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Related Concept Videos

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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Direct-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship01:22

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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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Indirect-Acting Cholinergic Agonists: Pharmacokinetics01:22

Indirect-Acting Cholinergic Agonists: Pharmacokinetics

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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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Cholinergic Receptors: Muscarinic01:25

Cholinergic Receptors: Muscarinic

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The pharmacological actions of acetylcholine are elicited via its binding to two families of cholinergic receptors or cholinoceptors, namely, muscarinic and nicotinic receptors. Muscarinic receptors are G protein-coupled receptors and have five subtypes, M1–M5. All mAChR subtypes are activated by acetylcholine and blocked by the antagonist, atropine. 
The subtypes M1, M3, and M5 couple with the Gq subunit and activate the phospholipase C (PLC) activity, mobilizing intracellular Ca2+....
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Indirect-Acting Cholinergic Agonists: Pharmacological Actions01:30

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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...
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Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship01:29

Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship

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Indirect-acting cholinergic agonists are agents that interact with the acetylcholinesterase enzyme in the synaptic cleft, preventing the breakdown of acetylcholine into choline and acetate. Consequently, the concentration of acetylcholine in the synaptic cleft increases. These agonists can be classified into reversible and irreversible inhibitors based on their duration of action.
Reversible inhibitors display short to medium durations of action. Short-acting agents include simple alcohols with...
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Related Experiment Video

Updated: Aug 25, 2025

Novel Object Recognition Test for the Investigation of Learning and Memory in Mice
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Cholinergic regulation of object recognition memory.

Kana Okada1, Kouichi Hashimoto1, Kazuto Kobayashi2

  • 1Department of Neurophysiology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan.

Frontiers in Behavioral Neuroscience
|October 17, 2022
PubMed
Summary
This summary is machine-generated.

Object recognition memory is crucial for identifying objects and is impaired in diseases like Alzheimer's. The central cholinergic system plays a key role in this memory, with specific pathways linked to different aspects of object recall.

Keywords:
basal forebraincholinergic systemhippocampusmuscarinic receptornicotinic receptorperirhinal cortex

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Memory Research

Background:

  • Object recognition memory is fundamental for identifying and recalling object features.
  • This memory is studied across species to understand mammalian memory and diagnose neurological diseases like Alzheimer's and Parkinson's.
  • Early-stage Alzheimer's disease is linked to cholinergic cell loss and impaired recognition memory, highlighting the central cholinergic system's importance.

Purpose of the Study:

  • To investigate the neural mechanisms underlying object recognition memory.
  • To explore the role of the central cholinergic system in different types of object recognition memory.
  • To clarify the neuronal basis of recognition memory and inform dementia treatment strategies.

Main Methods:

  • Review of existing literature on object recognition memory and the cholinergic system.
  • Analysis of studies investigating cholinergic projections and their impact on memory recall in rodents.
  • Examination of experimental data from rodent models of Alzheimer's disease.

Main Results:

  • Cholinergic neurons in the medial septum and ventral diagonal band of Broca are critical for object location memory.
  • Cholinergic projections from the nucleus basalis magnocellularis are associated with object identification memory.
  • Specific brain regions like the perirhinal and prefrontal cortex, receiving cholinergic input, are involved in object-in-place and recency memory.

Conclusions:

  • Distinct cholinergic cell groups regulate various forms of object recognition memory.
  • Neurodegeneration in the central cholinergic system leads to deficits in object recognition memory, as seen in Alzheimer's models.
  • Understanding these cholinergic pathways is essential for developing effective therapeutic treatments for dementia.