Dizocilpine prevents the enhanced locomotor response to quinpirole induced by repeated electroconvulsive shock.
Repeated administration of electroconvulsive shock, as expected, potentiated the locomotor stimulant response to quinpirole (0.3 mg/kg s.c.), a dopamine D2-like receptor agonist. Chronic, but not acute, treatment with the NMDA receptor non-competitive antagonist dizocilpine (0.3 mg/kg i.p.) prevented electroconvulsive shock-induced potentiation of quinpirole locomotor response. These results suggest that NMDA receptor activation is necessary for the development of supersensitivity to dopamine receptor agonists produced by repeated electroconvulsive shock. The relevance of this observation in regard to the mechanism of electroconvulsive shock therapeutic effect is discussed.
D'Aquila
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Dipartimento di Neuroscienze B.B. Brodie, Università di Cagliari, Italy.
Collu
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Gessa
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Serra
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D000818:Animals; D016291:Dizocilpine Maleate / Q000494:pharmacology*; D004597:Electroshock; D018691:Excitatory Amino Acid Antagonists / Q000494:pharmacology*; D008297:Male; D009043:Motor Activity / Q000187:drug effects*; D019257:Quinpirole / Q000037:antagonists & inhibitors* / Q000494:pharmacology; D051381:Rats; D017207:Rats, Sprague-Dawley; D017448:Receptors, Dopamine D2 / Q000187:drug effects*; D016194:Receptors, N-Methyl-D-Aspartate / Q000187:drug effects
D018691:Excitatory Amino Acid Antagonists; D017448:Receptors, Dopamine D2; D016194:Receptors, N-Methyl-D-Aspartate; D019257:Quinpirole; D016291:Dizocilpine Maleate