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Pigoni, M.* ; Wanngren, J.* ; Kuhn, P.-H.* ; Munro, K.M.* ; Gunnersen, J.M.* ; Takeshima, H.* ; Feederle, R. ; Voytyuk, I.* ; de Strooper, B.* ; Levasseur, M.D.* ; Hrupka, B.J.* ; Mueller, S.A.* ; Lichtenthaler, S.F.*

Seizure protein 6 and its homolog seizure 6-like protein are physiological substrates of BACE1 in neurons.

Mol. Neurodegener. 11:67 (2016)
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Open Access Gold
Creative Commons Lizenzvertrag
Background: The protease BACE1 (beta-site APP cleaving enzyme) is a major drug target in Alzheimer's disease. However, BACE1 therapeutic inhibition may cause unwanted adverse effects due to its additional functions in the nervous system, such as in myelination and neuronal connectivity. Additionally, recent proteomic studies investigating BACE1 inhibition in cell lines and cultured murine neurons identified a wider range of neuronal membrane proteins as potential BACE1 substrates, including seizure protein 6 (SEZ6) and its homolog SEZ6L. Methods and results: We generated antibodies against SEZ6 and SEZ6L and validated these proteins as BACE1 substrates in vitro and in vivo. Levels of the soluble, BACE1-cleaved ectodomain of both proteins (sSEZ6, sSEZ6L) were strongly reduced upon BACE1 inhibition in primary neurons and also in vivo in brains of BACE1-deficient mice. BACE1 inhibition increased neuronal surface levels of SEZ6 and SEZ6L as shown by cell surface biotinylation, demonstrating that BACE1 controls surface expression of both proteins. Moreover, mass spectrometric analysis revealed that the BACE1 cleavage site in SEZ6 is located in close proximity to the membrane, similar to the corresponding cleavage site in SEZ6L. Finally, an improved method was developed for the proteomic analysis of murine cerebrospinal fluid (CSF) and was applied to CSF from BACE-deficient mice. Hereby, SEZ6 and SEZ6L were validated as BACE1 substrates in vivo by strongly reduced levels in the CSF of BACE1-deficient mice. Conclusions: This study demonstrates that SEZ6 and SEZ6L are physiological BACE1 substrates in the murine brain and suggests that sSEZ6 and sSEZ6L levels in CSF are suitable markers to monitor BACE1 inhibition in mice.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter Alzheimer's Disease ; Bace1 ; Bace2 ; Secretase ; Neuroproteomics ; Biomarker ; Sez6 ; Sez6l; Amyloid Precursor Protein; Regulated Intramembrane Proteolysis; Beta-secretase Bace1; Alzheimers-disease; Cell-adhesion; Proteomic Analysis; Mass-spectrometry; Aspartyl Protease; Memory Deficits; In-vivo
Sprache deutsch
Veröffentlichungsjahr 2016
HGF-Berichtsjahr 2016
e-ISSN 1750-1326
Quellenangaben Band: 11, Heft: , Seiten: , Artikelnummer: 67 Supplement: ,
Verlag BioMed Central
Verlagsort London
Begutachtungsstatus Peer reviewed
Institut(e) Institute of Diabetes and Obesity (IDO)
CF Monoclonal Antibodies (CF-MAB)
POF Topic(s) 90000 - German Center for Diabetes Research
30201 - Metabolic Health
Forschungsfeld(er) Helmholtz Diabetes Center
PSP-Element(e) G-502291-001
G-502210-001
Scopus ID 84992117658
Erfassungsdatum 2016-10-31