Abstract
Purpose
Cerebellum modulates the amplitude of resting tremor in Parkinson’s disease (PD) via cerebello-thalamo-cortical (CTC) circuit. Tremor-related white matter alterations have been identified in PD patients by pathological studies, but in vivo evidence is limited; the influence of such cerebellar white matter alterations on tremor-related brain network, including CTC circuit, is also unclear. In this study, we investigated the cerebral and cerebellar white matter alterations in PD patients with resting tremor using diffusion tensor imaging (DTI).
Methods
In this study, 30 PD patients with resting tremor (PDWR), 26 PD patients without resting tremor (PDNR), and 30 healthy controls (HCs) from the Parkinson’s Progression Markers Initiative (PPMI) cohort were included. Tract-based spatial statistics (TBSS) and region of interest-based analyses were conducted to determine white matter difference. Correlation analysis between DTI measures and clinical characteristics was also performed.
Results
In the whole brain, TBSS and region of interest-based analyses identified higher fractional anisotropy (FA) value, lower mean diffusivity (MD) value, and lower radial diffusivity (RD) in multiple fibers. In the cerebellum, TBSS analysis revealed significantly higher FA value, decreased RD value as well as MD value in multiple cerebellar tracts including the inferior cerebellar peduncle (ICP) and middle cerebellar peduncle (MCP) when comparing the PDWR with HC, and higher FA value in the MCP when compared with PDNR.
Conclusion
We identified better white matter integrity in the cerebrum and cerebellum in PDWR indicating a potential association between the cerebral and cerebellar white matter and resting tremor in PD.
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Data availability
The data for the PPMI cohort is available at https://www.ppmi-info.org/access-data-specimens/download-data. All authors were approved for use of the database by PPMI study as independent researchers. All other data and codes relating to this study are available upon reasonable request to the corresponding authors.
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Acknowledgements
This study is supported by National Natural Science Foundation of China (grant number: 82001367, receiver: Xi Liu), Natural Science Foundation of Chongqing (grant number: cstc2021jcyj-msxmX0180, receiver: Xi Liu), Kuanren Talent Program of The Second Affiliated Hospital of Chongqing Medical University (receiver: Xi Liu), and Graduate Students Science Innovation Project of Chongqing (grant number: CYS22349, receiver: Yuke Zhong).
Funding
This study is supported by National Natural Science Foundation of China (grant number: 82001367, receiver: Xi Liu), Natural Science Foundation of Chongqing (grant number: cstc2021jcyj-msxmX0180, receiver: Xi Liu), Kuanren Talent Program of The Second Affiliated Hospital of Chongqing Medical University (receiver: Xi Liu), and Graduate Students Science Innovation Project of Chongqing (grant number: CYS22349, receiver: Yuke Zhong).
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L.C., F.D., and X.L.: conception and design; Y.Z., H.L., H.L., and G.L.: data screening; Y.Z., L.Z., C.D., and Y.L.: image processing and statistical analysis; Y.Z.: first draft; Y.Z., L.M., C.T., and X.L.: review and editing. All authors reviewed and approved the manuscript.
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The PPMI study has been approved by the institutional review boards, and written informed consent was provided by all subjects. Details are available at https://www.ppmi-info.org/access-data-specimens/download-data.
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Zhong, Y., Liu, H., Liu, G. et al. Cerebellar and cerebral white matter changes in Parkinson’s disease with resting tremor. Neuroradiology 65, 1497–1506 (2023). https://doi.org/10.1007/s00234-023-03206-w
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DOI: https://doi.org/10.1007/s00234-023-03206-w