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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...
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: 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...
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.
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...

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Related Experiment Video

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Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane
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Stabilization of visual responses through cholinergic activation.

R Rodriguez1, U Kallenbach, W Singer

  • 1Department of Zoology, Systemic Animal Physiology, Faculty of Biology, TU Darmstadt, Schnittspahnstr 3, D-64287 Darmstadt, Germany.

Neuroscience
|November 7, 2009
PubMed
Summary

Cholinergic activation stabilizes neuronal responses by reducing spike count variability and enhancing gamma oscillations in the visual cortex. This suggests a mechanism for improving the reliability of sensory information transmission.

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Area of Science:

  • Neuroscience
  • Sensory Processing
  • Cholinergic Modulation

Background:

  • Neuronal processing transforms synaptic inputs into action potentials, with spike firing variability often viewed as noise.
  • However, response variability may encode information in systems where precise spike timing influences synaptic integration.
  • Acetylcholine is known to reduce spike-frequency adaptation and enhance gamma oscillations.

Purpose of the Study:

  • To investigate the influence of cholinergic modulation on spike count variability and gamma oscillations in sensory processing.
  • To determine if cholinergic activation impacts the reliability of neuronal transmission.

Main Methods:

  • Iontophoretic application of carbachol (a cholinergic agonist) in cat primary visual cortex.
  • Electrical stimulation of the mesencephalic reticular formation.
  • Analysis of visually induced responses, spike count variability, and gamma frequency oscillations.

Main Results:

  • Cholinergic activation significantly reduced spike count variability.
  • Stabilized gamma frequency oscillations (21–70 Hz) were observed in visually induced responses.
  • Response stabilization correlated with enhanced gamma oscillations, not average firing rates.

Conclusions:

  • Reduced spike count variability may enhance the reliability of neuronal transmission.
  • Cholinergic activation influences neuronal transmission efficacy by modulating precise spike timing.
  • This highlights a role for cholinergic systems in stabilizing sensory information processing.