| Role of superoxide in poly(ADP-ribose) polymerase upregulation after transient cerebral ischemia. | |
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MedLine Citation:
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PMID: 12750003 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Oxidative stress plays a pivotal role in ischemic-reperfusion cell injury. Oxygen-derived free radicals trigger DNA strand damage, which is responsible for the activation of poly(ADP-ribose) polymerase (PARP). Recent studies have shown that peroxynitrite is the primary mediator of DNA damage and, hence, PARP activation after ischemia. PARP activation depletes NAD and ATP pools, ultimately resulting in necrotic cell death by loss of energy stores. Our study shows that PARP is upregulated as early as 15 min after 1 h of transient focal cerebral ischemia and remains for 8 h. We also examined the role of superoxide in PARP induction using copper/zinc-superoxide dismutase transgenic mice. Immunohistochemical and Western blotting data showed that there was no increased induction in PARP expression in these mice, suggesting that one of the mechanisms by which ischemic injury is attenuated in these mice might be by the inhibition of PARP induction. Furthermore, double staining of ischemic tissue with a PARP antibody and terminal deoxynucleotidyl transferase-mediated uridine 5'-triphosphate-biotin nick end labeling (TUNEL) indicated that most cells that are positive for TUNEL do not stain for the PARP antibody, confirming recent reports that PARP activation is involved in necrotic cell death rather than apoptosis during ischemic-reperfusion injury. |
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Authors:
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Purnima Narasimhan; Miki Fujimura; Nobuo Noshita; Pak H Chan |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Brain research. Molecular brain research Volume: 113 ISSN: 0169-328X ISO Abbreviation: Brain Res. Mol. Brain Res. Publication Date: 2003 May |
Date Detail:
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Created Date: 2003-05-16 Completed Date: 2003-08-18 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 8908640 Medline TA: Brain Res Mol Brain Res Country: Netherlands |
Other Details:
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Languages: eng Pagination: 28-36 Citation Subset: IM |
Affiliation:
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Department of Neurosurgery, Stanford University School of Medicine, CA 94305, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Cell Death / genetics* Cerebral Cortex / enzymology, pathology, physiopathology Cytochrome c Group / metabolism Immunohistochemistry Ischemic Attack, Transient / enzymology*, genetics Male Mice Mice, Transgenic Nerve Degeneration / enzymology*, genetics Oxidative Stress / genetics* Poly(ADP-ribose) Polymerases Proteins / metabolism* Superoxide Dismutase / genetics, metabolism Superoxides / metabolism* Up-Regulation / genetics* |
| Grant Support | |
ID/Acronym/Agency:
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NS 25372/NS/NINDS NIH HHS; NS 36147/NS/NINDS NIH HHS; NS 38653/NS/NINDS NIH HHS; P50 NS 14534/NS/NINDS NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Cytochrome c Group; 0/Proteins; 11062-77-4/Superoxides; EC 1.15.1.-/superoxide dismutase 1; EC 1.15.1.1/Superoxide Dismutase; EC 2.4.2.30/Parp1 protein, mouse; EC 2.4.2.30/Poly(ADP-ribose) Polymerases |
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