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Indirect-Acting Cholinergic Agonists: Pharmacological Actions

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...

Anticholinesterase Agents: Poisoning and Treatment

Anticholinesterase Agents: Poisoning and Treatment

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 slower than the...

Indirect-Acting Cholinergic Agonists: Mechanism of Action

Indirect-Acting Cholinergic Agonists: Mechanism of Action

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, leading to...

Cognitive Enhancers: Cholinesterase Inhibitors and NMDA Receptor Antagonists

Cognitive Enhancers: Cholinesterase Inhibitors and NMDA Receptor Antagonists

Cognitive enhancers, also known as "smart drugs," are substances used to enhance memory, mental alertness, and concentration. These can be natural or synthetic and improve cognition in conditions like Alzheimer's disease (AD) and other neurodegenerative diseases. Some common examples include caffeine, amphetamines, methylphenidate, modafinil, arecoline, donepezil, vortioxetine, and piracetam. These enhancers work on the principle of synaptic plasticity and altered circuit function. They...

Direct-Acting Cholinergic Agonists: Pharmacokinetics

Direct-Acting Cholinergic Agonists: Pharmacokinetics

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...

Indirect-Acting Cholinergic Agonists: Pharmacokinetics

Indirect-Acting Cholinergic Agonists: Pharmacokinetics

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 are...

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Can cholinesterase inhibitors affect neural development?

Stephen Brimijoin¹

¹Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, 200 First Street, S.W., Rochester, MN 55905, USA.

Environmental Toxicology and Pharmacology

|July 26, 2011

Summary

Cholinesterase inhibitors may impact nerve cell development by affecting acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) functions. These enzymes influence neurite outgrowth and cell survival, with implications for neurotoxicology.

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A Computerized Test Battery to Study Pharmacodynamic Effects on the Central Nervous System of Cholinergic Drugs in Early Phase Drug Development

Published on: February 11, 2019

Area of Science:

Neuroscience
Toxicology
Biochemistry

Background:

Acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) are known to influence nerve cell proliferation and differentiation.
AChE's role in promoting neurite outgrowth, potentially as an adhesion molecule, suggests cholinesterase inhibitors could disrupt neuronal development.

Purpose of the Study:

To explore the complex mechanisms by which cholinesterase inhibitors may affect neuronal development.
To highlight the significance of anticholinesterase agents in the field of developmental neurotoxicology.

Main Methods:

Review of accumulating evidence on cholinesterase activity and neuronal development.
Analysis of potential protein-protein interactions and ligand influences on AChE function.
Consideration of additional mechanisms of anticholinesterase agents on developing brain cells.

Main Results:

AChE's influence on neurite outgrowth may involve non-catalytic, structural interactions, possibly at the peripheral anionic site.
Some organophosphorus anticholinesterases can depress macromolecule synthesis and cell survival in the developing brain.
The effects of cholinesterase inhibitors on neuronal development are complex and not solely related to catalytic inhibition.

Conclusions:

Cholinesterase inhibitors have the potential to disturb neuronal development, impacting both central and peripheral nervous systems.
Understanding these complex interactions is crucial for assessing the developmental neurotoxicology of anticholinesterase agents.