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Lookup NU author(s): Professor Thomas von Zglinicki,
Dr Gabriele Saretzki,
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It has been established that telomere-dependent replicative senescence of human fibroblasts is stress-dependent. First, it was shown that telomere-shortening, which is a major contributor to telomere uncapping, is stress-dependent to a significant degree. Second, the signalling pathway connecting telomere uncapping and replicative senescence appears to be the same as the one that is activated by DNA damage: uncapped telomeres activate signalling cascades involving the protein kinases ATM, ATR and, possibly, DNA-PK. Furthermore, phosphorylation of historic H2A,X facilitates the formation of DNA damage foci around uncapped telomeres, and this in turn activates downstream kinases Chk1 and Chk2 and, eventually, p53. It appears that this signalling pathway has to be maintained in order to keep cells in a senescent state. Thus, cellular senescence can be regarded as a permanently maintained DNA damage response state. This suggests that antibodies against DNA damage foci components might be useful markers for senescent cells in vivo. (C) 2004 Elsevier Ireland Ltd. All rights reserved.
Author(s): von Zglinicki T, Saretzki G, Ladhoff J, di Fagagna FD, Jackson SP
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: Mechanisms of Ageing and Development: 2nd International Conference on Functional Genomics of Ageing
Year of Conference: 2005
Publisher: Elsevier Ireland Ltd
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