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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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Evaluation of Synaptic Multiplicity Using Whole-cell Patch-clamp Electrophysiology
10:52

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Published on: April 23, 2019

A dynamical role for acetylcholine in synaptic renormalization.

Christian G Fink1, Geoffrey G Murphy, Michal Zochowski

  • 1Department of Physics, University of Michigan, Ann Arbor, Michigan, USA. cgfink@owu.edu

Plos Computational Biology
|March 22, 2013
PubMed
Summary
This summary is machine-generated.

This study proposes acetylcholine as a mechanism for synaptic renormalization during sleep. Cholinergic changes in neuronal excitability dynamically regulate synaptic potentiation, explaining sleep-dependent synaptic downscaling.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Systems Neuroscience

Background:

  • The function of sleep remains largely unknown across animal species.
  • The synaptic renormalization hypothesis posits sleep is essential for counteracting synaptic potentiation during wakefulness.
  • Experimental evidence supports sleep-dependent synaptic downscaling, but underlying mechanisms are unclear.

Purpose of the Study:

  • To investigate the role of acetylcholine in synaptic plasticity and renormalization.
  • To propose a dynamical mechanism for wake-dependent synaptic upscaling and sleep-dependent downscaling.
  • To explore how cholinergic modulation of neuronal excitability influences network synaptic potentiation.

Main Methods:

  • In silico modeling of neuronal networks.
  • Simulation of spike-timing dependent plasticity (STDP) mechanisms.
  • Analysis of network firing patterns and synaptic strength changes under varying cholinergic concentrations.

Main Results:

  • Cholinergically-induced changes in neuronal membrane excitability dynamically alter network synaptic potentiation.
  • High acetylcholine levels correlate with increased network synaptic potentiation, while low levels correlate with decreased potentiation.
  • The proposed mechanism demonstrates robustness across various network parameters.

Conclusions:

  • Acetylcholine-induced changes in neuronal excitability offer a potential dynamical mechanism for synaptic renormalization during sleep.
  • This mechanism can explain both synaptic potentiation during wakefulness and downscaling during sleep.
  • The findings provide a novel insight into the physiological underpinnings of sleep's role in synaptic plasticity.