Characterization of the local tissue damage induced by LHF-II, a metalloproteinase with weak hemorrhagic activity isolated from Lachesis muta muta snake venom
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| Autores: | , , , , |
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| Formato: | artículo original |
| Data de Publicação: | 1999 |
| Descrição: | Local tissue damage induced by LHF-II, a 22-kDa hemorrhagic metalloproteinase from Lachesis muta venom was studied. Intravital microscopy experiments evidenced hemorrhagic events 2 min after LHF-II application onto cremaster muscle, characterized by microhemorrhages in capillary vessels and venules. However, histological analysis showed only mild hemorrhage in the gastrocnemius muscle. LHF-II degraded laminin, fibronectin and type IV collagen upon incubation in vitro, but was not cytotoxic to capillary endothelial cells in culture. Intramuscular injection of LHF-II induced a mild myonecrosis, with early small increments in plasma creatine kinase activity. It also induced edema in the mouse footpad at doses where hemorrhage is absent. Injection of LHF-II induced the synthesis of matrix metalloproteinases evidenced in muscle homogenates and in exudate samples. It is concluded that LHF-II has weak hemorrhagic and myotoxic activities, and that its role in the pathogenesis of L. muta-induced local tissue damage is associated with edema formation and degradation of extracellular matrix components, either directly or by activation of endogenous matrix metalloproteinases. |
| País: | Kérwá |
| Recursos: | Universidad de Costa Rica |
| Repositorio: | Kérwá |
| OAI Identifier: | oai:kerwa.ucr.ac.cr:10669/29451 |
| Acesso em linha: | http://www.sciencedirect.com/science/article/pii/S0041010198002682 https://hdl.handle.net/10669/29451 |
| Palavra-chave: | Animals Capillaries Cells, Cultured Creatine Kinase Edema Extravasation of Diagnostic and Therapeutic Materials Foot Hemorrhage Injections, Intramuscular Metalloendopeptidases Mice Microcirculation Muscle, Skeletal Necrosis Peptide Hydrolases Phospholipases A Venules Viperidae Snake venom |