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Limiting habenular hyperactivity ameliorates maternal separation-driven depressive-like symptoms.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Molecular Biology

Background:

  • Early-life stress is a risk factor for mood disorders.
  • The precise neurobiological mechanisms linking early stress to adult affective disorders are not fully understood.
  • Maternal separation (MS) in rodents is a common model for studying early-life stress.

Purpose of the Study:

  • To investigate the neurobiological underpinnings of depressive-like behaviors induced by early-life stress.
  • To identify potential therapeutic targets for stress-related mood disorders.

Main Methods:

  • Mice underwent maternal separation (MS) during early life.
  • Behavioral tests were used to assess depressive-like phenotypes in adult mice.
  • Electrophysiological recordings examined GABAB-GIRK signaling and lateral habenula (LHb) activity.
  • Chemogenetic tools and deep-brain stimulation were employed to modulate LHb activity.

Main Results:

  • MS induced depressive-like symptoms in adult mice.
  • MS reduced GABAB-GIRK signaling, leading to lateral habenula (LHb) hyperexcitability.
  • Reducing LHb hyperactivity ameliorated MS-induced depressive-like behaviors.

Conclusions:

  • Early-life stress disrupts GABAB-GIRK signaling and increases LHb excitability, contributing to adult mood dysfunction.
  • Modulating LHb activity presents a potential therapeutic avenue for stress-related affective disorders.