title: Poly(ADP-ribose) metabolism in brain and its role in ischemia pathology.
abstract: The biological roles of poly(ADP-ribose) polymers (PAR) and poly(ADP-ribosyl)ation of proteins in the central nervous system are diverse. The homeostasis of PAR orchestrated by poly(ADP-ribose) polymerase-1 (PARP-1) and poly(ADP-ribose) glycohydrolase (PARG) is crucial for cell physiology and pathology. Both enzymes are ubiquitously distributed in neurons and glia; however, they are segregated at the subcellular level. PARP-1 serves as a "nick sensor" for single- or double-stranded breaks in DNA and is involved in long and short patch base-excision repair, while PARG breaks down PAR. The stimulation of PARP-1 and PAR formation can activate proinflammatory transcription factors, including nuclear factor kappa B. However, hyperactivation of PARP-1 can result in depletion of NAD/ATP, and in PAR-dependent mitochondrial pore formation leading to release of apoptosis inducing factor and cell death. The role of PAR as a death signaling molecule in brain ischemia-reperfusion and inflammation as well as the effect of gender and aging is presented in this review. Modulating the PAR level through pharmacological or genetic intervention on PARP-1/PARG activity and gene expression should be a valuable way for neuroprotective strategy.
authors.affiliation: Department of Neurosurgery, Mossakowski Medical Research Centre, Polish Academy of Sciences, 5 Pawinskiego St., 02-106, Warsaw, Poland. roberts@cmdik.pan.pl
authors.forename: Robert Piotr
authors.initials: RP
authors.lastname: Strosznajder
authors.forename: Kinga
authors.initials: K
authors.lastname: Czubowicz
authors.forename: Henryk
authors.initials: H
authors.lastname: Jesko
authors.forename: Joanna Benigna
authors.initials: JB
authors.lastname: Strosznajder
mesh_terms: D000375:Aging / Q000502:physiology; D000818:Animals; D001921:Brain / Q000378:metabolism* / Q000473:pathology*; D002545:Brain Ischemia / Q000378:metabolism* / Q000473:pathology*; D006026:Glycoside Hydrolases / Q000378:metabolism; D006801:Humans; D008928:Mitochondria / Q000378:metabolism; D000071137:Poly (ADP-Ribose) Polymerase-1; D011064:Poly Adenosine Diphosphate Ribose / Q000378:metabolism*; D011065:Poly(ADP-ribose) Polymerases / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism; D015398:Signal Transduction / Q000502:physiology
chemical_list: D017382:Reactive Oxygen Species; D011064:Poly Adenosine Diphosphate Ribose; C499320:PARP1 protein, human; D000071137:Poly (ADP-Ribose) Polymerase-1; D011065:Poly(ADP-ribose) Polymerases; D006026:Glycoside Hydrolases; C022407:poly ADP-ribose glycohydrolase
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