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Ectopically hTERT expressing adult human mesenchymal stem cells are less radiosensitive than their telomerase negative counterpart

Lookup NU author(s): Dr Gabriele Saretzki

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Abstract

During the past several years increasing evidence indicating that the proliferation capacity of mammalian cells is highly radiosensitive, regardless of the species and the tissue of origin of the cells, has accumulated. It has also been shown that normal bone marrow cells of mice have a similar radiosensitivity to other mammalian cells so far tested. In this study, we investigated the genetic effects of ionizing radiation (2.5-15 Gy) on normal human mesenchymal stem cells and their telomerised counterpart hMSC-telo1. We evaluated overall genomic integrity, DNA damage/repair by applying a fluorescence-detected alkaline DNA unwinding assay together with Western blot analyses for phosphorylated H2AX and Q-FISH was applied for investigation of telomeric damage. Our results indicate that hMSC and TERT-immortalized hMSCs can cope with relatively high doses of γ-rays and that overall DNA repair is similar in the two cell lines. The telomeres were extensively destroyed after irradiation in both cell types suggesting that telomere caps are especially sensitive to radiation. The TERT-immortalized hMSCs showed higher stability at telomeric regions than primary hMSCs indicating that cells with long telomeres and high telomerase activity have the advantage of re-establishing the telomeric caps. © 2007 Elsevier Inc. All rights reserved.


Publication metadata

Author(s): Serakinci N, Christensen R, Graakjaer J, Cairney CJ, Keith WN, Alsner J, Saretzki G, Kolvraa S

Publication type: Article

Publication status: Published

Journal: Experimental Cell Research

Year: 2007

Volume: 313

Issue: 5

Pages: 1056-1067

ISSN (print): 0014-4827

ISSN (electronic): 1090-2422

Publisher: Academic Press

URL: http://dx.doi.org/10.1016/j.yexcr.2007.01.002

DOI: 10.1016/j.yexcr.2007.01.002

PubMed id: 17274981


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