Dynorphin modulates dopamine D1-receptor mediated turning behavior in 6-hydroxydopamine-lesioned rats.
We investigated if the potentiated turning response to a challenge with the partial dopamine D1 receptor agonist SKF-38393, as seen after priming with L-dihydroxyphenylalanine (DOPA) of unilaterally 6-hydroxydopamine-lesioned rats, can be modulated by infusion of dynorphin A (1-17) in the striatum. Seventeen days after the 6-hydroxydopamine lesion, rats received intrastriatal dynorphin (0. 08 or 3.85 microg) followed by L-DOPA (50 mg/kg i.p.) and were challenged 3 days later with SKF-38393 (3.0 mg/kg s.c.). Compared to controls, the lower dose of dynorphin caused an earlier onset of turning, while the higher dose decreased the response to SKF-38393. These findings suggest a dose-dependent modulatory role for striatal dynorphin in L-DOPA-priming of a D1-mediated behavioral response.
van de Witte
S V
SV
Research Institute Neurosciences, Vrije Universiteit, Department of Anatomy, van der Boechorststraat 7, 1081 BT, The, Amsterdam, The Netherlands.
Groenewegen
H J
HJ
Drukarch
B
B
Voorn
P
P
D015647:2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine / Q000494:pharmacology*; D018663:Adrenergic Agents / Q000008:administration & dosage / Q000494:pharmacology; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects* / Q000502:physiology*; D018491:Dopamine Agonists / Q000494:pharmacology*; D004399:Dynorphins / Q000008:administration & dosage / Q000378:metabolism / Q000502:physiology*; D007150:Immunohistochemistry; D007276:Injections, Intraventricular; D008297:Male; D016627:Oxidopamine / Q000008:administration & dosage / Q000494:pharmacology*; D051381:Rats; D017208:Rats, Wistar; D017447:Receptors, Dopamine D1 / Q000819:agonists / Q000502:physiology*
D018663:Adrenergic Agents; D018491:Dopamine Agonists; D017447:Receptors, Dopamine D1; D015647:2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine; D004399:Dynorphins; D016627:Oxidopamine