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Localization of the Locus Coeruleus in the Mouse Brain
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Localization of the Locus Coeruleus in the Mouse Brain

Published on: March 7, 2019

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Locus coeruleus-CA1 projections are involved in chronic depressive stress-induced hippocampal vulnerability to

Qian Zhang1, Dian Xing Hu2, Feng He1

  • 1Department of Neurobiology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.

Nature Communications
|July 5, 2019
PubMed

Insights

Depression exacerbates brain injury after transient ischemic attacks by altering the locus coeruleus to CA1 neural circuit. This pathway is crucial for understanding and potentially treating depression-related ischemic events.

Area of Science:

  • Neuroscience
  • Psychiatry
  • Neurology

Background:

  • Depression and transient ischemic attack (TIA) are common conditions with known associations.
  • The neural mechanisms linking depression to worsened ischemic injury remain largely unknown.

Purpose of the Study:

  • To investigate the neural circuits underlying depression's impact on ischemic injury.
  • To identify potential therapeutic targets for depression-related TIA.

Main Methods:

  • Utilized mouse models of chronic stress (social defeat and footshock stress).
  • Induced transient global ischemia (TGI) and assessed neuronal loss and cognitive deficits.
  • Employed whole-brain mapping and chemogenetics (DREADDs) to analyze locus coeruleus (LC) projections to the CA1 region.

Main Results:

  • Chronic stress models exacerbated CA1 neuron loss and spatial memory impairment post-TGI.
  • Stress decreased the output from locus coeruleus (LC) to CA1 neurons.
  • The Th:LC-CA1 circuit was identified as necessary and sufficient for stress-induced worsening of TGI outcomes.

Conclusions:

  • The Th:LC-CA1 pathway is critical in mediating vulnerability to ischemic injury in the context of depression.
  • This pathway represents a potential target for interventions against depression-related transient ischemic attacks.

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