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Effect of enflurane on cerebellar cGMP and on motor activity in the mouse
Abstract:
The effect of enflurane on the cerebellar content of the intracellular mediator cyclic 3', 5'-guanosine monophosphate (cGMP) and on motor activity was studied in mice. Seizures, as an index of increased motor activity, associated with an increase in cerebellar cGMP content were induced with isoniazide or picrotoxin. Enflurane 0.28-1.68 vol% produced a dose-dependent, reversible decrease in cerebellar cGMP (by about 50% at 0.28 vol%) and delayed or prevented both the increase in cerebellar cGMP and the convulsions induced by isoniazide. Enflurane also protected against picrotoxin-induced convulsions, but not against strychnine-induced convulsions which presumably do not involve cerebellar mechanisms. These results indicate that enflurane affects the cerebellar mechanisms controlling motor activity and it is postulated that this action contributes to the decrease in muscle tone induced by enflurane.
Insights
Enflurane reduces cerebellar cyclic 3
Area of Science:
- Neuroscience
- Anesthesiology
- Biochemistry
Background:
- Cerebellar cyclic 3', 5'-guanosine monophosphate (cGMP) is an intracellular mediator involved in motor activity regulation.
- Seizures, indicative of heightened motor activity, correlate with increased cerebellar cGMP levels.
Purpose of the Study:
- To investigate the impact of enflurane on cerebellar cGMP levels and motor activity in mice.
- To determine if enflurane's effects on motor activity are mediated by changes in cerebellar cGMP.
Main Methods:
- Mice were administered enflurane at varying concentrations (0.28-1.68 vol%).
- Motor activity was assessed via induced seizures using isoniazide or picrotoxin.
- Cerebellar cGMP content was measured.
Main Results:
- Enflurane demonstrated a dose-dependent, reversible decrease in cerebellar cGMP.
- Enflurane inhibited isoniazide-induced increases in cerebellar cGMP and prevented convulsions.
- Enflurane offered protection against picrotoxin-induced seizures but not strychnine-induced seizures.
Conclusions:
- Enflurane influences cerebellar mechanisms that control motor activity.
- The observed decrease in muscle tone associated with enflurane anesthesia may be linked to its action on cerebellar pathways.
- Cerebellar cGMP signaling is implicated in enflurane's modulatory effects on motor control.