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https://www.arca.fiocruz.br/handle/icict/33489
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2020-01-06
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EXPRESSION OF METALLOPROTEINASES (MMP-1, MMP-2, AND MMP-9) AND THEIR INHIBITORS (TIMP-1 AND TIMP-2) IN SCHISTOSOMAL PORTAL FIBROSIS
Affilliation
Quilmes National University. Laboratory of Molecular Oncology. Department of Science and Technology. Buenos Aires, Argentina.
Quilmes National University. Laboratory of Molecular Oncology. Department of Science and Technology. Buenos Aires, Argentina.
Quilmes National University. Laboratory of Molecular Oncology. Department of Science and Technology. Buenos Aires, Argentina.
Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil.
Quilmes National University. Laboratory of Molecular Oncology. Department of Science and Technology. Buenos Aires, Argentina.
Quilmes National University. Laboratory of Molecular Oncology. Department of Science and Technology. Buenos Aires, Argentina.
Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil.
Abstract
Focal extracellular matrix degradation morphologically identified in human portal pipestem fibrosis due to Schistosoma mansoni did not express immunohistochemical reactivity for metalloproteinases (MMP-1, MMP-2, and MMP-9) and their inhibitors (TIMP-1 and TIMP-2). However, when active schistosomal periovular granulomas were present, a strong reactivity for MMP-1, MMP-2, TIMP-1, and TIMP-2 was observed. No reactivity was ever observed for MMP-9. However, the positive pattern of immunohistochemical expression was not seen in old fibrotic periovular granulomas, which were sometimes situated in other areas of the same microscopic section. Positive staining for MMPs and TIMPs was observed at the same time in hepatocytes and within the apical portion of bile duct epithelium. These findings are consistent with the concept that matrix degradation in recent and old fibroses, in addition to differing at the ultrastructural level, also differs in immunohistochemical expression of metalloproteinases and their inhibitors.
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