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- W2100723494 abstract "The membrane potential of purely cholinergic synaptosomes isolated from Torpedo electric organ was monitored with fluorescent carbocyanine dyes. An increased fluorescence was associated with depolarization and a quenching with hyperpolarization. Fluorescence data provided evidence that Torpedo synaptosomes have a membrane potential mainly driven by a K+ diffusion potential and a membrane potential of about -50 mV could be estimated after calibration of fluorescence signals with ionophore antibiotics. The release of acetylcholine (ACh) from Torpedo synaptosomes was monitored continuously by measuring the light emitted by a chemiluminescent method (Israël & Lesbats, 1981 a). Using fluorescence data, the release of ACh was expressed as a function of membrane potential. The relationship between presynaptic potential and transmitter release as determined by biochemical methods at cholinergic nerve endings showed striking similarities to that observed at the squid giant synapse. Several substances were also tested with regard to their depolarizing and releasing properties and it was found that the toxin isolated from the venom of the annelid Glycera convoluta, which induced a large increase in quantal release of transmitter (Manaranche, Thieffry, & Israël, 1980) promoted a depolarization of Torpedo synaptosomes in addition to ACh release." @default.
- W2100723494 created "2016-06-24" @default.
- W2100723494 creator A5021395235 @default.
- W2100723494 date "1984-09-01" @default.
- W2100723494 modified "2023-09-25" @default.
- W2100723494 title "Relationship between presynaptic membrane potential and acetylcholine release in synaptosomes from Torpedo electric organ." @default.
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- W2100723494 doi "https://doi.org/10.1113/jphysiol.1984.sp015367" @default.
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