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Related Concept Videos

Cholinergic Receptors: Muscarinic01:25

Cholinergic Receptors: Muscarinic

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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+....
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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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Cholinergic Neurons: Neurotransmission01:23

Cholinergic Neurons: Neurotransmission

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Cholinergic neurotransmission involves the synthesis and the release of acetylcholine (ACh) in order to transmit nerve impulses across the synapse. The process begins with the synthesis of acetyl CoA, a precursor for ACh, from ATP, acetate, and coenzyme A in the mitochondria. Choline, another vital precursor, is transported inside the neuron through choline transporters, including high-affinity choline transporter CHT1, low-affinity choline transporter CTL1, and lower-affinity choline...
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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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Parasympathetic Signaling01:30

Parasympathetic Signaling

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Parasympathetic signaling plays a crucial role in regulating various physiological processes. It involves the release of acetylcholine (ACh) by parasympathetic neurons, which can have localized and short-lived effects. The majority of ACh released is rapidly inactivated at the synapse by the enzyme acetylcholinesterase (AChE), which hydrolyzes Ach into choline and acetate. Additionally, the tissue cholinesterase deactivates any ACh diffusing into the surrounding tissues.
The effects of...
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Cholinergic Antagonists: Pharmacological Actions01:28

Cholinergic Antagonists: Pharmacological Actions

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Antimuscarinic drugs block muscarinic receptors in multiple systems, including the gut, eye, smooth muscles, respiratory tract, cardiovascular, and central nervous systems. They produce similar effects with varying selectivity depending on the specific agent and tissue. Here are the key pharmacological actions of antimuscarinics:
Gastrointestinal Effects: Antimuscarinics reduce gut contractions, increase gastric emptying, and slow intestinal transit. They partly inhibit gastric acid secretion...
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Related Experiment Video

Updated: Aug 20, 2025

Spectral Confocal Imaging of Fluorescently tagged Nicotinic Receptors in Knock-in Mice with Chronic Nicotine Administration
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Genetically tagging cholinergic diversity.

Jiaqi Keith Luo1, Lucas Pinto2

  • 1Department of Neuroscience, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA.

Neuron
|November 17, 2022
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Summary
This summary is machine-generated.

Researchers identified two distinct cholinergic neuron subtypes in the basal forebrain. These subtypes exhibit unique projection patterns, electrophysiological properties, and influence different behaviors.

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Last Updated: Aug 20, 2025

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Detection of G Protein-coupled Receptor Expression in Mouse Vagal Afferent Neurons using Multiplex In Situ Hybridization
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Area of Science:

  • Neuroscience
  • Cell Biology
  • Neuroanatomy

Background:

  • Cholinergic neurons in the basal forebrain play crucial roles in cognition and behavior.
  • Understanding the diversity within these neuronal populations is essential for deciphering their specific functions.

Purpose of the Study:

  • To identify and genetically characterize distinct subpopulations of cholinergic neurons within the basal forebrain.
  • To investigate the differential projection patterns, electrophysiological properties, and behavioral roles of these identified subtypes.

Main Methods:

  • Genetic targeting of specific neuronal populations in the basal forebrain.
  • Tracing of projection pathways using viral tracers.
  • Electrophysiological recordings to assess neuronal firing properties.
  • Behavioral assays to evaluate the functional roles of targeted neuron subtypes.

Main Results:

  • Identification of two distinct cholinergic neuron subpopulations in the basal forebrain.
  • Demonstration of unique projection targets for each subtype.
  • Characterization of differing electrophysiological profiles between the subtypes.
  • Evidence for distinct behavioral functions mediated by each cholinergic neuron subtype.

Conclusions:

  • The basal forebrain contains functionally specialized cholinergic neuron subtypes.
  • These subtypes contribute differentially to brain circuitry and behavior.
  • This discovery provides a refined understanding of cholinergic system organization and function.