New insights about myofibrillar myopathies: the role of metalloproteinases 2 and 9 in the pathogenesis
Backgroung: There are few reports suggesting that gene expression and activation of various matrix metalloproteinases (MMPs) are deregulated. MMP-2 and MMP-9 represent the two MMPs, which degrade type IV collagen, the component of basement membrane. Methods: We analysed the involvement of gelatinase...
| Authors: | , , , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2022 |
| Country: | Brasil |
| Institution: | Universidade Estadual Paulista "Júlio de Mesquita Filho" (UNESP) |
| Repository: | Journal of Human Growth and Development (Online) |
| Language: | English |
| OAI Identifier: | oai:ojs.www2.marilia.unesp.br:article/12913 |
| Online Access: | https://revistas.marilia.unesp.br/index.php/jhgd/article/view/12913 |
| Access Level: | Open access |
| Keyword: | MMP-2, MMP-9, Myofibrillar myopathy, muscle biopsy, metalloproteinase MMP-2, MMP-9, Miopatia miofibrilar, biópsia muscular, metaloproteinase. |
| Summary: | Backgroung: There are few reports suggesting that gene expression and activation of various matrix metalloproteinases (MMPs) are deregulated. MMP-2 and MMP-9 represent the two MMPs, which degrade type IV collagen, the component of basement membrane. Methods: We analysed the involvement of gelatinases, MMP-2 and MMP-9, in the pathogenesis of myofibrillar myopathy (MFM). Muscle specimens from 23 patients well diagnosed with MFM, were immunostained by MMP-2 and MMP-9. We analysed qualitatively the immunoexpression in three compartments: subsarcolemmal (SSC), intracytoplasmic (ICC) and perinuclear (PNC). Results: 95,7% and 100% samples showed MMP-2 and MMP-9 upregulation ICC, respectively. PNC showed MMP-2 (82,6%) and MMP-9 (8,7%) regulation (p<0.001). SSC and ICC did not present statistical significance. There was no correlation between mutated gene and immunohistochemical pattern distribution. Discussion: Our results suggest that MMP-2 and/or MMP-9 could participate in the pathomechanism of MFM, causing damage of sarcomere and deposition of protein aggregates. |
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