期刊
FRONTIERS IN AGING NEUROSCIENCE
卷 14, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fnagi.2022.782738
关键词
age; resting state functional MR imaging; functional connectivity; cortical atrophy; peak width of skeletonized mean diffusivity
资金
- Amgen
- Astra Zeneca
- Deutsche Gesetzliche Unfallversicherung (DGUV)
- Innovative medicine initiative (IMI) [116074]
- Foundation Leducq [16 CVD 03.]
- Novartis
- Pfizer
- Schiller
- Siemens
- Unilever
- Foerderverein zur Foerderung der HCHS e.V.
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [178316478]
- Bayer
- Badischen Anilin-& Sodafabrik (BASF)
- Deutsches Institut fur Ernahrungsforschung Potsdam-Rehbrucke (DIFE)
This study aimed to investigate the relationship between age, cortical thickness, white matter damage, and functional brain connectivity in healthy middle-aged to older adults. The findings suggest that higher age is associated with decreased functional connectivity, which may be mediated by cortical thickness for specific subnetworks.
Aging is accompanied by structural brain changes that are thought to underlie cognitive decline and dementia. Yet little is known regarding the association between increasing age, structural brain damage, and alterations of functional brain connectivity. The aim of this study was to evaluate whether cortical thickness and white matter damage as markers of age-related structural brain changes are associated with alterations in functional connectivity in non-demented healthy middle-aged to older adults. Therefore, we reconstructed functional connectomes from resting-state functional magnetic resonance imaging (MRI) (rsfMRI) data of 976 subjects from the Hamburg City Health Study, a prospective population-based study including participants aged 45-74 years from the metropolitan region Hamburg, Germany. We performed multiple linear regressions to examine the association of age, cortical thickness, and white matter damage quantified by the peak width of skeletonized mean diffusivity (PSMD) from diffusion tensor imaging on whole-brain network connectivity and four predefined resting state networks (default mode, dorsal, salience, and control network). In a second step, we extracted subnetworks with age-related decreased functional connectivity from these networks and conducted a mediation analysis to test whether the effect of age on these networks is mediated by decreased cortical thickness or PSMD. We observed an independent association of higher age with decreased functional connectivity, while there was no significant association of functional connectivity with cortical thickness or PSMD. Mediation analysis identified cortical thickness as a partial mediator between age and default subnetwork connectivity and functional connectivity within the default subnetwork as a partial mediator between age and executive cognitive function. These results indicate that, on a global scale, functional connectivity is not determined by structural damage in healthy middle-aged to older adults. There is a weak association of higher age with decreased functional connectivity which, for specific subnetworks, appears to be mediated by cortical thickness.
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