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Cognitive reserve and Aβ1-42 in mild cognitive impairment (Argentina-Alzheimer’s Disease Neuroimaging Initiative)

Authors Harris P, Fernandez Suarez M, Surace E, Chrem Méndez P, Martín M, Clarens MF, Tapajóz F, Russo MJ, Campos J, Guinjoan S, Sevlever G, Allegri R

Received 10 March 2015

Accepted for publication 8 June 2015

Published 7 October 2015 Volume 2015:11 Pages 2599—2604

DOI https://doi.org/10.2147/NDT.S84292

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 3

Editor who approved publication: Dr Roger Pinder

Paula Harris,1,2 Marcos Fernandez Suarez,1 Ezequiel I Surace,1,2 Patricio Chrem Méndez,1 María Eugenia Martín,1 María Florencia Clarens,1 Fernanda Tapajóz,1,2 Maria Julieta Russo,1 Jorge Campos,1 Salvador M Guinjoan,1,2 Gustavo Sevlever,1 Ricardo F Allegri1,2

1Instituto de Investigaciones Neurológicas, 2Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina

Background: The purpose of this study was to investigate the relationship between cognitive reserve and concentration of Aβ1-42 in the cerebrospinal fluid (CSF) of patients with mild cognitive impairment, those with Alzheimer’s disease, and in control subjects.
Methods: Thirty-three participants from the Argentina-Alzheimer’s Disease Neuroimaging Initiative database completed a cognitive battery, the Cognitive Reserve Questionnaire (CRQ), and an Argentinian accentuation reading test (TAP-BA) as a measure of premorbid intelligence, and underwent lumbar puncture for CSF biomarker quantification.
Results: The CRQ significantly correlated with TAP-BA, education, and Aβ1-42. When considering Aβ1-42 levels, significant differences were found in CRQ scores; higher levels of CSF Aβ1-42 were associated with higher CRQ scores.
Conclusion: Reduced Aβ1-42 in CSF is considered as evidence of amyloid deposition in the brain. Previous results suggest that individuals with higher education, higher occupational attainment, and participation in leisure activities (cognitive reserve) have a reduced risk of developing Alzheimer’s disease. Our results support the notion that enhanced neural activity has a protective role in mild cognitive impairment, as evidenced by higher CSF Aβ1-42 levels in individuals with more cognitive reserve.

Keywords: amyloid, biomarkers, cerebrospinal fluid, Alzheimer’s disease
 

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