Cited by 59Alzheimer's disease research and treatmentsNeuroscience and Neuropharmacology ResearchAdvanced Fluorescence Microscopy Techniques

Super-resolution microscopy reveals γ-secretase at both sides of the neuronal synapse

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Schedin-Weiss, Sophia, Caesar, Ina, Winblad, Bengt, Blom, Hans, Tjernberg, Lars O.·2016·Acta Neuropathologica Communications

Abstract

The transmembrane protein assembly γ-secretase is a key protease in regulated intramembrane processing (RIP) of around 100 type-1 transmembrane proteins. Importantly, it has a pathological role in Alzheimer disease (AD) as it generates the neurotoxic amyloid β-peptide from the amyloid precursor protein (APP). Studies on γ-secretase location are therefore crucial both from a biological and a therapeutic perspective. Despite several years of efforts in many laboratories, it is not clear where in the neuron γ-secretase exerts it's activities. Technical challenges include the fact that the active enzyme contains four protein components and that most subcellular compartments cannot be spatially resolved by traditional light microscopy. Here, we have used a powerful combination of the two nanoscopy techniques STORM and STED microscopy to visualize the location of γ-secretase in neurons using an active-site specific probe, with a focus on the synapse. We show that γ-secretase is present in both the pre-and postsynaptic compartments. We further show that the enzyme is enriched very close to the synaptic cleft in the postsynaptic membrane, as well as to NMDA receptors, demonstrating that γ-secretase is present in the postsynaptic plasma membrane. Importantly, the expression of γ-secretase increased in the pre- and postsynaptic compartments with the size of the synapse, suggesting a correlation between γ-secretase activity and synapse maturation. Thus, our data shows the synaptic location with high precision in three dimensions and settles the long-lasting debate on the synaptic location of γ-secretase.

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    “In another study where CONV-R and GF mice were fed lard or fish oil diet it was also found that the microbiota downregulates cholesterol biosynthesis and increased hepatic levels of cholesterol specifically in mice fed lard [33].”

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Authors
Schedin-Weiss, S., Caesar, I., Winblad, B., Blom, H., & Tjernberg, L. O.
Affiliations
  • Karolinska Institutet (SE)
  • Science for Life Laboratory (SE)
Venue
Acta Neuropathologica Communications
Published
2016-03-31
Volume
4
Issue
1
Pages
29-29
ISSN
2051-5960 (ISSN-L)
OpenAlex
W2325208507
Cited by
58
References
24
Citations by year
2026: 2 · 2025: 3 · 2024: 6 · 2023: 6 · 2022: 5 · 2021: 10 · 2020: 7 · 2019: 6 · 2018: 5 · 2017: 7 · 2016: 1
FWCI
5.09
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Acta Neuropathologica Communications (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • The Hans-Gabriel and Alice Trolle-Wachtmeister Foundation for Medical Research
  • The Swedish Alzheimer foundation
  • Stiftelsen för gamla tjänarinnor
  • Gunnar and Bertil Stohnes foundation
  • The Swedish Research Council (VR-2013-6041)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biophysics › Advanced Fluorescence Microscopy Techniques
Keywords
gamma-secretase, synaptic localization, regulated intramembrane proteolysis, synapse maturation, postsynaptic membrane, synaptic cleft, NMDA receptor, amyloid-beta, Alzheimer's disease, amyloid precursor protein, super-resolution microscopy, storms, STED microscopy, active site probes
MeSH terms
Disks Large Homolog 4 Protein, Animals, Axons, Cells, Cultured, Dendrites, Embryo, Mammalian, Hippocampus, Image Processing, Computer-Assisted, Membrane Proteins, Mice, Inbred C57BL, Microtubule-Associated Proteins, Neurons, Synapses, Receptors, N-Methyl-D-Aspartate, Synaptophysin, tau Proteins, Microscopy, Confocal, Mice, Guanylate Kinases, Amyloid Precursor Protein Secretases, Neuroimaging

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