Clathrin adaptor AP-1-mediated Golgi export of amyloid precursor protein is crucial for the production of neurotoxic amyloid fragments.

Januário, Yunan C 
Eden, Jessica 
de Oliveira, Luan S 
De Pace, Raffaella 
Tavares, Lucas A 

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One of the hallmarks of Alzheimer's disease is the accumulation of toxic amyloid-β (Aβ) peptides in extracellular plaques. The direct precursor of Aβ is the carboxyl-terminal fragment β (or C99) of the amyloid precursor protein (APP). C99 is detected at elevated levels in Alzheimer's disease brains, and its intracellular accumulation has been linked to early neurotoxicity independently of Aβ. Despite this, the causes of increased C99 levels are poorly understood. Here, we demonstrate that APP interacts with the clathrin vesicle adaptor AP-1 (adaptor protein 1), and we map the interaction sites on both proteins. Using quantitative kinetic trafficking assays, established cell lines and primary neurons, we also show that this interaction is required for the transport of APP from the trans-Golgi network to endosomes. In addition, disrupting AP-1-mediated transport of APP alters APP processing and degradation, ultimately leading to increased C99 production and Aβ release. Our results indicate that AP-1 regulates the subcellular distribution of APP, altering its processing into neurotoxic fragments.

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Alzheimer’s disease, adaptor protein 1, amyloid precursor protein, endosome, protein trafficking (Golgi), Adaptor Proteins, Vesicular Transport, Alzheimer Disease, Amyloid Precursor Protein Secretases, Amyloid beta-Peptides, Amyloid beta-Protein Precursor, Amyloidosis, Golgi Apparatus, Humans, Neurotoxicity Syndromes, Transcription Factor AP-1
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J Biol Chem
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Elsevier BV
Biotechnology and Biological Sciences Research Council (BB/M011194/1)
Wellcome Trust (210481/Z/18/Z)