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Longitudinal default mode sub-networks in the language and visual variants of Alzheimer's disease.
Sintini, Irene; Corriveau-Lecavalier, Nick; Jones, David T; Machulda, Mary M; Gunter, Jeffrey L; Schwarz, Christopher G; Botha, Hugo; Carlos, Arenn F; Kamykowski, Michael G; Singh, Neha Atulkumar; Petersen, Ronald C; Jack, Clifford R; Lowe, Val J; Graff-Radford, Jonathan; Josephs, Keith A; Whitwell, Jennifer L.
Afiliação
  • Sintini I; Department of Radiology, Mayo Clinic, Rochester, MN 55905, USA.
  • Corriveau-Lecavalier N; Department of Neurology, Mayo Clinic, Rochester, MN 55905, USA.
  • Jones DT; Department of Radiology, Mayo Clinic, Rochester, MN 55905, USA.
  • Machulda MM; Department of Neurology, Mayo Clinic, Rochester, MN 55905, USA.
  • Gunter JL; Department of Psychiatry and Psychology, Mayo Clinic, Rochester, MN 55905, USA.
  • Schwarz CG; Department of Radiology, Mayo Clinic, Rochester, MN 55905, USA.
  • Botha H; Department of Radiology, Mayo Clinic, Rochester, MN 55905, USA.
  • Carlos AF; Department of Neurology, Mayo Clinic, Rochester, MN 55905, USA.
  • Kamykowski MG; Department of Neurology, Mayo Clinic, Rochester, MN 55905, USA.
  • Singh NA; Department of Information Technology, Mayo Clinic, Rochester, MN 55905, USA.
  • Petersen RC; Department of Neurology, Mayo Clinic, Rochester, MN 55905, USA.
  • Jack CR; Department of Neurology, Mayo Clinic, Rochester, MN 55905, USA.
  • Lowe VJ; Department of Radiology, Mayo Clinic, Rochester, MN 55905, USA.
  • Graff-Radford J; Department of Radiology, Mayo Clinic, Rochester, MN 55905, USA.
  • Josephs KA; Department of Neurology, Mayo Clinic, Rochester, MN 55905, USA.
  • Whitwell JL; Department of Neurology, Mayo Clinic, Rochester, MN 55905, USA.
Brain Commun ; 6(2): fcae005, 2024.
Article em En | MEDLINE | ID: mdl-38444909
ABSTRACT
Disruption of the default mode network is a hallmark of Alzheimer's disease, which has not been extensively examined in atypical phenotypes. We investigated cross-sectional and 1-year longitudinal changes in default mode network sub-systems in the visual and language variants of Alzheimer's disease, in relation to age and tau. Sixty-one amyloid-positive Alzheimer's disease participants diagnosed with posterior cortical atrophy (n = 33) or logopenic progressive aphasia (n = 28) underwent structural MRI, resting-state functional MRI and [18F]flortaucipir PET. One-hundred and twenty-two amyloid-negative cognitively unimpaired individuals and 60 amyloid-positive individuals diagnosed with amnestic Alzheimer's disease were included as controls and as a comparison group, respectively, and had structural and resting-state functional MRI. Forty-one atypical Alzheimer's disease participants, 26 amnestic Alzheimer's disease participants and 40 cognitively unimpaired individuals had one follow-up functional MRI ∼1-2 years after the baseline scan. Default mode network connectivity was calculated using the dual regression method for posterior, ventral, anterior ventral and anterior dorsal sub-systems derived from independent component analysis. A global measure of default mode network connectivity, the network failure quotient, was also calculated. Linear mixed-effects models and voxel-based analyses were computed for each connectivity measure. Both atypical and amnestic Alzheimer's disease participants had lower cross-sectional posterior and ventral and higher anterior dorsal connectivity and network failure quotient relative to cognitively unimpaired individuals. Age had opposite effects on connectivity in Alzheimer's disease participants and cognitively unimpaired individuals. While connectivity declined with age in cognitively unimpaired individuals, younger Alzheimer's disease participants had lower connectivity than the older ones, particularly in the ventral default mode network. Greater baseline tau-PET uptake was associated with lower ventral and anterior ventral default mode network connectivity in atypical Alzheimer's disease. Connectivity in the ventral default mode network declined over time in atypical Alzheimer's disease, particularly in older participants, with lower tau burden. Voxel-based analyses validated the findings of higher anterior dorsal default mode network connectivity, lower posterior and ventral default mode network connectivity and decline in ventral default mode network connectivity over time in atypical Alzheimer's disease. Visuospatial symptoms were associated with default mode network connectivity disruption. In summary, default mode connectivity disruption was similar between atypical and amnestic Alzheimer's disease variants, and discriminated Alzheimer's disease from cognitively unimpaired individuals, with decreased posterior and increased anterior connectivity and with disruption more pronounced in younger participants. The ventral default mode network declined over time in atypical Alzheimer's disease, suggesting a shift in default mode network connectivity likely related to tau pathology.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Brain Commun Ano de publicação: 2024 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Brain Commun Ano de publicação: 2024 Tipo de documento: Article