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Secretory cell differentiation and mucus secretion in cultures of human nasal epithelial cells: use of a monoclonal antibody to study human nasal mucin.
We have developed an air-liquid interface culture system for human nasal epithelial cells that differentiate into mucociliary phenotypes in a defined serum-free medium. Dissociated cells obtained from nasal polyps were cultured on a collagen gel substrate. At confluence, the cells lost characteristics of differentiated cells, and secretory cell and ciliated cell differentiation appeared after 7 days in an air-liquid interface. After 21 days, about half of the epithelial cells were stained with Alcian blue-periodic acid-Schiff stain or monoclonal antibody HCS18, which was directed against human nasal mucin specific for epithelial secretory (goblet) cells. The quantitative examination using the antibody HCS18 revealed that the antibody-reactive nasal mucin was secreted only on the apical side of the cultures, and interleukin-1beta and tumor necrosis factor alpha stimulated these mucus secretions. The culture system with an antimucin monoclonal antibody developed in this study should be useful for studying polarized mucus secretion from human nasal epithelial cells.
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