Hypomobility after DOI administration can be reversed by subthalamic nucleus deep brain stimulation
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Published on: May 31, 2016
Rob Hameleers1, Arjan Blokland, Harry W M Steinbusch
1Department of Neuroscience, Faculty of Health, Medicine and Life Sciences, Maastricht University, P.O. Box 616, 6200 MD Maastricht, The Netherlands.
Abstract:
Intervening with serotonergic neurotransmission can have profound effects on mobility. For instance, the peripheral administration of the 5-HT(2A/C) agonist, 2,5-dimethoxy-4-iodoamphetamine (DOI), changes the locomotor activity substantially. Locomotor activity is classically linked to the basal ganglia, in which the subthalamic nucleus (STN) plays a pivotal role. In this study, we tested the hypothesis that deep brain stimulation (DBS) of the STN modulates DOI-induced hypomobility. Rats were implanted with stimulating electrodes at the level of the STN and were tested in an open field (OF) task in various conditions (stimulation on/off, in combination with DOI treatment). We found that DOI administration (i.p.) reduced the behavioural activity of the animals and that STN HFS reversed these effects. This study provides the first evidence that the therapeutic effect of STN HFS may also be mediated by a 5-HT-dependent mechanism.
