title: Roles of NF-kappaB and bcl-2 in two differential modes of cell death of mouse cortical collecting duct cells.
abstract: Recent data have implicated nuclear factor-kappaB (NF-kappaB) and Bcl-2 in the regulation of apoptotic and necrotic cell death in various cells. However, mechanisms of their effects on cell death of renal epithelial cells are not clear. First, we investigated the effect of specific inhibition of NF-kappaB and overexpression of Bcl-2 on necrotic cell death induced by hydrogen peroxide or cisplatin in renal collecting duct cells. M-1 cells, which were derived from outer cortical collecting duct, were stably transfected with the non-phosphorylatable mutant of inhibitory-kappaBalpha (I-kappaBalpha) and Bcl-2. Overexpression of I-kappaBalpha and Bcl-2 did not affect cisplatin-induced necrotic cell death, but overexpression of I-kappaBalpha significantly decreased H2O2-induced cell death. Regarding apoptotic cell death induced by cisplatin, serum deprivation and contact inhibition was increased by overexpression of I-kappaBalpha, whereas overexpression of bcl-2 inhibited the apoptotic cell death. I-kappaBalpha overexpression increased Bax expression and decreased cIAP-1 and -2 expression compared to vector-transfected cells, but did not alter SAPK/JNK activity in the presence or absence of cisplatin. NF-kappaB activity was significantly higher in bcl-2-overexpressing cells than in control cells. These data show that activation of NF-kappaB mediates H2O2-induced necrotic injury, but inhibits apoptotic cell death in renal collecting duct cells, and that Bcl-2 selectively protects apoptotic cell death in M-1 cells.
authors.affiliation: Department of Physiology, College of Medicine, Pusan National University, Busan, Korea.
authors.forename: J M
authors.initials: JM
authors.lastname: Song
authors.forename: R H
authors.initials: RH
authors.lastname: Lee
authors.forename: J S
authors.initials: JS
authors.lastname: Jung
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology; D017209:Apoptosis / Q000187:drug effects / Q000502:physiology*; D002478:Cells, Cultured; D002945:Cisplatin / Q000494:pharmacology; D045304:Cytochromes c / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000494:pharmacology; D020672:I-kappa B Proteins / Q000235:genetics / Q000378:metabolism; D051034:Inhibitor of Apoptosis Proteins; D048031:JNK Mitogen-Activated Protein Kinases / Q000378:metabolism; D007685:Kidney Tubules, Collecting / Q000166:cytology* / Q000378:metabolism*; D008564:Membrane Potentials / Q000502:physiology; D051379:Mice; D008822:Mice, Transgenic; D008928:Mitochondria / Q000502:physiology; D000072000:NF-KappaB Inhibitor alpha; D016328:NF-kappa B / Q000378:metabolism*; D009336:Necrosis; D016877:Oxidants / Q000494:pharmacology; D011506:Proteins / Q000378:metabolism; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology; D051028:bcl-2-Associated X Protein
chemical_list: D000970:Antineoplastic Agents; C494827:Bax protein, mouse; D020672:I-kappa B Proteins; D051034:Inhibitor of Apoptosis Proteins; D016328:NF-kappa B; C000606205:Nfkbia protein, mouse; D016877:Oxidants; D011506:Proteins; D019253:Proto-Oncogene Proteins c-bcl-2; D051028:bcl-2-Associated X Protein; D000072000:NF-KappaB Inhibitor alpha; D045304:Cytochromes c; D006861:Hydrogen Peroxide; D048031:JNK Mitogen-Activated Protein Kinases; D002945:Cisplatin