Effects of selective D-1 and D-2 dopamine antagonists on development of methamphetamine-induced behavioral sensitization.
The present study examined effects of selective antagonists of D-1 and D-2 dopamine receptors on the development of behavioral sensitization produced by repeated methamphetamine (MAP) administration. Male Sprague-Dawley rats were divided into four groups. Each group received a daily injection of saline (control group), 4 mg/kg MAP (MAP group), 1 mg/kg YM-09151-2 plus 4 mg/kg MAP (YM + MAP group) or 0.5 mg/kg SCH 23390 plus 4 mg/kg MAP (SCH + MAP group) for 14 days. During daily injection for 14 days, the MAP group exhibited a progressive augmentation in locomotor and stereotyped behavior, whereas the progression of such behaviors in the YM + MAP and SCH + MAP group was completely prevented. After an abstinence period of 7 days, all groups received a challenge of 2 mg/kg MAP. The MAP challenge reproduced hyperlocomotion and intense stereotyped behavior only in the MAP group. However, neither the YM + MAP group nor the SCH + MAP group showed stereotypy. The manner in which both groups showed only hyperlocomotion was similar to that observed in the control group. These results indicate that both selective D-1 antagonists and selective D-2 antagonists not only reverse MAP-induced motor effects at each injection but also prevent the development of behavioral sensitization induced by repeated MAP administration.
Ujike
H
H
Department of Neuropsychiatry, Okayama University Medical School, Japan.
Onoue
T
T
Akiyama
K
K
Hamamura
T
T
Otsuki
S
S
D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects*; D001794:Blood Pressure / Q000187:drug effects; D018492:Dopamine Antagonists; D008297:Male; D008694:Methamphetamine / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains; D013239:Stereotyped Behavior / Q000187:drug effects
D018492:Dopamine Antagonists; D008694:Methamphetamine