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Related Concept Videos

Cholinergic Receptors: Nicotinic01:15

Cholinergic Receptors: Nicotinic

Nicotinic receptors are ligand-gated ion channels that are activated by acetylcholine and nicotine. Upon activation, they cause a rapid increase in the permeability of cells to K+, Na+, and Ca2+, followed by depolarization and excitation. They are in the autonomic ganglia, skeletal neuromuscular junction, CNS, and adrenal medulla.
There are two types of nicotinic receptors: neuromuscular (NM/NM/N1) and neuronal (NN/NN/N2). The two families differ based on their location and selectivity to...
Direct-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship01:22

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

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

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...
Cholinergic Antagonists: Chemistry and Structure-Activity Relationship01:29

Cholinergic Antagonists: Chemistry and Structure-Activity Relationship

Cholinergic antagonists bind to cholinergic receptors and limit the effects of acetylcholine and other cholinergic agonists. Based on the specific cholinergic receptor affinity, these antagonists are classified as muscarinic or nicotinic. Anticholinergics interrupt parasympathetic innervations while sympathetic innervations remain uninterrupted. Muscarinic antagonists are also called 'muscarinic antagonists', 'antimuscarinics', or 'parasympatholytics'. Nicotinic antagonists are called...
Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
Cholinergic Receptors: Muscarinic01:25

Cholinergic Receptors: Muscarinic

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+. Activation...

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Related Experiment Video

Updated: Jun 19, 2026

Localization of Plasma Membrane and Intracellular Neuronal Nicotinic Acetylcholine Receptors Using Quantitative Imaging in Mammalian Cells
09:06

Localization of Plasma Membrane and Intracellular Neuronal Nicotinic Acetylcholine Receptors Using Quantitative Imaging in Mammalian Cells

Published on: December 19, 2025

Anionic lipids allosterically modulate multiple nicotinic acetylcholine receptor conformational equilibria.

Corrie J B daCosta1, Sarah A Medaglia, Nadine Lavigne

  • 1Department of Biochemistry, Microbiology, and Immunology, University of Ottawa, Ottawa, Ontario K1H 8M5, Canada.

The Journal of Biological Chemistry
|October 10, 2009
PubMed
Summary
This summary is machine-generated.

Anionic lipids stabilize the nicotinic acetylcholine receptor (nAChR) by influencing membrane properties. Smaller headgroup anionic lipids are most effective, modulating receptor conformations and acting as allosteric modulators.

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Localization of Plasma Membrane and Intracellular Neuronal Nicotinic Acetylcholine Receptors Using Quantitative Imaging in Mammalian Cells
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Published on: April 28, 2026

Area of Science:

  • Membrane biophysics
  • Neuroscience
  • Molecular pharmacology

Background:

  • Anionic lipids are known to affect nicotinic acetylcholine receptor (nAChR) gating.
  • The precise mechanisms by which anionic lipids modulate nAChR function remain largely unknown.

Purpose of the Study:

  • To elucidate the role of anionic lipids in stabilizing the agonist-activatable state of the nAChR.
  • To investigate how lipid headgroup size and membrane physical properties influence nAChR conformational equilibria.

Main Methods:

  • Investigated the effects of various anionic lipids on nAChR stability and function.
  • Assessed the relationship between lipid headgroup size, membrane packing, and receptor stabilization.
  • Analyzed the influence of lipids on resting, uncoupled, and desensitized nAChR conformations.

Main Results:

  • Anionic lipids with smaller headgroups, enhancing lipid packing, most effectively stabilize the agonist-activatable nAChR.
  • Lipid-induced stabilization is achieved by preferentially favoring the resting conformation over uncoupled and desensitized states.
  • Anionic lipids modulate multiple nAChR conformational equilibria.

Conclusions:

  • Anionic lipids act as allosteric modulators of nAChR function.
  • Both lipid properties and membrane physical characteristics influence nAChR function by stabilizing specific conformational states.