Publication in detail

Nat Med 2015 Aug 17. doi: 10.1038/nm.3924. [Epub ahead of print]

APP intracellular domain-WAVE1 pathway reduces amyloid-β production.

Ceglia, I; Reitz, C; Gresack, J; Ahn, JH; Bustos, V; Bleck, M; Zhang, X; Martin, G; Simon, SM; Nairn, AC; Greengard, P; Kim, Y

The Rockefeller University, New York, USA; Columbia University, New York, USA; Ewha Womans University, Seoul, South Korea; Yale University School of Medicine, New Haven, Connecticut, USA.

Abstract:
An increase in amyloid-β (Aβ) production is a major pathogenic mechanism associated with Alzheimer's disease (AD), but little is known about possible homeostatic control of the amyloidogenic pathway. Here we report that the amyloid precursor protein (APP) intracellular domain (AICD) downregulates Wiskott-Aldrich syndrome protein (WASP)-family verprolin homologous protein 1 (WAVE1 or WASF1) as part of a negative feedback mechanism to limit Aβ production. The AICD binds to the Wasf1 promoter, negatively regulates its transcription and downregulates Wasf1 mRNA and protein expression in Neuro 2a (N2a) cells. WAVE1 interacts and colocalizes with APP in the Golgi apparatus. Experimentally reducing WAVE1 in N2a cells decreased the budding of APP-containing vesicles and reduced cell-surface APP, thereby reducing the production of Aβ. WAVE1 downregulation was observed in mouse models of AD. Reduction of Wasf1 gene expression dramatically reduced Aβ levels and restored memory deficits in a mouse model of AD. A decrease in amounts of WASF1 mRNA was also observed in human AD brains, suggesting clinical relevance of the negative feedback circuit involved in homeostatic regulation of Aβ production.

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