Complex Integration of Matrix, Oxidative Stress, and Apoptosis in Genetic Emphysema
AUTOR(ES)
Podowski, Megan
FONTE
American Society for Investigative Pathology
RESUMO
Alveolar enlargement, which is characteristic of bronchopulmonary dysplasia, congenital matrix disorders, and cigarette smoke-induced emphysema, is thought to result from enhanced inflammation and ensuing excessive matrix proteolysis. Although there is recent evidence that cell death and oxidative stress punctuate these diseases, the mechanistic link between abnormal lung extracellular matrix and alveolar enlargement is lacking. We hypothesized that the tight-skin (TSK) mouse, which harbors a spontaneous internal duplication in the microfibrillar glycoprotein fibrillin-1, might show whether matrix alterations are sufficient to promote oxidative stress and cell death, injury cascades central to the development of clinical emphysema. We observed no evidence of increased metalloprotease activation by histochemical and zymographic methods. We did find initial oxidative stress followed by increased apoptosis in the postnatal TSK lung. Both blunted antioxidant production and reduced extracellular superoxide dismutase activity were evident in the neonatal lung. High-dose antioxidant treatment with N-acetylcysteine improved airspace caliber and attenuated oxidative stress and apoptosis in neonatal and adult TSK mice. These data establish that an abnormal extracellular matrix without overt elastolysis is sufficient to confer susceptibility to postnatal normoxia, reminiscent of bronchopulmonary dysplasia. The resultant oxidative stress and apoptosis culminate in profound airspace enlargement. The TSK lung exemplifies the critical interplay between extracellular matrix, oxidative stress, and cell-death cascades that may contribute to genetic and acquired airspace enlargement.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=2708797Documentos Relacionados
- Cigarette smoke-induced emphysema in A/J mice is associated with pulmonary oxidative stress, apoptosis of lung cells, and global alterations in gene expression
- Oxidative stress, cell cycle, and neurodegeneration
- Oxygen, oxidative stress, hypoxia, and heart failure
- Hypoperfusion, Mitochondria Failure, Oxidative Stress, and Alzheimer Disease
- Integration of Growth Factor, Extracellular Matrix, and Retinoid Signals during Bronchial Epithelial Cell Differentiation