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Cell Growth & Differentiation, Vol 7, Issue 12 1643-1650, Copyright © 1996 by American Association of Cancer Research


ARTICLES

Expression of p53 in Saos-2 osteosarcoma cells induces apoptosis which can be inhibited by Bcl-2 or the adenovirus E1B-55 kDa protein

RC Marcellus, JG Teodoro, R Charbonneau, GC Shore and PE Branton
Department of Biochemistry, McGill University, Montreal, Quebec, Canada.

Studies were carried out to determine the effects of introducing p53 using an adenovirus gene transfer vector into p53 null human Saos-2 osteogenic carcinoma cells. Expression of p53 led to cell death within 30-40 h. The morphology of these cells as determined by electron microscopy indicated that death was by apoptosis. Such death was significantly reduced in Saos-2 variants that express high levels of the Bcl-2 suppressor of apoptosis. It was also found that the E1B-55 kDa protein of human adenovirus type 5, which was known to bind and inactivate p53, blocks Saos-2 cell death following expression of p53. These results thus directly demonstrate that this viral protein is able to inhibit p53-induced apoptosis.


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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1996 by the American Association of Cancer Research.