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Neuroserpin binds Abeta and is a neuroprotective component of amyloid plaques in Alzheimer disease.

J Biol Chem. 2006 Sep 29;281(39):29268-77. Epub 2006 Jul 17
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摘要


Alzheimer disease is characterized by extracellular plaques composed of Abeta peptides. We show here that these plaques also contain the serine protease inhibitor neuroserpin and that neuroserpin forms a 1:1 binary complex with the N-terminal or middle parts of the Abeta(1-42) peptide. This complex inactivates neuroserpin as an inhibitor of tissue plasminogen activator and blocks the loop-sheet polymerization process that is characteristic of members of the serpin superfamily. In contrast neuroserpin accelerates the aggregation of Abeta(1-42) with the resulting species having an appearance that is distinct from the mature amyloid fibril. Neuroserpin reduces the cytotoxicity of Abeta(1-42) when assessed using standard cell assays, and the interaction has been confirmed in vivo in novel Drosophila models of disease. Taken together, these data show that neuroserpin interacts with Abeta(1-42) to form off-pathway non-toxic oligomers and so protects neurons in Alzheimer disease.

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