title: Suppression of oro-facial movements by rolipram, a cAMP phosphodiesterase inhibitor, in rats chronically treated with haloperidol.
abstract: We investigated the effects of rolipram, a selective cyclic adenosine 3',5'-monophosphate phosphodiesterase type IV inhibitor, and isobutylmethylxanthine, a nonselective phosphodiesterase inhibitor, on purposeless spontaneous chewing movements and tongue protrusions produced by 24 weeks treatment with haloperidol decanoate (25 mg/kg every 4 weeks i.m.) in rats, to examine our hypothesis that restoration of striatal cyclic adenosine 3',5'-monophosphate levels previously reduced due to dopamine D2 receptor supersensitivity, may suppress these movements. Tests were performed 8 weeks after the final injection. Haloperidol treatment significantly increased dyskinetic movements and striatal dopamine D2 receptor density compared with controls. Rolipram (0.1-1.0 mg/kg i.p.) suppressed these movements in a dose-dependent manner, whereas isobutylmethylxanthine (2 mg/kg i.p.) only slightly suppressed the syndrome and doses higher than 5 mg/kg i.p. produced other intensive movements. These results support our hypothesis and suggest that rolipram may have a therapeutic effect on tardive dyskinesia.
mesh_terms: D015056:1-Methyl-3-isobutylxanthine / Q000494:pharmacology; D015105:3',5'-Cyclic-AMP Phosphodiesterases / Q000037:antagonists & inhibitors*; D000818:Animals; D014150:Antipsychotic Agents / Q000494:pharmacology*; D003864:Depression, Chemical; D018492:Dopamine Antagonists / Q000494:pharmacology*; D004409:Dyskinesia, Drug-Induced / Q000188:drug therapy; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D006220:Haloperidol / Q000037:antagonists & inhibitors*; D008297:Male; D010726:Phosphodiesterase Inhibitors / Q000494:pharmacology; D011760:Pyrrolidinones / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D020889:Rolipram
chemical_list: D014150:Antipsychotic Agents; D018492:Dopamine Antagonists; D004791:Enzyme Inhibitors; D010726:Phosphodiesterase Inhibitors; D011760:Pyrrolidinones; D015105:3',5'-Cyclic-AMP Phosphodiesterases; D006220:Haloperidol; D020889:Rolipram; D015056:1-Methyl-3-isobutylxanthine