Abstract:
:Mounting evidence indicates that serum cholesterol and other risk factors for cardiovascular disease intensify normative trajectories of age-related cognitive decline. However, the neural mechanisms by which this occurs remain largely unknown. To understand the impact of cholesterol on brain networks, we applied graph theory to resting-state fMRI in a large sample of early- to mid-life Veterans (N = 206, Meanage = 32). A network emerged (centered on the banks of the superior temporal sulcus) that evidenced age-related decoupling (i.e., decreased network connectivity with age), but only in participants with clinically-elevated total cholesterol (≥180 mg/dL). Crucially, decoupling in this network corresponded to greater day-to-day disability and mediated age-related declines in psychomotor speed. Finally, examination of network organization revealed a pattern of age-related dedifferentiation for the banks of the superior temporal sulcus, again present only with higher cholesterol. More specifically, age was related to decreasing within-module communication (indexed by Within-Module Degree Z-Score) and increasing between-module communication (indexed by Participation Coefficient), but only in participants with clinically-elevated cholesterol. Follow-up analyses indicated that all findings were driven by low-density lipoprotein (LDL) levels, rather than high-density lipoprotein (HDL) or triglycerides, which is interesting as LDL levels have been linked to increased risk for cardiovascular disease, whereas HDL levels appear inversely related to such disease. These findings provide novel insight into the deleterious effects of cholesterol on brain health and suggest that cholesterol accelerates the impact of age on neural trajectories by disrupting connectivity in circuits implicated in integrative processes and behavioral control. Hum Brain Mapp 38:3249-3261, 2017. © 2017 Wiley Periodicals, Inc.
journal_name
Hum Brain Mappjournal_title
Human brain mappingauthors
Spielberg JM,Sadeh N,Leritz EC,McGlinchey RE,Milberg WP,Hayes JP,Salat DHdoi
10.1002/hbm.23587subject
Has Abstractpub_date
2017-06-01 00:00:00pages
3249-3261issue
6eissn
1065-9471issn
1097-0193journal_volume
38pub_type
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journal_title:Human brain mapping
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pub_type: 杂志文章
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更新日期:2010-08-01 00:00:00
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journal_title:Human brain mapping
pub_type: 杂志文章
doi:10.1002/hbm.20782
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doi:10.1002/hbm.24883
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pub_type: 杂志文章,多中心研究
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pub_type: 杂志文章
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