Noncanonical function of an autophagy protein prevents spontaneous Alzheimer’s disease

Bradlee L. Heckmann, Brett J. W. Teubner, Emilio Boada-Romero, Bart Tummers, Clifford Guy, Patrick Fitzgerald, Ulrike Mayer, Simon Carding, Stanislav S. Zakharenko, Thomas Wileman, Douglas R. Green

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Abstract

Noncanonical functions of autophagy proteins have been implicated in neurodegenerative conditions, including Alzheimer’s disease (AD). The WD domain of the autophagy protein Atg16L is dispensable for canonical autophagy but required for its noncanonical functions. Two-year-old mice lacking this domain presented with robust β-amyloid (Aβ) pathology, tau hyperphosphorylation, reactive microgliosis, pervasive neurodegeneration, and severe behavioral and memory deficiencies, consistent with human disease. Mechanistically, we found this WD domain was required for the recycling of Aβ receptors in primary microglia. Pharmacologic suppression of neuroinflammation reversed established memory impairment and markers of disease pathology in this novel AD model. Therefore, loss of the Atg16L WD domain drives spontaneous AD in mice, and inhibition of neuroinflammation is a potential therapeutic approach for treating neurodegeneration and memory loss. A decline in expression of ATG16L in the brains of human patients with AD suggests the possibility that a similar mechanism may contribute in human disease.
Original languageEnglish
Article numbereabb9036
Pages (from-to)eabb9036
JournalScience Advances
Volume6
Issue number33
DOIs
Publication statusPublished - 14 Aug 2020

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