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Type 2 diabetes mellitus and biomarkers of neurodegeneration

Citation

Moran, C and Beare, R and Phan, TG and Bruce, DG and Callisaya, ML and Srikanth, V, On behalf of the Alzheimer’s Disease Neuroimaging Initiative (ADNI), Type 2 diabetes mellitus and biomarkers of neurodegeneration, Neurology, 85 pp. 1-8. ISSN 0028-3878 (2015) [Refereed Article]

Copyright Statement

Copyright 2015 American Academy of Neurology

DOI: doi:10.1212/WNL.0000000000001982

Abstract

Objective: Our objective was to investigate whether type 2 diabetes mellitus (T2DM) influences neurodegeneration in a manner similar to Alzheimer disease (AD), by promoting brain β-amyloid (Aβ) or tau.

Methods: We studied the cross-sectional associations of T2DM with cortical thickness, brain Aβ load, and CSF levels of Aβ and tau in a sample of people from the Alzheimer's Disease Neuroimaging Initiative with diagnoses of AD dementia, mild cognitive impairment, and normal cognition. All (n = 816) received MRI, and a subsample underwent brain amyloid imaging (n = 102) and CSF Aβ and tau measurements (n = 415). Analyses were performed across and within cognitive diagnostic strata.

Results: There were 124 people with T2DM (mean age 75.5 years) and 692 without T2DM (mean age 74.1 years). After adjusting for age, sex, total intracranial volume, APO ε4 status, and cognitive diagnosis, T2DM was associated with lower bilateral frontal and parietal cortical thickness (mL) (β = -0.03, p = 0.01). T2DM was not associated with 11C Pittsburgh compound B standardized uptake value ratio (AU) in any brain region or with CSF Aβ42 levels (pg/mL). T2DM was associated with greater CSF total tau (pg/mL) (β = 16.06, p = 0.04) and phosphorylated tau (β = 5.84, p = 0.02). The association between T2DM and cortical thickness was attenuated by 15% by the inclusion of phosphorylated tau.

Conclusions: T2DM may promote neurodegeneration independent of AD dementia diagnosis, and its effect may be driven by tau phosphorylation. The mechanisms through which T2DM may promote tau phosphorylation deserve further study.

Item Details

Item Type:Refereed Article
Keywords:diabetes dementia
Research Division:Medical and Health Sciences
Research Group:Clinical Sciences
Research Field:Geriatrics and Gerontology
Objective Division:Health
Objective Group:Specific Population Health (excl. Indigenous Health)
Objective Field:Health Related to Ageing
UTAS Author:Callisaya, ML (Dr Michele Callisaya)
UTAS Author:Srikanth, V (Dr Velandai Srikanth)
ID Code:103242
Year Published:2015
Web of Science® Times Cited:67
Deposited By:Menzies Institute for Medical Research
Deposited On:2015-09-29
Last Modified:2017-11-03
Downloads:0

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