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- W7488085 abstract "Human surface respiratory epithelial (HSRE) cells from nasal polyps have been cultured within collagen lattices in a serum-free defined medium. Cell growth observed over a period of 12 days showed a population doubling time of 36 h. Under these culture conditions, we observed a contraction of the lattices. Phase-contrast light microscopy and transmission electron microscopy demonstrated that the HSRE cells formed tubular ductlike structures. Lumens formed by HSRE cells were surrounded by cuboidal-shaped polarized cells with numerous ciliated cells, secretory cells, and undifferentiated cells. Epidermal growth factor (EGF) was observed to stimulate the tubule formation and the contraction of the lattices. Videomicroscopic observations and analysis of the ciliary beating frequency (CBF) demonstrated that the cilia were homogeneously distributed on the whole apical surface of the ciliated cells and that their movement was well coordinated, with a CBF similar to that observed in outgrowth cells from cultured human nasal and tracheal epithelia. Immunofluorescent staining of basement membrane components synthesized and secreted by cells revealed the presence of type III collagen around the tubules. Type IV collagen and laminin were present in the cytoplasm and at the periphery of the cells. The biotin-streptavidin-gold immunocytochemical technique with monoclonal anti-mucin antibody showed intracellular localization of mucins in secretory granules of the secretory cells. With the use of substrate gel electrophoresis polyacrylamide gels impregnated with gelatin, collagenase activity was detected in the conditioned medium of the cultured HSRE cells. These results suggest that both three-dimensional collagen gel and soluble factors such as EGF regulate tubule formation by HSRE cells. Moreover, the capacity of the epithelial cells to contract the gel suggests they may be involved in the wound healing process." @default.
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- W7488085 date "1993-02-01" @default.
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- W7488085 title "Tubule formation by human surface respiratory epithelial cells cultured in a three-dimensional collagen lattice" @default.
- W7488085 doi "https://doi.org/10.1152/ajplung.1993.264.2.l183" @default.
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