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Neogenin in Amygdala for Neuronal Activity and Information Processing.

Xiang-Dong Sun1,2, Wen-Bing Chen3,4,2, Dong Sun3,2

  • 1School of Basic Medical Sciences, Second Affiliated Hospital of Guangzhou Medical University, Guangzhou 510260, China, doubao0512@126.com wen-cheng.xiong@case.edu.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
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Neogenin is crucial for fear memory in mice. This protein supports neuronal activation and synaptic plasticity in the amygdala, essential for processing fear information.

Keywords:
Neogeninamygdalafear memorysynaptic transmission

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Fear learning and memory are essential for survival, with amygdala dysfunction linked to neuropsychiatric disorders.
  • Neuronal activation within the amygdala is critical for fear memory, but regulatory mechanisms remain unclear.
  • Neogenin, a DCC family receptor, is known for roles in axon navigation and neurogenesis.

Purpose of the Study:

  • To investigate the role of Neogenin in fear learning and memory.
  • To elucidate the molecular mechanisms underlying Neogenin's function in the amygdala.
  • To explore Neogenin's impact on neuronal activation, synaptic plasticity, and neurotransmission.

Main Methods:

  • Utilized genetic manipulation in male Neogenin mutant mice.
  • Conducted tone-cued fear training and assessed neuronal activation via cFos+ counts.
  • Performed electrophysiological recordings to evaluate synaptic plasticity and neurotransmission (e.g., Long-Term Potentiation, mEPSCs).
  • Analyzed spine density in BLA excitatory neurons.

Main Results:

  • Neogenin mutant mice exhibited impaired fear memory.
  • Reduced neuronal activation (cFos+) in the Basolateral amygdala (BLA) of mutant mice.
  • Neogenin mutation decreased cortical afferent input and compromised Long-Term Potentiation in BLA pyramidal neurons.
  • Observed reduced spine density and miniature excitatory postsynaptic current (mEPSC) frequency, but not inhibitory currents.
  • Ablation of Neogenin in adult BLA impaired fear memory, linked to reduced mEPSC frequency.

Conclusions:

  • Neogenin plays a critical, previously unrecognized role in amygdala function.
  • Neogenin promotes neurotransmission and synaptic plasticity, thereby supporting fear memory processing.
  • Findings provide insight into the molecular mechanisms of neuronal activation in the amygdala for fear processing.