Abstract:
:Although the dopaminergic pharmacology of the D1 receptor full agonists, dinapsoline, dihydrexidine and the prodrug ABT-431 have been studied, no information is available on the ability of these agonists to substitute for the D1 agonist SKF 38393 in rats trained to discriminate this compound from vehicle. The present study was designed to characterize the potential D1 discriminative stimulus effects of these compounds. The selective dopamine D1-receptor agonists dihydrexidine [(+/-)-trans-10,11-dihydroxy-5,6,6a,7,8,12b-hexahydrobenzo[a] phenanthridine hydrochloride], ABT-431 [(-)-trans-9,10-diacetyloxy-2-propyl-4,5,5a,6,7,11b-hexahydro-3-thia-5-azacyclopent-1-ena[c]phenanthrene hydrochloride], the diacetyl prodrug derivative of A-86929, and dinapsoline [9-dihydroxy-2,3,7,11b-tetrahydro-1H-naph[1,2,3-de]isoquinoline] were studied in rats trained to discriminate racemic SKF 38393 [(+/-)-1-phenyl-2,3,4,5-tetrahydro-(1H)-3-benzazepine-7,8-diol], a selective D1 receptor partial agonist from vehicle. All of the agonists substituted fully for the discriminative stimulus effects of SKF 38393. The rank order of potency for substitution was ABT-431 > dinapsoline > dihydrexidine > SKF 38393. The D1 receptor antagonist, SCH 23390, blocked the discriminative stimulus effects of SKF 38393. The D3/D2-receptor agonist PD 128,907 [S(+)-(4aR,10bR)-3,4,4a,10b-tetrahydro-4-propyl-2H,5H-[1]-benzopyrano[4,3-b]-1,4-oxazin-9-ol] did not substitute up to doses that produced profound rate-suppressant effects. Thus, consistent with their D1 receptor pharmacology, the full D1-receptor agonists substituted completely for the discriminative stimulus of SKF 38393.
journal_name
Behav Pharmacoljournal_title
Behavioural pharmacologyauthors
Gleason SD,Witkin JMdoi
10.1097/00008877-200402000-00010subject
Has Abstractpub_date
2004-02-01 00:00:00pages
85-9issue
1eissn
0955-8810issn
1473-5849pii
00008877-200402000-00010journal_volume
15pub_type
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