Am. J. Respir. Cell Mol. Biol., Vol 10, No. 3, Mar 1994, 271-277.
Ciliogenesis in human bronchial epithelial cells cultured at the air- liquid interface
PM de Jong, MA van Sterkenburg, SC Hesseling, JA Kempenaar, AA Mulder, AM Mommaas, JH Dijkman and M Ponec
Department of Pulmonology, University Hospital, Leiden, the Netherlands.
We present a study on modification of culture conditions in serially
cultured human bronchial epithelial cells (HBEC), necessary to achieve
bronchial epithelial cells similar to the native epithelium. Cells were
obtained from bronchial biopsies and serially cultured using a previously
described method (In Vitro Cell. Dev. Biol. 1993; 29A:379- 387). At the
air-liquid interface, the second and the subsequent passages of HBEC
cultures were grown 7 to 31 days, in medium containing fetal calf serum,
using de-epidermized dermis or collagen discs as substratum. Scanning and
transmission electron microscopy revealed ciliogenesis after 7 days and
maturation of the cilia up to 31 days, irrespective of whether
de-epidermized dermis or collagen membrane was used. The transmission
electron microscopy of the developing cilia showed fibrogranular masses,
procentrioles, basal bodies, and in the mature cilia a normal
ultrastructure of the axoneme, the nine doublets, the central pair, radial
spokes, and dynein arms in the ciliary shaft. In contrast, the submerged
cultures showed no signs of ciliogenesis in the same time course. Results
of experiments, in which cell seeding density, the substrate used, and the
manner of nutrient supplementation were modulated, revealed that the
air-exposure of the cultured HBEC is a necessary requirement for the
ciliogenesis. The development pathway of ciliated cells in air-exposed HBEC
cultures was similar to the differentiation and maturation pattern in human
fetal tracheal cells. The in vitro model of human bronchial epithelial
cells derived from biopsies obtained by fiberoptic bronchoscopy offers an
attractive model for future studies on the function of human bronchial
epithelial cells under normal and pathologic conditions.
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Copyright © 1994 American Thoracic Society.
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