Please use this identifier to cite or link to this item: https://www.arca.fiocruz.br/handle/icict/4213
Title: Fibrogenesis and collagen resorption in the heart and skeletal muscle of Calomys callosus experimentally infected with Trypanosoma cruzi: immunohistochemical identification of extracellular matrix components.
Authors: Santos, Isis Fernandes Magalhães
Lima, Elianita Suzart de
Andrade, Sonia Gumes
Affilliation: Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil
Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil
Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil
Abstract: Intense inflammatory lesions and early development of interstitial fibrosis of the myocardium and skeletal muscle with spontaneous regression, have been described in Calomys callosus infected with Trypanosoma cruzi. The genetic types of collagen present in this model were investigated through immunohistochemistry using specific antibodies, combined with histopathology and Picro-Sirius staining of collagen. Thirty-five calomys were infected with the Colombian strain of T. cruzi and sacrificed at 24, 30, 40, 60 and 90 days post-infection. Inflammatory lesions and fibrogenesis were prominent at the early phase of infection and significantly decreased during late infection. Immunoisotyping of the matrix components was performed by indirect immunofluorescence on 5 micro m thick cryostat sections using specific antibodies against laminin, fibronectin and isotypes I, III and IV of collagen. In the early phase, positive deposits of all the matrix components were present, with predominance of fibronectin, laminin and collagens types I and III in the myocardium and of types III and IV in the skeletal muscles. From the 40th day, type IV collagen predominates in the heart. At the late phase of infection (60th to 90th day), a clear fragmentation and decrease of all the matrix components were detected. Findings of the present study indicate that a modulation of the inflammatory process occurs in the model of C. callosus, leading to spontaneous regression of fibrosis independent of the genetic types of collagen involved in this process.
Keywords: Trypanosoma cruzi
Calomys callosus
Myocardial fibrosis
Collagen immunotyping
Ininterstitial matrix
Miocárdio/patologia
DeCS: Cardiomiopatia Chagásica/patologia
Colágeno/genética
Matriz Extracelular/química
Músculo Esquelético/patologia
Animais
Cardiomiopatia Chagásica/metabolismo
Colágeno/metabolismo
Fibrose
Imunoistoquímica
Músculo Esquelético/metabolismo
Roedores
Issue Date: 2002
Citation: MAGALHAES-SANTOS, I.F.; LIMA, E.S.; ANDRADE, S.G. Fibrogenesis and collagen resorption in the heart and skeletal muscle of Calomys callosus experimentally infected with Trypanosoma cruzi: immunohistochemical identification of extracellular matrix components. Memórias do Instituto Oswaldo Cruz, v. 97, n. 5, p. 703-10, jul. 2002.
ISSN: 0074-0276
Copyright: open access
Appears in Collections:BA - IGM - Artigos de Periódicos

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