, Volume 114, Issue 5, pp 621-628
Date: 25 Jan 2007

Reduced CSF carboxyterminally truncated Aβ peptides in frontotemporal lobe degenerations

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Summary.

Cerebrospinal fluid (CSF) carboxyterminally truncated amyloid-beta (Aβ) peptides, Aβ1-42 and tau protein were evaluated in 30 patients with frontotemporal lobe degenerations (FTLD), 30 Alzheimer’s disease (AD) patients and 30 non-demented disease controls (NDC) by Aβ-SDS-PAGE/immunoblot as well as commercial ELISAs for Aβ1-42 and total tau. FTLD displayed a significant drop of Aβ1-37 (p = 2.7 × 10−4), Aβ1-38 (p = 4.2 × 10−5) and Aβ1-42 (p = 3.3 × 10−4). Aβ1-42 was selectively decreased in AD (p = 8.5 × 10−10). Decreased Aβ1-38 enabled contrasts of beyond 85% to distinguish FTLD from AD and NDC patients, alone or in combination. Accordingly, low CSF Aβ1-37 and Aβ1-38 represent a biomarker candidate for FTLD and may reflect disease-specific changes of APP metabolism. Further validation should be carried out on dementias other than AD, diagnostically relevant control groups without dementia and without any evident affection of the central nervous system and subgroups of FTLD. Moreover, independent methods of measurement should be applied to CSF Aβ1-38.