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CHCHD2 and CHCHD10 regulate mitochondrial dynamics and integrated stress response
Yu Ruan1,2,3, Jiaqiao Hu1,2, Yaping Che1,2
1The Sixth Affiliated Hospital of Jinan University, Jinan University, Dongguan, Guangdong, 523560, China.
Cell Death & Disease
|February 17, 2022
Summary
CHCHD2 and CHCHD10 proteins suppress mitochondrial stress responses by inhibiting the mitochondrial integrated stress response (mtISR). Their dysfunction is linked to neurodegenerative diseases like Parkinson's and ALS.
Area of Science:
- Cellular Biology
- Neuroscience
- Mitochondrial Biology
Background:
- Mitochondrial dysfunction is a key factor in neurological disorders.
- Mutations in CHCHD2 and CHCHD10 are linked to Parkinson's disease and ALS/FTD.
- The roles of CHCHD2 and CHCHD10 in cellular stress remain unclear.
Purpose of the Study:
- To elucidate the physiological and pathological functions of CHCHD2 and CHCHD10.
- To investigate the role of CHCHD2 and CHCHD10 in regulating mitochondrial stress responses.
- To identify CHCHD2 and CHCHD10 as potential therapeutic targets for neurodegenerative diseases.
Main Methods:
- Protein interaction studies (CHCHD2/CHCHD10 with OMA1 and eIF2a).
- Mitochondrial stress induction using CCCP.
- Analysis of mitochondrial integrated stress response (mtISR) activation.
- Gene knockdown experiments for CHCHD2 and CHCHD10.
Main Results:
- CHCHD2 and CHCHD10 interact with OMA1, suppressing its activity and thus restraining mtISR initiation and OPA1 processing.
- Under stress, CHCHD2 and CHCHD10 translocate to the cytosol, interacting with eIF2a to attenuate mtISR overactivation.
- Knockdown of CHCHD2/CHCHD10 triggers and enhances mtISR, especially under stress.
Conclusions:
- CHCHD2 and CHCHD10 function as mitochondrial "mtISR suppressors" in mammalian cells.
- These proteins play a critical role in regulating cellular responses to mitochondrial stress.
- Dysregulation of CHCHD2/CHCHD10 contributes to neurodegenerative disorders linked to their mutations.
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