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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...
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...
Drugs Acting on Autonomic Ganglia: Stimulants01:23

Drugs Acting on Autonomic Ganglia: Stimulants


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 sympathetic or...
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...
Parasympathetic Signaling01:30

Parasympathetic Signaling

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...
Direct-Acting Cholinergic Agonists: Pharmacological Actions00:59

Direct-Acting Cholinergic Agonists: Pharmacological Actions

Direct-acting cholinergic agonists exert their pharmacological actions by mimicking the effects of acetylcholine on postsynaptic muscarinic receptors to generate parasympathetic responses. These agents elicit a range of physiological responses, including cardiovascular effects. For example, activation of muscarinic receptors induces bradycardia, decreased cardiac output, reduced peripheral resistance, and consequent hypotension. In the eye, stimulation of M3 receptors leads to smooth muscle...

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Related Experiment Video

Updated: Jun 4, 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

Effects of static magnetic fields on nicotinic cholinergic receptor function.

María Fernanda Tolosa1, Cecilia Bouzat, Walter Rubén Cravero

  • 1Departamento de Física, Universidad Nacional del Sur, Bahía Blanca, Argentina.

Bioelectromagnetics
|February 24, 2011
PubMed
Summary

Static magnetic fields did not alter acetylcholine receptor function. This study found no significant changes in acetylcholine receptor kinetics or currents when exposed to magnetic fields, indicating negligible influence on channel activity.

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Probing Nicotinic Acetylcholine Receptor Function in Mouse Brain Slices via Laser Flash Photolysis of Photoactivatable Nicotine
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Published on: January 25, 2019

Area of Science:

  • Neuroscience
  • Biophysics
  • Molecular Biology

Background:

  • Ligand-gated ion channels, such as acetylcholine receptors, are crucial for neuronal signaling.
  • Understanding factors influencing ion channel kinetics is essential for neuroscience research.
  • The potential impact of electromagnetic fields on biological systems is an area of ongoing investigation.

Purpose of the Study:

  • To investigate the effect of static magnetic fields on the kinetics of adult mouse muscle acetylcholine receptors.
  • To determine if magnetic field exposure influences acetylcholine receptor-mediated currents.
  • To assess the interaction between temperature and magnetic fields on ion channel function.

Main Methods:

  • Utilized mammalian transfected cells expressing adult mouse muscle acetylcholine receptors.
  • Employed patch-clamp electrophysiology (outside-out and cell-attached configurations) to measure currents.
  • Exposed cells to static magnetic fields (up to 180 mT) across a temperature range (5–50 °C).

Main Results:

  • No significant alterations were observed in acetylcholine-elicited macroscopic or single-channel currents.
  • Temperature dependence of current decay constants was consistent with known biophysical properties.
  • Magnetic field exposure showed negligible influence on the acetylcholine receptor channel kinetics.

Conclusions:

  • Static magnetic fields, within the tested range, do not significantly affect the function of adult mouse muscle acetylcholine receptors.
  • Temperature remains a primary factor influencing acetylcholine receptor current decay.
  • Further research may explore other electromagnetic field parameters or receptor subtypes.