Summary
The pseudostratified tracheal epithelium, composed of a heterogeneous phenotypically varying cell population, was studied with respect to the in vitro cell proliferative activity of differentiated epithelial cells. Ciliated tracheal epithelial cells so far have been considered to be terminally differentiated, nonproliferating cells. Tracheal organ cultures obtained from vitamin A-deprived Syrian Golden hamsters were cultured in a vitamin A-deficient, serum-free, hormone-supplemented medium. In vitamin A-deprived tracheal epithelium treated with physiologically active all-trans retinol and low cigarette-smoke condensate concentrations it is possible to stimulate the cell proliferation of both basal and columnar cells. Therefore, the probability of finding proliferating columnar cells was increased compared with the in vivo and the vitamin A-deprived situation in which cell proliferative activity is relatively low. In the presence of cigarette-smoke condensate in a noncytotoxic concentration, basal, small mucous granule, ciliated, and indifferent tracheal epithelial cells incorporated [methyl-3H]-thymidine into the DNA during the S phase. The finding that ciliated cells were labeled was supported by serial sections showing the same labeled ciliated cell in two section planes separated by 2 to 3 μm, without labeled epithelial cells next to the ciliated cell. Furthermore, a ciliated tracheal epithelial cell incorporating [methyl-3H]thymidine into DNA was also seen in tracheal cultures of vitamin A-deprived hamsters treated with all-trans retinol in a physiologic concentration.
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The present study was financially supported by the Scientific Advisory Committee on Smoking and Health (Dutch Cigarette Industry Foundation) and the Ministry of Welfare, Health and Cutural Affairs.
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Rutten, A.A.J.J.L., Beems, R.B., Wilmer, J.W.G.M. et al. Ciliated cells in vitamin A-deprived cultured hamster tracheal epithelium do divide. In Vitro Cell Dev Biol 24, 931–935 (1988). https://doi.org/10.1007/BF02623905
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DOI: https://doi.org/10.1007/BF02623905