Cited by 47Epilepsy research and treatmentNeuroscience and Neuropharmacology ResearchMemory and Neural Mechanisms

Altered patterning of dentate granule cell mossy fiber inputs onto CA3 pyramidal cells in limbic epilepsy

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McAuliffe, John J., Bronson, Stefanie L., Hester, Michael S., Murphy, Brian L., Dahlquist‐Topalá, Renée, Richards, David A., Danzer, Steve C.·2011·Hippocampus

Abstract

Impaired gating by hippocampal dentate granule cells may promote the development of limbic epilepsy by facilitating seizure spread through the hippocampal trisynaptic circuit. The second synapse in this circuit, the dentate granule cell≫CA3 pyramidal cell connection, may be of particular importance because pathological changes occurring within the dentate likely exert their principal effect on downstream CA3 pyramids. Here, we utilized GFP-expressing mice and immunolabeling for the zinc transporter ZnT-3 to reveal the pre- and postsynaptic components of granule cell≫CA3 pyramidal cell synapses following pilocarpine-epileptogenesis. Confocal analyses of these terminals revealed that while granule cell presynaptic giant boutons increased in size and complexity 1 month after status epilepticus, individual thorns making up the postsynaptic thorny excrescences of the CA3 pyramidal cells were reduced in number. This reduction, however, was transient, and 3 months after status, thorn density recovered. This recovery was accompanied by a significant change in the distribution of thorns along pyramidal cells dendrites. While thorns in control animals tended to be tightly clustered, thorns in epileptic animals were more evenly distributed. Computational modeling of thorn distributions predicted an increase in the number of boutons required to cover equivalent numbers of thorns in epileptic vs. control mice. Confirming this prediction, ZnT-3 labeling of presynaptic giant boutons apposed to GFP-expressing thorns revealed a near doubling in bouton density, while the number of individual thorns per bouton was reduced by half. Together, these data provide clear evidence of novel plastic changes occurring within the epileptic hippocampus.

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  • Limbic epileptogenesis involves a partially-understood molecular cascade that results in aberrant neuronal connectivity and chronic recurrent spontaneous seizures.

    “Development of TLE or limbic epileptogenesis [4, 5] involves a partially-understood molecular cascade [6] that results in aberrant neuronal connectivity [7, 8] from a multi-architecture neuronal network of the limbic system connected to hippocampal formation [9] that contributes to a systemic process in the brain that leads to chronic recurrent spontaneous seizures [10].”

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Authors
McAuliffe, J. J., Bronson, S. L., Hester, M. S., Murphy, B. L., Dahlquist‐Topalá, R., Richards, D. A., & Danzer, S. C.
Affiliations
  • Cincinnati Children's Hospital Medical Center (US)
  • University of Cincinnati (US)
Corresponding author
Danzer, Steve C.
Venue
Hippocampus
Publisher
Wiley
Published
2010-12-23
Volume
21
Issue
1
Pages
93-107
ISSN
  • 1050-9631 (ISSN-L)
  • 1098-1063
OpenAlex
W2041510888
Cited by
47
References
62
Citations by year
2025: 1 · 2024: 2 · 2023: 1 · 2022: 1 · 2021: 2 · 2020: 1 · 2019: 2 · 2018: 5 · 2017: 3 · 2016: 4 · 2015: 6 · 2014: 4 · 2013: 3 · 2012: 4
FWCI
2.47
Type
journal article
Language
en
Open access
Locations
  • Hippocampus (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Korea Electrotechnology Research Institute
  • National Institutes of Health
  • National Institute of Neurological Disorders and Stroke (R01NS054750, R01NS065020, R01NS062806)
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Epilepsy research and treatment
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
Keywords
limbic epilepsy, dentate gyrus granule cells, CA3 pyramidal cells, mossy fiber synapses, status epilepticus, synaptic plasticity, computational modeling, seizure propagation
MeSH terms
Animals, Epilepsy, Immunohistochemistry, Male, Mice, Inbred C57BL, Mice, Transgenic, Neural Pathways, Neuronal Plasticity, Pilocarpine, Presynaptic Terminals, Pyramidal Cells, Microscopy, Confocal, Muscarinic Agonists, Mossy Fibers, Hippocampal, Mice

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