Abstract:
:The effects of selective dopamine antagonists on the pentazocine-like discriminative stimulus effects of morphine were investigated in the rat trained to discriminate 3.0 mg/kg of pentazocine from vehicle. Morphine (3.0 mg/kg), a mu-selective agonist, produced stimulus effects in common with pentazocine (3.0 mg/kg), indicating that the stimulus effects are mediated through mu opioid receptors. The pentazocine-like stimulus effects of morphine (3.0 mg/kg) were clearly inhibited by the dopamine D-1 antagonist SCH23390 (0.03-0.56 mg/kg) but not by the dopamine D-2 antagonist sulpiride (20.0-80.0 mg/kg). The results suggest that the pentazocine-like discriminative stimulus effects of morphine are mediated via dopamine D-1 receptors.
journal_name
Brain Resjournal_title
Brain researchauthors
Ukai M,Hiraiwa E,Kameyama Tdoi
10.1016/0006-8993(91)91088-isubject
Has Abstractpub_date
1991-02-08 00:00:00pages
146-8issue
1eissn
0006-8993issn
1872-6240pii
0006-8993(91)91088-Ijournal_volume
541pub_type
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