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Autophagic bias in the striatum
Irena Pigulevskiy1, Ori J Lieberman1, David Sulzer1,2,3
1Department of Psychiatry, Columbia University Vagelos College of Physicians and Surgeons , New York, NY, USA.
Autophagy
|March 17, 2020
Summary
Autophagy differentially regulates distinct striatal neuron types, impacting motor learning and neuronal excitability. This study reveals unique roles for autophagy in direct pathway spiny projection neurons (dSPNs) and indirect pathway spiny projection neurons (iSPNs).
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- Macroautophagy/autophagy is crucial for neuronal function, regulating synaptic plasticity.
- Autophagic degradation differences across neuronal subtypes remain largely unexplored.
- Striatal spiny projection neurons (SPNs) comprise direct (dSPN) and indirect (iSPN) pathways with distinct functions.
Purpose of the Study:
- To investigate the differential roles of autophagy in dSPNs and iSPNs.
- To elucidate the impact of autophagy absence on neuronal development and function.
- To identify specific molecular mechanisms of autophagic regulation in distinct neuronal populations.
Main Methods:
- Utilized behavioral and electrophysiological experiments in mice.
- Examined the effects of autophagy deficiency in dSPNs and iSPNs.
- Investigated the regulation of KCNJ/Kir2 ion channels in iSPNs.
Main Results:
- Autophagy absence in dSPNs uniquely impaired synaptic input development.
- Autophagy absence in iSPNs uniquely affected intrinsic excitability.
- Autophagic control of iSPN intrinsic excitability involves regulation of KCNJ/Kir2 ion channels.
Conclusions:
- Autophagy plays distinct, pathway-specific roles in striatal principal neurons.
- Autophagy is essential for dSPN synaptic development and iSPN intrinsic excitability.
- This study demonstrates autophagic control over neuronal intrinsic excitability via ion channel regulation.
