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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...
Adrenergic Receptors: ɑ Subtype01:31

Adrenergic Receptors: ɑ Subtype

Adrenoceptors are classified into α and ꞵ classes based on their potencies to catecholamine agonists. α-adrenoceptors show the following order of catecholamine potency:
Adrenaline ≥ Noradrenaline >> Isoprenaline
α-adrenoceptors are further divided into α1 and α2-adrenoceptors.
α1-Adrenoceptors: These receptors are located postsynaptically on the effector organs and cause constriction of smooth muscle mediated by activation of phospholipase C—inositol-1,4,5-trisphosphate...
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...
Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions01:27

Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions

Nondepolarizing neuromuscular blockers prevent the membrane depolarization of muscle cells and inhibit muscle contraction. These are usually administered with anesthetics to achieve complete muscle relaxation. Upon administration, these drugs first block the small, rapidly contracting muscles of the face and hands, followed by the larger muscles of the trunk and the intercostal muscles. The diaphragm is the last muscle to be affected.
Although all competitive neuromuscular blockers are designed...
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...
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.

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Related Experiment Video

Updated: May 15, 2026

Assessing Changes in Volatile General Anesthetic Sensitivity of Mice after Local or Systemic Pharmacological Intervention
08:49

Assessing Changes in Volatile General Anesthetic Sensitivity of Mice after Local or Systemic Pharmacological Intervention

Published on: October 16, 2013

Adenosine A(1) receptors in mouse pontine reticular formation depress breathing, increase anesthesia recovery time,

George C Gettys1, Fang Liu, Ed Kimlin

  • 1Department of Anesthesiology, University of Michigan, Ann Arbor, MI 48109-5615, USA.

Anesthesiology
|December 25, 2012
PubMed
Summary

Adenosine A1 receptors in the pontine reticular formation (PRF) regulate breathing and arousal. This adenosinergic-cholinergic interaction in the PRF is key to the wakefulness stimulus for breathing.

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Last Updated: May 15, 2026

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Published on: October 16, 2013

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Published on: April 13, 2010

Area of Science:

  • Neuroscience
  • Pharmacology
  • Respiratory Physiology

Background:

  • Adenosine is known for its analgesic effects.
  • Central adenosine agonists suppress arousal and breathing via unclear mechanisms.
  • Adenosine A1 receptors in the pontine reticular formation (PRF) were investigated for their role in modulating breathing, arousal, and acetylcholine release.

Purpose of the Study:

  • To test the hypothesis that adenosine A1 receptors in the PRF modulate breathing, behavioral arousal, and acetylcholine release.
  • To elucidate the neurochemical mechanisms underlying the wakefulness stimulus for breathing.

Main Methods:

  • Experiments involved microinjections into the PRF of C57BL/6J mice.
  • Breathing was measured using plethysmography.
  • Recovery of righting response (RoRR) and acetylcholine release were quantified following agonist/antagonist administration.

Main Results:

  • Adenosine A1 receptor agonist (SPA) decreased respiratory rate, tidal volume, and minute ventilation.
  • SPA concentration significantly influenced RoRR, acetylcholine release, and breathing rate.
  • Antagonist (1,3-dipropyl-8-cyclopentylxanthine) increased acetylcholine and decreased RoRR and breathing rate, effects blocked by SPA coadministration.

Conclusions:

  • Endogenous adenosine acting on PRF A1 receptors modulates breathing, arousal, and acetylcholine release.
  • An adenosinergic-cholinergic interaction within the PRF is a neurochemical mechanism for the wakefulness stimulus for breathing.