Cited by 202Neuroscience and Neuropharmacology ResearchMemory and Neural MechanismsGenetics and Neurodevelopmental Disorders

Cognitive disruption and altered hippocampus synaptic function in Reelin haploinsufficient mice

QIU, S, KORWEK, K, PRATTDAVIS, A, PETERS, M, BERGMAN, M, WEEBER, E·2006·Neurobiology of Learning and Memory

Abstract

The heterozygote reeler mouse (HRM) shows many neuroanatomical and biochemical features that are also present in some human cognitive disorders, such as schizophrenia. In the present study, hippocampal dependent plasticity and cognitive function of the HRM were characterized in detail in an attempt to reveal phenotypic functional differences that result from Reelin haploinsufficiency. The HRM and wild type mice show similar levels of overall activity, coordination, thermal nociception, startle responses, and anxiety-like behavior. In addition, both genotypes show similar shock threshold, identical cued freezing behavior and comparable spatial learning in Morris water maze tasks. However, a significant reduction in contextual fear conditioned learning was observed in the HRM. Electrophysiological studies in hippocampal CA1 synapses revealed a plethora of differences between genotypes. The HRM exhibits reduced field excitatory postsynaptic potentials in responses to similar synaptic inputs, lowered paired pulse facilitation ratio and impaired long-term depression and tetanus-induced long-term potentiation (LTP). Also, deficits were detected in LTP elicited by theta burst stimulation or by a whole cell pairing protocol. These physiologic differences could not be accounted for by changes in the overall amount of glutamate receptor subunits. In addition, it was determined that network-driven excitatory and inhibitory activities recorded in CA1 pyramidal neurons showed that the HRM had comparable amplitude and frequency of spontaneous excitatory postsynaptic currents, but a marked reduction in spontaneous inhibitory postsynaptic currents. Thus, the HRM exhibits a specific hippocampal-dependent learning deficit accompanied with a pronounced impairment of hippocampal plasticity and functional inhibitory innervation.

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Crossref · 10.1016/j.nlm.2005.11.001

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Authors
QIU, S., KORWEK, K., PRATTDAVIS, A., PETERS, M., BERGMAN, M., & WEEBER, E.
Affiliations
Vanderbilt University Medical Center (US)
Corresponding author
WEEBER, E
Venue
Neurobiology of Learning and Memory
Publisher
Elsevier BV
Published
2006-05
Volume
85
Issue
3
Pages
228-242
ISSN
1074-7427 (ISSN-L)
OpenAlex
W2069581520
Cited by
202
References
59
Citations by year
2026: 1 · 2025: 3 · 2024: 1 · 2023: 7 · 2022: 11 · 2021: 10 · 2020: 10 · 2019: 5 · 2018: 7 · 2017: 8 · 2016: 14 · 2015: 16 · 2014: 11 · 2013: 12 · 2012: 8
FWCI
4.70
Type
journal article
Language
en
Open access
closed
Locations
  • Neurobiology of Learning and Memory (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • American Federation for Aging Research
  • National Institute on Aging
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
Keywords
hippocampus, synaptic plasticity, long-term potentiation, long-term depression, contextual fear conditioning, CA1 pyramidal neurons, inhibitory postsynaptic currents, excitatory postsynaptic potentials, paired-pulse facilitation, glutamate receptor subunits, schizophrenia, cognitive impairment
MeSH terms
Reelin Protein, Animals, Cognition Disorders, Conditioning, Psychological, Fear, Female, Genotype, Haploidy, Heterozygote, Hippocampus, Male, Nerve Tissue Proteins, Neural Inhibition, Serine Endopeptidases, Synapses, Cell Adhesion Molecules, Neuronal, Extracellular Matrix Proteins, Maze Learning, Mice

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