Abstract
Cerebellum is one of the major targets of autoimmunity and cerebellar damage that leads to ataxia characterized by the loss of fine motor coordination and balance, with no treatment available. Deep brain stimulation (DBS) could be a promising treatment for ataxia but has not been extensively investigated. Here, our study aims to investigate the use of interposed nucleus of deep cerebellar nuclei (IN-DCN) for ataxia. We first characterized ataxia-related motor symptom of a Purkinje cell (PC)-specific LIM homeobox (Lhx)1 and Lhx5 conditional double knockout mice by motor coordination tests, and spontaneous electromyogram (EMG) recording. To validate IN-DCN as a target for DBS, in vivo local field potential (LFP) multielectrode array recording of IN-DCN revealed abnormal LFP amplitude surges in PCs. By synchronizing the EMG and IN-DCN recordings (neurospike and LFP) with high-speed video recordings, ataxia mice showed poorly coordinated movements associated with low EMG amplitude and aberrant IN-DCN neural firing. To optimize IN-DCN-DBS for ataxia, we tested DBS parameters from low (30 Hz) to high stimulation frequency (130 or 150 Hz), and systematically varied pulse width values (60 or 80 µs) to maximize motor symptom control in ataxia mice. The optimal IN-DCN-DBS parameter reversed motor deficits in ataxia mice as detected by animal behavioral tests and EMG recording. Mechanistically, cytokine array analysis revealed that anti-inflammatory cytokines such as interleukin (IL)-13 and IL-4 were upregulated after IN-DCN-DBS, which play key roles in neural excitability. As such, we show that IN-DCN-DBS is a promising treatment for ataxia and possibly other movement disorders alike.
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Data Availability
The datasets and supporting materials generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- AD:
-
Alzheimer’s disease
- AP:
-
Anteroposterior
- BOSS:
-
Blackrock offline spike sorting
- CSF:
-
Cerebrospinal fluid
- DBS :
-
Deep brain stimulation
- DCN:
-
Deep cerebellar nuclei
- DKO:
-
Double knockout
- DN:
-
Dentate nucleus
- DV:
-
Dorsoventral
- EMG:
-
Electromyogram
- GAD:
-
Glutamic acid decarboxylase
- GCM:
-
Gastrocnemius muscle
- GPi :
-
Globus pallidus pars interna
- G-CSF:
-
Granulocyte-colony stimulating factor
- IL:
-
Interleukin
- IN:
-
Interposed nucleus
- IN-DCN:
-
Interposed nucleus of deep cerebellar nuclei
- IN-DCN-DBS:
-
Interposed nucleus-deep cerebellar nuclei- deep brain stimulation
- IR:
-
Infrared
- LFP:
-
Local field potential
- Lhx :
-
LIM homeobox
- MATLAB:
-
Matrix laboratory
- MEA:
-
Multielectrode array
- ML:
-
Mediolateral
- MS:
-
Multiple sclerosis
- PC:
-
Purkinje cell
- PD:
-
Parkinson’s disease
- PCA:
-
Principal component analysis
- RMS :
-
Root mean square
- SCF:
-
Stem cell factor
- STN:
-
Subthalamic nucleus
- TBI:
-
Traumatic brain injury
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This work is supported in part by the Innovation and Technology Commission of the Hong Kong Special Administrative Region Government (ITS/151/17 and ITS/168/19FP) and The Health and Medical Research Fund (HMRF), Food and Health Bureau, and Hong Kong Special Administrative Region Government (07181356) award to Chi Him Eddie Ma.
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G. K. performed the surgery, in vivo animal behavioral assessments, in vivo recordings, and electrophysiology data analysis. P. A. maintained the Lhx1/5 and Pcp2-Cre mouse colonies and genotyping, and performed the cytokine array analysis. W. H. Y. and C. T. provided technical support and advice on DBS. K. M. K. provided the Lhx1/5 ataxia mice and genotyping protocol. C. H. E. M. conceived the project, designed the study, and wrote the manuscript with inputs from all authors. All authors read and approved the manuscript.
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Kumar, G., Asthana, P., Yung, W.H. et al. Deep Brain Stimulation of the Interposed Nucleus Reverses Motor Deficits and Stimulates Production of Anti-inflammatory Cytokines in Ataxia Mice. Mol Neurobiol 59, 4578–4592 (2022). https://doi.org/10.1007/s12035-022-02872-w
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DOI: https://doi.org/10.1007/s12035-022-02872-w