Presence of Filaments in the Nonciliated Bronchiolar Epithelial (Clara) Cell of Mammalian Lung
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Nonciliated bronchiolar epithelial (Clara) cells of the rat, mouse, guinea pig and hamster were examined by transmission electron microscopy. The luminal surface of the cell was dome-shaped and its central protruding cytoplasm, an apical cap, was covered with microvillilike projections. The cell cortex just beneath the cell membrane of the apical cap consisted of homogeneous matrix. The center of the apical cap was filled with granules, mitochondria and smooth-surfaced endoplasmic reticulum. By perfusing lungs of the four different species with a medium containing detergent, the cytoplasmic matrix of the apical cap was extracted and filaments were found in all the animals examined. The region associated with the plasma membrane was electron-dense and often had a filament network. The presence of filaments and its close relationship with the cell membrane suggest that these filaments play an important role in the discharge of granules and/or in the maintenance of organelles, especially the abundant smoothsurfaced endoplasmic reticulum, in the apical cap.
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