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Mfn2 downregulation in excitotoxicity causes mitochondrial dysfunction and delayed neuronal death
Alejandro Martorell-Riera1, Marc Segarra-Mondejar1, Juan P Muñoz2
1Department of Cell Biology, University of Barcelona, Barcelona, Spain CELLTEC-UB, University of Barcelona, Barcelona, Spain.
The EMBO Journal
|August 23, 2014
Summary
Mitochondrial dynamics are crucial for neuronal survival. This study reveals that reduced Mfn2 expression contributes to delayed neuronal death during excitotoxicity, offering a potential therapeutic target for stroke.
Area of Science:
- Neuroscience
- Cell Biology
- Mitochondrial Dynamics
Background:
- Mitochondrial fusion and fission are vital for cellular health.
- Excitotoxicity causes neuronal mitochondrial fragmentation, but the mechanisms are unclear.
Purpose of the Study:
- To investigate the role of mitochondrial fusion/fission machinery in excitotoxicity.
- To identify molecular mechanisms underlying delayed neuronal death.
Main Methods:
- Examined Mfn2 expression in vitro and in vivo models of excitotoxicity.
- Assessed mitochondrial fragmentation, function, and neuronal death.
- Investigated the role of transcription factor MEF2.
Main Results:
- Mfn2 expression is reduced during excitotoxicity, unlike other fusion/fission proteins.
- Mfn2 downregulation contributes to delayed mitochondrial fragmentation and neuronal death.
- MEF2 degradation by excitotoxicity causes Mfn2 downregulation.
Conclusions:
- Mfn2 reduction is a late event in excitotoxicity, distinct from early Drp1-mediated fragmentation.
- Targeting Mfn2 may offer a therapeutic strategy for excitotoxic brain injury, potentially widening the therapeutic window for stroke.
