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Title: Altered poly(ADP-ribose) metabolism impairs cellular responses to genotoxic stress in a hypomorphic mutant of poly(ADP-ribose) glycohydrolase

Abstract

Genotoxic stress activates nuclear poly(ADP-ribose) (PAR) metabolism leading to PAR synthesis catalyzed by DNA damage activated poly(ADP-ribose) polymerases (PARPs) and rapid PAR turnover by action of nuclear poly(ADP-ribose) glycohydrolase (PARG). The involvement of PARP-1 and PARP-2 in responses to DNA damage has been well studied but the involvement of nuclear PARG is less well understood. To gain insights into the function of nuclear PARG in DNA damage responses, we have quantitatively studied PAR metabolism in cells derived from a hypomorphic mutant mouse model in which exons 2 and 3 of the PARG gene have been deleted (PARG-{delta}2,3 cells), resulting in a nuclear PARG containing a catalytic domain but lacking the N-terminal region (A domain) of the protein. Following DNA damage induced by N-methyl-N'-nitro-N-nitrosoguanidine (MNNG), we found that the activity of both PARG and PARPs in intact cells is increased in PARG-{delta}2,3 cells. The increased PARG activity leads to decreased PARP-1 automodification with resulting increased PARP activity. The degree of PARG activation is greater than PARP, resulting in decreased PAR accumulation. Following MNNG treatment, PARG-{delta}2,3 cells show reduced formation of XRCC1 foci, delayed H2AX phosphorylation, decreased DNA break intermediates during repair, and increased cell death. Our results show that a precisemore » coordination of PARPs and PARG activities is important for normal cellular responses to DNA damage and that this coordination is defective in the absence of the PARG A domain.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [3]
  1. Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Room 3985 Arizona Cancer Center, 1515 North Campbell Avenue, Tucson, AZ 85724 (United States)
  2. International Agency for Research on Cancer, 69008 Lyon (France)
  3. Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Room 3985 Arizona Cancer Center, 1515 North Campbell Avenue, Tucson, AZ 85724 (United States). E-mail: mjacobson@pharmacy.arizona.edu
Publication Date:
OSTI Identifier:
20972130
Resource Type:
Journal Article
Resource Relation:
Journal Name: Experimental Cell Research; Journal Volume: 313; Journal Issue: 5; Other Information: DOI: 10.1016/j.yexcr.2006.12.025; PII: S0014-4827(06)00525-8; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
60 APPLIED LIFE SCIENCES; ADP; APOPTOSIS; BIOLOGICAL STRESS; DNA DAMAGES; METABOLISM; MICE; MUTANTS; NAD; NADP; PHOSPHORYLATION; POLYMERASES; RIBOSE

Citation Formats

Gao Hong, Coyle, Donna L., Meyer-Ficca, Mirella L., Meyer, Ralph G., Jacobson, Elaine L., Wang, Zhao-Qi, and Jacobson, Myron K. Altered poly(ADP-ribose) metabolism impairs cellular responses to genotoxic stress in a hypomorphic mutant of poly(ADP-ribose) glycohydrolase. United States: N. p., 2007. Web.
Gao Hong, Coyle, Donna L., Meyer-Ficca, Mirella L., Meyer, Ralph G., Jacobson, Elaine L., Wang, Zhao-Qi, & Jacobson, Myron K. Altered poly(ADP-ribose) metabolism impairs cellular responses to genotoxic stress in a hypomorphic mutant of poly(ADP-ribose) glycohydrolase. United States.
Gao Hong, Coyle, Donna L., Meyer-Ficca, Mirella L., Meyer, Ralph G., Jacobson, Elaine L., Wang, Zhao-Qi, and Jacobson, Myron K. Sat . "Altered poly(ADP-ribose) metabolism impairs cellular responses to genotoxic stress in a hypomorphic mutant of poly(ADP-ribose) glycohydrolase". United States. doi:.
@article{osti_20972130,
title = {Altered poly(ADP-ribose) metabolism impairs cellular responses to genotoxic stress in a hypomorphic mutant of poly(ADP-ribose) glycohydrolase},
author = {Gao Hong and Coyle, Donna L. and Meyer-Ficca, Mirella L. and Meyer, Ralph G. and Jacobson, Elaine L. and Wang, Zhao-Qi and Jacobson, Myron K.},
abstractNote = {Genotoxic stress activates nuclear poly(ADP-ribose) (PAR) metabolism leading to PAR synthesis catalyzed by DNA damage activated poly(ADP-ribose) polymerases (PARPs) and rapid PAR turnover by action of nuclear poly(ADP-ribose) glycohydrolase (PARG). The involvement of PARP-1 and PARP-2 in responses to DNA damage has been well studied but the involvement of nuclear PARG is less well understood. To gain insights into the function of nuclear PARG in DNA damage responses, we have quantitatively studied PAR metabolism in cells derived from a hypomorphic mutant mouse model in which exons 2 and 3 of the PARG gene have been deleted (PARG-{delta}2,3 cells), resulting in a nuclear PARG containing a catalytic domain but lacking the N-terminal region (A domain) of the protein. Following DNA damage induced by N-methyl-N'-nitro-N-nitrosoguanidine (MNNG), we found that the activity of both PARG and PARPs in intact cells is increased in PARG-{delta}2,3 cells. The increased PARG activity leads to decreased PARP-1 automodification with resulting increased PARP activity. The degree of PARG activation is greater than PARP, resulting in decreased PAR accumulation. Following MNNG treatment, PARG-{delta}2,3 cells show reduced formation of XRCC1 foci, delayed H2AX phosphorylation, decreased DNA break intermediates during repair, and increased cell death. Our results show that a precise coordination of PARPs and PARG activities is important for normal cellular responses to DNA damage and that this coordination is defective in the absence of the PARG A domain.},
doi = {},
journal = {Experimental Cell Research},
number = 5,
volume = 313,
place = {United States},
year = {Sat Mar 10 00:00:00 EST 2007},
month = {Sat Mar 10 00:00:00 EST 2007}
}