1
|
Robinson J, Sarangi NK, Keyes TE. Role of phosphatidylserine in amyloid-beta oligomerization at asymmetric phospholipid bilayers. Phys Chem Chem Phys 2023; 25:7648-7661. [PMID: 36317678 DOI: 10.1039/d2cp03344e] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Amyloid-beta (Aβ1-42) aggregation triggers neurotoxicity and is linked to Alzheimer's disease. Aβ1-42 oligomers, rather than extended fibrils, adhere to the cell membrane, causing cell death. Phosphatidylserine (PS), an anionic phospholipid, is prevalent in neuronal membranes (< 20 molar percentage) and, while isolated to the cytoplasmic leaflet of the membrane in healthy cells, its exposure in apoptotic cells and migration to exoplasmic leaflet is triggered by oxidative damage to the membrane. It is widely believed that PS plays a crucial role in the Aβ peptide interaction in the membranes of neuronal cells. However, due to the complexity of the cell membrane, it can be challenging to address molecular level understanding of the PS-Aβ binding and oligomerization processes. Herein, we use microcavity supported lipid bilayers (MSLBs) to analyse PS and Aβ1-42 binding, oligomer formation, and membrane damage. MSLBs are a useful model to evaluate protein-membrane interactions because of their cell-like dual aspect fluidity, their addressability and compositional versatility. We used electrochemical impedance spectroscopy (EIS) and confocal fluorescence microscopy to compare the impact of Aβ1-42 on simple zwitterioinic membrane, dioleoylphosphatidylcholine (DOPC), with MSLBs comprised of transversally asymmetric binary DOPC and dioleoylphosphatidylserine (DOPS). Monomeric Aβ1-42 adsorbs weakly to the pristine zwitterionic DOPC membrane without aggregation. Using a membrane integrity test, with pyranine trapped within the cavities beneath the membrane, Aβ1-42 exposure did not result in pyranine leakage, indicating that DOPC membranes were intact. When 10 mol% DOPS was doped asymmetrically into the membrane's outer leaflet, oligomerization of Aβ1-42 monomer was evident in EIS and atomic force microscopy (AFM), and confocal imaging revealed that membrane damage, resulted in extensive pyranine leakage from the pores. The effects were time, and DOPS and Aβ1-42 concentration-dependent. Membrane pore formation was visible within 30 minutes, and oligomerization, membrane-oligomer multilayer, and Aβ1-42 fibril formation evident over 3 to 18 hours. In asymmetric membranes with DOPS localized to the lower leaflet, optothermally (laser induced) damage increased local DOPS concentrations at the distal leaflet, promoting Aβ1-42 aggregation.
Collapse
Affiliation(s)
- Jack Robinson
- School of Chemical Sciences, Dublin City University, Dublin 9, Ireland
| | - Nirod Kumar Sarangi
- School of Chemical Sciences, Dublin City University, Dublin 9, Ireland.,National Center for Sensor Research, Dublin City University, Dublin 9, Ireland.
| | - Tia E Keyes
- School of Chemical Sciences, Dublin City University, Dublin 9, Ireland.,National Center for Sensor Research, Dublin City University, Dublin 9, Ireland.
| |
Collapse
|
2
|
Esmaili M, Eldeeb M. Cellular toxicity of scrapie prions in prion diseases; a biochemical and molecular overview. Mol Biol Rep 2023; 50:1743-1752. [PMID: 36446981 DOI: 10.1007/s11033-022-07806-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 07/15/2022] [Accepted: 07/19/2022] [Indexed: 12/03/2022]
Abstract
Transmissible spongiform encephalopathies (TSEs) or prion diseases consist of a broad range of fatal neurological disorders affecting humans and animals. Contrary to Watson and Crick's 'central dogma', prion diseases are caused by a protein, devoid of DNA involvement. Herein, we briefly review various cellular and biological aspects of prions and prion pathogenesis focusing mainly on historical milestones, biosynthesis, degradation, structure-function of cellular and scrapie forms of prions .
Collapse
Affiliation(s)
- Mansoore Esmaili
- Department of Biochemistry, University of Alberta, Edmonton, AB, Canada.
| | - Mohamed Eldeeb
- Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, QC, Canada.
- Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt.
| |
Collapse
|
3
|
Faller P, Hureau C. Reproducibility Problems of Amyloid-β Self-Assembly and How to Deal With Them. Front Chem 2021; 8:611227. [PMID: 33520935 PMCID: PMC7841044 DOI: 10.3389/fchem.2020.611227] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Accepted: 12/08/2020] [Indexed: 12/25/2022] Open
Abstract
The self-assembly of peptides and proteins into amyloid fibrils and other aggregates are linked to several diseases. One of the most studied cases is the peptide amyloid-β (Aβ), found self-assembled in Alzheimer's disease patients' brains. In test tubes, assays with chemically synthesized or recombinant Aβ are widely investigated to understand the aggregation process and to find modulators, which could be of therapeutic interest. Experience over more than a decade in our laboratory through discussions with colleagues, expertly studying the literature, and as reviewers revealed to us the widely encountered difficulty to control the aggregation and obtain reproducible results in the test tube. However, this issue is scarcely reported and discussed in the publications, which we think hampers strongly the progress in this field and can deceive newcomers. Here, we describe the difficulty and potential reasons to obtain reproducible aggregation data and propose some guidelines for working with it.
Collapse
Affiliation(s)
- Peter Faller
- Institut de Chimie, UMR 7177, CNRS-Université de Strasbourg, Strasbourg, France
| | | |
Collapse
|
4
|
Wang Y, Wang Y, Bharti V, Zhou H, Hoi V, Tan H, Wu Z, Nagakannan P, Eftekharpour E, Wang JF. Upregulation of Thioredoxin-Interacting Protein in Brain of Amyloid-β Protein Precursor/Presenilin 1 Transgenic Mice and Amyloid-β Treated Neuronal Cells. J Alzheimers Dis 2020; 72:139-150. [PMID: 31561358 DOI: 10.3233/jad-190223] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Oxidative stress has been hypothesized to play a role in the pathophysiology of Alzheimer's disease (AD). Previously, we found that total nitrosylated protein levels were increased in the brain of amyloid-β protein precursor (AβPP) and presenilin 1 (PS1) double transgenic mice, an animal model for AD, suggesting that cysteine oxidative protein modification may contribute to this disease. Thioredoxin (Trx) is a major oxidoreductase that can reverse cysteine oxidative modifications such as sulfenylation and nitrosylation, and inhibit oxidative stress. Thioredoxin-interacting protein (Txnip) is an endogenous Trx inhibitor. To understand the involvement of Trx and Txnip in AD development, we investigated Trx and Txnip in the brain of AβPP/PS1 mice. Using immunoblotting analysis, we found that although Trx protein levels were not changed, Txnip protein levels were significantly increased in hippocampus and frontal cortex of 9- and 12-month-old AβPP/PS1 mice when compared to wild-type mice. Txnip protein levels were also increased by amyloid-β treatment in primary cultured mouse cerebral cortical neurons and HT22 mouse hippocampal cells. Using biotin switch and dimedone conjugation methods, we found that amyloid-β treatment increased protein nitrosylation and sulfenylation in HT22 cells. We also found that downregulation of Txnip, using CRISPR/Cas9 method in HT22 cells, attenuated amyloid-β-induced protein nitrosylation and sulfenylation. Our findings suggest that amyloid-β may increase Txnip levels, subsequently inhibiting Trx reducing capability and enhancing protein cysteine oxidative modification. Our findings also indicate that Txnip may be a potential target for the treatment of AD.
Collapse
Affiliation(s)
- Yiran Wang
- Department of Pharmacology and Therapeutics, University of Manitoba, Winnipeg, Canada.,Kleysen Institute for Advanced Medicine, Health Sciences Centre, Winnipeg, Canada
| | - Ying Wang
- Department of Pharmacology and Therapeutics, University of Manitoba, Winnipeg, Canada.,Kleysen Institute for Advanced Medicine, Health Sciences Centre, Winnipeg, Canada
| | - Veni Bharti
- Department of Pharmacology and Therapeutics, University of Manitoba, Winnipeg, Canada.,Kleysen Institute for Advanced Medicine, Health Sciences Centre, Winnipeg, Canada
| | - Hong Zhou
- Department of Pharmacology and Therapeutics, University of Manitoba, Winnipeg, Canada.,Kleysen Institute for Advanced Medicine, Health Sciences Centre, Winnipeg, Canada
| | - Vanessa Hoi
- Department of Pharmacology and Therapeutics, University of Manitoba, Winnipeg, Canada.,Kleysen Institute for Advanced Medicine, Health Sciences Centre, Winnipeg, Canada
| | - Hua Tan
- Department of Pharmacology and Therapeutics, University of Manitoba, Winnipeg, Canada.,Kleysen Institute for Advanced Medicine, Health Sciences Centre, Winnipeg, Canada
| | - Zijian Wu
- Department of Pharmacology and Therapeutics, University of Manitoba, Winnipeg, Canada.,Kleysen Institute for Advanced Medicine, Health Sciences Centre, Winnipeg, Canada
| | - Pandian Nagakannan
- Department of Physiology and Pathophysiology, University of Manitoba, Winnipeg, Canada
| | - Eftekhar Eftekharpour
- Department of Physiology and Pathophysiology, University of Manitoba, Winnipeg, Canada
| | - Jun-Feng Wang
- Department of Pharmacology and Therapeutics, University of Manitoba, Winnipeg, Canada.,Kleysen Institute for Advanced Medicine, Health Sciences Centre, Winnipeg, Canada.,Department of Psychiatry, University of Manitoba, Winnipeg, Canada
| |
Collapse
|
5
|
Mannem R, Yousuf M, Sreerama L. Nanostructures Formed by Custom-Made Peptides Based on Amyloid Peptide Sequences and Their Inhibition by 2-Hydroxynaphthoquinone. Front Chem 2020; 8:684. [PMID: 32850681 PMCID: PMC7424059 DOI: 10.3389/fchem.2020.00684] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Accepted: 06/30/2020] [Indexed: 01/30/2023] Open
Abstract
Extensive research on amyloid fibril formations shows that certain core sequences within Aβ peptide play an important role in their formation. It is impossible to track these events in vivo. Many proteins and peptides with such core sequences form amyloid fibrils and such Aβ sheet mimics have become excellent tools to study amyloid fibril formation and develop therapeutic strategies. A group of peptides based on amyloid peptide sequences obtained from PDB searches, where glycine residues are substituted with alanine and isoleucine, are tested for aggregation by SEM and ThT binding assay. SEM of different peptide sequences showed morphologically different structures such as nanorods, crystalline needles and nanofibrils. The peptides were co-incubated with HNQ (a quinone) to study its effect on the process of aggregation and/or fibrillation. In conclusion, this group of peptides seem to be Aβ sheet mimics and can be very useful in understanding the different morphologies of amyloid fibrils arising from different peptide sequences and the effective strategies to inhibit or anneal them.
Collapse
Affiliation(s)
- Radhika Mannem
- Department of Chemistry and Earth Sciences, Qatar University, Doha, Qatar
| | - Mohammed Yousuf
- Central Laboratory Unit (CLU), Qatar University, Doha, Qatar
| | | |
Collapse
|
6
|
Pradhan K, Das G, Kar C, Mukherjee N, Khan J, Mahata T, Barman S, Ghosh S. Rhodamine-Based Metal Chelator: A Potent Inhibitor of Metal-Catalyzed Amyloid Toxicity. ACS OMEGA 2020; 5:18958-18967. [PMID: 32775897 PMCID: PMC7408195 DOI: 10.1021/acsomega.0c02235] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Accepted: 06/19/2020] [Indexed: 05/28/2023]
Abstract
Alzheimer's disease (AD) exhibits a multitude of syndromes which add up to its complex nature. In AD, amyloid plaques are deposited along with abnormal accumulation of transition-metal ions. These transition-metal ions are redox-active and help to induce the formation of various polymorphic forms of amyloid-β. Amyloid oligomeric and fibrillar aggregates are the main cause for neuronal toxicity. Another reason for neuronal toxicity arises from generation of reactive oxygen species (ROS) catalyzed by redox-active metal ions through Fenton's reaction. In this direction, an Aβ inhibitor possessing the metal chelation property will be the most promising approach against multifaceted AD. Herein, a rhodamine-B-based compound (Rh-BT) has been designed and synthesized. Rhodamine was attached with benzothiazole as a recognition unit for amyloid-β aggregates. The molecule can effectively capture redox metal ions from the Aβ-Cu2+ complex as well as inhibit Aβ self-assembly such as toxic oligomeric and fibrillar aggregates. Various biophysical assays show that Rh-BT interacts with the Aβ peptide, is capable of decreasing metal-induced ROS generation, and inhibits Aβ-Cu2+-induced cytotoxicity. All these results support the multifunctional nature of Rh-BT, which has an Aβ-specific recognition unit. In addition to the above properties, Rh-BT also exhibits good serum stability in vivo and blood-brain barrier permeability. Therefore, Rh-BT can be considered as a potent multifunctional therapeutic for the treatment of AD.
Collapse
Affiliation(s)
- Krishnangsu Pradhan
- Organic
and Medicinal Chemistry and Structural Biology and Bioinformatics
Division, CSIR-Indian Institute of Chemical
Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, West Bengal, India
| | - Gaurav Das
- Organic
and Medicinal Chemistry and Structural Biology and Bioinformatics
Division, CSIR-Indian Institute of Chemical
Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, West Bengal, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Chirantan Kar
- Organic
and Medicinal Chemistry and Structural Biology and Bioinformatics
Division, CSIR-Indian Institute of Chemical
Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, West Bengal, India
| | - Nabanita Mukherjee
- Department
of Bioscience & Bioengineering, Indian
Institute of Technology Jodhpur, NH 65, Surpura Bypass Road, Karwar, Rajasthan 342037, India
| | - Juhee Khan
- Organic
and Medicinal Chemistry and Structural Biology and Bioinformatics
Division, CSIR-Indian Institute of Chemical
Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, West Bengal, India
| | - Tanushree Mahata
- Organic
and Medicinal Chemistry and Structural Biology and Bioinformatics
Division, CSIR-Indian Institute of Chemical
Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, West Bengal, India
| | - Surajit Barman
- Organic
and Medicinal Chemistry and Structural Biology and Bioinformatics
Division, CSIR-Indian Institute of Chemical
Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, West Bengal, India
| | - Surajit Ghosh
- Organic
and Medicinal Chemistry and Structural Biology and Bioinformatics
Division, CSIR-Indian Institute of Chemical
Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, West Bengal, India
- Department
of Bioscience & Bioengineering, Indian
Institute of Technology Jodhpur, NH 65, Surpura Bypass Road, Karwar, Rajasthan 342037, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| |
Collapse
|
7
|
Huichalaf CH, Al-Ramahi I, Park KW, Grunke SD, Lu N, de Haro M, El-Zein K, Gallego-Flores T, Perez AM, Jung SY, Botas J, Zoghbi HY, Jankowsky JL. Cross-species genetic screens to identify kinase targets for APP reduction in Alzheimer's disease. Hum Mol Genet 2020; 28:2014-2029. [PMID: 30753434 DOI: 10.1093/hmg/ddz034] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2018] [Revised: 01/07/2019] [Accepted: 02/01/2019] [Indexed: 12/12/2022] Open
Abstract
An early hallmark of Alzheimer's disease is the accumulation of amyloid-β (Aβ), inspiring numerous therapeutic strategies targeting this peptide. An alternative approach is to destabilize the amyloid beta precursor protein (APP) from which Aβ is derived. We interrogated innate pathways governing APP stability using a siRNA screen for modifiers whose own reduction diminished APP in human cell lines and transgenic Drosophila. As proof of principle, we validated PKCβ-a known modifier identified by the screen-in an APP transgenic mouse model. PKCβ was genetically targeted using a novel adeno-associated virus shuttle vector to deliver microRNA-adapted shRNA via intracranial injection. In vivo reduction of PKCβ initially diminished APP and delayed plaque formation. Despite persistent PKCβ suppression, the effect on APP and amyloid diminished over time. Our study advances this approach for mining druggable modifiers of disease-associated proteins, while cautioning that prolonged in vivo validation may be needed to reveal emergent limitations on efficacy.
Collapse
Affiliation(s)
| | - Ismael Al-Ramahi
- Department of Molecular and Human Genetics.,Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX, USA
| | | | | | - Nan Lu
- Department of Molecular and Human Genetics.,Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX, USA
| | - Maria de Haro
- Department of Molecular and Human Genetics.,Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX, USA
| | - Karla El-Zein
- Department of Molecular and Human Genetics.,Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX, USA
| | - Tatiana Gallego-Flores
- Department of Molecular and Human Genetics.,Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX, USA
| | - Alma M Perez
- Department of Molecular and Human Genetics.,Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX, USA
| | | | - Juan Botas
- Department of Molecular and Human Genetics.,Department of Molecular and Cellular Biology.,Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX, USA
| | - Huda Y Zoghbi
- Department of Neuroscience.,Department of Molecular and Human Genetics.,Department of Pediatrics.,Department of Neurology.,Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX, USA.,Howard Hughes Medical Institute, Baylor College of Medicine, Houston, TX, USA
| | - Joanna L Jankowsky
- Department of Neuroscience.,Department of Molecular and Cellular Biology.,Department of Neurology.,Department of Neurosurgery, Baylor College of Medicine, Houston, TX, USA
| |
Collapse
|
8
|
Kim K, Lee CH, Park CB. Chemical sensing platforms for detecting trace-level Alzheimer's core biomarkers. Chem Soc Rev 2020; 49:5446-5472. [DOI: 10.1039/d0cs00107d] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
This review provides an overview of recent advances in optical and electrical detection of Alzheimer's disease biomarkers in clinically relevant fluids.
Collapse
Affiliation(s)
- Kayoung Kim
- Department of Materials Science and Engineering
- Korea Advanced Institute of Science and Technology (KAIST)
- Daejeon 305-701
- Republic of Korea
| | - Chang Heon Lee
- Department of Materials Science and Engineering
- Korea Advanced Institute of Science and Technology (KAIST)
- Daejeon 305-701
- Republic of Korea
| | - Chan Beum Park
- Department of Materials Science and Engineering
- Korea Advanced Institute of Science and Technology (KAIST)
- Daejeon 305-701
- Republic of Korea
| |
Collapse
|
9
|
Lardenoije R, van den Hove DL, Jung SE, Havermans M, Blackburn P, Liu B, Rutten BP, Lemere CA. Active Amyloid-β Vaccination Results in Epigenetic Changes in the Hippocampus of an Alzheimer’s Disease-Like Mouse Model. Curr Alzheimer Res 2019; 16:861-870. [DOI: 10.2174/1567205016666190827122009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 08/09/2019] [Accepted: 08/21/2019] [Indexed: 12/17/2022]
Abstract
Background:
While evidence accumulates for a role of epigenetic modifications in the
pathophysiological cascade of Alzheimer’s disease (AD), amyloid-β (Aβ)-targeted active immunotherapy
approaches are under investigation to prevent or slow the progression of AD. The impact of Aβ active
vaccines on epigenetic markers has not been studied thus far.
Objective:
The current study aims to establish the relationship between active immunotherapy with a
MER5101-based vaccine (consisting of Aβ1-15 copies conjugated with a 7 aa spacer to the diphtheria
toxoid carrier protein, formulated in a Th2-biased adjuvant) and epigenetic DNA modifications in the
hippocampus of APPswe/PS1dE9 mice.
Methods:
As we previously reported, immunotherapy started when the mice were 10 months of age and
behavioral testing occurred at 14 months of age, after which the mice were sacrificed for further analysis
of their brains. In this add-on study, global levels of DNA methylation and hydroxymethylation, and
DNA methyltransferase 3A (DNMT3A) were determined using quantitative immunohistochemistry, and
compared to our previously analyzed immunization-induced changes in AD-related neuropathology and
cognition.
Results:
Active immunization did not affect global DNA methylation levels but instead, resulted in decreased
DNA hydroxymethylation and DNMT3A levels. Independent of immunization, inverse correlations
with behavioral performance were observed for levels of DNA methylation and hydroxymethylation,
as well as DNMT3A, while Aβ pathology and synaptic markers did not correlate with DNA methylation
levels but did positively correlate with DNA hydroxymethylation and levels of DNMT3A.
Conclusion:
Our results indicate that active Aβ vaccination has significant effects on the epigenome in
the hippocampus of APPswe/PS1dE9 mice, and suggest that DNA methylation and hydroxymethylation
may be involved in cognitive functioning.
Collapse
Affiliation(s)
- Roy Lardenoije
- Department of Neurology, Ann Romney Center for Neurologic Diseases, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - Daniël L.A. van den Hove
- Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience (MHeNS), Maastricht University, Maastricht 6200MD, Netherlands
| | - Sophie E. Jung
- Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience (MHeNS), Maastricht University, Maastricht 6200MD, Netherlands
| | - Monique Havermans
- Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience (MHeNS), Maastricht University, Maastricht 6200MD, Netherlands
| | | | - Bin Liu
- Department of Neurology, Ann Romney Center for Neurologic Diseases, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - Bart P.F. Rutten
- Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience (MHeNS), Maastricht University, Maastricht 6200MD, Netherlands
| | - Cynthia A. Lemere
- Department of Neurology, Ann Romney Center for Neurologic Diseases, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, United States
| |
Collapse
|
10
|
Effects of Single Amino Acid Substitutions on Aggregation and Cytotoxicity Properties of Amyloid β Peptide. Int J Pept Res Ther 2019. [DOI: 10.1007/s10989-018-9693-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
11
|
Grant MKO, Handoko M, Rozga M, Brinkmalm G, Portelius E, Blennow K, Ashe KH, Zahs KR, Liu P. Human cerebrospinal fluid 6E10-immunoreactive protein species contain amyloid precursor protein fragments. PLoS One 2019; 14:e0212815. [PMID: 30817799 PMCID: PMC6394962 DOI: 10.1371/journal.pone.0212815] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Accepted: 02/08/2019] [Indexed: 11/18/2022] Open
Abstract
In a previous study, we reported that levels of two types of protein species-a type of ~55-kDa species and a type of ~15-kDa species-are elevated in the lumbar cerebrospinal fluid (CSF) of cognitively intact elderly individuals who are at risk for Alzheimer's disease (AD). These species are immunoreactive to the monoclonal antibody 6E10, which is directed against amino acids 6-10 of amyloid-β (Aβ), and their levels correlate with levels of total tau and tau phosphorylated at Thr181. In this study, we investigated the molecular composition of these AD-related proteins using immunoprecipitation (IP)/Western blotting coupled with IP/mass spectrometry. We show that canonical Aβ1-40/42 peptides, together with amyloid-β precursor protein (APP) fragments located N-terminally of Aβ, are present in the ~55-kDa, 6E10-immunoreactive species. We demonstrate that APP fragments located N-terminally of Aβ, plus the N-terminal region of Aβ, are present in the ~15-kDa, 6E10-immunoreactive species. These findings add to the catalog of AD-related Aβ/APP species found in CSF and should motivate further study to determine whether these species may serve as biomarkers of disease progression.
Collapse
Affiliation(s)
- Marianne K. O. Grant
- Department of Neurology, University of Minnesota, Minneapolis, Minnesota, United States of America
- N. Bud Grossman Center for Memory Research and Care, University of Minnesota, Minneapolis, Minnesota, United States of America
| | - Maureen Handoko
- Department of Neurology, University of Minnesota, Minneapolis, Minnesota, United States of America
- N. Bud Grossman Center for Memory Research and Care, University of Minnesota, Minneapolis, Minnesota, United States of America
| | - Malgorzata Rozga
- Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry, Sahlgrenska Academy at University of Gothenburg, Mölndal, Sweden
- Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Mölndal, Sweden
| | - Gunnar Brinkmalm
- Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry, Sahlgrenska Academy at University of Gothenburg, Mölndal, Sweden
- Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Mölndal, Sweden
| | - Erik Portelius
- Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry, Sahlgrenska Academy at University of Gothenburg, Mölndal, Sweden
- Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Mölndal, Sweden
| | - Kaj Blennow
- Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry, Sahlgrenska Academy at University of Gothenburg, Mölndal, Sweden
- Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Mölndal, Sweden
| | - Karen H. Ashe
- Department of Neurology, University of Minnesota, Minneapolis, Minnesota, United States of America
- N. Bud Grossman Center for Memory Research and Care, University of Minnesota, Minneapolis, Minnesota, United States of America
- Department of Neuroscience, University of Minnesota, Minneapolis, Minnesota, United States of America
- Geriatric Research, Education, and Clinical Centers, Veterans Affairs Medical Center, Minneapolis, Minnesota, United States of America
| | - Kathleen R. Zahs
- Department of Neurology, University of Minnesota, Minneapolis, Minnesota, United States of America
- N. Bud Grossman Center for Memory Research and Care, University of Minnesota, Minneapolis, Minnesota, United States of America
- * E-mail: (KRZ); (PL)
| | - Peng Liu
- Department of Neurology, University of Minnesota, Minneapolis, Minnesota, United States of America
- N. Bud Grossman Center for Memory Research and Care, University of Minnesota, Minneapolis, Minnesota, United States of America
- * E-mail: (KRZ); (PL)
| |
Collapse
|
12
|
Proteomic analysis of protein homeostasis and aggregation. J Proteomics 2018; 198:98-112. [PMID: 30529741 DOI: 10.1016/j.jprot.2018.12.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2018] [Revised: 11/24/2018] [Accepted: 12/05/2018] [Indexed: 12/13/2022]
Abstract
Protein homeostasis (proteostasis) refers to the ability of cells to preserve the correct balance between protein synthesis, folding and degradation. Proteostasis is essential for optimal cell growth and survival under stressful conditions. Various extracellular and intracellular stresses including heat shock, oxidative stress, proteasome malfunction, mutations and aging-related modifications can result in disturbed proteostasis manifested by enhanced misfolding and aggregation of proteins. To limit protein misfolding and aggregation cells have evolved various strategies including molecular chaperones, proteasome system and autophagy. Molecular chaperones assist folding of proteins, protect them from denaturation and facilitate renaturation of the misfolded polypeptides, whereas proteasomes and autophagosomes remove the irreversibly damaged proteins. The impairment of proteostasis results in protein aggregation that is a major pathological hallmark of numerous age-related disorders, such as cataract, Alzheimer's, Parkinson's, Huntington's, and prion diseases. To discover protein markers and speed up diagnosis of neurodegenerative diseases accompanied by protein aggregation, proteomic tools have increasingly been used in recent years. Systematic and exhaustive analysis of the changes that occur in the proteomes of affected tissues and biofluids in humans or in model organisms is one of the most promising approaches to reveal mechanisms underlying protein aggregation diseases, improve their diagnosis and develop therapeutic strategies. Significance: In this review we outline the elements responsible for maintaining cellular proteostasis and present the overview of proteomic studies focused on protein-aggregation diseases. These studies provide insights into the mechanisms responsible for age-related disorders and reveal new potential biomarkers for Alzheimer's, Parkinson's, Huntigton's and prion diseases.
Collapse
|
13
|
Bhattacharya S, Xu L, Thompson D. Revisiting the earliest signatures of amyloidogenesis: Roadmaps emerging from computational modeling and experiment. WILEY INTERDISCIPLINARY REVIEWS-COMPUTATIONAL MOLECULAR SCIENCE 2018. [DOI: 10.1002/wcms.1359] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Shayon Bhattacharya
- Department of Physics, Bernal InstituteUniversity of LimerickLimerickIreland
| | - Liang Xu
- Department of Physics, Bernal InstituteUniversity of LimerickLimerickIreland
| | - Damien Thompson
- Department of Physics, Bernal InstituteUniversity of LimerickLimerickIreland
| |
Collapse
|
14
|
Multifunctional liposomes interact with Abeta in human biological fluids: Therapeutic implications for Alzheimer's disease. Neurochem Int 2017; 108:60-65. [DOI: 10.1016/j.neuint.2017.02.012] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Revised: 02/17/2017] [Accepted: 02/21/2017] [Indexed: 12/16/2022]
|
15
|
Marcinko TM, Dong J, LeBlanc R, Daborowski KV, Vachet RW. Small molecule-mediated inhibition of β-2-microglobulin-based amyloid fibril formation. J Biol Chem 2017; 292:10630-10638. [PMID: 28468825 DOI: 10.1074/jbc.m116.774083] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Revised: 05/02/2017] [Indexed: 12/26/2022] Open
Abstract
In dialysis patients, β-2 microglobulin (β2m) can aggregate and eventually form amyloid fibrils in a condition known as dialysis-related amyloidosis, which deleteriously affects joint and bone function. Recently, several small molecules have been identified as potential inhibitors of β2m amyloid formation in vitro Here we investigated whether these molecules are more broadly applicable inhibitors of β2m amyloid formation by studying their effect on Cu(II)-induced β2m amyloid formation. Using a variety of biophysical techniques, we also examined their inhibitory mechanisms. We found that two molecules, doxycycline and rifamycin SV, can inhibit β2m amyloid formation in vitro by causing the formation of amorphous, redissolvable aggregates. Rather than interfering with β2m amyloid formation at the monomer stage, we found that doxycycline and rifamycin SV exert their effect by binding to oligomeric species both in solution and in gas phase. Their binding results in a diversion of the expected Cu(II)-induced progression of oligomers toward a heterogeneous collection of oligomers, including trimers and pentamers, that ultimately matures into amorphous aggregates. Using ion mobility mass spectrometry, we show that both inhibitors promote the compaction of the initially formed β2m dimer, which causes the formation of other off-pathway and amyloid-incompetent oligomers that are isomeric with amyloid-competent oligomers in some cases. Overall, our results suggest that doxycycline and rifamycin are general inhibitors of Cu(II)-induced β2m amyloid formation. Interestingly, the putative mechanism of their activity is different depending on how amyloid formation is initiated with β2m, which underscores the complexity of how these structures assemble in vitro.
Collapse
Affiliation(s)
- Tyler M Marcinko
- From the Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003
| | - Jia Dong
- From the Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003
| | - Raquel LeBlanc
- From the Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003
| | - Kate V Daborowski
- From the Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003
| | - Richard W Vachet
- From the Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003
| |
Collapse
|
16
|
Figueira I, Fernandes A, Mladenovic Djordjevic A, Lopez-Contreras A, Henriques CM, Selman C, Ferreiro E, Gonos ES, Trejo JL, Misra J, Rasmussen LJ, Xapelli S, Ellam T, Bellantuono I. Interventions for age-related diseases: Shifting the paradigm. Mech Ageing Dev 2016; 160:69-92. [DOI: 10.1016/j.mad.2016.09.009] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2016] [Revised: 09/18/2016] [Accepted: 09/28/2016] [Indexed: 12/14/2022]
|
17
|
Jesus CSH, Almeida ZL, Vaz DC, Faria TQ, Brito RMM. A New Folding Kinetic Mechanism for Human Transthyretin and the Influence of the Amyloidogenic V30M Mutation. Int J Mol Sci 2016; 17:E1428. [PMID: 27589730 PMCID: PMC5037707 DOI: 10.3390/ijms17091428] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Revised: 08/18/2016] [Accepted: 08/23/2016] [Indexed: 02/04/2023] Open
Abstract
Protein aggregation into insoluble amyloid fibrils is the hallmark of several neurodegenerative diseases, chief among them Alzheimer's and Parkinson's. Although caused by different proteins, these pathologies share some basic molecular mechanisms with familial amyloidotic polyneuropathy (FAP), a rare hereditary neuropathy caused by amyloid formation and deposition by transthyretin (TTR) in the peripheral and autonomic nervous systems. Among the amyloidogenic TTR mutations known, V30M-TTR is the most common in FAP. TTR amyloidogenesis (ATTR) is triggered by tetramer dissociation, followed by partial unfolding and aggregation of the low conformational stability monomers formed. Thus, tetramer dissociation kinetics, monomer conformational stability and competition between refolding and aggregation pathways do play a critical role in ATTR. Here, we propose a new model to analyze the refolding kinetics of WT-TTR and V30M-TTR, showing that at pH and protein concentrations close to physiological, a two-step mechanism with a unimolecular first step followed by a second-order second step adjusts well to the experimental data. Interestingly, although sharing the same kinetic mechanism, V30M-TTR refolds at a much slower rate than WT-TTR, a feature that may favor the formation of transient species leading to kinetic partition into amyloidogenic pathways and, thus, significantly increasing the probability of amyloid formation in vivo.
Collapse
Affiliation(s)
- Catarina S H Jesus
- Chemistry Department and Coimbra Chemistry Centre, Faculty of Science and Technology, University of Coimbra, Coimbra 3004-535, Portugal.
- Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra 3004-504, Portugal.
| | - Zaida L Almeida
- Chemistry Department and Coimbra Chemistry Centre, Faculty of Science and Technology, University of Coimbra, Coimbra 3004-535, Portugal.
- Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra 3004-504, Portugal.
| | - Daniela C Vaz
- Chemistry Department and Coimbra Chemistry Centre, Faculty of Science and Technology, University of Coimbra, Coimbra 3004-535, Portugal.
- Health Research Unit, School of Health Sciences, Leiria 2411-901, Portugal.
| | - Tiago Q Faria
- Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra 3004-504, Portugal.
| | - Rui M M Brito
- Chemistry Department and Coimbra Chemistry Centre, Faculty of Science and Technology, University of Coimbra, Coimbra 3004-535, Portugal.
- Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra 3004-504, Portugal.
| |
Collapse
|
18
|
Goldblatt G, Matos JO, Gornto J, Tatulian SA. Isotope-edited FTIR reveals distinct aggregation and structural behaviors of unmodified and pyroglutamylated amyloid β peptides. Phys Chem Chem Phys 2016. [PMID: 26214017 DOI: 10.1039/c5cp03343h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Amyloid β peptide (Aβ) is causatively associated with Alzheimer's disease (AD), and N-terminally truncated and pyroglutamylated Aβ peptides (AβpE) exert hypertoxic effect by an unknown mechanism. Recent evidence has identified the prefibrillar oligomers of Aβ, not the fibrils, as the prevalent cytotoxic species. Structural characterization of Aβ and AβpE oligomers is therefore important for better understanding of their toxic effect. Here we have used isotope-edited Fourier transform infrared (FTIR) spectroscopy to identify the conformational changes in Aβ(1-42) and AβpE(3-42) upon aggregation, individually and in 1 : 1 molar combination. During the first two hours of exposure to aqueous buffer, the peptides undergo transition from mostly α-helical to mostly β-sheet structure. Data on peptides (13)C,(15)N-labeled at K(16)L(17)V(18) or V(36)G(37)G(38)V(39) allowed construction of structural models for the monomer and early oligomers. The peptide monomer comprises a β-hairpin that involves residues upstream of the K(16)L(17)V(18) sequence and an N-terminal α-helix. The oligomers form by non-H-bonding interactions between the β-strands of neighboring β-hairpins, in lateral or staggered manner, with the strands running parallel or antiparallel. Relative α-helical and β-sheet propensities of Aβ(1-42) and AβpE(3-42) depend on the ionic strength of the buffer, emphasizing the importance of ionic interactions in Aβ peptide structure and aggregation. It is inferred that N-terminal modification of AβpE(3-42) affects the helix stability and thereby modulates β-sheet oligomer formation. The data thus provide new insight into the molecular mechanism of Aβ oligomerization by emphasizing the role of the N-terminal transient α-helical structure and by identifying structural constraints for molecular organization of the oligomers.
Collapse
Affiliation(s)
- Greg Goldblatt
- Biomedical Sciences Graduate Program, University of Central Florida, Orlando, FL, USA
| | - Jason O Matos
- Biotechnology Graduate Program, University of Central Florida, Orlando, FL, USA
| | - Jeremy Gornto
- Undergraduate student, University of Central Florida, Orlando, FL, USA
| | - Suren A Tatulian
- Department of Physics, Physical Sciences Room 456, University of Central Florida, 4111 Libra Drive, Orlando, Florida 32816-2385, USA.
| |
Collapse
|
19
|
Nagel-Steger L, Owen MC, Strodel B. An Account of Amyloid Oligomers: Facts and Figures Obtained from Experiments and Simulations. Chembiochem 2016; 17:657-76. [PMID: 26910367 DOI: 10.1002/cbic.201500623] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Indexed: 12/27/2022]
Abstract
The deposition of amyloid in brain tissue in the context of neurodegenerative diseases involves the formation of intermediate species-termed oligomers-of lower molecular mass and with structures that deviate from those of mature amyloid fibrils. Because these oligomers are thought to be primarily responsible for the subsequent disease pathogenesis, the elucidation of their structure is of enormous interest. Nevertheless, because of the high aggregation propensity and the polydispersity of oligomeric species formed by the proteins or peptides in question, the preparation of appropriate samples for high-resolution structural methods has proven to be rather difficult. This is why theoretical approaches have been of particular importance in gaining insights into possible oligomeric structures for some time. Only recently has it been possible to achieve some progress with regard to the experimentally based structural characterization of defined oligomeric species. Here we discuss how theory and experiment are used to determine oligomer structures and what can be done to improve the integration of the two disciplines.
Collapse
Affiliation(s)
- Luitgard Nagel-Steger
- Institute of Complex Systems: Structural Biochemistry (ICS-6), Forschungszentrum Jülich, 52425, Jülich, Germany.,Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf, Universitätstrasse 1, 40225, Düsseldorf, Germany
| | - Michael C Owen
- Institute of Complex Systems: Structural Biochemistry (ICS-6), Forschungszentrum Jülich, 52425, Jülich, Germany
| | - Birgit Strodel
- Institute of Complex Systems: Structural Biochemistry (ICS-6), Forschungszentrum Jülich, 52425, Jülich, Germany. .,Institute of Theoretical and Computational Chemistry, Heinrich Heine University Düsseldorf, Universitätstrasse 1, 40225, Düsseldorf, Germany.
| |
Collapse
|