Mitochondrial calcium uniporter Mcu controls excitotoxicity and is transcriptionally repressed by neuroprotective nuclear calcium signals
The recent identification of the mitochondrial Ca2+ uniporter gene (Mcu/Ccdc109a) has enabled us to address its role, and that of mitochondrial Ca2+ uptake, in neuronal excitotoxicity. Here we show that exogenously expressed Mcu is mitochondrially localized and increases mitochondrial Ca2+ levels fo...
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| Main Authors: | , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
18 Jun 2013
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| In: |
Nature Communications
Year: 2013, Volume: 4, Pages: 1-12 |
| ISSN: | 2041-1723 |
| DOI: | 10.1038/ncomms3034 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1038/ncomms3034 Verlag, lizenzpflichtig, Volltext: https://www.nature.com/articles/ncomms3034 
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| Author Notes: | Jing Qiu, Yan-Wei Tan, Anna M. Hagenston, Marc-Andre Martel, Niclas Kneisel, Paul A. Skehel, David J.A. Wyllie, Hilmar Bading & Giles E. Hardingham |
| Summary: | The recent identification of the mitochondrial Ca2+ uniporter gene (Mcu/Ccdc109a) has enabled us to address its role, and that of mitochondrial Ca2+ uptake, in neuronal excitotoxicity. Here we show that exogenously expressed Mcu is mitochondrially localized and increases mitochondrial Ca2+ levels following NMDA receptor activation, leading to increased mitochondrial membrane depolarization and excitotoxic cell death. Knockdown of endogenous Mcu expression reduces NMDA-induced increases in mitochondrial Ca2+, resulting in lower levels of mitochondrial depolarization and resistance to excitotoxicity. Mcu is subject to dynamic regulation as part of an activity-dependent adaptive mechanism that limits mitochondrial Ca2+ overload when cytoplasmic Ca2+ levels are high. Specifically, synaptic activity transcriptionally represses Mcu, via a mechanism involving the nuclear Ca2+ and CaM kinase-mediated induction of Npas4, resulting in the inhibition of NMDA receptor-induced mitochondrial Ca2+ uptake and preventing excitotoxic death. This establishes Mcu and the pathways regulating its expression as important determinants of excitotoxicity, which may represent therapeutic targets for excitotoxic disorders. |
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| Item Description: | Gesehen am 05.01.2022 |
| Physical Description: | Online Resource |
| ISSN: | 2041-1723 |
| DOI: | 10.1038/ncomms3034 |