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All-optical voltage interrogation for probing synaptic plasticity in vivo.

Jacques Carolan1, Michelle A Land2, Xiaoyu Lu2,3,4

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Researchers developed an all-optical method to study synaptic plasticity in the mouse cerebellum. This technique reveals how specific neural pathway activation triggers long-term changes in synaptic responses, crucial for learning and memory.

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Area of Science:

  • Neuroscience
  • Synaptic Plasticity
  • Cerebellar Function

Background:

  • Understanding synaptic plasticity is key to deciphering learning and memory mechanisms.
  • Existing methods lack the spatiotemporal resolution and sensitivity for in vivo studies of identified synapses.
  • New approaches are needed to selectively stimulate presynaptic inputs and record postsynaptic activity.

Purpose of the Study:

  • To develop and apply an all-optical method for probing synaptic plasticity in identified cerebellar synapses in awake, behaving mice.
  • To investigate the rules governing plasticity induction at these synapses.
  • To correlate neural activity with behavioral outputs.

Main Methods:

  • Developed JEDI-2Psub, a sensitive genetically encoded voltage indicator for recording subthreshold and suprathreshold activity.
  • Used optogenetics to selectively activate granule cell (GrC) inputs.
  • Employed sensory stimulation to activate climbing fiber (CF) inputs.
  • Recorded voltage signals across multiple Purkinje cell (PC) dendrites in neighboring neurons.

Main Results:

  • Demonstrated an all-optical approach to study synaptic plasticity in vivo.
  • Showed that pairing GrC activity with CF input triggers long-term plasticity of inhibitory responses in PCs.
  • Measured synaptic potentials and complex spike signals with high resolution.
  • Examined voltage signal correlations within and between neurons.

Conclusions:

  • The developed all-optical method provides a powerful tool for studying synaptic plasticity in the awake brain.
  • This approach enables the definition of rules for plasticity induction at identified synapses during behavior.
  • Findings offer insights into the neural basis of learning and memory in the cerebellum.