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Direct-Acting Cholinergic Agonists: Pharmacokinetics01:31

Direct-Acting Cholinergic Agonists: Pharmacokinetics

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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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Glucagon-like Receptor Agonists01:24

Glucagon-like Receptor Agonists

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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.
GLP-1, when administered in high doses intravenously, triggers insulin secretion, inhibits glucagon release, slows gastric emptying, reduces food intake, and restores normal insulin secretion. However, its rapid inactivation by...
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Direct-Acting Cholinergic Agonists: Therapeutic Uses01:11

Direct-Acting Cholinergic Agonists: Therapeutic Uses

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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: Pharmacokinetics01:22

Indirect-Acting Cholinergic Agonists: Pharmacokinetics

1.6K
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.
Reversible agents containing quaternary amines, such as neostigmine and edrophonium, are not easily absorbed orally because they...
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Adrenergic Agonists: Direct-Acting Agents01:30

Adrenergic Agonists: Direct-Acting Agents

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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.
These agents can be classified...
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Adrenergic Agonists: Indirect-Acting Agents01:25

Adrenergic Agonists: Indirect-Acting Agents

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Indirect-acting adrenergic agonists potentiate the effects of endogenous catecholamines through different mechanisms without directly binding to adrenoceptors.
One mechanism involves depleting stored catecholamines by displacing them from synaptic vesicles. These agents, known as "displacers," are transported into vesicles at the expense of noradrenaline. Examples include amphetamine and tyramine, which lack a catechol moiety, resulting in prolonged action, improved oral...
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Assessment of Sexual Behavior of Male Mice
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短時間作用型および長時間作用型GLP-1受容体アゴニストは、経験豊富なげっ歯類におけるメスの性的行動を低下させる

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
PubMed
まとめ

グルカゴン様ペプチド-1受容体（GLP-1R）アゴニストは、メスの性的および社会的行動に影響を与え、その効果は薬剤および種によって異なります。これらの発見は、メスの報酬機能に対する種特異的およびアゴニスト特異的な影響を明らかにします。

キーワード:
ADDICTIONDopamineappetite-regulatory peptidesgut-brain peptides

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科学分野:

  • 神経科学;内分泌学;行動科学

背景:

  • グルカゴン様ペプチド-1受容体（GLP-1R）アゴニストは、代謝および報酬経路に影響を与えます。;以前の研究では、短期間作用型GLP-1Rアゴニストがオスの性的行動に影響を与えることが示されていますが、メスの反応は不明です。

研究 の 目的:

  • 長期間作用型（デュラグルチド、リラグルチド）および短期間作用型（エキセンジン-4）GLP-1Rアゴニストが、メスのラットおよびマウスの性的および社会的行動に及ぼす影響を調査すること。;これらの行動変化の根底にある可能性のある神経化学的メカニズムを探求すること。

主な方法:

  • 性的に経験豊富なメスのラットおよびマウスへのGLP-1Rアゴニスト（デュラグルチド、リラグルチド、エキセンジン-4）の投与。;確立された行動パラダイムを使用した性的行動（例：マウント、挿入、ロードーシス）および社会的行動（例：社会的新規性、社会性）の評価。;孤束核（NTS）および外側中隔（LS）における神経化学的変化の分析。

主要な成果:

  • GLP-1Rアゴニストはメスのラットおよびマウスにおける性的行動を低下させ、顕著な薬剤および種特異的な違いが見られました。;リラグルチドおよびデュラグルチドは、メスのマウスにおける社会的新規性行動を低下させ、社会性を増加させました。;神経化学的変化には、NTSにおけるノルアドレナリンの増加およびLSにおけるグルタミン酸、グルタミン、タウリンの変化が含まれていました。

結論:

  • GLP-1R活性化は、メスの性的および社会的行動に対して、種依存的およびアゴニスト特異的な効果を発揮します。;これらの発見は、代謝機能を超えた報酬関連行動の調節におけるGLP-1の役割の理解を広げます。