Abstract
6-Hydroxydopamine (6-OHDA) is widely used to study the death of catecholaminergic cells related to Parkinson’s disease. Oxidative stress and gene transcription are known to mediate the pro-apoptotic effect of 6-OHDA. As redox mechanisms are involved in activation of the transcription factor NF-κB, we studied the role of NF-κB in 6-OHDA-induced death of PC12 cells.
We stably transfected PC12 cells with a doxycycline-regulated expression vector for the NF-κB super-repressor (IκBα mutated at serine-32 and serine-36, IκBα-SR). NF-κB transcriptional activity was evaluated by transient transfection of an NF-κB-driven luciferase reporter gene. Expression of IκBα-SR inhibited NF-κB stimulated by tumor necrosis factor α (TNFα) and 6-OHDA. Apoptosis was quantified by counting cells with condensed nuclei. IκBα-SR inhibited apoptosis induced by 6-OHDA but enhanced apoptosis that was triggered by TNFα. The converse effects of NF-κB could be due to different target genes that are induced in the context of TNFα and 6-OHDA stimulation. Indeed, TNFα stimulated mRNA accumulation of the anti-apoptotic superoxide dismutase 2 through NF-κB whereas 6-OHDA induced mRNA accumulation of the pro-apoptotic c-myc.
These data demonstrate that NF-κB regulates survival of the neuron-like PC12 cells in a stimulus-specific manner. In the context of 6-OHDA stimulation, NF-κB mediates pro-apoptotic effects, suggesting that NF-κB signaling could be a target for drug development in Parkinson-related neurodegeneration.
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This work was supported by a grant of the DFG to M.S.
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Tarabin, V., Schwaninger, M. The role of NF-κB in 6-hydroxydopamine- and TNFα-induced apoptosis of PC12 cells. Naunyn-Schmiedeberg's Arch Pharmacol 369, 563–569 (2004). https://doi.org/10.1007/s00210-004-0938-1
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DOI: https://doi.org/10.1007/s00210-004-0938-1