Long-term changes in the CA3 associative network of fear-conditioned mice

Gürsel Çalşkan, Anne Albrecht, Jan O. Hollnagel, Anton Rösler, Gal Richter-Levin, Uwe Heinemann, Oliver Stork

Research output: Contribution to journalArticlepeer-review


The CA3 associative network plays a critical role in the generation of network activity patterns related to emotional state and fear memory. We investigated long-term changes in the corticosterone (CORT)-sensitive function of this network following fear conditioning and fear memory reactivation. In acute slice preparations from mice trained in either condition, the ratio of orthodromic population spike (PS) to antidromic PS was reduced compared to unconditioned animals, indicating a decrease in efficacy of neuronal coupling within the associative CA3 network. However, spontaneous sharp wave-ripples (SW-R), which are thought to arise from this network, remained unaltered. Following CORT application, we observed an increase in orthodromic PS and a normalization to control levels of their ratio to antidromic PS, while SW-R increased in slices of fear conditioned and fear reactivated mice, but not in slices of unconditioned controls. Together with our previous observations of altered hippocampal gamma activity under these learning paradigms, these data suggest that fear conditioning and fear reactivation lastingly alters the CORT-sensitive configuration of different network activity patterns generated by the CA3 associational network. Observed changes in the mRNA expression of receptors for glutamate, GABA and cannabinoids in the stratum pyramidale of area CA3 may provide a molecular mechanism for these adaptive changes.

Original languageEnglish
Pages (from-to)188-197
Number of pages10
Issue number2
StatePublished - 4 Mar 2015

Bibliographical note

Publisher Copyright:
© 2015 Informa UK Ltd. All rights reserved.


  • CA3 associative network
  • corticosterone
  • fear memory
  • glutamatergic receptors
  • sharp waveripples
  • ventral hippocampus

ASJC Scopus subject areas

  • Endocrine and Autonomic Systems
  • Neuropsychology and Physiological Psychology
  • Psychiatry and Mental health
  • Physiology
  • Behavioral Neuroscience


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