American Journal of Respiratory Cell and Molecular Biology. Vol. 28, pp. 555-562, 2003
© 2003 American Thoracic Society DOI: 10.1165/rcmb.2002-0090OC
Alveolar Wall Apoptosis Causes Lung Destruction and Emphysematous Changes
Kazutetsu Aoshiba,
Naoko Yokohori and
Atsushi Nagai
First Department of Medicine, Tokyo Women's Medical University, Tokyo, Japan
Address correspondence to: Kazutetsu Aoshiba, M.D., First Department of Medicine, Tokyo Women's Medical University, 8-1 Kawada-cho, Shinjuku-ku, Tokyo 162-8666, Japan. E-mail: kaoshiba{at}chi.twmu.ac.jp
Pulmonary emphysema is characterized by alveolar wall destruction and airspace enlargement. Recent evidence indicates that epithelial or endothelial apoptosis may be involved in the pathogenesis of emphysema. Here, we describe the induction of emphysematous changes, including airspace enlargement, alveolar wall destruction, and enhanced lung distensibility, in mice receiving a single intratracheal injection of active caspase-3 and Chariot, a newly developed protein transfection reagent. Epithelial apoptosis and enhanced elastolytic activity (optimal at pH 5.5) in bronchoalveolar lavage were noted. Emphysematous changes were also generated in mice receiving an intratracheal injection of nodularin, a proapoptotic serine/threonine kinase inhibitor. This murine model provides direct evidence that confirms that alveolar wall apoptosis causes emphysematous changes. Furthermore, this simple technique for protein transfection of lung tissue can be used in a variety of future applications.
Abbreviations: bronchoalveolar lavage, BAL Dulbecco's modified Eagle's medium, DMEM dimethyl sulfoxide, DMSO cell-extracellular matrix, ECM fluorescein isothiocyanate, FITC horseradish peroxidase, HRP phosphate-buffered saline, PBS single-stranded DNA, ssDNA terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling, TUNEL
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