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Current Molecular Medicine

Editor-in-Chief

ISSN (Print): 1566-5240
ISSN (Online): 1875-5666

Telomere Induced Senescence: End Game Signaling

Author(s): Aram F. Hezel, Nabeel Bardeesy and Richard S. Maser

Volume 5, Issue 2, 2005

Page: [145 - 152] Pages: 8

DOI: 10.2174/1566524053586563

Price: $65

Abstract

The telomere-based model of cell aging has proven to among been among the most enduring hypotheses in cell biology. This model, suggesting that the gradual loss of telomere sequences during the proliferation of cultured human somatic cells imposes a barrier on cellular replicative potential, has been strongly supported by recent genetic and biochemical studies. In addition, evidence implicating telomere dynamics in organismal ageing and cancer progression in vivo suggest that such a process is likely to have considerable physiological relevance in homeostasis and disease. What is the sensing mechanism for shortened telomeres and what is the molecular basis for the ensuing checkpoint response? Moreover, what is the outcome when such failsafe mechanisms are lost? Here we will review the signaling pathways that are induced by alterations in telomere length and integrity and illustrate how these processes provoke downstream effects on cell proliferation and survival. In addition, we discuss how the telomere-induced pathways intersect with the DNA damage response and document how the failure in either process results in unrestrained chromosomal instability.

Keywords: telomeres, telomerase, senescence, genomic instability


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