title: Essential roles of receptor-interacting protein and TRAF2 in oxidative stress-induced cell death.
abstract: Oxidative stress and reactive oxygen species (ROS) can elicit and modulate various physiological and pathological processes, including cell death. However, the mechanisms controlling ROS-induced cell death are largely unknown. Data from this study suggest that receptor-interacting protein (RIP) and tumor necrosis factor receptor (TNFR)-associated factor 2 (TRAF2), two key effector molecules of TNF signaling, are essential for ROS-induced cell death. We found that RIP(-/-) or TRAF2(-/-) mouse embryonic fibroblasts (MEF) are resistant to ROS-induced cell death when compared to wild-type cells, and reconstitution of RIP and TRAF2 gene expression in their respective deficient MEF cells restored their sensitivity to H(2)O(2)-induced cell death. We also found that RIP and TRAF2 form a complex upon H(2)O(2) exposure, but without the participation of TNFR1. The colocalization of RIP with a membrane lipid raft marker revealed a possible role of lipid rafts in the transduction of cell death signal initiated by H(2)O(2). Finally, our results demonstrate that activation of c-Jun NH(2)-terminal kinase 1 is a critical event downstream of RIP and TRAF2 in mediating ROS-induced cell death. Therefore, our study uncovers a novel signaling pathway regulating oxidative stress-induced cell death.
authors.affiliation: Cell and Cancer Biology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892, USA.
authors.forename: Han-Ming
authors.initials: HM
authors.lastname: Shen
authors.forename: Yong
authors.initials: Y
authors.lastname: Lin
authors.forename: Swati
authors.initials: S
authors.lastname: Choksi
authors.forename: Jamie
authors.initials: J
authors.lastname: Tran
authors.forename: Tian
authors.initials: T
authors.lastname: Jin
authors.forename: Lufen
authors.initials: L
authors.lastname: Chang
authors.forename: Michael
authors.initials: M
authors.lastname: Karin
authors.forename: Jianke
authors.initials: J
authors.lastname: Zhang
authors.forename: Zheng-gang
authors.initials: ZG
authors.lastname: Liu
mesh_terms: D000818:Animals; D016923:Cell Death; D002460:Cell Line; D006801:Humans; D006861:Hydrogen Peroxide / Q000494:pharmacology; D019169:Jurkat Cells; D051379:Mice; D048055:Mitogen-Activated Protein Kinase 8; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D018384:Oxidative Stress; D011485:Protein Binding / Q000187:drug effects; D011506:Proteins / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D017382:Reactive Oxygen Species / Q000494:pharmacology; D053422:Receptor-Interacting Protein Serine-Threonine Kinases; D015398:Signal Transduction; D047992:TNF Receptor-Associated Factor 2; D014162:Transfection
chemical_list: D011506:Proteins; D017382:Reactive Oxygen Species; D047992:TNF Receptor-Associated Factor 2; D006861:Hydrogen Peroxide; C506249:RIPK1 protein, human; D053422:Receptor-Interacting Protein Serine-Threonine Kinases; C506251:Ripk1 protein, mouse; D048055:Mitogen-Activated Protein Kinase 8; D020928:Mitogen-Activated Protein Kinases