Lysosomal proteolysis and autophagy require presenilin 1 and are disrupted by Alzheimer-related PS1 mutations

Ju Hyun Lee, W. Haung Yu, Asok Kumar, Sooyeon Lee, Panaiyur S. Mohan, Corrinne M. Peterhoff, Devin M. Wolfe, Marta Martinez-Vicente, Ashish C. Massey, Guy Sovak, Yasuo Uchiyama, David Westaway, Ana Maria Cuervo, Ralph A. Nixon

Research output: Contribution to journalArticlepeer-review

748 Scopus citations

Abstract

Macroautophagy is a lysosomal degradative pathway essential for neuron survival. Here, we show that macroautophagy requires the Alzheimer's disease (AD)-related protein presenilin-1 (PS1). In PS1 null blastocysts, neurons from mice hypomorphic for PS1 or conditionally depleted of PS1, substrate proteolysis and autophagosome clearance during macroautophagy are prevented as a result of a selective impairment of autolysosome acidification and cathepsin activation. These deficits are caused by failed PS1-dependent targeting of the v-ATPase V0a1 subunit to lysosomes. N-glycosylation of the V0a1 subunit, essential for its efficient ER-to-lysosome delivery, requires the selective binding of PS1 holoprotein to the unglycosylated subunit and the Sec61alpha/oligosaccharyltransferase complex. PS1 mutations causing early-onset AD produce a similar lysosomal/autophagy phenotype in fibroblasts from AD patients. PS1 is therefore essential for v-ATPase targeting to lysosomes, lysosome acidification, and proteolysis during autophagy. Defective lysosomal proteolysis represents a basis for pathogenic protein accumulations and neuronal cell death in AD and suggests previously unidentified therapeutic targets.

Original languageEnglish (US)
Pages (from-to)1146-1158
Number of pages13
JournalCell
Volume141
Issue number7
DOIs
StatePublished - Jun 2010

Keywords

  • Cellbio
  • Humdisease

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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