| Autor: |
Ujike, Hiroshi, Onoue, Taichi, Akiyama, Kazufumi, Hamamura, Takashi, Otsuki, Saburo |
| Zdroj: |
Psychopharmacology; 1989, Vol. 98 Issue 1, p89-92, 4p |
| Abstrakt: |
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 sterotypy. 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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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