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- W2090196544 abstract "Elastolysis, collagenolysis and gelatinolysis are essential in the pathogenesis of tobacco smoke-induced emphysema; however, these activities have been scantily studied in emphysema secondary to woodsmoke. The aim of this study was to analyze elastolysis, collagenolysis and gelatinolysis, MMP-1, MMP-2, and MMP-9 expression, and apoptosis in guinea pigs exposed to smoke produced by 60 g/day of pine wood, 5 days/week, from 1 to 7 months. Histological analysis after 4 to 7 months in smoke exposed guinea pigs showed alveolar mononuclear phagocyte and lymphocytic peribronchiolar inflammation, epithelial and smooth muscle hyperplasia, and pulmonary arterial hypertension. Mild to moderate emphysematous lesions were observed in woodsmoke-exposed animals at 4 to 7 months by increase of mean linear intercepts. A higher percentage of whole blood carboxyhemoglobin (COHb) and elastolytic activity in bronchoalveolar lavage macrophages and lung tissue homogenates was observed at all times. Collagenolysis was increased after 4 to 7 months in woodsmoke-exposed animals, although collagen concentration did not change. Zymography revealed increase in lysis bands of the active MMP-2 and MMP-9 at 4 and 7 months in bronchoalveolar lavage fluid and lung tissue homogenate. Positive immunostaining for MMP-1 and MMP-9 was observed in epithelial cells and macrophages in wood exposed animals at 4 to 7 months. Real-time PCR showed MMP-2 and MMP-9 expression at 3 to 7 months in exposed animals. Furthermore, apoptosis was increased at all times in bronchoalveolar lavage macrophages and lung tissue from exposed animals. Results support a role of metalloproteinases and apoptosis in emphysema secondary to woodsmoke exposure." @default.
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- W2090196544 date "2009-02-01" @default.
- W2090196544 modified "2023-09-28" @default.
- W2090196544 title "Increase of Matrix Metalloproteinases in Woodsmoke-Induced Lung Emphysema in Guinea Pigs" @default.
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- W2090196544 doi "https://doi.org/10.1080/08958370802419145" @default.
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