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Apoptosis of mortal human fibroblasts transformed by the bovine papillomavirus E5 oncoprotein. | LitMetric

Apoptosis of mortal human fibroblasts transformed by the bovine papillomavirus E5 oncoprotein.

Mol Cancer Res

Center for Immunology and Microbial Disease, Albany Medical College, Albany, NY 12208, USA.

Published: December 2002

AI Article Synopsis

Article Abstract

Mortal human fibroblasts can be partially transformed by the bovine papillomavirus E5 oncoprotein through activation of the platelet-derived growth factor beta receptor. Here, we report that these cells undergo massive apoptosis 2 weeks after confluence. Although activation of caspase 3 was observed in the apoptotic cells, it was not required for apoptosis. The appearance of the mitochondrial proteins cytochrome c and apoptosis-inducing factor in cytosolic and nuclear compartments, respectively, provided a basis for mitochondrial dysfunction and a caspase-independent mechanism of apoptosis in these cells. Although an activating conformational change in Bax also was evident in the apoptotic cells, enforced overexpression of Bcl-2 was insufficient to prevent apoptosis. Finally, a small peptide present in the conditioned medium from dying transformed cells appeared responsible for inducing apoptosis through affecting a conformational change in Bax and eventual relocalization of apoptosis-inducing factor to the nucleus. Thus, an atypical apoptotic pathway is activated in mortal human fibroblasts in response to transformation induced by sustained receptor tyrosine kinase activation.

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