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Graded 6-OHDA-induced dopamine depletion in the nigrostriatal pathway evokes progressive pathological neuronal activities in the subthalamic nucleus of a hemi-parkinsonian mouse

Authors
Park, Sunghee EstelleSong, Kang-IlKim, HyungminChung, SeokYoun, Inchan
Issue Date
15-5월-2018
Publisher
ELSEVIER SCIENCE BV
Keywords
6-Hydroxydopamine; Electrophysiology; Medial forebrain bundle; Parkinson' s disease; Subthalamic nucleus
Citation
BEHAVIOURAL BRAIN RESEARCH, v.344, pp.42 - 47
Indexed
SCIE
SCOPUS
Journal Title
BEHAVIOURAL BRAIN RESEARCH
Volume
344
Start Page
42
End Page
47
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/75541
DOI
10.1016/j.bbr.2018.02.014
ISSN
0166-4328
Abstract
Recent studies have established methods for establishing a rodent model that mimics progressive stages of human Parkinson's disease (PD), via injection of graded doses of 6-hydroxydopamine (6-OHDA) into regions within the nigrostriatal pathway. However, the electrophysiological characteristics of the subthalamic nucleus (STN) in this model have not been fully elucidated in this model. This study aimed to investigate changes in the neuronal activity of the STN in a graded mouse model of PD. Increasing doses of 6-OHDA were unilaterally injected into the medial forebrain bundle (MFB) to produce a hemi-parkinsonian mouse model, mimicking early, moderate, advanced, and severe stages of human PD. Mice treated with higher doses of 6-OHDA demonstrated significantly lower rates of use of the impaired (contralateral) forelimb during wall contact, relative to sham mice. The STN firing rate was significantly increased in groups with > 75% dopaminergic cell loss in the substantia nigra pars compacta (SNc), whereas little increase was observed in groups with partial lesions of the SNc, relative to the sham group. In addition, firing patterns of the STN in groups treated with higher doses of 6-OHDA became more irregular and exhibited burst-like patterns of activity, with dominant slow wave oscillations in the frequency range of 0.3-2.5 Hz. Our results demonstrated a strong correlation between neuronal activities in the STN and dopamine depletion in the nigrostriatal pathway, which can be manipulated by variation of 6-OHDA doses.
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