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Postsynaptic effects of DMSO at the frog neuromuscular junction
1Department of Physiology, Hebrew University, Hadassah Medical School, Jerusalem, Israel.
Brain Research
|December 6, 1991
Summary
Dimethyl sulfoxide (DMSO) enhances acetylcholine release and also inhibits acetylcholine esterase at the frog neuromuscular junction. This dual action affects miniature end-plate potentials, impacting synaptic transmission.
Area of Science:
- Neuroscience
- Pharmacology
- Biochemistry
Background:
- Dimethyl sulfoxide (DMSO) is known to enhance acetylcholine release presynaptically.
- The postsynaptic effects of DMSO, particularly on acetylcholine esterase, require further investigation.
Purpose of the Study:
- To investigate the postsynaptic effects of DMSO at the frog cutaneous pectoris neuromuscular junction.
- To determine if DMSO influences miniature end-plate potentials (meppse) and acetylcholine esterase activity.
Main Methods:
- Electrophysiological techniques were employed to record extracellularly.
- Computer-assisted analysis was used to study meppse amplitude and decay time constant (tau).
- Results were compared in the presence and absence of DMSO.
Main Results:
- DMSO significantly increased the average amplitude of meppse.
- The time constant (tau) of meppse decay was also elevated by DMSO.
- A strong correlation was observed between meppse amplitude and tau in the presence of DMSO.
Conclusions:
- DMSO exhibits a postsynaptic inhibitory effect on acetylcholine esterase activity.
- This postsynaptic action complements DMSO's known presynaptic enhancement of acetylcholine release.
- The findings suggest a dual role for DMSO in modulating neuromuscular transmission.