Cited by 104Neuroscience and Neuropharmacology ResearchMemory and Neural MechanismsNeural dynamics and brain function

LTP at Hilar Mossy Cell-Dentate Granule Cell Synapses Modulates Dentate Gyrus Output by Increasing Excitation/Inhibition Balance

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Hashimotodani, Yuki, Nasrallah, Kaoutsar, Jensen, Kyle R., Chávez, Andrés E., Carrera, Daniel, Castillo, Pablo E.·2017·Neuron

Abstract

Excitatory hilar mossy cells (MCs) in the dentate gyrus receive inputs from dentate granule cells (GCs) and project back to GCs locally, contralaterally, and along the longitudinal axis of the hippocampus, thereby establishing an associative positive-feedback loop and connecting functionally diverse hippocampal areas. MCs also synapse with GABAergic interneurons that mediate feed-forward inhibition onto GCs. Surprisingly, although these circuits have been implicated in both memory formation (e.g., pattern separation) and temporal lobe epilepsy, little is known about activity-dependent plasticity of their synaptic connections. Here, we report that MC-GC synapses undergo a presynaptic, NMDA-receptor-independent form of long-term potentiation (LTP) that requires postsynaptic brain-derived neurotrophic factor (BDNF)/TrkB and presynaptic cyclic AMP (cAMP)/PKA signaling. This LTP is input specific and selectively expressed at MC-GC synapses, but not at the disynaptic inhibitory loop. By increasing the excitation/inhibition balance, MC-GC LTP enhances GC output at the associative MC-GC recurrent circuit and may contribute to dentate-dependent forms of learning and epilepsy.

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  1. Buckmaster PS Wenzel HJ Kunkel DD Schwartzkroin PA 1996 Axon arbors and synaptic connections of hippocampal mossy cells in the rat in vivo J Comp Neurol 366 271 292 8698887

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Authors
Hashimotodani, Y., Nasrallah, K., Jensen, K. R., Chávez, A. E., Carrera, D., & Castillo, P. E.
Affiliations
Albert Einstein College of Medicine (US)
Corresponding author
Castillo, Pablo E.
Venue
Neuron
Publisher
Elsevier BV
Published
2017-08
Volume
95
Issue
4
Pages
928-943.e3
ISSN
0896-6273 (ISSN-L)
OpenAlex
W2747342617
Cited by
104
References
77
Citations by year
2026: 5 · 2025: 9 · 2024: 21 · 2023: 17 · 2022: 15 · 2021: 13 · 2020: 8 · 2019: 5 · 2018: 9 · 2017: 2
FWCI
3.21
Type
journal article
Language
en
Open access
Locations
  • Neuron (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • NIH (DA017392, MH081935)
  • Japan Society for the Promotion of Science (H23.829)
  • Fondation pour la Recherche Médicale
  • Fondation Bettencourt Schueller
  • Ruth L. Kirschstein Award (F32 NS071821)
  • Brain & Behavior Research Foundation
  • Millennium Nucleus Nu-MIND (NC 130011)
  • Maximizing Access to Research Careers Program (T34 GM008718)
  • Albert Einstein College of Medicine (R25 GM104547)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
Keywords
long-term potentiation, dentate gyrus granule cells, excitation-inhibition balance, BDNF/TrkB signaling, cAMP/PKA signaling, presynaptic plasticity, feedforward inhibition, temporal lobe epilepsy, pattern separation
MeSH terms
Channelrhodopsins, Animals, Animals, Newborn, Enzyme Inhibitors, Female, Male, Mice, Transgenic, Nerve Tissue Proteins, Neurons, Synapses, Signal Transduction, Rats, Sprague-Dawley, Receptors, Presynaptic, Long-Term Potentiation, Neurotransmitter Agents, Dentate Gyrus, Brain-Derived Neurotrophic Factor, Mossy Fibers, Hippocampal, Receptor, trkB, Long-Term Synaptic Depression, Mice, Rats

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