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Updated: Jun 15, 2025
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Microfluidics-Assisted Selective Depolarization of Axonal Mitochondria
Published on: August 4, 2022
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Axonal mitochondria regulate gentle touch response through control of axonal actin dynamics
Sneha Hegde1, Souvik Modi1, Ennis W Deihl2
1Tata Institute of Fundamental Research, Homi Bhabha Road, Navy Nagar, Colaba, Mumbai-400005, India.
Biorxiv : the Preprint Server for Biology
|August 26, 2024
Summary
Mitochondria in neurons control actin dynamics, essential for electrical synapses and gentle touch behavior in C. elegans. This study reveals mitochondria
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Actin dynamics in neuronal processes are crucial for neuronal function but their origins and regulation remain unclear.
- Mitochondria are known to be vital for cellular energy but their specific roles in regulating neuronal actin dynamics are not well understood.
Purpose of the Study:
- To investigate the role of mitochondria in regulating actin dynamics within neuronal processes.
- To elucidate the mechanism by which mitochondria influence actin and its impact on neuronal function and behavior.
Main Methods:
- Utilized genetic mutants lacking mitochondria (ric-7, mtx-2; miro-1) in C. elegans touch receptor neurons (TRNs).
- Assessed actin dynamics, Spectrin Membrane Periodic Skeleton (MPS) integrity, and mitochondrial restoration.
- Examined the localization of gap junction proteins and C. elegans gentle touch response.
Main Results:
- Mutants lacking axonal mitochondria exhibited a loss of dynamic actin up to ~80 μm.
- Restoring mitochondria in TRNs rescued dynamic actin in a sod-2 dependent manner.
- Dynamic actin was found to be necessary and sufficient for gap junction protein localization and the gentle touch response.
Conclusions:
- Axonal mitochondria locally facilitate actin dynamics via reactive oxygen species, which is essential for electrical synapses and behavior.
- This study identifies a novel mechanism linking mitochondria, actin dynamics, and neuronal function in vivo.
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