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Related Concept Videos

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...
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...
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: Therapeutic Uses01:11

Direct-Acting Cholinergic Agonists: Therapeutic Uses

Direct-acting cholinergic agonists have many therapeutic uses in various medical fields. Choline esters, including acetylcholine, have limited clinical utility due to their non-selectivity and short duration of action. Still, acetylcholine and carbachol are applied topically during ophthalmologic surgery to induce miosis. Pilocarpine, a muscarinic and ganglionic stimulator, effectively treats open-angle glaucoma and alleviates xerostomia and dry mouth caused by radiotherapy or Sjögren syndrome.
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 2, 2026

Simultaneous Detection of c-Fos Activation from Mesolimbic and Mesocortical Dopamine Reward Sites Following Naive Sugar and Fat Ingestion in Rats
08:07

Simultaneous Detection of c-Fos Activation from Mesolimbic and Mesocortical Dopamine Reward Sites Following Naive Sugar and Fat Ingestion in Rats

Published on: August 24, 2016

Cholinergic modulation of mesolimbic dopamine function and reward.

Gregory P Mark1, Shkelzen Shabani, Lauren K Dobbs

  • 1Department of Behavioral Neuroscience, Oregon Health & Science University, School of Medicine, Portland, OR 97239, United States. markg@ohsu.edu

Physiology & Behavior
|May 10, 2011
PubMed
Summary

Central cholinergic systems modulate dopamine pathways, influencing motivated behaviors like addiction and binge eating. Understanding these interactions is key for developing treatments for compulsive behaviors.

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Area of Science:

  • Neurobiology
  • Neurochemistry
  • Behavioral Neuroscience

Background:

  • Obesity and compulsive drug use pose significant health risks, necessitating research into their neurobiological underpinnings.
  • While dopamine's role in addiction and compulsive behaviors is known, the neurochemical systems modulating it remain incompletely understood.

Purpose of the Study:

  • To investigate the role of central cholinergic systems in motivated behaviors, particularly those related to natural and drug rewards.
  • To highlight the interaction between cholinergic and dopaminergic systems in the context of addiction and compulsive behaviors.

Main Methods:

  • Review of existing research on neurochemical systems, focusing on cholinergic and dopaminergic interactions.
  • Analysis of evidence implicating cholinergic pathways in modulating dopamine activity in reward circuits.

Main Results:

  • Cholinergic pathways interact with dopamine systems at multiple levels of the reward circuit.
  • Cholinergic cells in the pons project to the ventral tegmental area (VTA) and substantial nigra (SN), modulating dopaminergic neuron activity.
  • Cholinergic interneurons in the nucleus accumbens (NAc) extensively interact with other neurons and afferents, suggesting a role in gating motivational information.

Conclusions:

  • Central nervous system (CNS) cholinergic systems play a pivotal role in behaviors motivated by both natural and drug rewards.
  • Cholinergic systems are crucial for gating information flow related to the motivational value of stimuli within the mesolimbic system.
  • Future research and therapeutic strategies for compulsive behaviors must consider the involvement of central cholinergic systems.