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Hippocampal 5-HT Input Regulates Memory Formation and Schaffer Collateral Excitation
Catia M Teixeira1, Zev B Rosen2, Deepika Suri3
1Department of Psychiatry, Columbia University, New York, NY 10032, USA; New York State Psychiatric Institute, New York, NY 10032, USA; Emotional Brain Institute, Nathan Kline Institute, Orangeburg, NY 10962, USA.
Neuron
|May 15, 2018
Summary
Serotonin (5-HT) release in the hippocampus enhances spatial memory by strengthening synaptic connections. Modulating serotonin 4 (5-HT4) receptors bidirectionally impacts memory formation, revealing the neurotransmitter
Area of Science:
- Neuroscience
- Molecular Biology
- Cognitive Science
Background:
- Neuromodulators regulate memory storage.
- Serotonin (5-HT) is crucial for implicit memory in invertebrates but its role in mammalian explicit memory is unclear.
- The impact of endogenous 5-HT release gradients on memory is unknown.
Purpose of the Study:
- To investigate the role of endogenous serotonin (5-HT) in hippocampal explicit memory formation.
- To elucidate the mechanisms by which 5-HT influences synaptic plasticity and spatial memory in the hippocampus.
- To determine the specific receptors involved in 5-HT-mediated memory modulation.
Main Methods:
- Optogenetic activation and silencing of serotonergic terminals in the hippocampal CA1 region of mice.
- Electrophysiological recordings to assess excitatory transmission at CA3-to-CA1 synapses.
- Behavioral testing to evaluate spatial memory performance.
Main Results:
- Activation of CA1 5-HT terminals potentiated CA3-to-CA1 synaptic transmission and enhanced spatial memory.
- Optogenetic silencing of CA1 5-HT terminals impaired spatial memory.
- Synaptic potentiation was mediated by serotonin 4 (5-HT4) receptors.
- Systemic modulation of 5-HT4 receptor function bidirectionally affected memory formation.
Conclusions:
- Endogenous serotonin release in the hippocampus exerts a powerful modulatory influence on synaptic function and memory.
- Serotonergic input to the CA1 region is critical for hippocampal-dependent explicit memory.
- Serotonin 4 (5-HT4) receptors are key mediators of 5-HT's effects on synaptic plasticity and memory.
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