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Related Experiment Video

Updated: Sep 6, 2025

Evaluation of Synapse Density in Hippocampal Rodent Brain Slices
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Imaging synaptic density in depression.

Sophie E Holmes1, Chadi Abdallah2,3, Irina Esterlis4,5,6

  • 1Department of Psychiatry, Yale University, New Haven, CT, USA.

Neuropsychopharmacology : Official Publication of the American College of Neuropsychopharmacology
|June 29, 2022
PubMed
Summary
This summary is machine-generated.

Major depressive disorder involves synaptic changes, with ketamine potentially restoring synapses. Neuroimaging techniques like MRI and PET help evaluate these synaptic alterations in humans, aiding treatment development.

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Area of Science:

  • Neuroscience
  • Psychiatry

Background:

  • Major depressive disorder (MDD) is common and heterogeneous, with over 50% experiencing treatment resistance.
  • Initial research focused on monoamine systems, but recent studies highlight synaptic involvement in MDD.
  • Stress and depression are linked to reduced synaptic density, dendritic spines, boutons, and glia.

Purpose of the Study:

  • To describe the use of neuroimaging techniques for evaluating synaptic alterations in human depression.
  • To measure synaptic restoration following ketamine administration in individuals with depression.

Main Methods:

  • Utilizing magnetic resonance imaging (MRI) and positron emission tomography (PET) for in vivo assessment.
  • Observing synaptic density, dendritic spine, bouton, and glial changes associated with depression and stress.
  • Preclinical evidence suggests ketamine promotes rapid synaptic restoration or synaptogenesis.

Main Results:

  • Neuroimaging studies provide in vivo evidence of synaptic alterations in human depression.
  • Ketamine administration shows potential for rapid synaptic restoration or synaptogenesis.
  • These techniques allow for the measurement of synaptic changes in response to treatment.

Conclusions:

  • Neuroimaging techniques are valuable tools for understanding synaptic alterations in depression.
  • These methods advance the development of targeted and effective depression treatments.
  • Further research is needed to fully elucidate the role of synaptic changes in MDD and its treatment.