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Title
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Neurogranin as cerebrospinal fluid biomarker for Alzheimer disease : an assay comparison study
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Author
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Abstract
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| Background: Neurogranin in cerebrospinal fluid (CSF) correlates with cognitive decline and is a potential novel biomarker for Alzheimer disease (AD) dementia. We investigated the analytical and diagnostic performance of 3 commonly used neurogranin assays in the same cohort of patients to improve the interpretability of CSF neurogranin test results. Methods: The neurogranin Singulex assay from Washington University, St. Louis, MO (WashU); ELISA from ADx Neurosciences; and ELISA from Gothenburg University, Mölndal, Sweden (UGot), were compared using silver staining and Western blot after gel electrophoresis. Clinical performance of the 3 assays was compared in samples from individuals diagnosed with subjective cognitive decline (n = 22), and in patients with AD (n = 22), frontotemporal dementia (n = 22), dementia with Lewy bodies (n = 22), or vascular dementia (n = 20), adjusted for sex and age. Results: The assays detected different epitopes of neurogranin: the WashU assay the N-terminal part of neurogranin (S10-D23) and a C-terminal part (G49-G60), the ADx assay C-terminal neurogranin truncated at P75, and the UGot assay the C-terminal neurogranin with intact ending (D78). Spearman ρ was 0.95 between ADx and WashU, 0.87 between UGot and WashU, and 0.81 between UGot and ADx. ANCOVA (analysis of covariance) showed group differences for ranked neurogranin concentrations in each assay (all P < 0.05), with specific increases in AD. Conclusions: Although the 3 assays target different epitopes on neurogranin and have different calibrators, the high correlations and the similar group differences suggest that the different forms of neurogranin in CSF carry similar diagnostic information, at least in the context of neurodegenerative diseases. |
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Language
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English
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Source (journal)
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Clinical chemistry : international journal of laboratory medicine and molecular diagnostics / American Association of Clinical Chemists. - Winston-Salem, N.C., 1955, currens
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Publication
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Winston-Salem, N.C.
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2018
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ISSN
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0009-9147
[print]
1530-8561
[online]
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DOI
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10.1373/CLINCHEM.2017.283028
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Volume/pages
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64
:6
(2018)
, p. 927-937
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ISI
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000448292100010
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Pubmed ID
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29523639
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Full text (Publisher's DOI)
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Full text (open access)
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