Abstract
Recent data suggest that immunological mechanisms may be implicated in the pathogenesis of Alzheimer's disease (AD). We tested the presence of circulating immune complexes (CIC) in the sera from dementia and Down's syndrome (DS) patients and age-matched controls using two methods: C1q-binding Elisa (C1qB-Elisa) and conglutinin-binding Elisa (KgB-Elisa). The probable AD and multi-infarct dementia (MID) patients had more frequently CIC in their sera as compared to elderly non-demented subjects (Chi-square; P<0.05). The highest frequency of positive findings was detected for 10 DS patients (8 KgB-Elisa and 7 C1qB-Elisa positive) whereas only 1 of 10 young controls showed C1qB-positivity. In the AD patients the cognitive decline as assessed by the Mini-Mental Status test correlated significantly with CIC values. The study supports the view that systemic autoimmune mechanisms may be involved, at least partly, in dementing processes.
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