Evolving views of telomerase and cancer - PubMed (original) (raw)
Review
Evolving views of telomerase and cancer
Maria A Blasco et al. Trends Cell Biol. 2003 Jun.
Abstract
The maintenance of telomeres, nucleoprotein structures that constitute the ends of eukaryotic chromosomes, regulates many crucial cellular functions and might, in multicellular organisms, participate in the control of complex phenotypes such as aging and cancer. Stabilization of telomere length is strongly associated with cellular immortalization, and constitutive telomerase activation occurs in most human cancers. Such observations form the basis for the prevailing model that postulates that alterations in telomere biology both suppress and facilitate malignant transformation by regulating genomic stability and cell life span. However, recent findings suggest that telomere maintenance might not be an obligate requirement for initial tumor formation in some settings and that telomerase activation contributes to tumorigenesis independently of its role in maintaining telomere length. These recent developments indicate that our understanding of telomere biology remains incomplete and implicate additional complexity in the relationships among telomeres, telomerase and cancer.
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