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Related Concept Videos

Indirect-Acting Cholinergic Agonists: Pharmacological Actions01:30

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Indirect-acting cholinergic agonists, also known as anticholinesterases, exert their pharmacological effects by enhancing cholinergic transmission in various body parts, including the neuromuscular junction, autonomic cholinergic synapses, and the brain.
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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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Indirect-Acting Cholinergic Agonists: Mechanism of Action01:18

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Indirect-acting cholinergic agonists work by interacting with an enzyme called acetylcholinesterase (AChE) in the synaptic cleft. They can be reversible or irreversible inhibitors and have different effects on the enzyme.
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Parasympathetic signaling plays a crucial role in regulating various physiological processes. It involves the release of acetylcholine (ACh) by parasympathetic neurons, which can have localized and short-lived effects. The majority of ACh released is rapidly inactivated at the synapse by the enzyme acetylcholinesterase (AChE), which hydrolyzes Ach into choline and acetate. Additionally, the tissue cholinesterase deactivates any ACh diffusing into the surrounding tissues.
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Cholinergic Behavior State-Dependent Mechanisms of Neocortical Gain Control: a Neurocomputational Study.

J-Y Puigbò1,2, G Maffei1,2, I Herreros1,2

  • 1SPECS, DTIC, Universitat Pompeu Fabra, Carrer Roc Boronat 138, 08018, Barcelona, Spain.

Molecular Neurobiology
|October 2, 2017
PubMed
Summary

The mammalian brain adapts to the world using the neocortex, modulated by subcortical systems. This model explains how the amygdala and acetylcholine regulate inhibitory interneurons for adaptive sensory learning and attention.

Keywords:
AcetylcholineInhibitory networkNeocortical circuitsNeuromodulation

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Cognitive Science

Background:

  • The mammalian brain's adaptation relies on neocortical processing modulated by subcortical structures like the amygdala.
  • Classical conditioning demonstrates how sensory information is associated with behavioral responses, involving feature detection and state-dependent modulation.

Purpose of the Study:

  • To present a computational model of neocortical systems involved in adaptive feature detection.
  • To analyze the role of inhibitory interneurons and amygdala-mediated modulation in regulating cortical activity and sensory gating.

Main Methods:

  • Developed a computational model of neocortical systems.
  • Analyzed the dynamics of inhibitory interneuron populations.
  • Investigated the role of acetylcholine (ACh) in modulating neural activity and sensory signal gating.

Main Results:

  • The model demonstrates state-dependent modulation of cortical activity by the amygdala and nucleus basalis of Meynert.
  • Showcased the distinct roles of different inhibitory interneuron populations in regulating cortical activity.
  • Revealed that ACh, controlled by the amygdala, influences interneuron dynamics to facilitate novel sensory feature detection.

Conclusions:

  • The computational model elucidates the mechanisms underlying adaptive feature selection and state-dependent learning.
  • Highlights the critical role of amygdala-mediated acetylcholine signaling in regulating attention and learning modes.
  • Suggests that inhibitory interneuron dynamics are key to adjusting cortical representations and processing novel sensory information.