| Performance of Aβ1-40, Aβ1-42, Total Tau, and Phosphorylated Tau as Predictors of Dementia in a Cohort of Patients with Mild Cognitive Impairment. | |
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MedLine Citation:
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PMID: 22232006 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Mild cognitive impairment (MCI) is a common condition in the elderly which may remain stable along time (MCI-MCI) or evolve into Alzheimer's disease (MCI-AD) or other dementias. Cerebrospinal fluid (CSF) classical biomarkers, i.e., amyloid-β 1-42 (Aβ1-42), total tau (t-tau), and phosphorylated tau (p-tau) reflect the neuropathological changes taking place in AD brains, thus disclosing the disease in its prodromal phase. With the aim to evaluate the power of each biomarker and/or their combination in predicting AD progression, we have measured CSF Aβ1-40, Aβ1-42, t-tau, and p-tau in patients with AD, MCI-MCI, MCI-AD, and other neurological diseases without dementia (OND) followed up for four years. Aβ1-42 levels were significantly lower in AD and MCI-AD than in MCI-MCI. T-tau and p-tau levels were significantly increased in AD and MCI-AD versus OND and MCI-MCI. The Aβ1-42/Aβ1-40 ratio showed a significant decrease in AD and MCI-AD as compared to MCI-MCI. Both Aβ1-42/t-tau and Aβ1-42/p-tau ratios showed significantly decreased values in AD and MCI-AD with respect to OND and MCI-MCI. Aβ1-42/p-tau ratio was the best parameter for discriminating MCI-AD from MCI-MCI (sensitivity 81%, specificity 95%), being also correlated with the annual change rate in the Mini Mental State Examination score (MMSE-ACR, rS = -0.71, p < 0.0001). Survival analysis showed that 81% of MCI with a low Aβ1-42/p-tau ratio (<1372) progressed to AD. The best model of logistic regression analysis retained Aβ1-42 and p-tau (sensitivity 75%, 95%CI: 70-80%; specificity 96%, 95%CI: 94-98%). We can conclude that Aβ1-42 and p-tau reliably predict conversion to AD in MCI patients. |
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Authors:
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Lucilla Parnetti; Davide Chiasserini; Paolo Eusebi; David Giannandrea; Gianni Bellomo; Claudia De Carlo; Chiara Padiglioni; Sara Mastrocola; Viviana Lisetti; Paolo Calabresi |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-1-9 |
Journal Detail:
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Title: Journal of Alzheimer's disease : JAD Volume: - ISSN: 1875-8908 ISO Abbreviation: - Publication Date: 2012 Jan |
Date Detail:
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Created Date: 2012-1-10 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9814863 Medline TA: J Alzheimers Dis Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Clinica Neurologica, Università degli Studi di Perugia, Italy. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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