Cited by 400Alzheimer's disease research and treatmentsNeuroscience and Neuropharmacology ResearchNeuroinflammation and Neurodegeneration Mechanisms

η-Secretase processing of APP inhibits neuronal activity in the hippocampus

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Willem, Michael, Tahirovic, Sabina, Busche, Marc Aurel, Ovsepian, Saak V., Chafai, Magda, Kootar, Scherazad, Hornburg, Daniel, Evans, Lewis D. B. +19 more·2015·Nature

Abstract

Alzheimer disease (AD) is characterized by the accumulation of amyloid plaques, which are predominantly composed of amyloid-β peptide. Two principal physiological pathways either prevent or promote amyloid-β generation from its precursor, β-amyloid precursor protein (APP), in a competitive manner. Although APP processing has been studied in great detail, unknown proteolytic events seem to hinder stoichiometric analyses of APP metabolism in vivo. Here we describe a new physiological APP processing pathway, which generates proteolytic fragments capable of inhibiting neuronal activity within the hippocampus. We identify higher molecular mass carboxy-terminal fragments (CTFs) of APP, termed CTF-η, in addition to the long-known CTF-α and CTF-β fragments generated by the α- and β-secretases ADAM10 (a disintegrin and metalloproteinase 10) and BACE1 (β-site APP cleaving enzyme 1), respectively. CTF-η generation is mediated in part by membrane-bound matrix metalloproteinases such as MT5-MMP, referred to as η-secretase activity. η-Secretase cleavage occurs primarily at amino acids 504-505 of APP695, releasing a truncated ectodomain. After shedding of this ectodomain, CTF-η is further processed by ADAM10 and BACE1 to release long and short Aη peptides (termed Aη-α and Aη-β). CTFs produced by η-secretase are enriched in dystrophic neurites in an AD mouse model and in human AD brains. Genetic and pharmacological inhibition of BACE1 activity results in robust accumulation of CTF-η and Aη-α. In mice treated with a potent BACE1 inhibitor, hippocampal long-term potentiation was reduced. Notably, when recombinant or synthetic Aη-α was applied on hippocampal slices ex vivo, long-term potentiation was lowered. Furthermore, in vivo single-cell two-photon calcium imaging showed that hippocampal neuronal activity was attenuated by Aη-α. These findings not only demonstrate a major functionally relevant APP processing pathway, but may also indicate potential translational relevance for therapeutic strategies targeting APP processing.

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  • BACE1 inhibitors were seen to increase cleavage of APP by other secretases, thereby enhancing production of pathogenic APP metabolites.

    “Although inhibition of β-secretase activity is predicted to reduce Aβ production, BACE1 inhibitors were seen to increase cleavage of APP by other secretases, thereby enhancing the production of pathogenic APP metabolites [36].”

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  1. [34]Radde R A beta 42-driven cerebral amyloidosis in transgenic mice reveals early and robust pathology EMBO Rep 2006 7 940 946 16906128 PMC1559665
  2. [50]Jacobsen H Combined treatment with a BACE inhibitor and anti-Ab antibody gantenerumab enhances amyloid reduction in APPLondon mice J Neurosci 2014 in press PMC4145168 25164658

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Authors
Willem, M., Tahirovic, S., Busche, M. A., Ovsepian, S. V., Chafai, M., Kootar, S., Hornburg, D., Evans, L. D. B., Moore, S., Daria, A., Hampel, H., Müller, V., Giudici, C., Nuscher, B., Wenninger-Weinzierl, A., Kremmer, E., Heneka, M. T., Thal, D. R., Giedraitis, V., Lannfelt, L., Müller, U., Livesey, F. J., Meissner, F., Herms, J., Konnerth, A., Marie, H., & Haass, C.
Affiliations
  • Ludwig-Maximilians-Universität München (DE)
  • Munich Cluster for Systems Neurology (DE)
  • German Center for Neurodegenerative Diseases (DE)
  • Centre National de la Recherche Scientifique (FR)
  • Max Planck Institute of Biochemistry (DE)
  • Wellcome/MRC Cambridge Stem Cell Institute (GB)
  • University of Bonn (DE)
  • Universität Ulm (DE)
  • Uppsala University (SE)
  • Heidelberg University (DE)
Corresponding author
  • Willem, Michael
  • Haass, Christian
Venue
Nature
Published
2015-08-31
Volume
526
Issue
7573
Pages
443-447
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W1779570864
Cited by
398
References
71
Citations by year
2026: 17 · 2025: 27 · 2024: 20 · 2023: 23 · 2022: 23 · 2021: 36 · 2020: 46 · 2019: 54 · 2018: 39 · 2017: 58 · 2016: 46 · 2015: 9
FWCI
37.33
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • Site cant be reached (submittedVersion)
  • Open Repository and Bibliography (University of Luxembourg) (submittedVersion, other-oa)
  • HAL (submittedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • Lirias (submittedVersion)
  • mediaTUM – the media and publications repository of the Technical University Munich (Technical University Munich) (submittedVersion)
  • DZNE Pub (submittedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion)
  • PuSH - Publication Server of Helmholtz Zentrum München (submittedVersion)
Funders
  • Wellcome Trust (101052, 101052/Z/13/Z, 092096)
  • European Commission
  • Deutsche Forschungsgemeinschaft (MU 1457/9–1)
  • Agence Nationale de la Recherche (ANR-11-LABX-0028)
  • Eberhard Karls Universität Tübingen
  • Universitat de València
  • Centre National de la Recherche Scientifique (ANR-11-LABX-0028-01)
  • Deutsches Zentrum für Neurodegenerative Erkrankungen
  • Hans und Klementia Langmatz Stiftung
  • Medical Research Council (MR/L023784/2, MR/L023784/1)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
APP processing, amyloid precursor protein, ADAM10, BACE1, CTF, long-term potentiation, hippocampus, Alzheimer's disease, amyloid-beta, BACE1 inhibitors, dystrophic neurites, C-terminal fragment
MeSH terms
ADAM10 Protein, Alzheimer Disease, Animals, Disease Models, Animal, Female, Hippocampus, Humans, Male, Membrane Proteins, Molecular Weight, Neurons, Peptide Fragments, Protein Processing, Post-Translational, Aspartic Acid Endopeptidases, Neurites, Amyloid beta-Protein Precursor, Long-Term Potentiation, Calcium Signaling, Mice, ADAM Proteins, Matrix Metalloproteinases, Membrane-Associated, Amyloid Precursor Protein Secretases, Plaque, Amyloid, Single-Cell Analysis, Proteolysis, In Vitro Techniques

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