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Molecular and Cellular Biology, September 2000, p. 6695-6703, Vol. 20, No. 18
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
DNA Excision Repair and DNA Damage-Induced
Apoptosis Are Linked to Poly(ADP-Ribosyl)ation but Have Different
Requirements for p53
Ralph
Beneke,1
Christoph
Geisen,1
Branko
Zevnik,1
Thomas
Bauch,2
Wolfgang-Ulrich
Müller,2
Jan-Heiner
Küpper,3 and
Tarik
Möröy1,*
Institut für Zellbiologie
(Tumorforschung), IFZ,1 and Institut
für Medizinische Strahlenbiologie,2
Universitätsklinikum Essen, D-45122 Essen, and Institut
für Pathologie, Universitätsklinikum Tübingen,
D-72076 Tübingen,3 Germany
Received 17 April 2000/Returned for modification 1 June
2000/Accepted 9 June 2000
Poly(ADP-ribose) polymerase (PARP) is a DNA binding zinc finger
protein that catalyzes the transfer of ADP-ribose residues from
NAD+ to itself and different chromatin constituents,
forming branched ADP-ribose polymers. The enzymatic activity of PARP is
induced upon DNA damage and the PARP protein is cleaved during
apoptosis, which suggested a role of PARP in DNA repair and DNA
damage-induced cell death. We have generated transgenic mice that lack
PARP activity in thymocytes owing to the targeted expression of a
dominant negative form of PARP. In the presence of single-strand DNA
breaks, the absence of PARP activity correlated with a strongly
increased rate of apoptosis compared to cells with intact PARP
activity. We found that blockage of PARP activity leads to a drastic
increase of p53 expression and activity after DNA damage and correlates with an accelerated onset of Bax expression. DNA repair is almost completely blocked in PARP-deficient thymocytes regardless of p53
status. We found the same increased susceptibility to apoptosis in PARP
null mice, a similar inhibition of DNA repair kinetics, and the same
upregulation of p53 in response to DNA damage. Thus, based on two
different experimental in vivo models, we identify a direct,
p53-independent, functional connection between poly(ADP-ribosyl)ation and the DNA excision repair machinery. Furthermore, we propose a
p53-dependent link between PARP activity and DNA damage-induced cell death.
*
Corresponding author. Mailing address: Institut
für Zellbiologie (Tumorforschung), IFZ,
Universitätsklinikum Essen, Virchowstrasse 173, D-45122 Essen,
Germany. Phone: 49 (201) 723-3380. Fax: 49 (201) 723-5904. E-mail:
moeroey{at}uni-essen.de.
Molecular and Cellular Biology, September 2000, p. 6695-6703, Vol. 20, No. 18
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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