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Synaptic Plasticity in the Injured Brain Depends on the Temporal Pattern of Stimulation
Quentin S Fischer1,2,3, Djanenkhodja Kalikulov1,2,3, Gonzalo Viana Di Prisco3
1Fralin Biomedical Research Institute at VTC, Roanoke, Virginia, USA.
Journal of Neurotrauma
|May 31, 2024
Summary
Neurostimulation
Area of Science:
- Neuroscience
- Synaptic Plasticity
- Brain Injury Research
Background:
- Neurostimulation is a therapeutic tool for brain injury.
- Synaptic plasticity (LTP/LTD) is sensitive to stimulation frequency.
- The role of temporal stimulation patterns in brain injury plasticity is unknown.
Purpose of the Study:
- To investigate how temporal patterns and frequency of neurostimulation interact.
- To explore these interactions in normal and mild traumatic brain injury (mTBI) models.
- To inform neurostimulation therapies for brain injury and understand normal plasticity.
Main Methods:
- Whole-cell patch-clamp and field potential recordings in rat visual cortex slices.
- Stimulation protocols varied in frequency (1-100 Hz), continuity, and temporal pattern (regular to highly irregular).
- Compared plasticity outcomes in naive, sham-operated, and mTBI rats.
Main Results:
- Highly irregular 1 Hz or 10 Hz stimulation induced LTD in controls but LTP in mTBI rats.
- Field potential recordings corroborated single-neuron findings, suggesting network-level effects.
- Stimulation dynamics predicted final plasticity outcomes.
Conclusions:
- Temporal stimulation patterns significantly influence synaptic plasticity polarity and magnitude.
- Responses differ markedly between normal and injured brains.
- Findings may optimize neurostimulation for mTBI and other brain disorders.
Keywords:
brain stimulationelectrophysiologylong-term depressionlong-term potentiationneural codingtraumatic brain injuryMore Related Videos
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