The channel‐blocking action of methonium compounds on rat submandibular ganglion cells
Open accessAbstract
The effects of drugs of the polymethylene bis‐trimethylammonium (methonium) series on the characteristics of the synaptic currents (e.s.cs) recorded from voltage‐clamped rat submandibular ganglion cells have been studied. The drugs studied were from C4 to C10 (decamethonium). All of the drugs except C4 shortened the initial decay phase of the e.s.c.; C9 and C10 produced an additional slowly decaying component. These effects were interpreted in terms of an open channel block mechanism, the calculated rate constants for association with the open channel at — 80 mV being fairly similar (5.9 × 10 6 to 18.1 × 10 6m−1 s−1) for all of the compounds except C4, which had no effect on the e.s.c. decay. All of the compounds produced use‐dependent block when tested with short trains of stimuli at 10 Hz, or with trains of ionophoretic pulses of acetylcholine, consistent with their channel blocking property. Tubocurarine had a similar effect, but not trimetaphan or mecamylamine. Recovery from use‐dependent block with short chain methonium compounds, up to C8, was very slow in the absence of agonist, being incomplete even after several minutes. With C9 or C10 or tubocurarine, recovery from use‐dependent block was complete within a few seconds. With C6 recovery in the absence of agonist was unaffected by membrane potential, but could be accelerated by applying acetylcholine with the cell depolarized to — 40 mV. This persistent block was ascribed to the ability of the blocking molecule to become trapped by closure of the channel. With C9 and C10 it is assumed that their presence inhibits channel closure, so they can escape without the help of agonist. When use‐dependent block is avoided by leaving the ganglion unstimulated during equilibration with the blocking drug, the first e.s.c. elicited shows no appreciable reduction of amplitude, though with C6, C7 or C8 subsequent responses elicited at 0.1 Hz become progressively more blocked. Even at 1 m m, C6 does not prevent acetylcholine from opening ionic channels. It is concluded that all of the effects on e.s.c. amplitude can be interpreted in terms of channel block, there being no evidence of any receptor blocking action.
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Mecamylamine lacks foot-in-the-door properties at ganglionic nAChRs and has not been evaluated for such properties at α4β2 receptors.
“Mecamylamine, a frequently used nonspecific nAChR channel blocker, lacks foot-in-the-door properties at ganglionic nAChRs (64) and has not been evaluated for such properties at α4β2 receptors.”
From Nicotine is a selective pharmacological chaperone of acetylcholine receptor number and stoichiometry. Implications for drug discovery (2009) · cites this paper as [64]
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- Authors
- Gurney, A. M., & Rang, H. P.
- Affiliations
- California Institute of Technology (US)
- University College London (GB)
- ORCID
- Gurney, A.M.
- Venue
- British Journal of Pharmacology
- Publisher
- Wiley
- Published
- 1984-07
- Volume
- 82
- Issue
- 3
- Pages
- 623-642
- ISSN
- 0007-1188 (ISSN-L)
- 1476-5381
- PMC
- PMC1987010
- OpenAlex
- W4244797182
- Cited by
- 100
- References
- 44
- Citations by year
- 2022: 1 · 2021: 1 · 2020: 3 · 2017: 1 · 2014: 1 · 2013: 3
- FWCI
- 2.58
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- British Journal of Pharmacology (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Medical Research Council
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Keywords
- methonium, decamethonium, channel block, submandibular ganglion, synaptic currents, acetylcholine, use-dependent block, recovery from block, open channel block, channel closure, tubocurarine, trimetaphan, mecamylamine, nicotinic acetylcholine receptors, voltage clamp
- MeSH terms
- Acetylcholine, Animals, Electrophysiology, Female, Ganglia, Parasympathetic, Ganglionic Blockers, Kinetics, Male, Membrane Potentials, Bis-Trimethylammonium Compounds, Rats
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