Long release latencies are increased by acetylcholine at frog endplate
Language English Country Czech Republic Media print
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
12899661
Knihovny.cz E-resources
- MeSH
- Acetylcholine pharmacology MeSH
- Action Potentials physiology MeSH
- Electric Stimulation MeSH
- Electrophysiology MeSH
- Excitatory Postsynaptic Potentials drug effects MeSH
- Motor Endplate drug effects physiology MeSH
- Neuromuscular Junction drug effects MeSH
- Synaptic Transmission drug effects MeSH
- Norepinephrine pharmacology MeSH
- Rana ridibunda MeSH
- Synapses drug effects MeSH
- In Vitro Techniques MeSH
- Animals MeSH
- Check Tag
- Animals MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Acetylcholine MeSH
- Norepinephrine MeSH
Uni-quantal endplate currents (EPCs) were recorded extracellularly at the frog neuromuscular synapse and their latency dispersions expressed as P(90) were estimated in the presence of acetylcholine. Stimulation-evoked EPCs with long release latencies increased in number when acetylcholine was applied. P90, which is designated as the interval between the minimal synaptic delay and the time at which 90 per cent of all measured uni-quantal EPCs had occurred, was significantly and reversibly increased by 66 per cent from 0.51 ms to 0.85 ms in the presence of 5x10(-4) M acetylcholine. This indicates that the evoked release pattern is less synchronous and the increased asynchrony leads to a substantial drop (by 28 per cent) in the amplitude of reconstructed multi-quantal currents.
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