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Related Concept Videos

Long-term Potentiation01:25

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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
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Cholinergic Neurons: Neurotransmission01:23

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Cholinergic neurotransmission involves the synthesis and the release of acetylcholine (ACh) in order to transmit nerve impulses across the synapse. The process begins with the synthesis of acetyl CoA, a precursor for ACh, from ATP, acetate, and coenzyme A in the mitochondria. Choline, another vital precursor, is transported inside the neuron through choline transporters, including high-affinity choline transporter CHT1, low-affinity choline transporter CTL1, and lower-affinity choline...
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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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Cholinergic agonists or cholinomimetics mimic the action of acetylcholine to stimulate the parasympathetic nervous system. They are categorized into direct-acting and indirect-acting agents. The direct-acting cholinergic drugs induce the parasympathetic response by directly binding to the muscarinic or nicotine receptors. In comparison, the indirect-acting cholinergic drugs prevent acetylcholine hydrolysis, indirectly contributing to the extended parasympathetic response.
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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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Related Experiment Video

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Local Application of Drugs to Study Nicotinic Acetylcholine Receptor Function in Mouse Brain Slices
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Acetylcholine facilitates localized synaptic potentiation and location specific feature binding.

Yihao Yang1, Victoria Booth2, Michal Zochowski3

  • 1Department of Physics, University of Michigan, Ann Arbor, MI, United States.

Frontiers in Neural Circuits
|November 30, 2023
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Summary

Forebrain acetylcholine (ACh) signaling guides attention and learning. This study shows how spatially constrained ACh release shapes synaptic plasticity and network interactions, facilitating stimulus-induced learning.

Keywords:
STDPacetylcholinefeature bindingsynaptic plasticitysynaptic potentiation

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Systems Neuroscience

Background:

  • Forebrain acetylcholine (ACh) is crucial for attention and learning.
  • Recent findings highlight spatially and temporally constrained cholinergic signaling.
  • Investigating the mechanisms of stimulus-induced learning mediated by ACh is of significant interest.

Purpose of the Study:

  • To investigate how spatially constrained acetylcholine (ACh) signaling facilitates stimulus-induced learning.
  • To model the effects of ACh on synaptic potentiation and network interactions.
  • To explore the role of ACh in mediating spatially specific plasticity patterns.

Main Methods:

  • Utilized biophysical excitatory-inhibitory (E-I) multi-module neural network models.
  • Simulated ACh effects by modulating muscarinic receptor-regulated K+ current (m-current).
  • Employed spike-timing-dependent plasticity (STDP) for synaptic connection changes.

Main Results:

  • Spatially constrained ACh release reorganizes inter-module interactions by influencing information flow.
  • Network synchrony levels dictate the direction of synaptic plasticity (strengthening/weakening).
  • Activity in high ACh regions can induce feedback firing and specific synaptic modifications.

Conclusions:

  • Spatially constrained ACh release can mediate selective reorganization of neural network interactions.
  • The findings suggest a mechanism for how ACh contributes to learning and feature binding.
  • Cholinergic signaling plays a key role in shaping network dynamics for adaptive learning.