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Related Concept Videos

Long-term Potentiation01:25

Long-term Potentiation

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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Hebbian LTP
LTP can occur when...
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Long-term Potentiation01:35

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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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Excitatory and Inhibitory Effects of Neurotransmitters01:29

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When an action potential reaches the presynaptic axon terminal, it releases neurotransmitters from the neuron into the synaptic cleft at a chemical synapse. The released neurotransmitter can be excitatory or inhibitory. The critical criteria commonly used to determine whether a molecule is a neurotransmitter at a chemical synapse are the molecule's presence in the presynaptic neuron. Second, its release is in response to strong presynaptic depolarization. And lastly, the presence of...
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Integration of Synaptic Events01:28

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Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
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Chemical Synapses01:26

Chemical Synapses

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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
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Related Experiment Video

Updated: Mar 8, 2026

Improved Preparation and Preservation of Hippocampal Mouse Slices for a Very Stable and Reproducible Recording of Long-term Potentiation
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Adrenergic Gate Release for Spike Timing-Dependent Synaptic Potentiation.

Yanling Liu1, Lei Cui2, Martin K Schwarz3

  • 1Department of Psychiatry and Psychotherapy, University Medical Center, D-37075 Göttingen, Germany.

Neuron
|January 20, 2017
PubMed
Summary

Adrenergic signaling enhances associative learning by activating β2-adrenoceptors, which inactivate Kv1.1 channels. This increases dendrite excitability, promoting synaptic plasticity and memory encoding.

Keywords:
Kv1.1SAP97dendritic excitabilityhippocampussignaling scaffoldspike timing-dependent plasticityβ-adrenoceptor

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Fast Micro-iontophoresis of Glutamate and GABA: A Useful Tool to Investigate Synaptic Integration
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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Synaptic Plasticity

Background:

  • Spike-timing-dependent synaptic plasticity (STDP) is crucial for associative learning.
  • Elevated attention and emotion activate adrenergic signaling, enhancing STDP.
  • Mechanisms of adrenergic modulation of dendrite excitability are not fully understood.

Purpose of the Study:

  • To elucidate the cellular mechanisms by which adrenergic signaling enhances synaptic plasticity.
  • To investigate the role of β2-adrenoceptors and Kv1.1 channels in this process.
  • To identify the molecular players involved in adrenergic modulation of synaptic plasticity.

Main Methods:

  • Electrophysiological recordings in mouse hippocampal slices.
  • Pharmacological activation of β2-adrenoceptors.
  • Immunochemical analysis of Kv1.1 channel localization and SAP97 interaction.
  • Genetic manipulation of SAP97 function.

Main Results:

  • Activation of β2-adrenoceptors promoted long-term potentiation at hippocampal synapses.
  • This potentiation was mediated by the inactivation of dendritic Kv1.1 channels.
  • Inactivation of Kv1.1 channels increased dendrite excitability and facilitated synaptic plasticity.
  • The signaling scaffold SAP97 was identified as a key mediator, escorting β2 signaling to remove Kv1.1 from the dendrite surface.

Conclusions:

  • Adrenergic signaling enhances synaptic plasticity by modulating Kv1.1 channel activity via SAP97.
  • This mechanism links arousal states to synaptic plasticity and memory encoding.
  • Postsynaptic signaling scaffolds play a critical role in bridging brain states and synaptic function.