Abstract:
:The effects of bilateral intracranial injections of the D-1 dopamine receptor antagonist SCH 23390 HCl (0, 0.8, 1.6, 3.2, and 6.4 microgram total bilateral dose) administered into the dorsolateral bed nucleus of the stria terminalis (dlBNST) immediately prior to a 3 h intravenous cocaine self-administration session were examined. In addition, anatomical control injections of the most effective dose of SCH 23390 HCl (6.4 micogram) were made either 1.5 mm dorsal to the dlBNST or into the lateral ventricle. Injections directly into the dlBNST, but not those dorsal to the dlBNST or into the lateral ventricle, significantly increased the rate of cocaine self-administration within the first 20 min of the self-administration session, consistent with a partial attenuation of the reinforcing effects of cocaine under a fixed-ratio schedule of reinforcement (0.25 mg cocaine iv; fixed-ratio 5, timeout 20 s). Injections into all three sites increased cocaine self-administration across the entire 3 h session. These results suggest a role for D-1 dopamine receptors in the dlBNST in the reinforcing properties of self-administered cocaine, and also support the hypothesis that D-1 dopamine receptors in the 'extended amygdala' may play a significant role in cocaine self-administration.
journal_name
Brain Resjournal_title
Brain researchauthors
Epping-Jordan MP,Markou A,Koob GFdoi
10.1016/s0006-8993(97)01190-6subject
Has Abstractpub_date
1998-02-16 00:00:00pages
105-15issue
1-2eissn
0006-8993issn
1872-6240pii
S0006-8993(97)01190-6journal_volume
784pub_type
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