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Related Concept Videos

Cholinergic Receptors: Nicotinic01:15

Cholinergic Receptors: Nicotinic

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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...
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G Protein-coupled Receptors01:15

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G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
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Cholinergic Antagonists: Chemistry and Structure-Activity Relationship01:29

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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...
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Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

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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...
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Direct-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship01:22

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

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

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

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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...
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Related Experiment Video

Updated: Dec 24, 2025

Live Imaging of Nicotine Induced Calcium Signaling and Neurotransmitter Release Along Ventral Hippocampal Axons
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Progress in nicotinic receptor structural biology.

Anant Gharpure1, Colleen M Noviello1, Ryan E Hibbs1

  • 1Department of Neuroscience, University of Texas Southwestern Medical Center, Dallas, TX, 75390, USA.

Neuropharmacology
|April 10, 2020
PubMed
Summary
This summary is machine-generated.

Structural studies reveal nicotinic acetylcholine receptor (nAChR) mechanisms. Recent crystallographic and cryo-EM data offer insights into ligand binding, ion flow, and gating, with future research areas identified.

Keywords:
Cryo-EMNicotineNicotinic acetylcholine receptorStructural biology

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Area of Science:

  • Neuroscience
  • Structural Biology
  • Pharmacology

Background:

  • Nicotinic acetylcholine receptors (nAChRs) are crucial for neurotransmission.
  • Previous structural studies faced significant resolution challenges.

Purpose of the Study:

  • To review landmark structural studies of nAChRs.
  • To summarize recent advances from crystallography and cryo-electron microscopy (cryo-EM).
  • To discuss unresolved questions in nAChR structural biology.

Main Methods:

  • Review of crystallographic data.
  • Analysis of single-particle cryo-electron microscopy (cryo-EM) studies.
  • Examination of various nAChR subunit assemblies and ligand complexes.

Main Results:

  • Insights into ligand recognition by nAChRs.
  • Understanding of ion permeation pathways.
  • Elucidation of allosteric gating mechanisms.

Conclusions:

  • Recent structural data have significantly advanced understanding of nAChR function.
  • Key aspects of nAChR structural biology remain to be explored.
  • This work contributes to the understanding of nicotine neuropharmacology.