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Related Concept Videos

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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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 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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Parasympathetic Signaling01:30

Parasympathetic Signaling

3.0K
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...
3.0K
Chemical Synapses01:26

Chemical Synapses

11.2K
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
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Chemical Synapses01:26

Chemical Synapses

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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
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Related Experiment Video

Updated: Jan 15, 2026

The Neuromuscular Junction: Measuring Synapse Size, Fragmentation and Changes in Synaptic Protein Density Using Confocal Fluorescence Microscopy
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The Neuromuscular Junction: Measuring Synapse Size, Fragmentation and Changes in Synaptic Protein Density Using Confocal Fluorescence Microscopy

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The Central Cholinergic Synapse: A Primer.

Jochen Klein1

  • 1Department of Pharmacology and Clinical Pharmacy, FB14, J. W. Goethe University of Frankfurt, Max-von-Laue-Str. 9, D-60438 Frankfurt, Germany.

International Journal of Molecular Sciences
|October 16, 2025
PubMed
Summary
This summary is machine-generated.

The central cholinergic system regulates key brain functions and is implicated in neurological and psychiatric diseases. Understanding its synapses is crucial for developing new treatments for conditions like Alzheimer's and Parkinson's disease.

Keywords:
acetylcholineacetylcholinesterasecholinecholine acetyltransferaseglucosehigh-affinity choline uptakevesicular acetylcholine transporter

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Subcutaneous Administration of Muscarinic Antagonists and Triple-Immunostaining of the Levator Auris Longus Muscle in Mice
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Subcutaneous Administration of Muscarinic Antagonists and Triple-Immunostaining of the Levator Auris Longus Muscle in Mice

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Inhibitory Synapse Formation in a Co-culture Model Incorporating GABAergic Medium Spiny Neurons and HEK293 Cells Stably Expressing GABAA Receptors
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Inhibitory Synapse Formation in a Co-culture Model Incorporating GABAergic Medium Spiny Neurons and HEK293 Cells Stably Expressing GABAA Receptors

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Related Experiment Videos

Last Updated: Jan 15, 2026

The Neuromuscular Junction: Measuring Synapse Size, Fragmentation and Changes in Synaptic Protein Density Using Confocal Fluorescence Microscopy
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The Neuromuscular Junction: Measuring Synapse Size, Fragmentation and Changes in Synaptic Protein Density Using Confocal Fluorescence Microscopy

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Subcutaneous Administration of Muscarinic Antagonists and Triple-Immunostaining of the Levator Auris Longus Muscle in Mice
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Inhibitory Synapse Formation in a Co-culture Model Incorporating GABAergic Medium Spiny Neurons and HEK293 Cells Stably Expressing GABAA Receptors
07:51

Inhibitory Synapse Formation in a Co-culture Model Incorporating GABAergic Medium Spiny Neurons and HEK293 Cells Stably Expressing GABAA Receptors

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Area of Science:

  • Neuroscience
  • Neuropharmacology

Background:

  • The central cholinergic system is vital for motor control, cognition, and reward processing.
  • Dysfunction in this system is linked to major neurological and psychiatric disorders, including Alzheimer's and Parkinson's disease, epilepsy, schizophrenia, and depression.
  • This makes the cholinergic system a significant target for drug development.

Purpose of the Study:

  • To review the key features of central cholinergic synapses.
  • To provide insights that will guide future research and drug development targeting the cholinergic system.

Main Methods:

  • The review focuses on the molecular components defining cholinergic synapses: choline acetyltransferase (ChAT), vesicular ACh transporter (VAChT), high-affinity choline transporter CHT-1, and acetylcholinesterase (AChE).
  • It examines the plasticity of cholinergic responses, influenced by firing frequency, transporter/enzyme activities, and substrate availability (glucose, choline).

Main Results:

  • Cholinergic synapses are characterized by specific proteins (ChAT, VAChT, CHT-1, AChE).
  • High-affinity choline uptake reflects neuronal activity and is modulated by enzyme and transporter levels, demonstrating significant cholinergic plasticity.
  • ACh synthesis and release can be limited by glucose and choline availability during high turnover.

Conclusions:

  • Cholinergic synapse characteristics and plasticity offer avenues for therapeutic intervention.
  • Future research should prioritize rapid measurement of ACh release and a comprehensive understanding of cholinergic plasticity across the lifespan and in dementia.