TY - JOUR
T1 - Influences of amyloid-β and tau on white matter neurite alterations in dementia with Lewy bodies
AU - Mak, Elijah
AU - Reid, Robert I.
AU - Przybelski, Scott A.
AU - Lesnick, Timothy G.
AU - Schwarz, Christopher G.
AU - Senjem, Matthew L.
AU - Raghavan, Sheelakumari
AU - Vemuri, Prashanthi
AU - Jack, Clifford R.
AU - Min, Hoon Ki
AU - Jain, Manoj K.
AU - Miyagawa, Toji
AU - Forsberg, Leah K.
AU - Fields, Julie A.
AU - Savica, Rodolfo
AU - Graff-Radford, Jonathan
AU - Jones, David T.
AU - Botha, Hugo
AU - St. Louis, Erik K.
AU - Knopman, David S.
AU - Ramanan, Vijay K.
AU - Dickson, Dennis W.
AU - Graff-Radford, Neill R.
AU - Ferman, Tanis J.
AU - Petersen, Ronald C.
AU - Lowe, Val J.
AU - Boeve, Bradley F.
AU - O’Brien, John T.
AU - Kantarci, Kejal
N1 - Publisher Copyright:
© The Author(s) 2024.
PY - 2024/12
Y1 - 2024/12
N2 - Dementia with Lewy bodies (DLB) is a neurodegenerative condition often co-occurring with Alzheimer’s disease (AD) pathology. Characterizing white matter tissue microstructure using Neurite Orientation Dispersion and Density Imaging (NODDI) may help elucidate the biological underpinnings of white matter injury in individuals with DLB. In this study, diffusion tensor imaging (DTI) and NODDI metrics were compared in 45 patients within the dementia with Lewy bodies spectrum (mild cognitive impairment with Lewy bodies (n = 13) and probable dementia with Lewy bodies (n = 32)) against 45 matched controls using conditional logistic models. We evaluated the associations of tau and amyloid-β with DTI and NODDI parameters and examined the correlations of AD-related white matter injury with Clinical Dementia Rating (CDR). Structural equation models (SEM) explored relationships among age, APOE ε4, amyloid-β, tau, and white matter injury. The DLB spectrum group exhibited widespread white matter abnormalities, including reduced fractional anisotropy, increased mean diffusivity, and decreased neurite density index. Tau was significantly associated with limbic and temporal white matter injury, which was, in turn, associated with worse CDR. SEM revealed that amyloid-β exerted indirect effects on white matter injury through tau. We observed widespread disruptions in white matter tracts in DLB that were not attributed to AD pathologies, likely due to α-synuclein-related injury. However, a fraction of the white matter injury could be attributed to AD pathology. Our findings underscore the impact of AD pathology on white matter integrity in DLB and highlight the utility of NODDI in elucidating the biological basis of white matter injury in DLB.
AB - Dementia with Lewy bodies (DLB) is a neurodegenerative condition often co-occurring with Alzheimer’s disease (AD) pathology. Characterizing white matter tissue microstructure using Neurite Orientation Dispersion and Density Imaging (NODDI) may help elucidate the biological underpinnings of white matter injury in individuals with DLB. In this study, diffusion tensor imaging (DTI) and NODDI metrics were compared in 45 patients within the dementia with Lewy bodies spectrum (mild cognitive impairment with Lewy bodies (n = 13) and probable dementia with Lewy bodies (n = 32)) against 45 matched controls using conditional logistic models. We evaluated the associations of tau and amyloid-β with DTI and NODDI parameters and examined the correlations of AD-related white matter injury with Clinical Dementia Rating (CDR). Structural equation models (SEM) explored relationships among age, APOE ε4, amyloid-β, tau, and white matter injury. The DLB spectrum group exhibited widespread white matter abnormalities, including reduced fractional anisotropy, increased mean diffusivity, and decreased neurite density index. Tau was significantly associated with limbic and temporal white matter injury, which was, in turn, associated with worse CDR. SEM revealed that amyloid-β exerted indirect effects on white matter injury through tau. We observed widespread disruptions in white matter tracts in DLB that were not attributed to AD pathologies, likely due to α-synuclein-related injury. However, a fraction of the white matter injury could be attributed to AD pathology. Our findings underscore the impact of AD pathology on white matter integrity in DLB and highlight the utility of NODDI in elucidating the biological basis of white matter injury in DLB.
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U2 - 10.1038/s41531-024-00684-4
DO - 10.1038/s41531-024-00684-4
M3 - Article
AN - SCOPUS:85189491799
SN - 2373-8057
VL - 10
JO - npj Parkinson's Disease
JF - npj Parkinson's Disease
IS - 1
M1 - 76
ER -