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Dynorphin modulates dopamine D1-receptor mediated turning behavior in 6-hydroxydopamine-lesioned rats
S V van de Witte1, H J Groenewegen, B Drukarch
1Research Institute Neurosciences, Vrije Universiteit, Department of Anatomy, van der Boechorststraat 7, 1081 BT, The, Amsterdam, The Netherlands.
Abstract:
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.