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Regional structural hypo- and hyperconnectivity of frontal–striatal and frontal–thalamic pathways in behavioral variant frontotemporal dementia

Jakabek, David; Power, Brian D.; Macfarlane, Matthew D.; Walterfang, Mark; Velakoulis, Dennis; van Westen, Danielle LU ; Lätt, Jimmy LU ; Nilsson, Markus LU ; Looi, Jeffrey C.L. and Santillo, Alexander F. LU (2018) In Human Brain Mapping 39(10). p.4083-4093
Abstract

Behavioral variant frontotemporal dementia (bvFTD) has been predominantly considered as a frontotemporal cortical disease, with limited direct investigation of frontal–subcortical connections. We aim to characterize the grey and white matter components of frontal–thalamic and frontal–striatal circuits in bvFTD. Twenty-four patients with bvFTD and 24 healthy controls underwent morphological and diffusion imaging. Subcortical structures were manually segmented according to published protocols. Probabilistic pathways were reconstructed separately from the dorsolateral, orbitofrontal and medial prefrontal cortex to the striatum and thalamus. Patients with bvFTD had smaller cortical and subcortical volumes, lower fractional anisotropy, and... (More)

Behavioral variant frontotemporal dementia (bvFTD) has been predominantly considered as a frontotemporal cortical disease, with limited direct investigation of frontal–subcortical connections. We aim to characterize the grey and white matter components of frontal–thalamic and frontal–striatal circuits in bvFTD. Twenty-four patients with bvFTD and 24 healthy controls underwent morphological and diffusion imaging. Subcortical structures were manually segmented according to published protocols. Probabilistic pathways were reconstructed separately from the dorsolateral, orbitofrontal and medial prefrontal cortex to the striatum and thalamus. Patients with bvFTD had smaller cortical and subcortical volumes, lower fractional anisotropy, and higher mean diffusivity metrics, which is consistent with disruptions in frontal–striatal–thalamic pathways. Unexpectedly, regional volumes of the striatum and thalamus connected to the medial prefrontal cortex were significantly larger in bvFTD (by 135% in the striatum, p =.032, and 217% in the thalamus, p =.004), despite smaller dorsolateral prefrontal cortex connected regional volumes (by 67% in the striatum, p =.002, and 65% in the thalamus, p =.020), and inconsistent changes in orbitofrontal cortex connected regions. These unanticipated findings may represent compensatory or maladaptive remodeling in bvFTD networks. Comparisons are made to other neuropsychiatric disorders suggesting a common mechanism of changes in frontal–subcortical networks; however, longitudinal studies are necessary to test this hypothesis.

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organization
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type
Contribution to journal
publication status
published
subject
keywords
behavioral variant frontotemporal dementia, connectivity, DTI, MRI, probabilistic tractography
in
Human Brain Mapping
volume
39
issue
10
pages
11 pages
publisher
Wiley-Blackwell
external identifiers
  • scopus:85052942647
ISSN
1065-9471
DOI
10.1002/hbm.24233
language
English
LU publication?
yes
id
184ffe04-deb3-47ad-b43c-030ddbb1e5c0
date added to LUP
2018-10-09 14:27:41
date last changed
2019-01-06 14:09:00
@article{184ffe04-deb3-47ad-b43c-030ddbb1e5c0,
  abstract     = {<p>Behavioral variant frontotemporal dementia (bvFTD) has been predominantly considered as a frontotemporal cortical disease, with limited direct investigation of frontal–subcortical connections. We aim to characterize the grey and white matter components of frontal–thalamic and frontal–striatal circuits in bvFTD. Twenty-four patients with bvFTD and 24 healthy controls underwent morphological and diffusion imaging. Subcortical structures were manually segmented according to published protocols. Probabilistic pathways were reconstructed separately from the dorsolateral, orbitofrontal and medial prefrontal cortex to the striatum and thalamus. Patients with bvFTD had smaller cortical and subcortical volumes, lower fractional anisotropy, and higher mean diffusivity metrics, which is consistent with disruptions in frontal–striatal–thalamic pathways. Unexpectedly, regional volumes of the striatum and thalamus connected to the medial prefrontal cortex were significantly larger in bvFTD (by 135% in the striatum, p =.032, and 217% in the thalamus, p =.004), despite smaller dorsolateral prefrontal cortex connected regional volumes (by 67% in the striatum, p =.002, and 65% in the thalamus, p =.020), and inconsistent changes in orbitofrontal cortex connected regions. These unanticipated findings may represent compensatory or maladaptive remodeling in bvFTD networks. Comparisons are made to other neuropsychiatric disorders suggesting a common mechanism of changes in frontal–subcortical networks; however, longitudinal studies are necessary to test this hypothesis.</p>},
  author       = {Jakabek, David and Power, Brian D. and Macfarlane, Matthew D. and Walterfang, Mark and Velakoulis, Dennis and van Westen, Danielle and Lätt, Jimmy and Nilsson, Markus and Looi, Jeffrey C.L. and Santillo, Alexander F.},
  issn         = {1065-9471},
  keyword      = {behavioral variant frontotemporal dementia,connectivity,DTI,MRI,probabilistic tractography},
  language     = {eng},
  number       = {10},
  pages        = {4083--4093},
  publisher    = {Wiley-Blackwell},
  series       = {Human Brain Mapping},
  title        = {Regional structural hypo- and hyperconnectivity of frontal–striatal and frontal–thalamic pathways in behavioral variant frontotemporal dementia},
  url          = {http://dx.doi.org/10.1002/hbm.24233},
  volume       = {39},
  year         = {2018},
}