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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Computational Biology

Background:

  • Homeostatic plasticity maintains neuronal firing stability.
  • Extended activity deprivation can lead to adverse effects on neural properties.
  • Previous studies primarily examined short-term (2-day) silencing effects.

Purpose of the Study:

  • Investigate synaptic and cellular changes during prolonged (5-day) neuronal silencing.
  • Understand presynaptic and postsynaptic modifications in homeostatic plasticity.
  • Characterize the impact of severe activity deprivation on cortical networks.

Main Methods:

  • Developed a computational framework for analyzing super-resolution microscopy images.
  • Measured presynaptic and postsynaptic compartment number and morphology.
  • Utilized electrophysiology (mEPSC) and electron microscopy for synaptic analysis.

Main Results:

  • Prolonged deprivation strengthened excitatory synapses both pre- and postsynaptically.
  • Observed a significant decrease in excitatory synapse density.
  • Reduced dendritic spine density correlated with decreased synapse numbers.

Conclusions:

  • Cortical networks adapt to prolonged activity deprivation by enhancing individual synapse strength.
  • Homeostatic plasticity results in a transition to a sparser, stronger synaptic network.
  • These findings reveal progressive changes in neural structure and function under sustained silencing.