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Obici L, Mussinelli R. Current and Emerging Therapies for Hereditary Transthyretin Amyloidosis: Strides Towards a Brighter Future. Neurotherapeutics 2021; 18:2286-2302. [PMID: 34850359 PMCID: PMC8804119 DOI: 10.1007/s13311-021-01154-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/29/2021] [Indexed: 12/19/2022] Open
Abstract
The past few years have witnessed an unprecedented acceleration in the clinical development of novel therapeutic options for hereditary transthyretin amyloidosis. Recently approved agents and drugs currently under investigation not only represent a major breakthrough in this field but also provide validation of the therapeutic potential of innovative approaches, like RNA interference and CRISPR-Cas9-mediated gene editing, in rare inherited disorders. In this review, we describe the evolving therapeutic landscape for hereditary transthyretin amyloidosis and discuss how this highly disabling and fatal condition is turning into a treatable disease. We also provide an overview of the molecular mechanisms involved in transthyretin (TTR) amyloid formation and regression, to highlight how a deeper understanding of these processes has contributed to the identification of novel treatment targets. Finally, we focus on major areas of uncertainty and unmet needs that deserve further efforts to improve long-term patients' outcomes and allow for a brighter future.
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Affiliation(s)
- Laura Obici
- Amyloidosis Research and Treatment Centre, IRCCS Fondazione Policlinico San Matteo, Viale Golgi, 19, 27100, Pavia, Italy.
| | - Roberta Mussinelli
- Amyloidosis Research and Treatment Centre, IRCCS Fondazione Policlinico San Matteo, Viale Golgi, 19, 27100, Pavia, Italy
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2
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Rostagno A, Calero M, Holton JL, Revesz T, Lashley T, Ghiso J. Association of clusterin with the BRI2-derived amyloid molecules ABri and ADan. Neurobiol Dis 2021; 158:105452. [PMID: 34298087 PMCID: PMC8440498 DOI: 10.1016/j.nbd.2021.105452] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Revised: 06/30/2021] [Accepted: 07/18/2021] [Indexed: 10/20/2022] Open
Abstract
Familial British and Danish dementias (FBD and FDD) share striking neuropathological similarities with Alzheimer's disease (AD), including intraneuronal neurofibrillary tangles as well as parenchymal and vascular amyloid deposits. Multiple amyloid associated proteins with still controversial role in amyloidogenesis colocalize with the structurally different amyloid peptides ABri in FBD, ADan in FDD, and Aβ in AD. Genetic variants and plasma levels of one of these associated proteins, clusterin, have been identified as risk factors for AD. Clusterin is known to bind soluble Aβ in biological fluids, facilitate its brain clearance, and prevent its aggregation. The current work identifies clusterin as the major ABri- and ADan-binding protein and provides insight into the biochemical mechanisms leading to the association of clusterin with ABri and ADan deposits. Mirroring findings in AD, the studies corroborate clusterin co-localization with cerebral parenchymal and vascular amyloid deposits in both disorders. Ligand affinity chromatography with downstream Western blot and amino acid sequence analyses unequivocally identified clusterin as the major ABri- and ADan-binding plasma protein. ELISA highlighted a specific saturable binding of clusterin to ABri and ADan with low nanomolar Kd values within the same range as those previously demonstrated for the clusterin-Aβ interaction. Consistent with its chaperone activity, thioflavin T binding assays clearly showed a modulatory effect of clusterin on ABri and ADan aggregation/fibrillization properties. Our findings, together with the known multifunctional activity of clusterin and its modulatory activity on the complex cellular pathways leading to oxidative stress, mitochondrial dysfunction, and the induction of cell death mechanisms - all known pathogenic features of these protein folding disorders - suggests the likelihood of a more complex role and a translational potential for the apolipoprotein in the amelioration/prevention of these pathogenic mechanisms.
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Affiliation(s)
- Agueda Rostagno
- Department of Pathology, New York University School of Medicine, New York, NY 10016, USA
| | - Miguel Calero
- Instituto de Salud Carlos III, 28029 Madrid, Spain; Network Center for Biomedical Research in Neurodegenerative Diseases (CIBERNED), 28031 Madrid, Spain; Alzheimer's Center Reina Sofia Foundation - CIEN Foundation, 28031 Madrid, Spain
| | - Janice L Holton
- The Queen Square Brain Bank for Neurological Disorders, Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London WC1N 3BG, UK
| | - Tamas Revesz
- The Queen Square Brain Bank for Neurological Disorders, Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London WC1N 3BG, UK; Department of Neurodegenerative Disease, UCL Queen Square Institute of Neurology, London WC1N 3BG, UK
| | - Tammaryn Lashley
- The Queen Square Brain Bank for Neurological Disorders, Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London WC1N 3BG, UK; Department of Neurodegenerative Disease, UCL Queen Square Institute of Neurology, London WC1N 3BG, UK
| | - Jorge Ghiso
- Department of Pathology, New York University School of Medicine, New York, NY 10016, USA; Department of Psychiatry, New York University School of Medicine, New York, NY 10016, USA.
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3
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Konstantoulea K, Louros N, Rousseau F, Schymkowitz J. Heterotypic interactions in amyloid function and disease. FEBS J 2021; 289:2025-2046. [PMID: 33460517 DOI: 10.1111/febs.15719] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 01/07/2021] [Accepted: 01/15/2021] [Indexed: 11/27/2022]
Abstract
Amyloid aggregation results from the self-assembly of identical aggregation-prone sequences into cross-beta-sheet structures. The process is best known for its association with a wide range of human pathologies but also as a functional mechanism in all kingdoms of life. Less well elucidated is the role of heterotypic interactions between amyloids and other proteins and macromolecules and how this contributes to disease. We here review current data with a focus on neurodegenerative amyloid-associated diseases. Evidence indicates that heterotypic interactions occur in a wide range of amyloid processes and that these interactions modify fundamental aspects of amyloid aggregation including seeding, aggregation rates and toxicity. More work is required to understand the mechanistic origin of these interactions, but current understanding suggests that both supersaturation and sequence-specific binding can contribute to heterotypic amyloid interactions. Further unravelling these mechanisms may help to answer outstanding questions in the field including the selective vulnerability of cells types and tissues and the stereotypical spreading patterns of amyloids in disease.
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Affiliation(s)
- Katerina Konstantoulea
- VIB Center for Brain and Disease Research, Leuven, Belgium.,Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Nikolaos Louros
- VIB Center for Brain and Disease Research, Leuven, Belgium.,Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Frederic Rousseau
- VIB Center for Brain and Disease Research, Leuven, Belgium.,Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Joost Schymkowitz
- VIB Center for Brain and Disease Research, Leuven, Belgium.,Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
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4
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Bezerra F, Saraiva MJ, Almeida MR. Modulation of the Mechanisms Driving Transthyretin Amyloidosis. Front Mol Neurosci 2020; 13:592644. [PMID: 33362465 PMCID: PMC7759661 DOI: 10.3389/fnmol.2020.592644] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Accepted: 11/18/2020] [Indexed: 12/19/2022] Open
Abstract
Transthyretin (TTR) amyloidoses are systemic diseases associated with TTR aggregation and extracellular deposition in tissues as amyloid. The most frequent and severe forms of the disease are hereditary and associated with amino acid substitutions in the protein due to single point mutations in the TTR gene (ATTRv amyloidosis). However, the wild type TTR (TTR wt) has an intrinsic amyloidogenic potential that, in particular altered physiologic conditions and aging, leads to TTR aggregation in people over 80 years old being responsible for the non-hereditary ATTRwt amyloidosis. In normal physiologic conditions TTR wt occurs as a tetramer of identical subunits forming a central hydrophobic channel where small molecules can bind as is the case of the natural ligand thyroxine (T4). However, the TTR amyloidogenic variants present decreased stability, and in particular conditions, dissociate into partially misfolded monomers that aggregate and polymerize as amyloid fibrils. Therefore, therapeutic strategies for these amyloidoses may target different steps in the disease process such as decrease of variant TTR (TTRv) in plasma, stabilization of TTR, inhibition of TTR aggregation and polymerization or disruption of the preformed fibrils. While strategies aiming decrease of the mutated TTR involve mainly genetic approaches, either by liver transplant or the more recent technologies using specific oligonucleotides or silencing RNA, the other steps of the amyloidogenic cascade might be impaired by pharmacologic compounds, namely, TTR stabilizers, inhibitors of aggregation and amyloid disruptors. Modulation of different steps involved in the mechanism of ATTR amyloidosis and compounds proposed as pharmacologic agents to treat TTR amyloidosis will be reviewed and discussed.
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Affiliation(s)
- Filipa Bezerra
- Molecular Neurobiology Group, IBMC-Instituto de Biologia Molecular e Celular, i3S-Instituto de Investigação e Inovação em Saúde, Porto, Portugal.,Department of Molecular Biology, ICBAS-Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Porto, Portugal
| | - Maria João Saraiva
- Molecular Neurobiology Group, IBMC-Instituto de Biologia Molecular e Celular, i3S-Instituto de Investigação e Inovação em Saúde, Porto, Portugal.,Department of Molecular Biology, ICBAS-Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Porto, Portugal
| | - Maria Rosário Almeida
- Molecular Neurobiology Group, IBMC-Instituto de Biologia Molecular e Celular, i3S-Instituto de Investigação e Inovação em Saúde, Porto, Portugal.,Department of Molecular Biology, ICBAS-Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Porto, Portugal
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5
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Chaplot K, Jarvela TS, Lindberg I. Secreted Chaperones in Neurodegeneration. Front Aging Neurosci 2020; 12:268. [PMID: 33192447 PMCID: PMC7481362 DOI: 10.3389/fnagi.2020.00268] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Accepted: 08/03/2020] [Indexed: 12/11/2022] Open
Abstract
Protein homeostasis, or proteostasis, is a combination of cellular processes that govern protein quality control, namely, protein translation, folding, processing, and degradation. Disruptions in these processes can lead to protein misfolding and aggregation. Proteostatic disruption can lead to cellular changes such as endoplasmic reticulum or oxidative stress; organelle dysfunction; and, if continued, to cell death. A majority of neurodegenerative diseases involve the pathologic aggregation of proteins that subverts normal neuronal function. While prior reviews of neuronal proteostasis in neurodegenerative processes have focused on cytoplasmic chaperones, there is increasing evidence that chaperones secreted both by neurons and other brain cells in the extracellular – including transsynaptic – space play important roles in neuronal proteostasis. In this review, we will introduce various secreted chaperones involved in neurodegeneration. We begin with clusterin and discuss its identification in various protein aggregates, and the use of increased cerebrospinal fluid (CSF) clusterin as a potential biomarker and as a potential therapeutic. Our next secreted chaperone is progranulin; polymorphisms in this gene represent a known genetic risk factor for frontotemporal lobar degeneration, and progranulin overexpression has been found to be effective in reducing Alzheimer’s- and Parkinson’s-like neurodegenerative phenotypes in mouse models. We move on to BRICHOS domain-containing proteins, a family of proteins containing highly potent anti-amyloidogenic activity; we summarize studies describing the biochemical mechanisms by which recombinant BRICHOS protein might serve as a therapeutic agent. The next section of the review is devoted to the secreted chaperones 7B2 and proSAAS, small neuronal proteins which are packaged together with neuropeptides and released during synaptic activity. Since proteins can be secreted by both classical secretory and non-classical mechanisms, we also review the small heat shock proteins (sHsps) that can be secreted from the cytoplasm to the extracellular environment and provide evidence for their involvement in extracellular proteostasis and neuroprotection. Our goal in this review focusing on extracellular chaperones in neurodegenerative disease is to summarize the most recent literature relating to neurodegeneration for each secreted chaperone; to identify any common mechanisms; and to point out areas of similarity as well as differences between the secreted chaperones identified to date.
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Affiliation(s)
- Kriti Chaplot
- Department of Anatomy and Neurobiology, University of Maryland School of Medicine, University of Maryland, Baltimore, Baltimore, MD, United States
| | - Timothy S Jarvela
- Department of Anatomy and Neurobiology, University of Maryland School of Medicine, University of Maryland, Baltimore, Baltimore, MD, United States
| | - Iris Lindberg
- Department of Anatomy and Neurobiology, University of Maryland School of Medicine, University of Maryland, Baltimore, Baltimore, MD, United States
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6
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Ghaffari Sharaf M, Damji KF, Unsworth LD. Recent advances in risk factors associated with ocular exfoliation syndrome. Acta Ophthalmol 2020; 98:113-120. [PMID: 31736276 DOI: 10.1111/aos.14298] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Accepted: 10/13/2019] [Indexed: 12/12/2022]
Abstract
Exfoliation syndrome is generally considered a progressive age-related systemic disorder of the extracellular matrix, which is clinically characterized through the observation of flaky white aggregates on ocular tissues. Exfoliation syndrome is directly linked to exfoliative glaucoma in elderly patients, where it is known as the most common identifiable cause of open-angle glaucoma. Despite the identification of various risk factors associated with exfoliation syndrome, the exact pathogenesis of this syndrome has not been fully elucidated. There is a growing number of genome-wide association studies in different populations around the world to identify genetic factors underlying exfoliation syndrome. Besides variants in LOXL1 and CACNA1A genes, new loci have been recently identified which are believed to be associated with exfoliation syndrome. Among different genetic factors, functional variants might help to better understand mechanisms underlying this systemic disorder. Besides genetic factors, epigenetic regulation of different gene expression patterns has been thought to play a role in its pathogenesis. Other factors have been also considered to be involved in the development of exfoliation syndrome at cellular organelles level where mitochondrial impairment and autophagy dysfunction have been suggested in relation to exfoliation syndrome. This review addresses the most recent findings on genetic factors as well as cellular and molecular mechanisms involved in both the development and progression of exfoliation syndrome.
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Affiliation(s)
- Mehdi Ghaffari Sharaf
- Department of Chemical and Materials Engineering University of Alberta Edmonton Alberta Canada
| | - Karim F. Damji
- Department of Ophthalmology and Visual Sciences University of Alberta Edmonton Alberta Canada
| | - Larry D. Unsworth
- Department of Chemical and Materials Engineering University of Alberta Edmonton Alberta Canada
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Montoliu-Gaya L, Mulder SD, Veerhuis R, Villegas S. Effects of an Aβ-antibody fragment on Aβ aggregation and astrocytic uptake are modulated by apolipoprotein E and J mimetic peptides. PLoS One 2017; 12:e0188191. [PMID: 29155887 PMCID: PMC5695774 DOI: 10.1371/journal.pone.0188191] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2017] [Accepted: 11/02/2017] [Indexed: 01/23/2023] Open
Abstract
Aβ-Immunotherapy has long been studied in the treatment of Alzheimer’s disease (AD), but not how other molecules involved in the disease can affect antibody performance. We previously designed an antibody fragment, scFv-h3D6, and showed that it precludes Aβ-induced cytotoxicity by withdrawing Aβ oligomers from the amyloid pathway towards a non-toxic, worm-like pathway. ScFv-h3D6 was effective at the behavioral, cellular, and molecular levels in the 3xTg-AD mouse model. Because scFv-h3D6 treatment restored apolipoprotein E (apoE) and J (apoJ) concentrations to non-pathological values, and Aβ internalization by glial cells was found to be decreased in the presence of these apolipoproteins, we now aimed to test the influence of scFv-h3D6 on Aβ aggregation and cellular uptake by primary human astrocytes in the presence of therapeutic apoE and apoJ mimetic peptides (MPs). Firstly, we demonstrated by CD and FTIR that the molecules used in this work were well folded. Next, interactions between apoE or apoJ-MP, scFv-h3D6 and Aβ were studied by CD. The conformational change induced by the interaction of Aβ with apoE-MP was much bigger than the induced with apoJ-MP, in line with the observed formation of protective worm-like fibrils by the scFv-h3D6/Aβ complex in the presence of apoJ-MP, but not of apoE-MP. ScFv-h3D6, apoJ-MP, and apoE-MP to a different extent reduced Aβ uptake by astrocytes, and apoE-MP partially interfered with the dramatic reduction by scFv-h3D6 while apoJ-MP had no effect on scFv-h3D6 action. As sustained Aβ uptake by astrocytes may impair their normal functions, and ultimately neuronal viability, this work shows another beneficence of scFv-h3D6 treatment, which is not further improved by the use of apoE or apoJ mimetic peptides.
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Affiliation(s)
- Laia Montoliu-Gaya
- Departament de Bioquímica i Biologia Molecular, Facultat de Biociències, Universitat Autònoma de Barcelona, Bellaterra, Barcelona, Spain
| | - Sandra D. Mulder
- Clinical Chemistry Department, Amsterdam Neuroscience, VU University Medical Center, Amsterdam, The Netherlands
| | - Robert Veerhuis
- Clinical Chemistry Department, Amsterdam Neuroscience, VU University Medical Center, Amsterdam, The Netherlands
- Psychiatry Department, Amsterdam Neuroscience, VU University Medical Center, Amsterdam, The Netherlands
- * E-mail: (RV); (SV)
| | - Sandra Villegas
- Departament de Bioquímica i Biologia Molecular, Facultat de Biociències, Universitat Autònoma de Barcelona, Bellaterra, Barcelona, Spain
- * E-mail: (RV); (SV)
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8
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Maser RE, James Lenhard M, Pohlig RT, Babu Balagopal P. Osteopontin and clusterin levels in type 2 diabetes mellitus: differential association with peripheral autonomic nerve function. Neurol Sci 2017; 38:1645-1650. [PMID: 28638999 PMCID: PMC5709198 DOI: 10.1007/s10072-017-3019-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Accepted: 06/03/2017] [Indexed: 12/27/2022]
Abstract
Osteopontin (OPN) and clusterin are secreted glycoproteins potentially associated with nerve function. Sudomotor dysfunction is associated with the development of foot ulcerations. The purpose of this study was to investigate the potential relationship of OPN and clusterin with sudomotor function (i.e., autonomic nerves that control sweating) in participants with type 2 diabetes mellitus (T2DM). Sudomotor function was assessed using SUDOSCAN® which measures electrochemical skin conductance (ESC) of the hands and feet. Demographics (e.g., age, gender, race, body mass index (BMI)), HbA1c, 25-hydroxyvitamin D, creatinine, OPN, and clusterin were also determined for the participants. Fifty individuals with T2DM (age = 59±11 years; 23/27 male/female; 13 African Americans) participated in this study. Lower ESC for the hands and feet were observed in African Americans versus Caucasians/Asians (p < 0.05). No significant ESC differences were observed for good [HbA1c <7%] versus poor [HbA1c ≥7%] glycemic control. With regard to gender, ESC values were lower for the hands for females (p < 0.05). In linear regression with ESC for the hands or feet as the dependent variable, increased OPN levels, but not clusterin, were independently associated with reduced sudomotor function while adjusting for age, gender, race, BMI, and glycemic control (ESC hands model R 2 = 0.504, p < 0.001; ESC feet model R 2 = 0.534, p < 0.001). The association between OPN and reduced sudomotor function found in our study warrants further investigation to delineate the underlying mechanisms and determine if OPN is neuroprotective, involved in the pathogenesis of sudomotor dysfunction, or simply a bystander.
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Affiliation(s)
- Raelene E Maser
- Department of Medical Laboratory Sciences, University of Delaware, 305F Willard Hall Education Building, Newark, DE, 19716, USA.
- Diabetes and Metabolic Research Center, Christiana Care Health System, Newark, DE, 19713, USA.
| | - M James Lenhard
- Diabetes and Metabolic Research Center, Christiana Care Health System, Newark, DE, 19713, USA
- Diabetes and Metabolic Diseases Center, Christiana Care Health System, Wilmington, DE, 19801, USA
| | - Ryan T Pohlig
- Biostatistics Core Facility, University of Delaware, Newark, DE, 19716, USA
| | - P Babu Balagopal
- Biomedical Research & Analysis Laboratory, Nemours Children's Specialty Care & Mayo Clinic College of Medicine, Jacksonville, FL, 32207, USA
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Panayiotou E, Papacharalambous R, Antoniou A, Christophides G, Papageorgiou L, Fella E, Malas S, Kyriakides T. Genetic background modifies amyloidosis in a mouse model of ATTR neuropathy. Biochem Biophys Rep 2016; 8:48-54. [PMID: 28955941 PMCID: PMC5613746 DOI: 10.1016/j.bbrep.2016.08.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2016] [Revised: 07/04/2016] [Accepted: 08/04/2016] [Indexed: 11/29/2022] Open
Abstract
Penetrance and age of onset of ATTRV30M amyloidotic neuropathy varies significantly among different populations. This variability has been attributed to both genetic and environmental modifiers. We studied the effect of genetic background on phenotype in two lines of transgenic mice bearing the same ATTRV30M transgene. Amyloid deposition, transthyretin (TTR), megalin, clusterin and disease markers of endoplasmic reticulum stress, the ubiquitin-proteasome system, apoptosis, and complement activation were assessed with WB and immunohistochemistry in donor and recipient tissue. Our results indicate that genetic background modulates amyloid deposition by influencing TTR handling in recipient tissue and may partly account for the marked variability in penetrance observed in various world populations. Genetic background modulates ATTR amyloid deposition. Genetic background affects pathogenic cascades involved in amyloidogenesis. Megalin and clustering possibly involved in the handing of TTR monomers.
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Affiliation(s)
- E Panayiotou
- Cyprus Institute of Neurology and Genetics, P.O.Box 23462, 1683 Nicosia, Cyprus
| | - R Papacharalambous
- Cyprus Institute of Neurology and Genetics, P.O.Box 23462, 1683 Nicosia, Cyprus
| | - A Antoniou
- Cyprus School of Molecular Medicine, P.O.Box 23462, 1683 Nicosia, Cyprus
| | - G Christophides
- Cyprus School of Molecular Medicine, P.O.Box 23462, 1683 Nicosia, Cyprus
| | - L Papageorgiou
- Cyprus School of Molecular Medicine, P.O.Box 23462, 1683 Nicosia, Cyprus
| | - E Fella
- Cyprus School of Molecular Medicine, P.O.Box 23462, 1683 Nicosia, Cyprus
| | - S Malas
- Cyprus Institute of Neurology and Genetics, P.O.Box 23462, 1683 Nicosia, Cyprus
| | - T Kyriakides
- Cyprus Institute of Neurology and Genetics, P.O.Box 23462, 1683 Nicosia, Cyprus.,Cyprus School of Molecular Medicine, P.O.Box 23462, 1683 Nicosia, Cyprus
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10
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Genereux JC, Wiseman RL. Regulating extracellular proteostasis capacity through the unfolded protein response. Prion 2016; 9:10-21. [PMID: 25946012 DOI: 10.1080/19336896.2015.1011887] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
The extracellular aggregation of proteins into proteotoxic oligomers and amyloid fibrils is implicated in the onset and pathology of numerous diseases referred to as amyloid diseases. All of the proteins that aggregate extracellularly in association with amyloid disease pathogenesis originate in the endoplasmic reticulum (ER) and are secreted through the secretory pathway. Disruptions in ER protein homeostasis or proteostasis (i.e., ER stress) can facilitate the aberrant secretion of misfolded protein conformations to the extracellular space and exacerbate pathologic protein aggregation into proteotoxic species. Activation of an ER stress-responsive signaling pathway, the Unfolded Protein Response (UPR), restores ER proteostasis through the transcriptional regulation of ER proteostasis pathways. In contrast, the functional role for the UPR in regulating extracellular proteostasis during ER stress is poorly defined. We recently identified ERdj3 as a UPR-regulated secreted chaperone that increases extracellular proteostasis capacity in response to ER stress, revealing a previously-unanticipated direct mechanism by which the UPR impacts extracellular proteostasis. Here, we discuss the functional implications of ERdj3 secretion on extracellular proteostasis maintenance and define the mechanisms by which ERdj3 secretion coordinates intra- and extracellular proteostasis environments during ER stress.
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Affiliation(s)
- Joseph C Genereux
- a Department of Molecular & Experimental Medicine; Department of Chemical Physiology ; The Scripps Research Institute ; La Jolla , CA USA
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11
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Abstract
Amyloidosis refers to a group of rare but potentially fatal, protein misfolding diseases. The heart is frequently involved in the most common types, that is, immunoglobulin light chain and transthyretin amyloidosis and is the single most important predictor of patient outcomes. A major limitation in improving patient outcomes, in addition to developing novel therapeutics, is the late diagnosis of the disease. Once suspected, an organ for biopsy should be targeted and the amyloid type should be identified by mass spectrometry. An endomyocardial biopsy should be offered if cardiac involvement is in doubt. Echocardiography, MRI and nuclear imaging can provide valuable diagnostic and prognostic information and can secure the diagnosis if amyloid has been identified in an extracardiac tissue.
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12
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da Costa G, Ribeiro-Silva C, Ribeiro R, Gilberto S, Gomes RA, Ferreira A, Mateus É, Barroso E, Coelho AV, Freire AP, Cordeiro C. Transthyretin Amyloidosis: Chaperone Concentration Changes and Increased Proteolysis in the Pathway to Disease. PLoS One 2015; 10:e0125392. [PMID: 26147092 PMCID: PMC4492746 DOI: 10.1371/journal.pone.0125392] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Accepted: 03/24/2015] [Indexed: 11/18/2022] Open
Abstract
Transthyretin amyloidosis is a conformational pathology characterized by the extracellular formation of amyloid deposits and the progressive impairment of the peripheral nervous system. Point mutations in this tetrameric plasma protein decrease its stability and are linked to disease onset and progression. Since non-mutated transthyretin also forms amyloid in systemic senile amyloidosis and some mutation bearers are asymptomatic throughout their lives, non-genetic factors must also be involved in transthyretin amyloidosis. We discovered, using a differential proteomics approach, that extracellular chaperones such as fibrinogen, clusterin, haptoglobin, alpha-1-anti-trypsin and 2-macroglobulin are overrepresented in transthyretin amyloidosis. Our data shows that a complex network of extracellular chaperones are over represented in human plasma and we speculate that they act synergistically to cope with amyloid prone proteins. Proteostasis may thus be as important as point mutations in transthyretin amyloidosis.
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Affiliation(s)
- Gonçalo da Costa
- Centro de Química e Bioquímica, FCUL, Campo Grande, Lisboa, Portugal
| | | | - Raquel Ribeiro
- Centro de Química e Bioquímica, FCUL, Campo Grande, Lisboa, Portugal
| | - Samuel Gilberto
- Centro de Química e Bioquímica, FCUL, Campo Grande, Lisboa, Portugal
| | - Ricardo A Gomes
- Instituto de Tecnologia Química e Biológica, Av. da República Estação Agronómica Nacional, Oeiras, Portugal
| | - António Ferreira
- Centro de Química e Bioquímica, FCUL, Campo Grande, Lisboa, Portugal
| | - Élia Mateus
- Unidade de Transplantação, Hospital Curry Cabral, Lisboa, Portugal
| | - Eduardo Barroso
- Unidade de Transplantação, Hospital Curry Cabral, Lisboa, Portugal
| | - Ana V Coelho
- Instituto de Tecnologia Química e Biológica, Av. da República Estação Agronómica Nacional, Oeiras, Portugal
| | - Ana Ponces Freire
- Centro de Química e Bioquímica, FCUL, Campo Grande, Lisboa, Portugal
| | - Carlos Cordeiro
- Centro de Química e Bioquímica, FCUL, Campo Grande, Lisboa, Portugal
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13
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Abstract
β2-Microglobulin is responsible for systemic amyloidosis affecting patients undergoing long-term hemodialysis. Its genetic variant D76N causes a very rare form of familial systemic amyloidosis. These two types of amyloidoses differ significantly in terms of the tissue localization of deposits and for major pathological features. Considering how the amyloidogenesis of the β2-microglobulin mechanism has been scrutinized in depth for the last three decades, the comparative analysis of molecular and pathological properties of wild type β2-microglobulin and of the D76N variant offers a unique opportunity to critically reconsider the current understanding of the relation between the protein's structural properties and its pathologic behavior.
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Affiliation(s)
- Monica Stoppini
- From the Department of Molecular Medicine, Institute of Biochemistry, University of Pavia, 27100 Pavia, Italy and
| | - Vittorio Bellotti
- From the Department of Molecular Medicine, Institute of Biochemistry, University of Pavia, 27100 Pavia, Italy and the Wolfson Drug Discovery Unit, Centre for Amyloidosis and Acute Phase Proteins, Division of Medicine, University College London, London NW3 2PF, United Kingdom
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14
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Greene MJ, Klimtchuk ES, Seldin DC, Berk JL, Connors LH. Cooperative stabilization of transthyretin by clusterin and diflunisal. Biochemistry 2014; 54:268-78. [PMID: 25478940 PMCID: PMC4303310 DOI: 10.1021/bi5011249] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
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The
circulating protein transthyretin (TTR) can unfold, oligomerize,
and form highly structured amyloid fibrils that are deposited in tissues,
causing organ damage and disease. This pathogenic process is caused
by a heritable TTR point mutation in cases of familial TTR-related
amyloidosis or wild-type TTR in cases of age-associated amyloidosis
(previously called senile systemic amyloidosis). The TTR amyloid cascade
is hypothesized to begin with the dissociation of the TTR native tetrameric
structure into folded but unstable monomeric TTR subunits. Unfolding
of monomeric TTR initiates an oligomerization process leading to aggregation
and fibril formation. Numerous proteostatic mechanisms for regulating
the TTR amyloid cascade exist. Extracellular chaperones provide an
innate defense against misfolded proteins. Clusterin (CLU), a plasma
protein, has the capacity to recognize exposed hydrophobic regions
of misfolded proteins, shielding them from aggregation. We have previously
demonstrated that CLU is associated with the amyloid fibrils in cardiac
tissues from patients with TTR amyloidosis. In this study, we have
used tetrameric and monomeric TTR structural variants to determine
the ability of CLU to inhibit TTR amyloid fibril formation. Using
circular dichroism spectroscopy, we determined that CLU preferentially
stabilizes monomeric TTR and generates increasingly stable conformations
under acid stress. Moreover, studies using surface plasmon resonance
showed a direct interaction of CLU with high-molecular weight TTR
oligomers. The interactions of CLU with monomeric and aggregated TTR
proceed in a cooperative manner in the presence of diflunisal, a small
molecule drug used to stabilize TTR tetramers.
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Affiliation(s)
- Michael J Greene
- Amyloidosis Center, Boston University School of Medicine , K-507, 715 Albany Street, Boston, Massachusetts 02118, United States
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15
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Brambilla F, Lavatelli F, Di Silvestre D, Valentini V, Palladini G, Merlini G, Mauri P. Shotgun Protein Profile of Human Adipose Tissue and Its Changes in Relation to Systemic Amyloidoses. J Proteome Res 2013; 12:5642-55. [DOI: 10.1021/pr400583h] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
| | - Francesca Lavatelli
- Amyloid
Research and Treatment Center, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
| | | | - Veronica Valentini
- Amyloid
Research and Treatment Center, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
| | - Giovanni Palladini
- Amyloid
Research and Treatment Center, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
- Department
of Molecular Medicine, University of Pavia, Pavia, Italy
| | - Giampaolo Merlini
- Amyloid
Research and Treatment Center, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
- Department
of Molecular Medicine, University of Pavia, Pavia, Italy
| | - Pierluigi Mauri
- Institute for Biomedical Technologies (ITB-CNR), Segrate, Italy
- Institute of Life Sciences, Scuola
Superiore Sant’Anna, Pisa, Italy
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16
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Affiliation(s)
- Amy R. Wyatt
- School of Biological Sciences, University of Wollongong, Wollongong, New South Wales 2522, Australia;
- Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom
| | - Justin J. Yerbury
- School of Biological Sciences, University of Wollongong, Wollongong, New South Wales 2522, Australia;
| | - Heath Ecroyd
- School of Biological Sciences, University of Wollongong, Wollongong, New South Wales 2522, Australia;
| | - Mark R. Wilson
- School of Biological Sciences, University of Wollongong, Wollongong, New South Wales 2522, Australia;
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17
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Roles of Extracellular Chaperones in Amyloidosis. J Mol Biol 2012; 421:499-516. [DOI: 10.1016/j.jmb.2012.01.004] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2011] [Revised: 01/02/2012] [Accepted: 01/03/2012] [Indexed: 01/24/2023]
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18
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Almeida MR, Saraiva MJ. Clearance of extracellular misfolded proteins in systemic amyloidosis: Experience with transthyretin. FEBS Lett 2012; 586:2891-6. [DOI: 10.1016/j.febslet.2012.07.029] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Revised: 07/11/2012] [Accepted: 07/11/2012] [Indexed: 12/22/2022]
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19
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Magalhães J, Saraiva MJ. The heat shock response in FAP: the role of the extracellular chaperone clusterin. Amyloid 2012; 19 Suppl 1:3-4. [PMID: 22512538 DOI: 10.3109/13506129.2012.675370] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Extracellular chaperones, such as clusterin, have been proposed to contribute to extracellular protein homeostasis. In Alzheimer's disease (AD), clusterin was suggested to be involved in fibrillogenesis and extracellular misfolded protein clearance. Here, we study the relevance of clusterin in familial amyloidotic polyneuropathy (FAP). Analysis of clusterin levels by ELISA showed decreased levels in asymptomatic and in FAP patients, which could be regarded as a consequence of clusterin mobilization to tissues. Incubation of a neuroblastoma cell line with transthyretin (TTR) oligomers resulted in secretion of clusterin into the media and binding to oligomeric species, not observed in parallel experiments with soluble TTR. Overall, our results allow us to postulate a putative protective role of clusterin in FAP, namely in the modulation of TTR aggregate formation. Future experiments are required to clarify the role of clusterin in FAP.
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Affiliation(s)
- Joana Magalhães
- IBMC, Instituto de Biologia Molecular e Celular, Porto, Portugal
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