacological modulation with prednisolone e pentoxifylline

Grant number: 09/07225-2
Support type:Regular Research Grants
Duration: August 01, 2009 - July 31, 2011
Field of knowledge:Health Sciences - Medicine - Surgery
Principal researcher:Uenis Tannuri
Grantee:Uenis Tannuri
Home Institution: Faculdade de Medicina (FM). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

Many chronic liver diseases lead to progressive establishment of hepatic fibrosis, condition that can ultimately result in loss of organ function and severe portal hypertension demanding hepatic transplantation. The exact physiopathology of that process is not fully understood. Within the last decades, some studies have been conducted in order to demonstrate the possibility of drug modulation of hepatic fibrogenesis. Particularly related to biliary obstruction, it has been suggested that administration of corticosteroids could promote better late outcomes for biliary atresia children submitted to Kasai's portoenterostomy. There is no published experimental study related to that issue, and described models used to test potential antifibrogenic drugs, such as pentoxifylline, have not included growing animals. The proposition of this project is to manage an experimental study in order to analyze fibrogenesis and ductular proliferation secondary to biliary obstruction in growing animals and to analyze how corticosteroid and pentoxifylline administration affect those processes. Around 100 weaning Wistar rats (21st or 22nd days) will be submitted to laparotomy and common bile duct ligation (CBDL) or sham surgery (SHAM). Animals will be allocated into 5 groups, according to surgical procedure and administered solution: 1. CBDL + distilled water; 2. SHAM + distilled water; 3. CBDL + pentoxifylline (PTX); 4. CBDL + prednisolone (PRED); 5. CBDL + pentoxifylline + prednisolone (PTX+PRED). Each group will be further divided into 2 subgroups according to the length of the experiment (15 or 30 days). At the end of the defined period, animals will be weighed and a hepatic fragment will be collected from each one for histological (hematoxylin-eosin and Sirius red stains) and immunohistochemical / immunofluorescent analysis (using monoclonal antibodies against collagen III, TGF², VEGF and cytokeratin 7). Slides will be examined for quantitative analysis of marked areas (digital morphometry) and data obtained will be statistically processed to determine difference among groups. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
WAGNER DE CASTRO ANDRADE; LUIZ FERNANDO FERRAZ DA SILVA; MARIA CECILIA DE MENDONÇA COELHO; ANA CRISTINA AOUN TANNURI; VENANCIO AVANCINI FERREIRA ALVES; UENIS TANNURI. Effects of the administration of pentoxifylline and prednisolone on the evolution of portal fibrogenesis secondary to biliary obstruction in growing animals: immunohistochemical analysis of the expression of TGF-β and VEGF. Clinics, v. 67, n. 12, p. -, Dez. 2012.
ANDRADE, WAGNER DE CASTRO; FERRAZ DA SILVA, LUIZ FERNANDO; DE MENDONCA COELHO, MARIA CECILIA; AOUN TANNURI, ANA CRISTINA; FERREIRA ALVES, VENANCIO AVANCINI; TANNURI, UENIS. Effects of the administration of pentoxifylline and prednisolone on the evolution of portal fibrogenesis secondary to biliary obstruction in growing animals: immunohistochemical analysis of the expression of TGF-BETA; and VEGF. Clinics, v. 67, n. 12, p. 1455-1461, 2012. Web of Science Citations: 3.
SANTOS, M. M.; TANNURI, U.; TANNURI, A. C. A.; COELHO, M. C. M. Description of a New Model of Intestinal Denervation and In Situ Ischemia-Reperfusion Injury Using the Cecal Artery for Perfusion. Transplantation Proceedings, v. 41, n. 9, p. 3617-3621, NOV 2009. Web of Science Citations: 1.

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