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Local circuit amplification of spatial selectivity in the hippocampus
Single-cell tracing and optogenetics manipulation in mice are used to show how spatial tuning of individual pyramidal cells in CA1 can propagate to and be amplified by their local subnetwork of neurons.
- Tristan Geiller
- , Sadra Sadeh
- & Attila Losonczy
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Mechanical actions of dendritic-spine enlargement on presynaptic exocytosis
A mechanism of mechanosensation and transduction in the presynaptic boutons is identified, in which sensing of fine pressure leads to enhanced neurotransmitter release.
- Hasan Ucar
- , Satoshi Watanabe
- & Haruo Kasai
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eIF2α controls memory consolidation via excitatory and somatostatin neurons
Stimulation of de novo protein synthesis in both excitatory and inhibitory, somatostatin-expressing neurons in the mouse hippocampus enhances memory consolidation.
- Vijendra Sharma
- , Rapita Sood
- & Nahum Sonenberg
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Letter |
Reward behaviour is regulated by the strength of hippocampus–nucleus accumbens synapses
Dopamine-independent induction of long-term potentiation at hippocampal synapses onto the nucleus accumbens modulates reward-related behaviour.
- Tara A. LeGates
- , Mark D. Kvarta
- & Scott M. Thompson
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Hippocampal LTP and contextual learning require surface diffusion of AMPA receptors
Surface diffusion of AMPA receptors, from extra-synaptic to synaptic sites at the plasma membrane, is essential for full long-term potentiation in hippocampal neurons and for fear conditioning in living mice.
- A. C. Penn
- , C. L. Zhang
- & D. Choquet
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Postsynaptic synaptotagmins mediate AMPA receptor exocytosis during LTP
Postsynaptic synaptotagmin-1 and synaptotagmin-7 mediate calcium-dependent exocytosis of AMPA receptors during long-term potentiation.
- Dick Wu
- , Taulant Bacaj
- & Thomas C. Südhof
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Letter |
Autocrine BDNF–TrkB signalling within a single dendritic spine
Live fluorescent imaging of murine hippocampal slices shows that NMDAR-dependent glutamate signalling leads to postsynaptic BDNF release, with associated signalling of its receptor, TrkB, on the same dendritic spine, suggesting autocrine BDNF signalling.
- Stephen C. Harward
- , Nathan G. Hedrick
- & James O. McNamara
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Letter |
Rho GTPase complementation underlies BDNF-dependent homo- and heterosynaptic plasticity
The three small GTPases Rac1, RhoA and Cdc42 are differentially involved in structural long-term potentiation of rodent dendritic spines, simultaneously ensuring signal specificity and also priming the system for plasticity.
- Nathan G. Hedrick
- , Stephen C. Harward
- & Ryohei Yasuda
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Labelling and optical erasure of synaptic memory traces in the motor cortex
A new light-activated probe that targets recently active neuronal spines for manipulation induces shrinkage of recently potentiated spines following a motor learning task; spine shrinkage disrupted learning, suggesting a causal relationship between the specific subset of targeted spines and the learned behaviour.
- Akiko Hayashi-Takagi
- , Sho Yagishita
- & Haruo Kasai
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A circuit mechanism for differentiating positive and negative associations
Neurons in the basolateral amygdala projecting to canonical fear or reward circuits undergo opposing changes in synaptic strength following fear or reward conditioning, and selectively activating these projection-target-defined neural populations causes either negative or positive reinforcement, respectively.
- Praneeth Namburi
- , Anna Beyeler
- & Kay M. Tye
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Oxytocin enables maternal behaviour by balancing cortical inhibition
A study of pup retrieval behaviour in mice shows that oxytocin modulates cortical responses to pup calls specifically in the left auditory cortex; in virgin females, call-evoked responses were enhanced, thus increasing their salience, by pairing oxytocin delivery in the left auditory cortex with the calls, suggesting enhancement was a result of balancing the magnitude and timing of inhibition with excitation.
- Bianca J. Marlin
- , Mariela Mitre
- & Robert C. Froemke
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Branch-specific dendritic Ca2+ spikes cause persistent synaptic plasticity
Ca2+ spikes are generated on different dendritic branches in the primary motor cortex of mice performing different motor learning tasks, causing long-lasting potentiation of postsynaptic dendritic spines; inactivation of a population of interneurons disrupts the spatial separation of Ca2+ spikes and persistent dendritic spine potentiation, suggesting that the generation of Ca2+ spikes on different dendritic branches is crucial for storing information in individual neurons.
- Joseph Cichon
- & Wen-Biao Gan
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Letter |
Sensory-evoked LTP driven by dendritic plateau potentials in vivo
Whole-cell recordings in mouse somatosensory cortex in vivo show that rhythmic sensory-whisker stimulation induces long-term synaptic potentiation (LTP) in layer 2/3 (L2/3) pyramidal cells, in the absence of somatic spikes, through long-lasting NMDAR-mediated depolarizations that are generated by synaptic networks originating from the posteromedial complex of the thalamus.
- Frédéric Gambino
- , Stéphane Pagès
- & Anthony Holtmaat
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Letter |
Engineering a memory with LTD and LTP
A rodent study using optogenetics to induce long-term potentiation and long-term depression provides a causal link between synaptic plasticity and memory.
- Sadegh Nabavi
- , Rocky Fox
- & Roberto Malinow
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LTP requires a reserve pool of glutamate receptors independent of subunit type
The minimal possible requirement for AMPA receptor trafficking during long-term potentiation is explored, revealing that no region of the receptor subunit is necessary, in contrast with previous work; the only requirement for LTP seems to be a large reserve of glutamate receptors.
- Adam J. Granger
- , Yun Shi
- & Roger A. Nicoll