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Related Concept Videos

Direct-Acting Cholinergic Agonists: Pharmacokinetics01:31

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Direct-acting cholinergic agonists, such as synthetic choline esters and naturally occurring alkaloids, exert their effects by enhancing the actions of acetylcholine and stimulating the parasympathetic nervous system. Synthetic choline esters share structural similarities with acetylcholine. For example, they have a positively charged quaternary ammonium or onium group, contributing to their hydrophilic characteristics. As a result, they are poorly absorbed in the body through oral...
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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.
At the neuromuscular junction, these agents work by inhibiting the breakdown of acetylcholine, allowing it to remain bound to the receptor and bind to nearby receptors. This process leads to repetitive firing of the endplate, causing muscle...
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Cholinergic Receptors: Muscarinic01:25

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The pharmacological actions of acetylcholine are elicited via its binding to two families of cholinergic receptors or cholinoceptors, namely, muscarinic and nicotinic receptors. Muscarinic receptors are G protein-coupled receptors and have five subtypes, M1–M5. All mAChR subtypes are activated by acetylcholine and blocked by the antagonist, atropine. 
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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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Cholinergic Antagonists: Pharmacological Actions01:28

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Antimuscarinic drugs block muscarinic receptors in multiple systems, including the gut, eye, smooth muscles, respiratory tract, cardiovascular, and central nervous systems. They produce similar effects with varying selectivity depending on the specific agent and tissue. Here are the key pharmacological actions of antimuscarinics:
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Indirect-acting cholinergic agonists, or anticholinesterases, enhance the body's cholinergic activity by inhibiting acetylcholine's breakdown. They are categorized as reversible or irreversible agents based on their mechanism of action. They are further classified into short-acting, intermediate-acting, and long-acting agents based on their duration of action.
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Updated: Dec 19, 2025

Author Spotlight: Investigating the Impact of Aging on Hippocampal-Dependent Spatial Learning
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The cholinergic system and spatial learning.

Serena Deiana1, Bettina Platt, Gernot Riedel

  • 1School of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD, Scotland, United Kingdom.

Behavioural Brain Research
|November 27, 2010
PubMed
Summary
This summary is machine-generated.

Acetylcholine (ACh) plays a vital role in memory formation, with distinct patterns of activity during learning and consolidation. While essential for cognitive functions, current evidence does not support specific ACh receptor subtypes as novel therapeutic targets.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Pharmacology

Background:

  • Acetylcholine (ACh) is crucial for central nervous system functions, particularly memory.
  • This review focuses on the cholinergic system's role in human declarative memory and rodent episodic-like memory.

Purpose of the Study:

  • To review the current understanding of the cholinergic system in memory formation.
  • To highlight the differential roles of ACh in various memory processes and identify potential therapeutic targets.

Main Methods:

  • Literature review of studies on acetylcholine and memory.
  • Analysis of experimental data on cholinergic activity during spatial learning, working memory, and behavioral flexibility.

Main Results:

  • ACh efflux is high during spatial acquisition but low during consolidation.
  • Cholinergic activity in the nucleus basalis–prefrontal cortex is linked to working memory.
  • Striatal cholinergic activity is involved in stimulus-response learning and behavioral flexibility.
  • Both muscarinic and nicotinic receptor antagonists impair memory, while agonists can reverse deficits or enhance attention.

Conclusions:

  • ACh dynamics are critical for different memory phases, with specific regional involvement.
  • Current data do not conclusively identify muscarinic or nicotinic receptors as novel therapeutic targets for memory disorders.
  • Further research is needed to clarify the role of cholinergic systems and identify reliable biomarkers for translational medicine.