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Related Concept Videos

Cholinesterases: Distribution and Function01:22

Cholinesterases: Distribution and Function

638
Cholinesterases are a group of serine hydrolase enzymes that play a crucial role in the breakdown of choline esters. The two primary types of cholinesterases are acetylcholinesterases (AChEs) and butyrylcholinesterase (BuChEs), which differ in their distribution, function, and substrate specificity. AChEs, also known as true cholinesterases, specifically hydrolyze acetylcholine, while BuChEs, often referred to as pseudocholinesterases, can hydrolyze various choline esters, including...
638
Anticholinesterase Agents: Poisoning and Treatment01:26

Anticholinesterase Agents: Poisoning and Treatment

1.1K
Anticholinesterases, also known as cholinesterase inhibitors, work by blocking the breakdown of acetylcholine, leading to its accumulation in the synaptic cleft. This accumulation indirectly enhances both muscarinic and nicotinic actions. These agents are classified as reversible or irreversible based on their mechanism of action.     
Irreversible agents form a strong bond with the cholinesterase enzyme, making it inactive. The breakdown of the phosphorylated enzyme is...
1.1K
Indirect-Acting Cholinergic Agonists: Pharmacokinetics01:22

Indirect-Acting Cholinergic Agonists: Pharmacokinetics

1.2K
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...
1.2K
Indirect-Acting Cholinergic Agonists: Mechanism of Action01:18

Indirect-Acting Cholinergic Agonists: Mechanism of Action

2.1K
Indirect-acting cholinergic agonists work by interacting with an enzyme called acetylcholinesterase (AChE) in the synaptic cleft. They can be reversible or irreversible inhibitors and have different effects on the enzyme.
Reversible inhibitors like edrophonium bind to a specific part of the enzyme called the anionic catalytic site. They form noncovalent bonds, which means they are not strongly attached to the enzyme. This creates a temporary and less stable enzyme–inhibitor complex,...
2.1K
Indirect-Acting Cholinergic Agonists: Pharmacological Actions01:30

Indirect-Acting Cholinergic Agonists: Pharmacological Actions

996
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...
996
Direct-Acting Cholinergic Agonists: Pharmacokinetics01:31

Direct-Acting Cholinergic Agonists: Pharmacokinetics

1.4K
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...
1.4K

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Related Experiment Video

Updated: Oct 22, 2025

Measurement of Chitinase Activity in Biological Samples
03:32

Measurement of Chitinase Activity in Biological Samples

Published on: August 22, 2019

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Cholinesterase Research.

Jan Korabecny1,2, Ondrej Soukup1,2

  • 1Biomedical Research Center, University Hospital Hradec Kralove, Sokolska 581, 500 05 Hradec Kralove, Czech Republic.

Biomolecules
|August 27, 2021
PubMed
Summary

Cholinesterases are crucial enzymes in the nervous system. Their inhibition impacts neurotransmission, affecting various physiological functions.

Area of Science:

  • Biochemistry
  • Neuroscience
  • Enzymology

Background:

  • Cholinesterases are key enzymes regulating neurotransmission.
  • They are targets for therapeutic interventions and toxic agents.

Discussion:

  • Enzyme kinetics and inhibition mechanisms are vital for understanding cholinesterase function.
  • Structure-activity relationships guide the design of selective inhibitors.

Key Insights:

  • Cholinesterase activity is essential for proper nerve signal transmission.
  • Modulating cholinesterase activity has significant therapeutic and toxicological implications.

Outlook:

  • Further research into cholinesterase inhibitors could yield novel treatments.

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  • Understanding cholinesterase's role is critical for neurodegenerative disease research.