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Related Concept Videos

Neuroplasticity01:01

Neuroplasticity

Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.
Bipolar Disorder01:30

Bipolar Disorder

Bipolar disorder is a chronic mental health condition marked by significant mood fluctuations, including episodes of mania and depression. Elevated energy levels, heightened mood or irritability, impulsive behavior, reduced sleep needs, rapid speech, racing thoughts, inflated self-esteem, and distractibility characterize mania. Individuals with bipolar disorder often alternate between depressive and manic states, with periods of emotional stability lasting an average of six months to a year.
Depressive Disorders: Etiology01:27

Depressive Disorders: Etiology

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.
Biological Factors in Depression
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Long-term Depression01:03

Long-term Depression

Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
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Long-term Depression01:05

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Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
Depressive Disorders: MDD and Dysthymia01:27

Depressive Disorders: MDD and Dysthymia

Depressive disorders are a group of mental health conditions characterized by pervasive feelings of sadness, diminished pleasure in life, and a significant impact on daily functioning. These conditions are most prevalent in individuals during their 30s and affect women at twice the rate of men. Contrary to popular belief, younger individuals are generally more susceptible to these disorders than older adults. Two key types of depressive disorders include Major Depressive Disorder (MDD) and...

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Related Experiment Video

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Developing a Rat Model for Bipolar Disorder
04:42

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Published on: May 2, 2025

Neuroplasticity in mood disorders.

Wayne C Drevets1

  • 1MD, Mood and Anxiety Disorders Program, NIH NIMH/MIB, 15K North Dr, Bethesda, Md, USA.

Dialogues in Clinical Neuroscience
|October 29, 2011
PubMed
Summary
This summary is machine-generated.

Major depressive disorder (MDD) and bipolar disorder (BD) show persistent brain structural abnormalities, potentially linked to elevated stress hormones and glutamate transmission. Treatments may reverse these changes.

Keywords:
bipolar disordermajor depressive disorderneuro-imaging abnormalitiesneuroplasticitypostmortem studies

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Neurobiology

Background:

  • Major depressive disorder (MDD) and bipolar disorder (BD) are associated with structural brain abnormalities in key areas like the prefrontal cortex and amygdala.
  • These abnormalities persist across illness episodes and may precede depressive episodes in high-risk individuals.

Purpose of the Study:

  • To investigate the neurobiological underpinnings of structural brain abnormalities in MDD and BD.
  • To explore the relationship between these abnormalities, glutamatergic transmission, and stress hormone levels.
  • To examine the potential role of neurotrophic effects of medications in reversing these changes.

Main Methods:

  • Neuroimaging studies identifying structural abnormalities in specific brain regions.
  • Postmortem neuropathological studies examining synaptic markers, glial cells, and neurons.
  • Metabolic studies measuring glucose metabolism and correlating it with plasma cortisol levels.

Main Results:

  • Structural abnormalities were found in the prefrontal cortex, amygdala, hippocampus, and other brain regions in MDD and BD patients.
  • Elevated glucose metabolism, indicative of increased glutamatergic transmission, was observed in affected regions during depressive episodes.
  • Increased glutamatergic transmission and elevated plasma cortisol levels co-occurred, suggesting a link to stress-induced neuronal changes.
  • Mood-stabilizing and antidepressant drugs with neurotrophic effects may reverse gray matter volume abnormalities.

Conclusions:

  • Structural brain abnormalities are a persistent feature of MDD and BD, potentially influenced by chronic stress and glutamatergic hyperactivity.
  • The findings suggest that neurotrophic mechanisms of medications may contribute to therapeutic effects by reversing these structural changes.