Upregulated function of mitochondria-associated ER membranes in Alzheimer disease

Estela Area-Gomez, Maria Del Carmen Lara Castillo, Marc D. Tambini, Cristina Guardia-Laguarta, Ad J.C. De Groof, Moneek Madra, Junichi Ikenouchi, Masato Umeda, Thomas D. Bird, Stephen L. Sturley, Eric A. Schon

Research output: Contribution to journalArticlepeer-review

295 Citations (Scopus)

Abstract

Alzheimer disease (AD) is associated with aberrant processing of the amyloid precursor protein (APP) by γ-secretase, via an unknown mechanism. We recently showed that presenilin-1 and-2, the catalytic components of γ-secretase, and γ-secretase activity itself, are highly enriched in a subcompartment of the endoplasmic reticulum (ER) that is physically and biochemically connected to mitochondria, called mitochondria-associated ER membranes (MAMs). We now show that MAM function and ER-mitochondrial communication-as measured by cholesteryl ester and phospholipid synthesis, respectively-are increased significantly in presenilin-mutant cells and in fibroblasts from patients with both the familial and sporadic forms of AD. We also show that MAM is an intracellular detergent-resistant lipid raft (LR)-like domain, consistent with the known presence of presenilins and γ-secretase activity in rafts. These findings may help explain not only the aberrant APP processing but also a number of other biochemical features of AD, including altered lipid metabolism and calcium homeostasis. We propose that upregulated MAM function at the ER-mitochondrial interface, and increased cross-talk between these two organelles, may play a hitherto unrecognized role in the pathogenesis of AD.

Original languageEnglish
Pages (from-to)4106-4123
Number of pages18
JournalEMBO Journal
Volume31
Issue number21
DOIs
Publication statusPublished - Oct 31 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)
  • Molecular Biology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)

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