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Related Concept Videos

Depression: Overview01:18

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Depression is a prevalent mental illness marked by persistent sadness and lack of interest in previously enjoyable activities. It can take several forms, including major depression, persistent depressive disorder, and bipolar I and II disorders. Symptoms range from emotional changes like chronic worry to physical changes like sleep disturbances and suicidal thoughts. From a neurobiological perspective, depression is believed to be triggered by abnormalities in the brain's prefrontal cortex,...
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Depressive disorders result from a complex interplay of biological, psychological, and sociocultural factors, each contributing uniquely to the development and persistence of the condition. Understanding these factors provides critical insight into the multifaceted nature of depression.
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Related Experiment Video

Updated: Sep 24, 2025

Animal Models of Depression - Chronic Despair Model CDM
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Synaptic Mechanisms Regulating Mood State Transitions in Depression.

Puja K Parekh1, Shane B Johnson1, Conor Liston1

  • 1Department of Psychiatry and Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, New York, New York, USA;

Annual Review of Neuroscience
|May 4, 2022
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Depression involves brain state changes and reduced neural plasticity. Antidepressants enhance plasticity and synaptogenesis, helping to reverse these effects and sustain recovery.

Keywords:
dendritic spinesdepressionketaminerapid-acting antidepressantsstresssynaptic plasticity

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Area of Science:

  • Neurobiology
  • Psychiatry
  • Cellular Neuroscience

Background:

  • Depression is characterized by mood state transitions with unclear neurobiological underpinnings.
  • Antidepressants impact synapse function, neurotransmission, and plasticity in stress-sensitive brain regions.
  • Synaptic remodeling is implicated in depression pathophysiology and antidepressant action.

Purpose of the Study:

  • To review evidence for a model of depression as a distinct brain state.
  • To elucidate the role of synaptogenesis in depression and antidepressant function.
  • To understand how antidepressants reconfigure brain states and promote recovery.

Main Methods:

  • Literature review of studies on depression, neurobiology, and antidepressant mechanisms.
  • Analysis of evidence supporting a distinct brain state model of depression.
  • Examination of the role of synaptic plasticity and synaptogenesis.

Main Results:

  • Depression is modeled as a distinct brain state with altered neuronal function and reduced plasticity.
  • Antidepressants initially facilitate plasticity, reconfiguring the brain state.
  • Synaptogenesis plays a crucial role in sustaining the therapeutic effects of antidepressants over time.

Conclusions:

  • Synaptic remodeling, including synaptogenesis, is central to depression and antidepressant action.
  • Antidepressants promote recovery by enhancing neural plasticity and enabling adaptive brain state reconfiguration.
  • Understanding these mechanisms is key to developing more effective depression treatments.