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Transmitter release from insect excitatory motor nerve terminals
The Journal of Physiology
|December 1, 1972
Summary
Investigating locust nerve-muscle synapses revealed that transmitter release, both spontaneous and impulse-linked, deviates from random patterns. Post-impulse facilitation significantly enhances both release types.
Area of Science:
- Neuroscience
- Synaptic Transmission
- Insect Physiology
Background:
- Locust retractor unguis nerve-muscle synapses are crucial for motor control.
- Understanding transmitter release mechanisms is fundamental to neuroscience.
Purpose of the Study:
- To investigate spontaneous and impulse-linked transmitter release at locust nerve-muscle synapses.
- To analyze the patterns and facilitation of transmitter release.
Main Methods:
- Utilized intracellular and extracellular electrodes for electrophysiological recordings.
- Examined excitatory post-synaptic potentials (e.p.s.p.s) and miniature e.p.s.p.s (min e.p.s.p.s).
- Analyzed amplitude distributions and temporal patterns of transmitter release.
Main Results:
- Extracellular recordings showed non-Poisson amplitude distributions for e.p.s.p.s, influenced by synapse structure.
- Spontaneous min e.p.s.p.s occurred in bursts, not randomly, deviating from a Poisson process.
- A conditioning nerve impulse induced facilitation of test e.p.s.p.s and enhanced spontaneous release for at least 390 msec, with primary and secondary phases.
Conclusions:
- Transmitter release at locust neuromuscular junctions is not strictly random.
- Synaptic facilitation plays a significant role in modulating both evoked and spontaneous transmitter release.