title: Alteration of regional homogeneity and white matter hyperintensities in amnestic mild cognitive impairment subtypes are related to cognition and CSF biomarkers.
abstract: Amnestic mild cognitive impairment can be further classified as single-domain aMCI (SD-aMCI) with isolated memory deficit, or multi-domain aMCI (MD-aMCI) if memory deficit is combined with impairment in other cognitive domains. Prior studies reported these clinical subtypes presumably differ in etiology. Thus, we aimed to explore the possible mechanisms between different aMCI subtypes by assessing alteration in brain activity and brain vasculature, and their relations with CSF AD biomarkers. 49 healthy controls, 32 SD-aMCI, and 32 MD-aMCI, who had undergone structural scans, resting-state functional MRI (rsfMRI) scans and neuropsychological evaluations, were identified. Regional homogeneity (ReHo) was employed to analyze regional synchronization. Periventricular white matter hyperintensities (PWMH) and deep WMH (DWMH) volume of each participant was quantitatively assessed. AD biomarkers from CSF were also measured. SD-aMCI showed decreased ReHo in medial temporal gyrus (MTG), and increased ReHo in lingual gyrus (LG) and superior temporal gyrus (STG) relative to controls. MD-aMCI showed decreased ReHo, mostly located in precuneus (PCu), LG and postcentral gyrus (PCG), relative to SD-aMCI and controls. As for microvascular disease, MD-aMCI patients had more PWMH burden than SD-aMCI and controls. Correlation analyses indicated mean ReHo in differenced regions were related with memory, language, and executive function in aMCI patients. However, no significant associations between PWMH and behavioral data were found. The Aβ level was related with the ReHo value of STG in SD-aMCI. MD-aMCI displayed different patterns of abnormal regional synchronization and more severe PWMH burden compared with SD-aMCI. Therefore aMCI is not a uniform disease entity, and MD-aMCI group may show more complicated pathologies than SD-aMCI group.
authors.affiliation: Department of Radiology, The 2nd Affiliated Hospital of Zhejiang University, School of Medicine, No.88 Jiefang Road, Shangcheng District, Hangzhou, 310009, China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Luo
authors.affiliation: Department of Radiology, The 2nd Affiliated Hospital of Zhejiang University, School of Medicine, No.88 Jiefang Road, Shangcheng District, Hangzhou, 310009, China.
authors.forename: Yerfan
authors.initials: Y
authors.lastname: Jiaerken
authors.affiliation: Department of Radiology, The 2nd Affiliated Hospital of Zhejiang University, School of Medicine, No.88 Jiefang Road, Shangcheng District, Hangzhou, 310009, China.
authors.forename: Peiyu
authors.initials: P
authors.lastname: Huang
authors.affiliation: Department of Radiology, The 2nd Affiliated Hospital of Zhejiang University, School of Medicine, No.88 Jiefang Road, Shangcheng District, Hangzhou, 310009, China.
authors.forename: Xiao Jun
authors.initials: XJ
authors.lastname: Xu
authors.affiliation: Department of Radiology, The 2nd Affiliated Hospital of Zhejiang University, School of Medicine, No.88 Jiefang Road, Shangcheng District, Hangzhou, 310009, China.
authors.forename: Tiantian
authors.initials: T
authors.lastname: Qiu
authors.affiliation: Department of Radiology, The 2nd Affiliated Hospital of Zhejiang University, School of Medicine, No.88 Jiefang Road, Shangcheng District, Hangzhou, 310009, China.
authors.forename: Yunlu
authors.initials: Y
authors.lastname: Jia
authors.affiliation: Department of Radiology, The 2nd Affiliated Hospital of Zhejiang University, School of Medicine, No.88 Jiefang Road, Shangcheng District, Hangzhou, 310009, China.
authors.forename: Zhujing
authors.initials: Z
authors.lastname: Shen
authors.affiliation: Department of Radiology, The 2nd Affiliated Hospital of Zhejiang University, School of Medicine, No.88 Jiefang Road, Shangcheng District, Hangzhou, 310009, China.
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Guan
authors.affiliation: Department of Neurology, The 2nd Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China.
authors.forename: Jiong
authors.initials: J
authors.lastname: Zhou
authors.affiliation: Department of Radiology, The 2nd Affiliated Hospital of Zhejiang University, School of Medicine, No.88 Jiefang Road, Shangcheng District, Hangzhou, 310009, China. zhangminming@zju.edu.cn.
authors.forename: Minming
authors.identifier: http://orcid.org/0000-0003-0145-7558
authors.initials: M
authors.lastname: Zhang
mesh_terms: D000368:Aged; D000647:Amnesia / Q000134:cerebrospinal fluid* / Q000000981:diagnostic imaging*; D016229:Amyloid beta-Peptides / Q000134:cerebrospinal fluid; D015415:Biomarkers / Q000134:cerebrospinal fluid; D001921:Brain / Q000000981:diagnostic imaging* / Q000503:physiopathology; D060825:Cognitive Dysfunction / Q000134:cerebrospinal fluid* / Q000000981:diagnostic imaging* / Q000523:psychology; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D009434:Neural Pathways / Q000000981:diagnostic imaging / Q000503:physiopathology; D009483:Neuropsychological Tests; D010446:Peptide Fragments / Q000134:cerebrospinal fluid; D010766:Phosphorylation; D012146:Rest; D066127:White Matter / Q000000981:diagnostic imaging* / Q000503:physiopathology; D016875:tau Proteins / Q000134:cerebrospinal fluid
chemical_list: D016229:Amyloid beta-Peptides; D015415:Biomarkers; C054369:MAPT protein, human; D010446:Peptide Fragments; C075222:amyloid beta-protein (1-42); D016875:tau Proteins
keywords: Alzheimer’s disease; CSF; Cognition; Magnetic resonance imaging; Mild cognitive impairment; Precuneus; White matter hyperintensities