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Related Experiment Video

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Immunohistochemical Visualization of Hippocampal Neuron Activity After Spatial Learning in a Mouse Model of Neurodevelopmental Disorders
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Developmental decrease of entorhinal-hippocampal communication in immune-challenged DISC1 knockdown mice.

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  • 1Institute of Developmental Neurophysiology, Center for Molecular Neurobiology, University Medical Center Hamburg-Eppendorf, 20251, Hamburg, Germany. xiaxia.xu@zmnh.uni-hamburg.de.

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Summary

Early-life psychiatric risk impairs recognition memory and brain network communication in mice. This dysfunction stems from underdeveloped connections between the lateral entorhinal cortex and hippocampus during development.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Psychiatry

Background:

  • Cognitive deficits in mental disorders are linked to prefrontal-hippocampal dysfunction.
  • The lateral entorhinal cortex (LEC) connects the prefrontal cortex (PFC) and hippocampus (HP), but its role in early developmental dysfunction is unclear.

Purpose of the Study:

  • To investigate the contribution of the lateral entorhinal cortex to early-life cognitive deficits in a mouse model of psychiatric risk.

Main Methods:

  • Utilized a mouse model (GE mice) mimicking dual genetic and environmental etiology of psychiatric risk.
  • Assessed recognition memory and neural network communication at pre-juvenile stages.
  • Examined projections and synaptic function between LEC, HP, and PFC.

Main Results:

  • GE mice exhibited poor LEC-dependent recognition memory and abnormal LEC-HP-PFC network communication.
  • Neonatal GE mice showed sparser LEC to CA1 projections and reduced axonal terminal efficiency.
  • Direct LEC to PFC connections were unaffected, but PFC was indirectly compromised via the HP.

Conclusions:

  • The entorhinal-hippocampal circuit is impaired from neonatal stages in mice with psychiatric risk factors.
  • Early-life dysfunction in the LEC-HP-PFC network contributes to cognitive deficits.
  • This highlights the critical role of early development in shaping neural circuits relevant to mental disorders.