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Memory processing and apamin induce immediate early gene expression in mouse brain

C Heurteaux1, C Messier, C Destrade

  • 1Institut de Pharmacologie Moléculaire et Cellulaire, UPR 411 du CNRS, Sophia Antipolis, Valbonne, France.

Brain Research. Molecular Brain Research
|April 1, 1993
PubMed
Summary
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Learning enhances immediate early gene expression in the mouse hippocampus. Apamin, a neurotoxin, also boosts c-fos and c-jun gene expression, suggesting a link to improved learning and memory retention.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Behavioral Science

Background:

  • Immediate early genes (IEGs) like c-fos and c-jun are crucial molecular markers of neuronal activity and plasticity.
  • Learning processes induce specific patterns of gene expression in brain regions involved in memory formation.

Purpose of the Study:

  • To investigate the impact of learning on the spatial and temporal expression of c-fos and c-jun mRNA in the mouse brain.
  • To examine the effects of apamin, a neurotoxin that enhances learning, on IEG expression.

Main Methods:

  • Mice were trained on an appetitive bar-pressing task.
  • Quantification of c-fos and c-jun mRNA levels in hippocampal subregions (CA1, CA3, dentate gyrus) using techniques likely involving in situ hybridization or RT-PCR.
  • Administration of apamin or saline post-training and assessment of IEG expression.

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Main Results:

  • Training significantly increased c-fos and c-jun mRNA levels in the hippocampal formation, demonstrating learning-dependent activation.
  • Apamin administration resulted in a 3- to 5-fold increase in c-fos and c-jun expression compared to untrained animals.
  • Post-training apamin injection further enhanced IEG expression in specific hippocampal subregions compared to trained saline-injected mice.

Conclusions:

  • Learning-induced changes in immediate early gene expression are localized to the hippocampus.
  • Apamin's facilitation of learning may be associated with its ability to increase immediate early gene expression in key memory circuits.