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  • Title: Cerebrospinal fluid amyloid beta(1-42) levels in the mild cognitive impairment stage of Alzheimer's disease.
    Author: Maruyama M, Arai H, Sugita M, Tanji H, Higuchi M, Okamura N, Matsui T, Higuchi S, Matsushita S, Yoshida H, Sasaki H.
    Journal: Exp Neurol; 2001 Dec; 172(2):433-6. PubMed ID: 11716567.
    Abstract:
    Cerebrospinal fluid (CSF) levels of amyloid beta-protein ending at amino acid position 42 (CSF-A beta(1-42)) and CSF-tau levels were quantified by sandwich ELISAs in 19 patients with mild cognitive impairment (MCI) who eventually developed Alzheimer's disease (AD) on follow-up as well as in 15 age-matched normal controls and 54 AD patients at diverse stages of the disease. In the present study, the annual conversion rate was approximately 15%. The CSF-A beta(1-42) levels did not differ significantly between the normal control group and the MCI group, however, these values declined significantly once AD became clinically overt. In contrast to CSF-Abeta(1-42), CSF-tau levels were significantly increased in the MCI stage, and these values continued to be elevated thereafter, indicating that increased levels of CSF-tau may help in detecting MCI subjects who are predicted to develop AD. We propose that CSF-tau and CSF-A beta(1-42) must be used as two distinct biomarkers that should be applied appropriately in clinical settings.
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