Amnestic mild cognitive impairment in Parkinson’s disease: White matter structural changes and mechanisms

Autoři: Fuyong Chen aff001;  Tao Wu aff004;  Yuejia Luo aff006;  Zhihao Li aff006;  Qing Guan aff006;  Xianghong Meng aff001;  Wei Tao aff001;  Haobo Zhang aff006
Působiště autorů: Department of Neurosurgery, Shenzhen University General Hospital, Shenzhen University, Shenzhen, Guangdong Province, China aff001;  Shenzhen University Clinical Research Center for Neurological Diseases, Shenzhen, Guangdong Province, China aff002;  Department of Neurosurgery, the First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian Province, China aff003;  Department of Neurology, National Clinical Research Center for Geriatric Disorders, Beijing Institute of Geriatrics, Xuanwu Hospital, Capital Medical University, Beijing, China aff004;  Beijing Key Laboratory on Parkinson's Disease, Parkinson Disease Center of Beijing Institute for Brain Disorders, Beijing, China aff005;  School of Psychology, Shenzhen University, Shenzhen, Guangdong Province, China aff006;  Shenzhen Key Laboratory of Affective and Social Cognitive Science, Shenzhen, Guangdong Province, China aff007;  Center for Emotion and Brain, Shenzhen Institute of Neuroscience, Shenzhen, Guangdong Province, China aff008
Vyšlo v časopise: PLoS ONE 14(12)
Kategorie: Research Article


Mild cognitive impairment (MCI) is a heterogeneous cognitive disorder that is often comorbid with Parkinson’s diseases (PD). The amnestic subtype of PD-MCI (PD-aMCI) has a higher risk to develop dementia. However, there is a lack of studies on the white matter (WM) structural changes of PD-aMCI. We characterized the WM structural changes of PD-aMCI (n = 17) with cognitively normal PD (PD-CN, n = 19) and normal controls (n = 20), using voxel-based and tract-based spatial statistics (TBSS) analyses on fractional anisotropy (FA) axial diffusivity (AD), and radial diffusivity (RD). By excluding and then including the motor performance as a covariate in the comparison analysis between PD-aMCI and PD-CN, we attempted to discern the influences of two neuropathological mechanisms on the WM structural changes of PD-aMCI. The correlation analyses between memory and voxel-based WM measures in all PD patients were also performed (n = 36). The results showed that PD-aMCI had smaller FA values than PD-CN in the diffuse WM areas, and PD-CN had higher AD and RD values than normal controls in the right caudate. Most FA difference between PD-aMCI and PD-CN could be weakened by the motor adjustment. The FA differences between PD-aMCI and PD-CN were largely spatially overlapped with the memory-correlated FA values. Our findings demonstrated that the WM structural differences between PD-aMCI and PD-CN were mainly memory-related, and the influence of motor adjustment might indicate a common mechanism underlying both motor and memory impairment in PD-aMCI, possibly reflecting a predominant influence of dopaminergic neuropathology.

Klíčová slova:

Alzheimer's disease – Attention – Cognitive impairment – corpus callosum – Diffusion tensor imaging – Dopaminergics – Memory – Parkinson disease


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