Efficient induction of cell death by adenoviruses requires binding of E1B55k and p53

The use of an Elb55k-deficient adenovirus, ONYX-015, to selectively target tumor cells containing a mutated p53 gene has produced promising results. However, recent reports have questioned the selectivity of this virus, showing that ONYX-015 can replicate in cells containing a wild-type p53 and that...

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Veröffentlicht in:Cancer research (Chicago, Ill.) Ill.), 2000-05, Vol.60 (10), p.2666-2672
Hauptverfasser: DIX, B. R, O'CARROLL, S. J, MYERS, C. J, EDWARDS, S. J, BRAITHWAITE, A. W
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container_issue 10
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container_title Cancer research (Chicago, Ill.)
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creator DIX, B. R
O'CARROLL, S. J
MYERS, C. J
EDWARDS, S. J
BRAITHWAITE, A. W
description The use of an Elb55k-deficient adenovirus, ONYX-015, to selectively target tumor cells containing a mutated p53 gene has produced promising results. However, recent reports have questioned the selectivity of this virus, showing that ONYX-015 can replicate in cells containing a wild-type p53 and that p53 may actually be required for cell death. To address these apparent contradictions in the literature, we infected a number of mutant and wild-type p53-containing cell lines with ONYX-015 and wild-type adenovirus and observed their death profiles up to 10 days postinfection. We demonstrate that two distinct cell death phenotypes exist, one of which is rapid and dependent on the presence of p53 and one of which is p53 independent. Using adenoviruses expressing E1b55k proteins deficient in their ability to bind p53, we show that formation of a complex between p53 and the adenoviral Elb55k protein is necessary for the activation of the rapid cell death pathway. In the absence of p53 or the absence of complex formation between p53 and Elb55k, cell death is delayed considerably. These data suggest three things: that the selectivity of killing appears to be dependent on the presence of the E1b55k/p53 complex; that viruses lacking Elb55k (such as ONYX-015) kill cells in a delayed manner independent of p53; and that binding of E1b55k to p53 does not merely serve to inactivate p53, but rather is required for the induction of rapid cell death. The components of this complex that lead to rapid cell death remain to be determined.
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Using adenoviruses expressing E1b55k proteins deficient in their ability to bind p53, we show that formation of a complex between p53 and the adenoviral Elb55k protein is necessary for the activation of the rapid cell death pathway. In the absence of p53 or the absence of complex formation between p53 and Elb55k, cell death is delayed considerably. These data suggest three things: that the selectivity of killing appears to be dependent on the presence of the E1b55k/p53 complex; that viruses lacking Elb55k (such as ONYX-015) kill cells in a delayed manner independent of p53; and that binding of E1b55k to p53 does not merely serve to inactivate p53, but rather is required for the induction of rapid cell death. 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subjects Adenoviridae
Adenovirus
Adenovirus E1B Proteins - metabolism
Ageing, cell death
Apoptosis
Biological and medical sciences
Cell Count
Cell Cycle
Cell Line
Cell physiology
E1B55k protein
Fundamental and applied biological sciences. Psychology
Humans
Molecular and cellular biology
p53 gene
p53 protein
Phenotype
Tumor Cells, Cultured
Tumor Suppressor Protein p53 - metabolism
title Efficient induction of cell death by adenoviruses requires binding of E1B55k and p53
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