Abstract:
:In rats anaesthetized with urethane single unit activity was extracellularly recorded in the neostriatum, and several drugs were microiontophoretically ejected. Separate administration of the sulfated octapeptide cholecystokinin (CCK-8S), serotonin (5-HT) or 8-OH-DPAT (a 5-HT(1A/7) receptor agonist) predominantly induced increases in the neuronal discharge rates (Wilcoxon test significant P<0.05), whereas the 5-HT(2A/2C) receptor agonist DOI affected only a few neurones and mainly reduced firing. After coadministration of CCK-8S and serotonin, activating effects also predominated (Wt P<0.05), but the neuronal responsiveness was significantly reduced (Chi2P<0.01). Similarly, concomitant application of CCK-8S and 8-OH-DPAT led to significant activation accompanied with a reduction of inhibitory effects. The block of serotonin- or 8-OH-DPAT-effects through specific 5-HT(1A) receptor antagonists implies the involvement of this receptor subtype within the striatum. In conclusion, concomitant action of CCK-8S and serotonin induces a mean level of neuronal activation that might promote normal function.
journal_name
Neuropeptidesjournal_title
Neuropeptidesauthors
Wilms K,Vierig G,Davidowa Hdoi
10.1054/npep.2001.0875keywords:
subject
Has Abstractpub_date
2001-10-01 00:00:00pages
257-70issue
5-6eissn
0143-4179issn
1532-2785pii
S0143-4179(01)90875-3journal_volume
35pub_type
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