Abstract
We directly compared two methods of immortalizing human mammary epithelial cells (HMECs). Cells were transfected with an expression plasmid either for hTERT, the catalytic subunit of telomerase, or for the simian virus 40 (SV40) early region genes. Under standard culture conditions, HMECs were not immortalized by hTERT unless they had spontaneously ceased expression of the p16INK4a tumor suppressor gene. Untransfected HMECs had low levels of telomerase expression, and immortalization by both methods was associated with an increase in telomerase activity and prevention of telomere shortening. SV40-induced immortalization was accompanied by aberrant differentiation, loss of DNA damage response, karyotypic instability and, in some cases, tumorigenicity. hTERT-immortalized cells had fewer karyotypic changes, but had intact DNA damage responses, and features of normal differentiation. Although SV40-immortalized cells are useful for studies of carcinogenesis, hTERT-immortalized cells retain more properties of normal cells.
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Acknowledgements
The research was supported by the National Breast Cancer Foundation, the National Health and Medical Research Council of Australia, the Carcinogenesis Fellowship of the New South Wales Cancer Council, and a Yass Memorial scholarship. The authors thank Christine Smyth for FACscan analysis, and CMRI Bioservices for nude mouse studies.
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Toouli, C., Huschtscha, L., Neumann, A. et al. Comparison of human mammary epithelial cells immortalized by simian virus 40 T-Antigen or by the telomerase catalytic subunit. Oncogene 21, 128–139 (2002). https://doi.org/10.1038/sj.onc.1205014
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DOI: https://doi.org/10.1038/sj.onc.1205014
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