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Extracellular vesicle biomarkers of Alzheimer's disease associated with sub‐clinical cognitive decline in late middle age
Author(s) -
Eren Erden,
Hunt Jack F. V.,
Shardell Michelle,
Chawla Sahil,
Tran Joyce,
Gu Jeffrey,
Vogt Nick M.,
Johnson Sterling C.,
Bendlin Barbara B.,
Kapogiannis Dimitrios
Publication year - 2020
Publication title -
alzheimer's and dementia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.713
H-Index - 118
eISSN - 1552-5279
pISSN - 1552-5260
DOI - 10.1002/alz.12130
Subject(s) - biomarker , cognitive decline , medicine , cognition , extracellular vesicle , area under the curve , extracellular vesicles , oncology , effects of sleep deprivation on cognitive performance , disease , cognitive impairment , alzheimer's disease , psychology , biology , dementia , psychiatry , microrna , biochemistry , microvesicles , gene , microbiology and biotechnology
Neuronal extracellular vesicle (nEV) tau and insulin signaling biomarkers may detect preclinical Alzheimer's disease and age‐associated cognitive decline. Methods This case‐control study used repeated serum samples from 73 cognitively declining and 73 stable Wisconsin Registry for Alzheimer's Prevention participants (62.4 ± 6.3 years old). We immunocaptured nEVs; measured tau and insulin signaling biomarkers; and examined biomarker differences by group, their performance in group classification in training and test datasets (97, 49 individuals, respectively), and whether they predict cognitive performance change. Results Declining compared to stable individuals showed higher baseline total, p231‐, and p181‐tau with older age and higher annualized change for p‐IR and p‐IGF‐1R. Combining biomarkers classified decliners with 94% area under the curve (AUC), 86.0% sensitivity and 86.7% specificity, in training data, and 75% AUC, 71.4% sensitivity, and 77.3% specificity, in test data. Insulin biomarkers predicted cognitive performance change prospectively. Discussion Combining nEV biomarkers can identify individuals with age‐associated cognitive decline.