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Enforced Expression of p14ARF Induces p53-Dependent Cell Cycle Arrest but Not Apoptosis
Stuart Gallagher, Richard F. Kefford and Helen Rizos
volume 4 | issue 3
march 2005Pages: 465 - 472
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Expression of the p14ARF tumour suppressor is induced by hyperproliferative signals produced by RAS, MYC and other oncogenes. p14ARF quenches inappropriate mitogenic signaling by activating the p53 pathway, and the frequent loss of p14ARF in human cancer diminishes the duration and level of the p53 response. Consistent with this role, p14ARF accumulation can induce potent cell cycle arrest, but its role in promoting apoptosis has not been well established. Therefore we investigated the effects of p14ARF on the survival and growth of several human cell types. To avoid the toxicity associated with adenoviral-based vectors, we established inducible expression of p14ARF in p53-intact and p53-deficient human cell lines. As expected, transient and inducible expression of p14ARF induced rapid cell cycle arrest only in tumour cells expressing intact p53. Further, p14ARF expression did not promote apoptosis in primary human fibroblasts, or in any human tumour cell line tested, irrespective of p53 status. Instead, p14ARF expression sensitized cells to apoptosis in the presence of inhibitors of topoisomerase II (adriamycin) and transcription (DRB). Thus, loss of p14ARF would be an important step in the selection of apoptotic resistant tumour cells.
We now provide open access to journal articles published online for one year or more. This article may be downloaded at the following link:
Download PDF If the document does not open, please right-click on the link (control-click on a Macintosh) and select the option to save the file to disk.