title: BGP-15, a nicotinic amidoxime derivate protecting heart from ischemia reperfusion injury through modulation of poly(ADP-ribose) polymerase.
abstract: The protective effect of O-(3-piperidino-2-hydroxy-1-propyl)nicotinic amidoxime (BGP-15) against ischemia-reperfusion-induced injury was studied in the Langendorff heart perfusion system. To understand the molecular mechanism of the cardioprotection, the effect of BGP-15 on ischemic-reperfusion-induced reactive oxygen species (ROS) formation, lipid peroxidation single-strand DNA break formation, NAD(+) catabolism, and endogenous ADP-ribosylation reactions were investigated. These studies showed that BGP-15 significantly decreased leakage of lactate dehydrogenase, creatine kinase, and aspartate aminotransferase in reperfused hearts, and reduced the rate of NAD(+) catabolism. In addition, BGP-15 dramatically decreased the ischemia-reperfusion-induced self-ADP-ribosylation of nuclear poly(ADP-ribose) polymerase(PARP) and the mono-ADP-ribosylation of an endoplasmic reticulum chaperone GRP78. These data raise the possibility that BGP-15 may have a direct inhibitory effect on PARP. This hypothesis was tested on isolated enzyme, and kinetic analysis showed a mixed-type (noncompetitive) inhibition with a K(i) = 57 +/- 6 microM. Furthermore, BGP-15 decreased levels of ROS, lipid peroxidation, and single-strand DNA breaks in reperfused hearts. These data suggest that PARP may be an important molecular target of BGP-15 and that BGP-15 decreases ROS levels and cell injury during ischemia-reperfusion in the heart by inhibiting PARP activity.
authors.affiliation: Department of Biochemistry, University Medical School Pecs, Pecs, Hungary.
authors.forename: E
authors.initials: E
authors.lastname: Szabados
authors.forename: P
authors.initials: P
authors.lastname: Literati-Nagy
authors.forename: B
authors.initials: B
authors.lastname: Farkas
authors.forename: B
authors.initials: B
authors.lastname: Sumegi
mesh_terms: D036002:ADP Ribose Transferases; D000244:Adenosine Diphosphate / Q000378:metabolism; D000818:Animals; D002352:Carrier Proteins / Q000378:metabolism; D002467:Cell Nucleus / Q000378:metabolism; D003593:Cytoplasm / Q000201:enzymology / Q000378:metabolism; D004249:DNA Damage; D000091342:Endoplasmic Reticulum Chaperone BiP; D006360:Heat-Shock Proteins; D066298:In Vitro Techniques; D015227:Lipid Peroxidation; D008297:Male; D018832:Molecular Chaperones / Q000378:metabolism; D009243:NAD / Q000378:metabolism; D010091:Oximes / Q000627:therapeutic use*; D010477:Perfusion; D010880:Piperidines / Q000627:therapeutic use*; D000071137:Poly (ADP-Ribose) Polymerase-1; D000067856:Poly(ADP-ribose) Polymerase Inhibitors; D011065:Poly(ADP-ribose) Polymerases / Q000378:metabolism*; D020011:Protective Agents / Q000627:therapeutic use*; D011506:Proteins / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D017382:Reactive Oxygen Species / Q000378:metabolism; D015427:Reperfusion Injury / Q000201:enzymology / Q000517:prevention & control*
chemical_list: D002352:Carrier Proteins; D000091342:Endoplasmic Reticulum Chaperone BiP; D006360:Heat-Shock Proteins; D018832:Molecular Chaperones; D010091:Oximes; D010880:Piperidines; D000067856:Poly(ADP-ribose) Polymerase Inhibitors; D020011:Protective Agents; D011506:Proteins; D017382:Reactive Oxygen Species; D009243:NAD; D000244:Adenosine Diphosphate; D036002:ADP Ribose Transferases; C499322:Parp1 protein, rat; D000071137:Poly (ADP-Ribose) Polymerase-1; D011065:Poly(ADP-ribose) Polymerases; C405586:BGP 15