The effect of apomorphine on the EEG of freely moving rats was studied. Apomorphine at the dose of 1 mg/kg caused stereotypy and a marked reduction of total sleep. On the contrary, acute subcutaneous administration of apomorphine at the dose of 100 microgram/kg, or less, markedly increased the amount of total sleep (corresponding mostly to synchronized sleep). Moreover, the infusion of apomorphine (80 microgram/kg/h) for 4 h doubled the duration of slow and REM sleep. The hypnotic effect of apomorphine was prevented by neuroleptics, such as pimozide, benzperidol and L-sulpiride, at doses which, per se, did not modify the EEG of the animals. These results suggest the existence in the CNS of DA receptors mediating sleep.
Sleep induced by low doses of apomorphine in rats.
PAGLIETTI, MARIA ELISABETTA;DI CHIARA, GAETANO;
1979-01-01
Abstract
The effect of apomorphine on the EEG of freely moving rats was studied. Apomorphine at the dose of 1 mg/kg caused stereotypy and a marked reduction of total sleep. On the contrary, acute subcutaneous administration of apomorphine at the dose of 100 microgram/kg, or less, markedly increased the amount of total sleep (corresponding mostly to synchronized sleep). Moreover, the infusion of apomorphine (80 microgram/kg/h) for 4 h doubled the duration of slow and REM sleep. The hypnotic effect of apomorphine was prevented by neuroleptics, such as pimozide, benzperidol and L-sulpiride, at doses which, per se, did not modify the EEG of the animals. These results suggest the existence in the CNS of DA receptors mediating sleep.
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