Abstract
Many degenerative diseases that occur with aging, as well as premature aging syndromes, are characterized by presenting cells with critically short telomeres. Telomerase reintroduction is envisioned as a putative therapy for diseases characterized by telomere exhaustion. K5-mTert transgenic mice overexpress telomerase in a wide spectrum of tissues. These mice have a higher incidence of both induced and spontaneous tumors, resulting in increased mortality during the first year of life. Here, we show that in spite of this elevated tumor incidence and the initial lower survival, K5-mTert mice show an extension of the maximum lifespan from 1.5 to 3 months, depending on the transgenic line, which represents up to a 10% increase in the mean lifespan compared to wild-type littermates. This longer lifespan is coincidental with a lower incidence of certain age-related degenerative diseases, mainly those related to kidney function and germline integrity. Importantly, these effects of telomerase overexpression cannot be attributed to dramatic differences in telomere length in aged K5-Tert mice compared to wild-type mice, as shown by quantitative telomeric FISH. These findings indicate that telomerase overexpression extends the maximum lifespan of mice.
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Acknowledgements
We are indebted to Rosa Serrano, Elisa Santos, and Jessica Freire for mouse care and genotyping. We thank Todd Devries for statistical calculations and discussion, and Susa Alcamí for proofreading of the manuscript. EG-S is a predoctoral fellow of the Fondo de Investigaciones Sanitarias (FIS). CG is supported by a Marie Curie Fellowship within the 6th EU Framework Programme. MAB laboratory is funded by The Swiss Bridge Cancer Research Award 2000, by The Josef Steiner Cancer Research Award 2003, by grants GEN20014856C1308 and SAF20011869 from Ministry of Science and Technology of Spain, by grant 08.1/0054/01 from the CAM, by EU grants FIGHCT199900009, FIGHCT199900002, QLG1199901341, FIS5200200078, and by the Department of Immunology and Oncology.
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González-Suárez, E., Geserick, C., Flores, J. et al. Antagonistic effects of telomerase on cancer and aging in K5-mTert transgenic mice. Oncogene 24, 2256–2270 (2005). https://doi.org/10.1038/sj.onc.1208413
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DOI: https://doi.org/10.1038/sj.onc.1208413
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