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Synaptic activity controls autophagic vacuole motility and function in dendrites.

Vineet Vinay Kulkarni1, Anip Anand1, Jessica Brandt Herr1

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Synaptic activity controls the movement and function of autophagic vacuoles in dendrites, crucial for learning and memory. This process enhances degradative autolysosomes in dendrites, impacting the synaptic proteome.

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Area of Science:

  • Neuroscience
  • Cell Biology

Background:

  • Macroautophagy (autophagy) is vital for learning and memory, indicating its importance at neuronal synapses.
  • Regulation of autophagy by synaptic activity remains poorly understood at a molecular level.

Purpose of the Study:

  • To investigate how synaptic activity modulates the autophagy pathway in primary hippocampal neurons.
  • To define the molecular mechanisms controlling autophagic vacuoles (AVs) dynamics and function within neurons.

Main Methods:

  • Live-cell confocal microscopy was employed to visualize and track autophagic vacuoles in primary hippocampal neurons.
  • Neuronal activity was manipulated using various paradigms to assess its impact on autophagy.

Main Results:

  • Synaptic activity differentially regulates the motility of autophagic vacuoles (AVs) in neuronal compartments.
  • Stimulating synaptic activity reduced AV motility in dendrites, while silencing activity increased it.
  • Activity-dependent effects were local, reversible, and specific to dendrites, not axons, with increased degradative autolysosomes observed in dendrites.

Conclusions:

  • Synaptic activity locally controls AV dynamics and function within dendrites.
  • This regulation may play a key role in managing the synaptic proteome.
  • The findings propose a model for activity-dependent autophagy in neuronal plasticity.