• Solveig Horstmann, Leila Budig, Humphrey Gardner, James Koziol, Michael Deuschle, Claudia Schilling, and Simone Wagner.
• Department of Neurology, Medical School, University of Heidelberg, Heidelberg, Germany.
• Int Psychogeriatr. 2010 Sep 1;22(6):966-72.

BackgroundDeposition of amyloid beta in senile plaques and in cerebral blood vessels is one hallmark of the pathogenesis of Alzheimer's disease (AD). The ability of several matrix metalloproteinases (MMPs) to degrade amyloid precursor protein leading to aggregation of amyloid beta, as well as the increased expression of MMPs in post mortem brain tissue of Alzheimer's patients, indicate that MMPs play an important role in the pathogenesis of AD.MethodsWe investigated levels of MMP-2,-3,-9 and -10 in plasma and cerebrospinal fluid (CSF) of AD patients (n = 14) by gelatin and casein zymography. Comparisons between AD patients and controls relative to levels of MMP-2, MMP-3, MMP-9, and MMP-10 were made with Wilcoxon rank statistics. Pearson correlations were computed as measures of association.ResultsMMP-3 in AD was significantly elevated in plasma (p = 0.006) and there was a trend towards increase in CSF (p = 0.05). MMP-2 in CSF of AD patients was significantly decreased (p = 0.02) while levels in plasma remained unchanged. MMP-9 and MMP-10 could not be detected in CSF; MMP-10 was unchanged in plasma, but MMP-9 was significantly decreased (p = 0.02).ConclusionsThese findings constitute further evidence for the important role of MMPs in the pathogenesis of AD.

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