Related Experiment Video
Updated: May 15, 2026
10:26
Bladder Smooth Muscle Strip Contractility as a Method to Evaluate Lower Urinary Tract Pharmacology
Published on: August 18, 2014
Butyrylcholinesterase and the cholinergic system
G A Reid1, N Chilukuri, S Darvesh
1Department of Medical Neuroscience Dalhousie University, Halifax, Nova Scotia, Canada.
Neuroscience
|January 12, 2013
Summary
Butyrylcholinesterase (BuChE) is found in the central nervous system (CNS) alongside choline acetyltransferase (ChAT), suggesting a role in regulating acetylcholine. This study maps BuChE distribution in the mouse CNS, revealing its association with cholinergic neurons.
Area of Science:
- Neuroscience
- Neurochemistry
- Enzymology
Background:
- The cholinergic system is crucial for neurotransmission in the central and peripheral nervous systems.
- Acetylcholine synthesis is by choline acetyltransferase (ChAT), and its breakdown by acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE).
- While AChE has been extensively studied, the role of BuChE in cholinergic regulation is increasingly recognized.
Purpose of the Study:
- To investigate the distribution of BuChE in the mouse central nervous system (CNS).
- To compare the neuroanatomical distribution of BuChE with that of ChAT.
- To elucidate the relationship between BuChE and neural elements involved in acetylcholine production.
Main Methods:
- Histochemical, immunohistochemical, and immunofluorescent staining techniques were employed on mouse brain tissues (129S1/SvImJ strain).
- Simultaneous staining for BuChE and ChAT was performed.
- Immunofluorescent double labeling was used to identify co-localization within neurons.
Main Results:
- Both BuChE and ChAT were found distributed throughout the mouse CNS.
- BuChE and ChAT exhibited overlapping distributions, with many neurons in the medulla oblongata and spinal cord containing both enzymes.
- BuChE-positive neurons were observed near ChAT-positive neuropil (thalamus, amygdala), and BuChE-positive neuropil was associated with ChAT-positive neurons (pons).
Conclusions:
- The study provides significant neuroanatomical evidence for BuChE's involvement in cholinergic regulation within the CNS.
- BuChE is localized in neural elements that either produce acetylcholine or are in close proximity to cholinergic neurons.
- These findings highlight a potentially broader role for BuChE in modulating acetylcholine levels than previously understood.
Related Concept Videos
01:22Cholinesterases: Distribution and Function
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...
01:31Direct-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...
01:22Indirect-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...
Reversible agents containing quaternary amines, such as neostigmine and edrophonium, are not easily absorbed orally because they are...
01:18Indirect-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...
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...
01:30Indirect-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...
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...
01:22Direct-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship
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...
The direct-acting...