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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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Incretins include glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP), which stimulate insulin secretion post-meals. In type 2 diabetes, GIP's efficacy is reduced, making GLP-1 a viable drug target. GIP originates from preproGIP.
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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...
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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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Drugs that mimic the action of endogenous catecholamines like noradrenaline and adrenaline are called adrenergic agonists or sympathomimetics. Based on their mechanism of action, sympathomimetics can be classified as direct-, indirect-, or mixed-acting sympathomimetics. Direct-acting adrenergic agonists activate adrenoceptors without affecting presynaptic neurons, making them independent of neuronal catecholamine-depleting agents like reserpine and guanethidine.
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Adrenergic Agonists: Indirect-Acting Agents01:25

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Indirect-acting adrenergic agonists potentiate the effects of endogenous catecholamines through different mechanisms without directly binding to adrenoceptors.
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Assessment of Sexual Behavior of Male Mice
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Short- and long-acting GLP-1 receptor agonists decrease female sexual behaviors in experienced rodents.

Olesya Shevchouk1, Christian E Edvardsson1, Mia Ericson2

  • 1Institute of Neuroscience and Physiology, Department of Pharmacology, The Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden.

Behavioural Brain Research
|February 7, 2026
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Summary

Glucagon-like peptide-1 receptor (GLP-1R) agonists impact female sexual and social behaviors, with effects varying by drug and species. These findings reveal species-specific and agonist-specific impacts on female reward functions.

Keywords:
ADDICTIONAppetite-regulatory peptidesDopamineGut-brain peptides

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Behavioral Science

Background:

  • Glucagon-like peptide-1 receptor (GLP-1R) agonists influence metabolic and reward pathways.
  • Previous studies show short-acting GLP-1R agonists affect male sexual behavior, but female responses are unknown.

Purpose of the Study:

  • To investigate the effects of long-acting (dulaglutide, liraglutide) and short-acting (exendin-4) GLP-1R agonists on sexual and social behaviors in female rats and mice.
  • To explore potential neurochemical mechanisms underlying these behavioral changes.

Main Methods:

  • Administration of GLP-1R agonists (dulaglutide, liraglutide, exendin-4) to sexually experienced female rats and mice.
  • Assessment of sexual behaviors (e.g., mounts, intromissions, lordosis) and social behaviors (e.g., social novelty, sociability) using established behavioral paradigms.
  • Analysis of neurochemical changes in the nucleus tractus solitarii (NTS) and lateral septum (LS).

Main Results:

  • GLP-1R agonists decreased sexual behaviors in female rats and mice, with notable drug- and species-specific differences.
  • Liraglutide and dulaglutide reduced social novelty and increased sociability in female mice.
  • Neurochemical alterations included increased noradrenaline in the NTS and changes in glutamate, glutamine, and taurine in the LS.

Conclusions:

  • GLP-1R activation exerts species-dependent and agonist-specific effects on female sexual and social behaviors.
  • These findings expand the understanding of GLP-1's role in modulating reward-related behaviors beyond metabolic functions.