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Starting at the beginning: endoplasmic reticulum proteostasis and systemic amyloid disease. Biochem J 2020; 477:1721-1732. [PMID: 32412081 DOI: 10.1042/bcj20190312] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 04/21/2020] [Accepted: 04/22/2020] [Indexed: 12/20/2022]
Abstract
Systemic amyloid diseases are characterized by the deposition of an amyloidogenic protein as toxic oligomers and amyloid fibrils on tissues distal from the site of protein synthesis. Traditionally, these diseases have been viewed as disorders of peripheral target tissues where aggregates are deposited, and toxicity is observed. However, recent evidence highlights an important role for endoplasmic reticulum (ER) proteostasis pathways within tissues synthesizing and secreting amyloidogenic proteins, such as the liver, in the pathogenesis of these disorders. Here, we describe the pathologic implications of ER proteostasis and its regulation on the toxic extracellular aggregation of amyloidogenic proteins implicated in systemic amyloid disease pathogenesis. Furthermore, we discuss the therapeutic potential for targeting ER proteostasis to reduce the secretion and toxic aggregation of amyloidogenic proteins to mitigate peripheral amyloid-associated toxicity involved in the onset and progression of systemic amyloid diseases.
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Serum amyloid P component promotes formation of distinct aggregated lysozyme morphologies and reduces toxicity in Drosophila flies expressing F57I lysozyme. PLoS One 2020; 15:e0227227. [PMID: 31978114 PMCID: PMC6980568 DOI: 10.1371/journal.pone.0227227] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Accepted: 12/13/2019] [Indexed: 11/19/2022] Open
Abstract
Many conflicting reports about the involvement of serum amyloid P component (SAP) in amyloid diseases have been presented over the years; SAP is known to be a universal component of amyloid aggregates but it has been suggested that it can both induce and suppress amyloid formation. By using our Drosophila model of systemic lysozyme amyloidosis, SAP has previously been shown to reduce the toxicity induced by the expression of the disease-associated lysozyme variant, F57I, in the Drosophila central nervous system. This study further investigates the involvement of SAP in modulating lysozyme toxicity using histochemistry and spectral analyses on the double transgenic WT and F57I lysozyme flies to probe; i) formation of aggregates, ii) morphological differences of the aggregated lysozyme species formed in the presence or absence of SAP, iii) location of lysozyme and iv) co-localisation of lysozyme and SAP in the fly brain. We found that SAP can counteract the toxicity (measured by the reduction in the median survival time) induced by F57I lysozyme by converting toxic F57I species into less toxic amyloid-like structures, as reflected by the spectral changes that p-FTAA undergoes when bound to lysozyme deposits in F57I-F57I-SAP flies as compared to F57I-F57I flies. Indeed, when SAP was introduced to in vitro lysozyme fibril formation, the endpoint fibrils had enhanced ThT fluorescence intensity as compared to lysozyme fibrils alone. This suggests that a general mechanism for SAP's role in amyloid diseases may be to promote the formation of stable, amyloid-like fibrils, thus decreasing the impact of toxic species formed along the aggregation pathway.
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Hasecke F, Miti T, Perez C, Barton J, Schölzel D, Gremer L, Grüning CSR, Matthews G, Meisl G, Knowles TPJ, Willbold D, Neudecker P, Heise H, Ullah G, Hoyer W, Muschol M. Origin of metastable oligomers and their effects on amyloid fibril self-assembly. Chem Sci 2018; 9:5937-5948. [PMID: 30079208 PMCID: PMC6050532 DOI: 10.1039/c8sc01479e] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2018] [Accepted: 06/12/2018] [Indexed: 01/05/2023] Open
Abstract
Assembly of rigid amyloid fibrils with their characteristic cross-β sheet structure is a molecular signature of numerous neurodegenerative and non-neuropathic disorders. Frequently large populations of small globular amyloid oligomers (gOs) and curvilinear fibrils (CFs) precede the formation of late-stage rigid fibrils (RFs), and have been implicated in amyloid toxicity. Yet our understanding of the origin of these metastable oligomers, their role as on-pathway precursors or off-pathway competitors, and their effects on the self-assembly of amyloid fibrils remains incomplete. Using two unrelated amyloid proteins, amyloid-β and lysozyme, we find that gO/CF formation, analogous to micelle formation by surfactants, is delineated by a "critical oligomer concentration" (COC). Below this COC, fibril assembly replicates the sigmoidal kinetics of nucleated polymerization. Upon crossing the COC, assembly kinetics becomes biphasic with gO/CF formation responsible for the lag-free initial phase, followed by a second upswing dominated by RF nucleation and growth. RF lag periods below the COC, as expected, decrease as a power law in monomer concentration. Surprisingly, the build-up of gO/CFs above the COC causes a progressive increase in RF lag periods. Our results suggest that metastable gO/CFs are off-pathway from RF formation, confined by a condition-dependent COC that is distinct from RF solubility, underlie a transition from sigmoidal to biphasic assembly kinetics and, most importantly, not only compete with RFs for the shared monomeric growth substrate but actively inhibit their nucleation and growth.
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Affiliation(s)
- Filip Hasecke
- Institut für Physikalische Biologie , Heinrich-Heine-Universität , 40204 Düsseldorf , Germany .
| | - Tatiana Miti
- Department of Physics , University of South Florida , Tampa , FL 33620 , USA .
| | - Carlos Perez
- Department of Physics , University of South Florida , Tampa , FL 33620 , USA .
| | - Jeremy Barton
- Department of Physics , University of South Florida , Tampa , FL 33620 , USA .
| | - Daniel Schölzel
- Institut für Physikalische Biologie , Heinrich-Heine-Universität , 40204 Düsseldorf , Germany .
- Institute of Complex Systems (ICS-6) , Structural Biochemistry , Research Centre Jülich , Germany
| | - Lothar Gremer
- Institut für Physikalische Biologie , Heinrich-Heine-Universität , 40204 Düsseldorf , Germany .
- Institute of Complex Systems (ICS-6) , Structural Biochemistry , Research Centre Jülich , Germany
| | - Clara S R Grüning
- Institut für Physikalische Biologie , Heinrich-Heine-Universität , 40204 Düsseldorf , Germany .
| | - Garrett Matthews
- Department of Physics , University of South Florida , Tampa , FL 33620 , USA .
| | - Georg Meisl
- Department of Chemistry , University of Cambridge , Lensfield Road , Cambridge CB2 1EW , UK
| | - Tuomas P J Knowles
- Department of Chemistry , University of Cambridge , Lensfield Road , Cambridge CB2 1EW , UK
| | - Dieter Willbold
- Institut für Physikalische Biologie , Heinrich-Heine-Universität , 40204 Düsseldorf , Germany .
- Institute of Complex Systems (ICS-6) , Structural Biochemistry , Research Centre Jülich , Germany
| | - Philipp Neudecker
- Institut für Physikalische Biologie , Heinrich-Heine-Universität , 40204 Düsseldorf , Germany .
- Institute of Complex Systems (ICS-6) , Structural Biochemistry , Research Centre Jülich , Germany
| | - Henrike Heise
- Institut für Physikalische Biologie , Heinrich-Heine-Universität , 40204 Düsseldorf , Germany .
- Institute of Complex Systems (ICS-6) , Structural Biochemistry , Research Centre Jülich , Germany
| | - Ghanim Ullah
- Department of Physics , University of South Florida , Tampa , FL 33620 , USA .
| | - Wolfgang Hoyer
- Institut für Physikalische Biologie , Heinrich-Heine-Universität , 40204 Düsseldorf , Germany .
- Institute of Complex Systems (ICS-6) , Structural Biochemistry , Research Centre Jülich , Germany
| | - Martin Muschol
- Department of Physics , University of South Florida , Tampa , FL 33620 , USA .
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Mocanu MM, Ganea C, Siposova K, Filippi A, Demjen E, Marek J, Bednarikova Z, Antosova A, Baran I, Gazova Z. Polymorphism of hen egg white lysozyme amyloid fibrils influences the cytotoxicity in LLC-PK1 epithelial kidney cells. Int J Biol Macromol 2014; 65:176-87. [PMID: 24444882 DOI: 10.1016/j.ijbiomac.2014.01.030] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Revised: 01/08/2014] [Accepted: 01/13/2014] [Indexed: 01/10/2023]
Abstract
The polymorphism of amyloid fibrils is potentially crucial as it may underlie the natural variability of amyloid diseases and could be important in developing a fuller understanding of the molecular basis of protein deposition disorders. This study examines morphological differences in lysozyme fibrils and the implications of these differences in terms of cytotoxicity. The structural characteristics of amyloid fibrils formed under two different experimental conditions (acidic and neutral) were evaluated using spectroscopic methods, atomic force microscopy and image analysis. Growth curves and apoptotic/necrotic assays were used to determine the cytotoxic effect of fibrils on the LLC-PK1 renal cells. The results reveal that both types of mature lysozyme amyloid fibrils are actively involved in the cytotoxic process, however each exhibit different levels of cytotoxicity. Fibrils formed at acidic pH affect cell growth in a dose-dependent manner, but a threshold-dependent inhibition of cell growth was observed in the case of lysozyme fibrils prepared at neutral pH. Experiments examining the mechanism of the cell death suggest that both types of mature lysozyme fibrils trigger late apoptosis/necrosis at different fibril concentrations. Our findings clearly indicate that the intrinsic differences between amyloid fibrils due to their polymorphism result in different degrees of cytotoxicity.
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Affiliation(s)
- Maria-Magdalena Mocanu
- Department of Biophysics, "Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania
| | - Constanta Ganea
- Department of Biophysics, "Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania
| | - Katarina Siposova
- Department of Biophysics, Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia
| | - Alexandru Filippi
- Department of Biophysics, "Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania
| | - Erna Demjen
- Department of Biophysics, Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia
| | - Jozef Marek
- Department of Biophysics, Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia
| | - Zuzana Bednarikova
- Department of Biophysics, Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia; Department of Biochemistry, Faculty of Science, Safarik University, Kosice, Slovakia
| | - Andrea Antosova
- Department of Biophysics, Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia
| | - Irina Baran
- Department of Biophysics, "Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania
| | - Zuzana Gazova
- Department of Biophysics, Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia; Department of Medical and Clinical Biochemistry and LABMED, Faculty of Medicine, Safarik University, Kosice, Slovakia.
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Kinetics of amyloid aggregation: a study of the GNNQQNY prion sequence. PLoS Comput Biol 2012; 8:e1002782. [PMID: 23209391 PMCID: PMC3510058 DOI: 10.1371/journal.pcbi.1002782] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2012] [Accepted: 09/28/2012] [Indexed: 12/24/2022] Open
Abstract
The small amyloid-forming GNNQQNY fragment of the prion sequence has been the subject of extensive experimental and numerical studies over the last few years. Using unbiased molecular dynamics with the OPEP coarse-grained potential, we focus here on the onset of aggregation in a 20-mer system. With a total of 16.9 of simulations at 280 K and 300 K, we show that the GNNQQNY aggregation follows the classical nucleation theory (CNT) in that the number of monomers in the aggregate is a very reliable descriptor of aggregation. We find that the critical nucleus size in this finite-size system is between 4 and 5 monomers at 280 K and 5 and 6 at 300 K, in overall agreement with experiment. The kinetics of growth cannot be fully accounted for by the CNT, however. For example, we observe considerable rearrangements after the nucleus is formed, as the system attempts to optimize its organization. We also clearly identify two large families of structures that are selected at the onset of aggregation demonstrating the presence of well-defined polymorphism, a signature of amyloid growth, already in the 20-mer aggregate. Protein aggregation plays an important pathological role in numerous neurodegenerative diseases such as Alzheimer's, Parkinson's, Creutzfeldt-Jakob, the Prion disease and diabetes mellitus. In most cases, misfolded proteins are involved and aggregate irreversibly to form highly ordered insoluble macrostructures, called amyloid fibrils, which deposit in the brain. Studies have revealed that all proteins are capable of forming amyloid fibrils that all share common structural features and therefore aggregation mechanisms. The toxicity of amyloid aggregates is however not attributed to the fibrils themselves but rather to smaller more disordered aggregates, oligomers, forming parallel to or prior to fibrils. Understanding the assembly process of these amyloid oligomers is key to understanding their toxicity mechanism in order to devise a possible treatment strategy targeting these toxic aggregates. Our approach here is to computationally study the aggregation dynamics of a 20-mer of an amyloid peptide GNNQQNY from a prion protein. Our findings suggest that the assembly is a spontaneous process that can be described as a complex nucleation and growth mechanism and which can lead to two classes of morphologies for the aggregates, one of which resembles a protofibril-like structure. Such numerical studies are crucial to understanding the details of fast biological processes and complement well experimental studies.
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Trusova VM, Gorbenko GP. Fluorescence study on aggregated lysozyme and lipid bilayer interactions. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2012; 113:51-5. [PMID: 22652331 DOI: 10.1016/j.jphotobiol.2012.05.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Revised: 04/20/2012] [Accepted: 05/01/2012] [Indexed: 11/25/2022]
Abstract
Fluorescent probes 1,6-diphenyl-1,3,5-hexatriene (DPH), pyrene, 4-dimethylaminochalcone (DMC) and 4-p-(dimethylaminostyryl)-1-dodecylpyridinium (DSP-12) have been utilized to monitor the impact of lysozyme (Lz) oligomers on physicochemical properties of phosphatidylcholine/cardiolipin (PC/CL) membranes. Analysis of spectral responses of the employed probes revealed the reduction of membrane free volume and dehydration of lipid bilayer surface upon incorporation of Lz self-assemblies. Hydrophobic interactions were found to control the binding of Lz oligomers to the lipid bilayer. Comparison of the effects of Lz monomers, oligomers and fibrils showed that soluble oligomeric intermediates exert the most destructive influence on membrane properties.
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Affiliation(s)
- Valeriya M Trusova
- Department of Biological and Medical Physics, V.N. Karazin Kharkov National University, 4 Svobody Sq., Kharkov 61022, Ukraine.
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Fändrich M. Oligomeric intermediates in amyloid formation: structure determination and mechanisms of toxicity. J Mol Biol 2012; 421:427-40. [PMID: 22248587 DOI: 10.1016/j.jmb.2012.01.006] [Citation(s) in RCA: 281] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2011] [Revised: 01/03/2012] [Accepted: 01/05/2012] [Indexed: 11/30/2022]
Abstract
Oligomeric intermediates are non-fibrillar polypeptide assemblies that occur during amyloid fibril formation and that are thought to underlie the aetiology of amyloid diseases, such as Alzheimer's disease, Parkinson's disease and Huntington's disease. Focusing primarily on the oligomeric states formed from Alzheimer's disease β-amyloid (Aβ) peptide, this review will make references to other polypeptide systems, highlighting common principles or sequence-specific differences. The covered topics include the structural properties and polymorphism of oligomers, the biophysical mechanism of peptide self-assembly and its role for pathogenicity in amyloid disease. Oligomer-dependent toxicity mechanisms will be explained along with recently emerging possibilities of interference.
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Affiliation(s)
- Marcus Fändrich
- Max-Planck Research Unit for Enzymology of Protein Folding and Martin Luther University Halle-Wittenberg, Weinbergweg 22, 01620 Halle (Saale), Germany.
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Godsie MG, Tolstova AP, Oferkin IV. Use of molecular dynamics simulation in interpreting the atomic force microscopy data. Biophysics (Nagoya-shi) 2010. [DOI: 10.1134/s0006350910030048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Wilhelm K, Darinskas A, Noppe W, Duchardt E, Mok KH, Vukojević V, Schleucher J, Morozova-Roche LA. Protein oligomerization induced by oleic acid at the solid-liquid interface - equine lysozyme cytotoxic complexes. FEBS J 2009; 276:3975-89. [DOI: 10.1111/j.1742-4658.2009.07107.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Chaudhary N, Nagaraj R. Hen lysozyme amyloid fibrils induce aggregation of erythrocytes and lipid vesicles. Mol Cell Biochem 2009; 328:209-15. [DOI: 10.1007/s11010-009-0091-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2008] [Accepted: 03/11/2009] [Indexed: 11/30/2022]
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Morshedi D, Rezaei-Ghaleh N, Ebrahim-Habibi A, Ahmadian S, Nemat-Gorgani M. Inhibition of amyloid fibrillation of lysozyme by indole derivatives − possible mechanism of action. FEBS J 2007; 274:6415-25. [DOI: 10.1111/j.1742-4658.2007.06158.x] [Citation(s) in RCA: 112] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Gharibyan AL, Zamotin V, Yanamandra K, Moskaleva OS, Margulis BA, Kostanyan IA, Morozova-Roche LA. Lysozyme Amyloid Oligomers and Fibrils Induce Cellular Death via Different Apoptotic/Necrotic Pathways. J Mol Biol 2007; 365:1337-49. [PMID: 17134716 DOI: 10.1016/j.jmb.2006.10.101] [Citation(s) in RCA: 165] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2006] [Revised: 10/20/2006] [Accepted: 10/26/2006] [Indexed: 11/19/2022]
Abstract
Among the newly discovered amyloid properties, its cytotoxicity plays a key role. Lysozyme is a ubiquitous protein involved in systemic amyloidoses in vivo and forming amyloid under destabilising conditions in vitro. We characterized both oligomers and fibrils of hen lysozyme by atomic force microscopy and demonstrated their dose (5-50 microM) and time-dependent (6-48 h) effect on neuroblastoma SH-SY5Y cell viability. We revealed that fibrils induce a decrease of cell viability after 6 h due to membrane damage shown by inhibition of WST-1 reduction, early lactate dehydrogenase release, and propidium iodide intake; by contrast, oligomers activate caspases after 6 h but cause the cell viability to decline only after 48 h, as shown by fluorescent-labelled annexin V binding to externalized phosphatidylserine, propidium iodide DNA staining, lactate dehydrogenase release, and by typical apoptotic shrinking of cells. We conclude that oligomers induce apoptosis-like cell death, while the fibrils lead to necrosis-like death. As polymorphism is a common property of an amyloid, we demonstrated that it is not a single uniform species but rather a continuum of cross-beta-sheet-containing amyloids that are cytotoxic. An abundance of lysozyme highlights a universal feature of this phenomenon, indicating that amyloid toxicity should be assessed in all clinical applications involving proteinaceous materials.
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Affiliation(s)
- Anna L Gharibyan
- Department of Medical Biochemistry and Biophysics, Umeå University, SE-901 87 Umeå, Sweden
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