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Capitini C, Bigi A, Parenti N, Emanuele M, Bianchi N, Cascella R, Cecchi C, Maggi L, Annunziato F, Pavone FS, Calamai M. APP and Bace1: Differential effect of cholesterol enrichment on processing and plasma membrane mobility. iScience 2023; 26:106611. [PMID: 37128606 PMCID: PMC10148118 DOI: 10.1016/j.isci.2023.106611] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 02/08/2023] [Accepted: 03/31/2023] [Indexed: 05/03/2023] Open
Abstract
High cholesterol levels are a risk factor for the development of Alzheimer's disease. Experiments investigating the influence of cholesterol on the proteolytic processing of the amyloid precursor protein (APP) by the β-secretase Bace1 and on their proximity in cells have led to conflicting results. By using a fluorescence bioassay coupled with flow cytometry we found a direct correlation between the increase in membrane cholesterol amount and the degree of APP shedding in living human neuroblastoma cells. Analogue results were obtained for cells overexpressing an APP mutant that cannot be processed by α-secretase, highlighting the major influence of cholesterol enrichment on the cleavage of APP carried out by Bace1. By contrast, the cholesterol content was not correlated with changes in membrane dynamics of APP and Bace1 analyzed with single molecule tracking, indicating that the effect of cholesterol enrichment on APP processing by Bace1 is uncoupled from changes in their lateral diffusion.
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Affiliation(s)
- Claudia Capitini
- Dipartimento di Fisica e Astronomia, Università degli Studi di Firenze, 50019 Florence, Italy
- European Laboratory for Non-linear Spectroscopy (LENS), University of Florence, 50019Florence, Italy
| | - Alessandra Bigi
- Department of Experimental and Clinical Biomedical Sciences, University of Florence, 50134 Florence, Italy
| | - Niccolò Parenti
- European Laboratory for Non-linear Spectroscopy (LENS), University of Florence, 50019Florence, Italy
| | - Marco Emanuele
- European Laboratory for Non-linear Spectroscopy (LENS), University of Florence, 50019Florence, Italy
| | - Niccolò Bianchi
- European Laboratory for Non-linear Spectroscopy (LENS), University of Florence, 50019Florence, Italy
| | - Roberta Cascella
- Department of Experimental and Clinical Biomedical Sciences, University of Florence, 50134 Florence, Italy
| | - Cristina Cecchi
- Department of Experimental and Clinical Biomedical Sciences, University of Florence, 50134 Florence, Italy
| | - Laura Maggi
- Department of Experimental and Clinical Medicine, University of Florence 50134 Florence, Italy
| | - Francesco Annunziato
- Department of Experimental and Clinical Medicine, University of Florence 50134 Florence, Italy
| | - Francesco Saverio Pavone
- Dipartimento di Fisica e Astronomia, Università degli Studi di Firenze, 50019 Florence, Italy
- European Laboratory for Non-linear Spectroscopy (LENS), University of Florence, 50019Florence, Italy
- National Institute of Optics, National Research Council of Italy (CNR), Largo Fermi 6, 50125Florence, Italy
| | - Martino Calamai
- European Laboratory for Non-linear Spectroscopy (LENS), University of Florence, 50019Florence, Italy
- National Institute of Optics, National Research Council of Italy (CNR), Largo Fermi 6, 50125Florence, Italy
- Corresponding author
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Hershkovits AS, Gelley S, Hanna R, Kleifeld O, Shulman A, Fishman A. Shifting the balance: soluble ADAM10 as a potential treatment for Alzheimer's disease. Front Aging Neurosci 2023; 15:1171123. [PMID: 37266401 PMCID: PMC10229884 DOI: 10.3389/fnagi.2023.1171123] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Accepted: 04/20/2023] [Indexed: 06/03/2023] Open
Abstract
Introduction Accumulation of amyloid β in the brain is regarded as a key initiator of Alzheimer's disease pathology. Processing of the amyloid precursor protein (APP) in the amyloidogenic pathway yields neurotoxic amyloid β species. In the non-amyloidogenic pathway, APP is processed by membrane-bound ADAM10, the main α-secretase in the nervous system. Here we present a new enzymatic approach for the potential treatment of Alzheimer's disease using a soluble form of ADAM10. Methods The ability of the soluble ADAM10 to shed overexpressed and endogenous APP was determined with an ADAM10 knockout cell line and a human neuroblastoma cell line, respectively. We further examined its effect on amyloid β aggregation by thioflavin T fluorescence, HPLC, and confocal microscopy. Using N-terminal and C-terminal enrichment proteomic approaches, we identified soluble ADAM10 substrates. Finally, a truncated soluble ADAM10, based on the catalytic domain, was expressed in Escherichia coli for the first time, and its activity was evaluated. Results The soluble enzyme hydrolyzes APP and releases the neuroprotective soluble APPα when exogenously added to cell cultures. The soluble ADAM10 inhibits the formation and aggregation of characteristic amyloid β extracellular neuronal aggregates. The proteomic investigation identified new and verified known substrates, such as VGF and N-cadherin, respectively. The truncated variant also exhibited α-secretase capacity as shown with a specific ADAM10 fluorescent substrate in addition to shedding overexpressed and endogenous APP. Discussion Our in vitro study demonstrates that exogenous treatment with a soluble variant of ADAM10 would shift the balance toward the non-amyloidogenic pathway, thus utilizing its natural neuroprotective effect and inhibiting the main neurotoxic amyloid β species. The potential of such a treatment for Alzheimer's disease needs to be further evaluated in vivo.
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Affiliation(s)
- Ayelet Sarah Hershkovits
- Department of Biotechnology and Food Engineering Technion-Israel Institute of Technology, Haifa, Israel
- The Interdisciplinary Program for Biotechnology, Technion-Israel Institute of Technology, Haifa, Israel
| | - Sivan Gelley
- Department of Biotechnology and Food Engineering Technion-Israel Institute of Technology, Haifa, Israel
| | - Rawad Hanna
- Department of Biology Technion-Israel Institute of Technology, Haifa, Israel
| | - Oded Kleifeld
- Department of Biology Technion-Israel Institute of Technology, Haifa, Israel
| | | | - Ayelet Fishman
- Department of Biotechnology and Food Engineering Technion-Israel Institute of Technology, Haifa, Israel
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Suraritdechachai S, Lakkanasirorat B, Uttamapinant C. Molecular probes for cellular imaging of post-translational proteoforms. RSC Chem Biol 2022; 3:201-219. [PMID: 35360891 PMCID: PMC8826509 DOI: 10.1039/d1cb00190f] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Accepted: 01/04/2022] [Indexed: 12/29/2022] Open
Abstract
Specific post-translational modification (PTM) states of a protein affect its property and function; understanding their dynamics in cells would provide deep insight into diverse signaling pathways and biological processes. However, it is not trivial to visualize post-translational modifications in a protein- and site-specific manner, especially in a living-cell context. Herein, we review recent advances in the development of molecular imaging tools to detect diverse classes of post-translational proteoforms in individual cells, and their applications in studying precise roles of PTMs in regulating the function of cellular proteins.
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Affiliation(s)
- Surased Suraritdechachai
- School of Biomolecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC) Rayong Thailand
| | - Benya Lakkanasirorat
- School of Biomolecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC) Rayong Thailand
| | - Chayasith Uttamapinant
- School of Biomolecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC) Rayong Thailand
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Dallari C, Capitini C, Calamai M, Trabocchi A, Pavone FS, Credi C. Gold Nanostars Bioconjugation for Selective Targeting and SERS Detection of Biofluids. NANOMATERIALS 2021; 11:nano11030665. [PMID: 33800443 PMCID: PMC8000610 DOI: 10.3390/nano11030665] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 03/04/2021] [Accepted: 03/05/2021] [Indexed: 12/25/2022]
Abstract
Gold nanoparticles (AuNPs) show physicochemical and optical functionalities that are of great interest for spectroscopy-based detection techniques, and especially for surface enhanced Raman spectroscopy (SERS), which is capable of providing detailed information on the molecular content of analysed samples. Moreover, the introduction of different moieties combines the interesting plasmonic properties of the AuNPs with the specific and selective recognition capabilities of the antibodies (Ab) towards antigens. The conjugation of biomolecules to gold nanoparticles (AuNPs) has received considerable attention for analysis of liquid samples and in particular biological fluids (biofluids) in clinical diagnostic and therapeutic field. To date, gold nanostars (AuNSts) are gaining more and more attention as optimal enhancers for SERS signals due to the presence of sharp branches protruding from the core, providing a huge number of “hot spots”. To this end, we focused our attention on the design, optimization, and deep characterization of a bottom up-process for (i) AuNPs increasing stabilization in high ionic strength buffer, (ii) covalent conjugation with antibodies, while (iii) retaining the biofunctionality to specific tag analyte within the biofluids. In this work, a SERS-based substrate was developed for the recognition of a short fragment (HA) of the hemagglutinin protein, which is the major viral antigen inducing a neutralizing antibody response. The activity and specific targeting with high selectivity of the Ab-AuNPs was successfully tested in transfected neuroblastoma cells cultures. Then, SERS capabilities were assessed measuring Raman spectra of HA solution, thus opening interesting perspective for the development of novel versatile highly sensitive biofluids sensors.
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Affiliation(s)
- Caterina Dallari
- European Laboratory for non-linear Spectroscopy (LENS), University of Florence, 50019 Sesto Fiorentino, Florence, Italy; (C.C.); (M.C.); (F.S.P.)
- Correspondence: (C.D.); (C.C.)
| | - Claudia Capitini
- European Laboratory for non-linear Spectroscopy (LENS), University of Florence, 50019 Sesto Fiorentino, Florence, Italy; (C.C.); (M.C.); (F.S.P.)
- Department of Physics, University of Florence, 50019 Sesto Fiorentino, Florence, Italy
| | - Martino Calamai
- European Laboratory for non-linear Spectroscopy (LENS), University of Florence, 50019 Sesto Fiorentino, Florence, Italy; (C.C.); (M.C.); (F.S.P.)
- National Institute of Optics-National Research Council (CNR-INO), 50019 Sesto Fiorentino, Florence, Italy
| | - Andrea Trabocchi
- Department of Chemistry “Ugo Schiff”, University of Florence, 50019 Sesto Fiorentino, Florence, Italy;
| | - Francesco Saverio Pavone
- European Laboratory for non-linear Spectroscopy (LENS), University of Florence, 50019 Sesto Fiorentino, Florence, Italy; (C.C.); (M.C.); (F.S.P.)
- Department of Physics, University of Florence, 50019 Sesto Fiorentino, Florence, Italy
- National Institute of Optics-National Research Council (CNR-INO), 50019 Sesto Fiorentino, Florence, Italy
| | - Caterina Credi
- European Laboratory for non-linear Spectroscopy (LENS), University of Florence, 50019 Sesto Fiorentino, Florence, Italy; (C.C.); (M.C.); (F.S.P.)
- National Institute of Optics-National Research Council (CNR-INO), 50019 Sesto Fiorentino, Florence, Italy
- Correspondence: (C.D.); (C.C.)
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Bera S, Camblor‐Perujo S, Calleja Barca E, Negrete‐Hurtado A, Racho J, De Bruyckere E, Wittich C, Ellrich N, Martins S, Adjaye J, Kononenko NL. AP-2 reduces amyloidogenesis by promoting BACE1 trafficking and degradation in neurons. EMBO Rep 2020; 21:e47954. [PMID: 32323475 PMCID: PMC7271323 DOI: 10.15252/embr.201947954] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 03/11/2020] [Accepted: 03/13/2020] [Indexed: 12/13/2022] Open
Abstract
Cleavage of amyloid precursor protein (APP) by BACE-1 (β-site APP cleaving enzyme 1) is the rate-limiting step in amyloid-β (Aβ) production and a neuropathological hallmark of Alzheimer's disease (AD). Despite decades of research, mechanisms of amyloidogenic APP processing remain highly controversial. Here, we show that in neurons, APP processing and Aβ production are controlled by the protein complex-2 (AP-2), an endocytic adaptor known to be required for APP endocytosis. Now, we find that AP-2 prevents amyloidogenesis by additionally functioning downstream of BACE1 endocytosis, regulating BACE1 endosomal trafficking and its delivery to lysosomes. AP-2 is decreased in iPSC-derived neurons from patients with late-onset AD, while conditional AP-2 knockout (KO) mice exhibit increased Aβ production, resulting from accumulation of BACE1 within late endosomes and autophagosomes. Deletion of BACE1 decreases amyloidogenesis and mitigates synapse loss in neurons lacking AP-2. Taken together, these data suggest a mechanism for BACE1 intracellular trafficking and degradation via an endocytosis-independent function of AP-2 and reveal a novel role for endocytic proteins in AD.
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Affiliation(s)
- Sujoy Bera
- CECAD Research CenterUniversity of CologneCologneGermany
- Present address:
Centre for Neuroscience and Regenerative MedicineFaculty of ScienceUniversity of Technology SydneySydneyNSWAustralia
| | | | | | | | - Julia Racho
- CECAD Research CenterUniversity of CologneCologneGermany
| | | | | | - Nina Ellrich
- CECAD Research CenterUniversity of CologneCologneGermany
| | - Soraia Martins
- Institute for Stem Cell Research and Regenerative MedicineMedical FacultyHeinrich Heine UniversityDüsseldorfGermany
| | - James Adjaye
- Institute for Stem Cell Research and Regenerative MedicineMedical FacultyHeinrich Heine UniversityDüsseldorfGermany
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Nguyen KV, Naviaux RK, Nyhan WL. Lesch-Nyhan disease: I. Construction of expression vectors for hypoxanthine-guanine phosphoribosyltransferase (HGprt) enzyme and amyloid precursor protein (APP). NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2020; 39:905-922. [PMID: 32312153 DOI: 10.1080/15257770.2020.1714653] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Lesch-Nyhan disease (LND) is a rare X-linked inherited neurogenetic disorder of purine metabolism in which the enzyme, hypoxanthine-guanine phosphoribosyltransferase (HGprt) is defective. Despite having been characterized over 50 years ago, it remains unclear precisely how deficits in HGprt enzyme activity can lead to the neurological syndrome, especially the self-injury of LND. Several studies have proposed different hypotheses regarding the etiology of this disease, and several treatments have been tried in patients. However, up to now, there is no satisfactory explanation of the disease and for many LND patients, efficacious treatment for persistent self-injurious behavior remains unreachable. A role for epistasis between mutated hypoxanthine phosphoribosyltransferase 1 (HPRT1) and amyloid precursor protein (APP) genes has been recently suggested. This finding may provide new directions not only for investigating the role of APP in neuropathology associated with HGprt-deficiency in LND but also for the research in neurodevelopmental and neurodegenerative disorders in which the APP gene is involved in the pathogenesis of diseases and may pave the way for new strategies applicable to rational antisense drugs design. It is therefore necessary to study the HGprt enzyme and APP using expression vectors for exploring their impacts on LND as well as other human diseases, especially the ones related to APP such as Alzheimer's disease in which the physiologic function and the structure of the entire APP remain largely unclear until now. For such a purpose, we report here the construction of expression vectors as the first step (Part I) of our investigation.
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Affiliation(s)
- Khue Vu Nguyen
- Department of Medicine, Biochemical Genetics and Metabolism, The Mitochondrial and Metabolic Disease Center, School of Medicine, University of California, San Diego, San Diego, California, USA.,Department of Pediatrics, School of Medicine, University of California, San Diego, California, USA
| | - Robert K Naviaux
- Department of Medicine, Biochemical Genetics and Metabolism, The Mitochondrial and Metabolic Disease Center, School of Medicine, University of California, San Diego, San Diego, California, USA.,Department of Pediatrics, School of Medicine, University of California, San Diego, California, USA.,Department of Pathology, School of Medicine, University of California, San Diego, California, USA
| | - William L Nyhan
- Department of Pediatrics, School of Medicine, University of California, San Diego, California, USA
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Calamai M, Pavone FS. Quantifying the Proteolytic Cleavage of Plasma Membrane Proteins in Living Cells. ACTA ACUST UNITED AC 2018; 81:e58. [PMID: 30085418 DOI: 10.1002/cpcb.58] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The standard approach to study the activity of proteases consists of lysing cells and measuring the changes in the fluorescence properties of a synthetic substrate after cleavage in vitro. Here, a general protocol that uses a bi-fluorescent chimeric construct of a known substrate protein that follows the proteolytic processing in living cells is described. This approach is useful, in particular, to search for pharmacological conditions altering the cleavage rate of a certain protease, or to investigate the biological factors influencing a certain proteolytic mechanism. Three different methods (microscopy, flow cytometry, and spectroscopy) to detect fluorescence changes due to alteration in the processing are described. This approach was originally developed for studying conditions affecting the proteolytic activity of the β-secretase Bace1 on the amyloid precursor protein APP, but can in principle be applied to investigate any membrane protein undergoing ectodomain shedding by proteolytic cleavage. © 2018 by John Wiley & Sons, Inc.
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Affiliation(s)
- Martino Calamai
- National Institute of Optics, National Research Council of Italy (CNR), Florence, Italy.,LENS - European Laboratory for Non-linear Spectroscopy, Florence, Italy
| | - Francesco Saverio Pavone
- National Institute of Optics, National Research Council of Italy (CNR), Florence, Italy.,LENS - European Laboratory for Non-linear Spectroscopy, Florence, Italy
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