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Related Concept Videos

Indirect-Acting Cholinergic Agonists: Pharmacological Actions01:30

Indirect-Acting Cholinergic Agonists: Pharmacological Actions

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...
Direct-Acting Cholinergic Agonists: Pharmacological Actions00:59

Direct-Acting Cholinergic Agonists: Pharmacological Actions

Direct-acting cholinergic agonists exert their pharmacological actions by mimicking the effects of acetylcholine on postsynaptic muscarinic receptors to generate parasympathetic responses. These agents elicit a range of physiological responses, including cardiovascular effects. For example, activation of muscarinic receptors induces bradycardia, decreased cardiac output, reduced peripheral resistance, and consequent hypotension. In the eye, stimulation of M3 receptors leads to smooth muscle...
Cholinergic Antagonists: Pharmacological Actions01:28

Cholinergic Antagonists: Pharmacological Actions

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:
Gastrointestinal Effects: Antimuscarinics reduce gut contractions, increase gastric emptying, and slow intestinal transit. They partly inhibit gastric acid secretion...
Direct-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship01:22

Direct-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship

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.
The direct-acting...
Indirect-Acting Cholinergic Agonists: Mechanism of Action01:18

Indirect-Acting Cholinergic Agonists: Mechanism of Action

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.
Reversible inhibitors like edrophonium bind to a specific part of the enzyme called the anionic catalytic site. They form noncovalent bonds, which means they are not strongly attached to the enzyme. This creates a temporary and less stable enzyme–inhibitor complex, leading to...
Direct-Acting Cholinergic Agonists: Pharmacokinetics01:31

Direct-Acting Cholinergic Agonists: Pharmacokinetics

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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Related Experiment Video

Updated: Jun 17, 2026

A Computerized Test Battery to Study Pharmacodynamic Effects on the Central Nervous System of Cholinergic Drugs in Early Phase Drug Development
07:02

A Computerized Test Battery to Study Pharmacodynamic Effects on the Central Nervous System of Cholinergic Drugs in Early Phase Drug Development

Published on: February 11, 2019

Cholinergic systems mediate action from movement to higher consciousness.

Nancy J Woolf1, Larry L Butcher

  • 1Behavioral Neuroscience, Department of Psychology, University of California, Los Angeles, CA 90095-1563, United States. nwoolf@ucla.edu

Behavioural Brain Research
|January 12, 2010
PubMed
Summary

Cholinergic systems control both physical actions and consciousness. This review explores how acetylcholine influences intracellular cytoskeletal mechanisms, impacting muscle and brain functions vital for cognition.

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Last Updated: Jun 17, 2026

A Computerized Test Battery to Study Pharmacodynamic Effects on the Central Nervous System of Cholinergic Drugs in Early Phase Drug Development
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Published on: February 11, 2019

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Area of Science:

  • Neuroscience
  • Cell Biology

Background:

  • Cholinergic neurotransmitter systems are crucial for both overt motor behaviors and covert cognitive functions like attention and memory.
  • Existing models often focus on neural circuitry, overlooking intracellular mechanisms.

Purpose of the Study:

  • To review the fundamental link between cholinergic function and intracellular cytoskeletal mechanisms.
  • To explore the implications of these mechanisms for higher cognition.

Main Methods:

  • Review of existing literature on cholinergic systems, cytoskeleton, and cognition.
  • Analysis of intracellular signaling pathways involving acetylcholine, nicotinic, and muscarinic receptors.

Main Results:

  • Cholinergic signaling impacts cytoskeletal proteins (actin, microtubules) in both muscle and central nervous system targets.
  • These intracellular effects are fundamental to both muscle contraction and neuroplasticity underlying cognition.

Conclusions:

  • Cholinergic involvement in cognition extends beyond neural networks to intracellular cytoskeletal dynamics.
  • Understanding these mechanisms offers new insights into the neurobiology of consciousness and cognitive processes.