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- W1982161722 abstract "We have successfully isolated a cell line (IEC-1) from an intraepidermal carcinoma of the skin of a patient and compared its behavior, in vitro, to normal human epidermal keratinocytes (HEK) and squamous cell carcinoma cell lines (SCCs). HEK differentiation comprises an initial growth arrest followed by an induction of squamous differentiation-specific genes such as transglutaminase type 1 (TG-1). Using thymidine uptake and TG-1 induction as markers of proliferation and differentiation, respectively, we were able to show that HEKs and the IEC-1 cells undergo growth arrest and induce TG-1 mRNA expression in response to various differentiation-inducing stimuli, while neoplastic SCC cell lines did not. However, differentiation in HEKs was an irreversible process whereas differentiation of the IEC-1 cells was reversible. Furthermore, growth of IEC-1 cells in organotypic raft cultures revealed differences in their ability to complete a squamous differentiation program compared with that of normal HEKs. The IEC-1 cells also exhibited a transitional phenotype with respect to replicative lifespan; HEKs had a lifespan of 4-6 passages, IEC-1 cells of 15-17 passages, and SCC cells were immortal. These alterations in IEC-1 cell behavior were not associated with functional inactivation or mutations of the p53 gene. These data indicate that the IEC-1 cells, derived from a preneoplastic skin tumor, exhibit differences in their ability to undergo terminal differentiation and have an extended replicative lifespan." @default.
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- W1982161722 date "2000-08-01" @default.
- W1982161722 modified "2023-10-14" @default.
- W1982161722 title "Functional Characterization of Cultured Cells Derived from an Intraepidermal Carcinoma of the Skin (IEC-1)" @default.
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- W1982161722 doi "https://doi.org/10.1006/excr.2000.4944" @default.
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