Untangling cortico-striatal connectivity and cross-frequency coupling in L-DOPA-induced dyskinesia
2016 (English)In: Frontiers in Systems Neuroscience, ISSN 1662-5137, E-ISSN 1662-5137, Vol. 10, no 26, 1-12 p.Article in journal (Refereed) Published
We simultaneously recorded local field potentials in the primary motor cortex and sensorimotor striatum in awake, freely behaving, 6-OHDA lesioned hemi-parkinsonian rats in order to study the features directly related to pathological states such as parkinsonian state and levodopa-induced dyskinesia. We analysed the spectral characteristics of the obtained signals and observed that during dyskinesia the most prominent feature was a relative power increase in the high gamma frequency range at around 80 Hz, while for the parkinsonian state it was in the beta frequency range. Here we show that during both pathological states effective connectivity in terms of Granger causality is bidirectional with an accent on the striatal influence on the cortex. In the case of dyskinesia, we also found a high increase in effective connectivity at 80 Hz. In order to further understand the 80- Hz phenomenon, we performed cross-frequency analysis and observed characteristic patterns in the case of dyskinesia but not in the case of the parkinsonian state or the healthy state. We noted a large decrease in the modulation of the amplitude at 80 Hz by the phase of low frequency oscillations (up to ~10 Hz) across both structures in the case of dyskinesia. This may suggest a lack of coupling between the low frequency activity of the recorded network and the group of neurons active at ~80 Hz.
Place, publisher, year, edition, pages
Frontiers , 2016. Vol. 10, no 26, 1-12 p.
Cortico-striatal circuits, Levodopa-induced dyskinesia, Parkinson’s disease, effective connectivity, Cross-frequency coupling
Medical and Health Sciences Natural Sciences
IdentifiersURN: urn:nbn:se:kth:diva-184005DOI: 10.3389/fnsys.2016.00026ISI: 000372965400001ScopusID: 2-s2.0-84964898882OAI: oai:DiVA.org:kth-184005DiVA: diva2:913826
FunderScience for Life Laboratory - a national resource center for high-throughput molecular bioscienceSwedish Research Council
QC 201604192016-03-222016-03-222016-08-26Bibliographically approved