Indication of retrograde tau spreading along Braak stages and functional connectivity pathways.
Purpose: Tau pathology progression in Alzheimer's disease (AD) is explained through the network degeneration hypothesis and the neuropathological Braak stages; however, the compatibility of these models remains unclear. Methods: We utilized [18F]AV-1451 tau-PET scans of 39 subjects with AD and 39 se...
| Published in: | European Journal of Nuclear Medicine & Molecular Imaging Vol. 48; no. 7; pp. 2272 - 2283 |
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| Main Authors: | , , , , , |
| Format: | Journal Article |
| Published: |
Springer Nature
Jul2021
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| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=150670016&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 150670016 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 16197070 NPC jtl: European Journal of Nuclear Medicine & Molecular Imaging issn: 16197070 maglogo: N pubinfo: dt: Jul2021 vid: 48 iid: 7 pid: 237 pub: Springer Nature place: New York, New York artinfo: ui: 150670016 148156924 10.1007/s00259-020-05183-1 150670016 ppf: 2272 ppct: 11 formats: fmt: – @attributes: type: T – @attributes: type: P tig: atl: Indication of retrograde tau spreading along Braak stages and functional connectivity pathways. aug: au: Seemiller, Joseph Bischof, Gérard N. Hoenig, Merle C. Tahmasian, Masoud van Eimeren, Thilo Drzezga, Alexander affil: Department of Neurology, Geisinger Medical Center, 100 N. Academy Ave, 17822, Danville, PA, USA sug: ab: Purpose: Tau pathology progression in Alzheimer's disease (AD) is explained through the network degeneration hypothesis and the neuropathological Braak stages; however, the compatibility of these models remains unclear. Methods: We utilized [18F]AV-1451 tau-PET scans of 39 subjects with AD and 39 sex-matched amyloid-negative healthy controls (HC) in the ADNI (Alzheimer's Disease Neuroimaging Initiative) dataset. The peak cluster of tau-tracer uptake was identified in each Braak stage of neuropathological tau deposition and used to create a seed-based functional connectivity network (FCN) using 198 HC subjects, to identify healthy networks unaffected by neurodegeneration. Results: Voxel-wise tau deposition was both significantly higher inside relative to outside FCNs and correlated significantly and positively with levels of healthy functional connectivity. Within many isolated Braak stages and regions, the correlation between tau and intrinsic functional connectivity was significantly stronger than it was across the whole brain. In this way, each peak cluster of tau was related to multiple Braak stages traditionally associated with both earlier and later stages of disease. Conclusion: We show specificity of healthy FCN topography for AD-pathological tau as well as positive voxel-by-voxel correlations between pathological tau and healthy functional connectivity. We propose a model of "up- and downstream" functional tau progression, suggesting that tau pathology evolves along functional connectivity networks not only "downstream" (i.e., along the expected sequence of the established Braak stages) but also in part "upstream" or "retrograde" (i.e., against the expected sequence of the established Braak stages), with pathology in earlier Braak stages intensified by its functional relationship to later disease stages. pubtype: Academic Journal doctype: Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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