Related Experiment Video
Updated: Jun 18, 2026

Probing Nicotinic Acetylcholine Receptor Function in Mouse Brain Slices via Laser Flash Photolysis of Photoactivatable Nicotine
Published on: January 25, 2019
Methyl lycaconitine: A novel nicotinic antagonist
A Drasdo1, M Caulfield, D Bertrand
1Department of Biochemistry, University of Bath, Bath BA2 7A Y, United Kingdom.
Methyllycaconitine (MLA), a Delphinium seed toxin, effectively blocks neuronal nicotinic acetylcholine receptors. This natural compound acts as a nicotinic antagonist, proving useful for studying these crucial receptors.
Area of Science:
- Neuroscience
- Pharmacology
- Molecular Biology
Background:
- Neuronal nicotinic acetylcholine receptors (nAChRs) are vital for neurotransmission.
- Understanding nAChR subtypes and their modulation is crucial for neurological research.
Purpose of the Study:
- To investigate Methyllycaconitine (MLA) as a nicotinic antagonist.
- To characterize MLA's action on different nAChR subtypes.
Main Methods:
- Electrophysiological recordings in Xenopus oocytes expressing specific nAChR subtypes (α3β4 and α4β2).
- Radioligand binding assays using [3H]nicotine on rat striatal membranes.
- Assessment of MLA's effect on dopamine release from rat striatal synaptosomes.
Main Results:
- MLA demonstrated potent antagonism of nAChRs at presynaptic (dopamine release) and ganglionic levels.
- MLA exhibited high affinity for nAChR subtypes, with IC50 values as low as 0.08 μM for α3β4.
- Inhibition by MLA was voltage-independent and competitive with agonist binding.
Conclusions:
- Methyllycaconitine (MLA) is a valuable nicotinic antagonist for studying nAChR function.
- MLA's specific actions across different nAChR subtypes enhance its utility in pharmacological research.
- MLA provides a new tool for investigating the role of nAChRs in the central and peripheral nervous systems.
More Related Videos
10:04Local Application of Drugs to Study Nicotinic Acetylcholine Receptor Function in Mouse Brain Slices
Published on: October 29, 2012
11:44Cellular Membrane Affinity Chromatography Columns to Identify Specialized Plant Metabolites Interacting with Immobilized Tropomyosin Kinase Receptor B
Published on: January 19, 2022
Related Concept Videos
Local Anesthetics: Mechanism of Action
Local anesthetics are amphiphilic molecules consisting of a hydrophobic aromatic part linked to a hydrophilic group by an ester or amide linkage. They are weak bases and are usually available as salts, which increases their solubility and stability. Once administered, LAs exist in the body either...
Direct-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship
The direct-acting...
Cholinergic Antagonists: Chemistry and Structure-Activity Relationship
Nondepolarizing (Competitive) Neuromuscular Blockers: Mechanism of Action
Competitive antagonists prevent acetylcholine from binding to its receptor, inhibiting membrane depolarization. Without conformational changes or intrinsic...
Drugs Acting on Autonomic Ganglia: Stimulants
Ganglionic stimulants activate NM nicotinic receptors in autonomic ganglia, falling into two categories: nicotine mimetics [e.g., lobeline, dimethylpiperazine, tetramethylammonium] and muscarinic receptor agonists [e.g., muscarine, methacholine]. The first category's action is rapid and blocked by nicotinic receptor antagonists, while the second category's action is delayed and blocked by atropine-like agents. Nicotine, an alkaloid, affects the heart rate by stimulating sympathetic or...
Local Anesthetics: Chemistry and Structure-Activity Relationship