The cellular and synaptic location of activated TrkB in mouse hippocampus during limbic epileptogenesis
Open accessAbstract
Understanding the mechanisms of limbic epileptogenesis in cellular and molecular terms may provide novel therapeutic targets for its prevention. The neurotrophin receptor tropomyosin-related kinase B (TrkB) is thought to be critical for limbic epileptogenesis. Enhanced activation of TrkB, revealed by immunodetection of enhanced phosphorylated TrkB (pTrkB), a surrogate measure of its activation, has been identified within the hippocampus in multiple animal models. Knowledge of the cellular locale of activated TrkB is necessary to elucidate its functional consequences. Using an antibody selective to pTrkB in conjunction with confocal microscopy and cellular markers, we determined the cellular and subcellular locale of enhanced pTrkB induced by status epilepticus (SE) evoked by infusion of kainic acid into the amygdala of adult mice. SE induced enhanced pTrkB immunoreactivity in two distinct populations of principal neurons within the hippocampus-the dentate granule cells and CA1 pyramidal cells. Enhanced immunoreactivity within granule cells was found within mossy fiber axons and giant synaptic boutons. By contrast, enhanced immunoreactivity was found within apical dendritic shafts and spines of CA1 pyramidal cells. A common feature of this enhanced pTrkB at these cellular locales is its localization to excitatory synapses between excitatory neurons, presynaptically in the granule cells and postsynaptically in CA1 pyramidal cells. Long-term potentiation (LTP) is one cellular consequence of TrkB activation at these excitatory synapses that may promote epileptogenesis.
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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].”
From Hippocampal neuro-networks and dendritic spine perturbations in epileptogenesis are attenuated by neuroprotectin D1 (2015) · cites this paper as [5]
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- Authors
- Helgager, J., Liu, G., & McNamara, J. O.
- Affiliations
- Duke Medical Center (US)
- Duke University (US)
- Corresponding author
- McNamara, James O.
- ORCID
- McNamara, James O.
- Venue
- Journal of Comparative Neurology
- Publisher
- Wiley
- Published
- 2012-12-17
- Volume
- 521
- Issue
- 3
- Pages
- 499-521
- ISSN
- 0021-9967 (ISSN-L)
- 1096-9861
- PMC
- PMC3527653
- OpenAlex
- W2015799055
- Cited by
- 17
- References
- 66
- Citations by year
- 2025: 1 · 2024: 1 · 2023: 1 · 2021: 1 · 2020: 1 · 2019: 1 · 2018: 2 · 2016: 1 · 2015: 2 · 2014: 4 · 2013: 2
- FWCI
- 1.82
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- The Journal of Comparative Neurology (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Institute of General Medical Sciences (T32GM008441)
- National Institute of Neurological Disorders and Stroke (R01NS056217, NS056217)
- 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 › Cellular and Molecular Neuroscience › Nerve injury and regeneration
- Keywords
- TrkB, status epilepticus, kainic acid, hippocampus, dentate gyrus granule cells, CA1 pyramidal neurons, excitatory synapses, synaptic localization, long-term potentiation, neurotrophin receptors, amygdala, dendritic spines
- MeSH terms
- Animals, Disease Models, Animal, Female, Immunohistochemistry, Kainic Acid, Limbic System, Male, Membrane Glycoproteins, Mice, Inbred C57BL, Mice, Transgenic, Pilocarpine, Protein-Tyrosine Kinases, Status Epilepticus, Synapses, Long-Term Potentiation, Pyramidal Cells, Excitatory Amino Acid Agonists, Muscarinic Agonists, Dentate Gyrus, Mossy Fibers, Hippocampal, Receptor, trkB, Green Fluorescent Proteins, Mice, CA1 Region, Hippocampal
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