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Cholinergic Receptors: Nicotinic01:15

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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.
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Neurochemical transmission, the conduction of electrical impulses between neurons mediated by neurotransmitters, plays a vital role in various physiological processes. Autonomic drugs exert their effects by modulating neurotransmission within the autonomic nervous system. For instance, drugs such as hemicholinium block the precursor uptake necessary for synthesizing acetylcholine, an essential autonomic neurotransmitter. Following synthesis, neurotransmitters are stored in vesicles. Metyrosine...
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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...
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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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Indirect-acting cholinergic agonists work by interacting with an enzyme called acetylcholinesterase (AChE) in the synaptic cleft. They can be reversible or irreversible inhibitors and have different effects on the enzyme.
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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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Related Experiment Video

Updated: May 1, 2026

Local Application of Drugs to Study Nicotinic Acetylcholine Receptor Function in Mouse Brain Slices
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Nicotinic modulation of cortical circuits.

Sergio Arroyo1, Corbett Bennett1, Shaul Hestrin1

  • 1Department of Comparative Medicine, Stanford University School of Medicine Stanford, CA, USA.

Frontiers in Neural Circuits
|April 16, 2014
PubMed
Summary
This summary is machine-generated.

Researchers can now selectively activate basal forebrain (BF) cholinergic axons using optogenetics. This allows novel investigation into how these cholinergic synapses modulate cortical function, impacting cognition like attention and memory.

Keywords:
cholinergicinterneuronnicotinic receptorsoptogeneticsvolume transmission

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Optogenetics

Background:

  • The ascending cholinergic system modulates critical cognitive functions, including attention and working memory.
  • Previous understanding of cholinergic synaptic modulation in the cortex was limited by the inability to selectively activate cholinergic axons.

Purpose of the Study:

  • To review recent advancements in probing cholinergic synapses in the cortex.
  • To explore the cell-type specificity of nicotinic signaling and synaptic mechanisms.
  • To investigate the functional role of nicotinic modulation in cortical circuits.

Main Methods:

  • Utilizing optogenetic tools for selective activation of basal forebrain (BF) cholinergic axons.
  • Employing cell-type specific Cre-driver mouse lines.
  • Reviewing existing behavioral and anatomical data alongside new optogenetic findings.

Main Results:

  • Optogenetics enables the first direct stimulation of BF cholinergic axons projecting to the cortex.
  • New insights into the cell-type specificity of nicotinic signaling in cortical pathways.
  • Characterization of synaptic mechanisms underlying cholinergic transmission.

Conclusions:

  • Optogenetic and genetic tools provide unprecedented access to study cholinergic modulation of cortical function.
  • This approach facilitates a deeper understanding of how cholinergic systems regulate cognitive processes.
  • Future research can elucidate the precise roles of nicotinic receptors in cortical plasticity and behavior.