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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Firpo, Eduardo J. Wang, Yang Roberts, James M. Mukherjee, Shibani |
| Description | Author Affiliation: Mukherjee S ( Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.); |
| Abstract | The canonical function of the human telomerase protein (hTERT) is to synthesize telomeric DNA, but it has other biological activities, including enhancing cell proliferation, decreasing apoptosis, regulating DNA damage responses, and increasing cellular proliferative lifespan. The mechanistic relationships among these activities are not understood. We previously demonstrated that ectopic hTERT expression in primary human mammary epithelial cells diminishes their requirement for exogenous mitogens, thus giving them a proliferative advantage in a mitogen-depleted environment. Here, we show that this phenotype is caused by a combination of increased cell division and decreased apoptosis. In addition, we use a panel of hTERT mutants to demonstrate that this enhanced cell proliferation can be uncoupled not only from telomere elongation, but also from other telomerase activities, including cellular lifespan extension and regulation of DNA damage responses. We also find that the proliferative function of hTERT, which requires hTERT catalytic activity, is not caused by increased Wnt signaling, but is accompanied by alterations in key cell cycle regulators and is linked to an hTERT-catalyzed decrease in the levels of the RNA component of mitochondrial RNA processing endoribonuclease. Thus, enhanced cell proliferation is an independent function of hTERT that could provide a new target for the development of anti-telomerase cancer therapeutic agents. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 50 |
| Volume Number | 108 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2011-12-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Reverse Genetics Telomerase Genetics Metabolism Animals Biocatalysis Drug Effects Breast Cytology Cell Aging Cell Division Cell Proliferation Cell Survival Chromosomal Instability DNA Damage Endoribonucleases Epithelial Cells Enzymology Mice Mitogens Pharmacology Telomere Wnt Signaling Pathway Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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