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- W2016097793 abstract "The replication kinetics and cytological changes of normal human oral keratinocytes (NHOK) isolated from the basal surface of oral epithelial sheet and cultured as dispersed cells in low (0.15 mM) Ca(2+) medium without serum were analyzed. Replicating NHOK were quantitated by cell count and identified by [(3)H]thymidine uptake. Cell morphology was analyzed by phase contrast and transmission electron microscopy, and by cytochemical staining for endogenous beta-galactosidase (beta-gal) activity, involucrin, and cytokeratin types 1 and 10 (K1/K10). Primary NHOK obtained from 15 different donors whose ages ranged from 21 to 62 years consistently showed three distinct phases of replication, i.e., exponential, senescing, and senescent, which were independent of the donors' age. Initially, the cells replicated exponentially for a period of 20 days with a doubling time of 26.6 +/- 3.5 h. They then gradually entered replication arrest over a period of 18 days. The cells underwent a maximum of 22.1 +/- 2.8 population doublings. The onset of gradual replication arrest coincided with an increase in the fraction of cells, which stopped DNA synthesis within a maximum of 48 h and which stained for beta-gal. The fraction of terminally differentiated cells stained for K1/K10 did not increase until nearly all the cells had stopped replicating (senescent phase) and maximal beta-gal staining had been reached. Subsequently, the percentage of beta-gal stained cells actually decreased while the percentage of those stained for K1/K10 increased to a maximum of 80-90% within 2-3 weeks. Exposure of exponentially replicating NHOK to 5-aza-2'-deoxycytidine (5-aza CdR) inhibited DNA replication within 18-48 h and induced terminal differentiation 6 days later. In contrast, exposure of these cells to 1.5 mM Ca(2+) induced expression of involucrin and K1/K10 within 48 h without inhibiting DNA synthesis. Thus, replication arrest preceded differentiation in NHOK serially subcultured in vitro; however, differentiation could be induced without replication arrest." @default.
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- W2016097793 date "2000-08-01" @default.
- W2016097793 modified "2023-09-27" @default.
- W2016097793 title "In Vitro Replication and Differentiation of Normal Human Oral Keratinocytes" @default.
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- W2016097793 doi "https://doi.org/10.1006/excr.2000.4943" @default.
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