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Cell Growth & Differentiation, Vol 7, Issue 1 21-30, Copyright © 1996 by American Association of Cancer Research


ARTICLES

Induction of HL-60 cells to undergo apoptosis is determined by high levels of wild-type p53 protein whereas differentiation of the cells is mediated by lower p53 levels

D Ronen, D Schwartz, Y Teitz, N Goldfinger and V Rotter
Department of Human Microbiology, Tel Aviv University, Ramat Aviv, Israel.

The observation that wild-type p53 may induce cells to undergo either apoptosis or differentiation raises the question of whether these two events share similar p53-dependent pathways. To evaluate the interrelationship between these two p53-dependent processes, our study focused on the human HL-60, a promyelocytic p53 nonproducer cell line in which p53 expression was introduced and the induction of apoptosis and differentiation was followed under controlled conditions. p53 expression was induced in the HL-60 cell line by infection with the recombinant wild-type p53 (p53WT) vaccinia virus. Viral infection gave rise to cells expressing various levels of wild-type p53 protein. High levels of p53 protein induced cells to undergo rapid apoptosis, whereas lower levels of p53 protein induced cells to undergo cell differentiation at a more moderate rate of kinetics. These results suggest that p53 protein levels may determine whether a given cell should prefer one pathway over the other to exit the cell cycle. Accordingly, we propose that the p53 vaccinia virus may be used as a potential vector for cell therapy leading toward the exit of p53 null human primary hematopoetic tumors from the malignant state in vivo via the apoptotic or cell differentiation pathways.


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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.