title: c-Jun N-terminal kinase mediates hydrogen peroxide-induced cell death via sustained poly(ADP-ribose) polymerase-1 activation.
abstract: Reactive oxygen species (ROS) have been closely associated with both apoptotic and non-apoptotic/necrotic cell death. Our previous study has illustrated that c-Jun-N-terminal kinase 1 (JNK1) is the main executor in hydrogen peroxide (H(2)O(2))-induced nonapoptotic cell death. The main objective of this study is to further elucidate the molecular mechanisms downstream of JNK1 in H(2)O(2)-induced cell death. In this study, poly(ADP-ribose) polymerase-1 (PARP-1), a key DNA repair protein, was readily activated by H(2)O(2) and inhibition of PARP-1 activation by either a pharmacological or genetic approach offered significant protection against H(2)O(2)-induced cell death. More importantly, H(2)O(2)-mediated PARP-1 activation is subject to regulation by JNK1. Suppression of JNK1 activation by a chemical inhibitor or genetic deletion markedly suppressed the late-phase PARP-1 activation induced by H(2)O(2), suggesting that JNK1 contributes to the sustained activation of PARP-1. Such findings were supported by the temporal pattern of nuclear translocation of activated JNK and a direct protein-protein interaction between JNK1 and PARP-1 in H(2)O(2)-treated cells. Finally, in vitro kinase assay suggests that PARP-1 may serve as the direct phosphorylation target for JNK1. Taken together, data from our study reveal a novel underlying mechanism in H(2)O(2)-induced nonapoptotic cell death: JNK1 promotes a sustained PARP-1 activation via nuclear translocation, protein-protein interaction and PARP-1 phosphorylation.
authors.affiliation: Department of Community, Occupational and Family Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Republic of Singapore.
authors.forename: S
authors.initials: S
authors.lastname: Zhang
authors.forename: Y
authors.initials: Y
authors.lastname: Lin
authors.forename: Y-S
authors.initials: YS
authors.lastname: Kim
authors.forename: M P
authors.initials: MP
authors.lastname: Hande
authors.forename: Z-G
authors.initials: ZG
authors.lastname: Liu
authors.forename: H-M
authors.initials: HM
authors.lastname: Shen
mesh_terms: D000255:Adenosine Triphosphate / Q000172:deficiency; D000818:Animals; D000873:Anthracenes / Q000494:pharmacology; D020169:Caspases / Q000378:metabolism; D016923:Cell Death / Q000187:drug effects; D002467:Cell Nucleus / Q000187:drug effects / Q000378:metabolism; D004622:Embryo, Mammalian / Q000166:cytology / Q000187:drug effects / Q000201:enzymology; D004789:Enzyme Activation / Q000187:drug effects; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects / Q000201:enzymology; D006801:Humans; D006861:Hydrogen Peroxide / Q000494:pharmacology*; D051379:Mice; D048055:Mitogen-Activated Protein Kinase 8 / Q000378:metabolism*; D010766:Phosphorylation / Q000187:drug effects; D011065:Poly(ADP-ribose) Polymerases / Q000378:metabolism*; D011485:Protein Binding / Q000187:drug effects; D021381:Protein Transport / Q000187:drug effects
chemical_list: D000873:Anthracenes; C432165:pyrazolanthrone; D000255:Adenosine Triphosphate; D006861:Hydrogen Peroxide; D011065:Poly(ADP-ribose) Polymerases; D048055:Mitogen-Activated Protein Kinase 8; D020169:Caspases