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Borbély E, Varga V, Szögi T, Schuster I, Bozsó Z, Penke B, Fülöp L. Impact of Two Neuronal Sigma-1 Receptor Modulators, PRE084 and DMT, on Neurogenesis and Neuroinflammation in an Aβ 1-42-Injected, Wild-Type Mouse Model of AD. Int J Mol Sci 2022; 23:2514. [PMID: 35269657 PMCID: PMC8910266 DOI: 10.3390/ijms23052514] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 02/14/2022] [Accepted: 02/23/2022] [Indexed: 02/01/2023] Open
Abstract
Alzheimer's disease (AD) is the most common form of dementia characterized by cognitive dysfunctions. Pharmacological interventions to slow the progression of AD are intensively studied. A potential direction targets neuronal sigma-1 receptors (S1Rs). S1R ligands are recognized as promising therapeutic agents that may alleviate symptom severity of AD, possibly via preventing amyloid-β-(Aβ-) induced neurotoxicity on the endoplasmic reticulum stress-associated pathways. Furthermore, S1Rs may also modulate adult neurogenesis, and the impairment of this process is reported to be associated with AD. We aimed to investigate the effects of two S1R agonists, dimethyltryptamine (DMT) and PRE084, in an Aβ-induced in vivo mouse model characterizing neurogenic and anti-neuroinflammatory symptoms of AD, and the modulatory effects of S1R agonists were analyzed by immunohistochemical methods and western blotting. DMT, binding moderately to S1R but with high affinity to 5-HT receptors, negatively influenced neurogenesis, possibly as a result of activating both receptors differently. In contrast, the highly selective S1R agonist PRE084 stimulated hippocampal cell proliferation and differentiation. Regarding neuroinflammation, DMT and PRE084 significantly reduced Aβ1-42-induced astrogliosis, but neither had remarkable effects on microglial activation. In summary, the highly selective S1R agonist PRE084 may be a promising therapeutic agent for AD. Further studies are required to clarify the multifaceted neurogenic and anti-neuroinflammatory roles of these agonists.
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Affiliation(s)
| | | | | | | | | | | | - Lívia Fülöp
- Department of Medical Chemistry, University of Szeged, Dóm Tér 8, H-6720 Szeged, Hungary; (E.B.); (V.V.); (T.S.); (I.S.); (Z.B.); (B.P.)
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Lin YT, Shi QQ, Zhang L, Yue CP, He ZJ, Li XX, He QJ, Liu Q, Du XB. Hydrogen-rich water ameliorates neuropathological impairments in a mouse model of Alzheimer's disease through reducing neuroinflammation and modulating intestinal microbiota. Neural Regen Res 2022; 17:409-417. [PMID: 34269217 PMCID: PMC8464006 DOI: 10.4103/1673-5374.317992] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 11/19/2020] [Accepted: 03/18/2021] [Indexed: 11/04/2022] Open
Abstract
Hydrogen exhibits the potential to treat Alzheimer's disease. Stereotactic injection has been previously used as an invasive method of administering active hydrogen, but this method has limitations in clinical practice. In this study, triple transgenic (3×Tg) Alzheimer's disease mice were treated with hydrogen-rich water for 7 months. The results showed that hydrogen-rich water prevented synaptic loss and neuronal death, inhibited senile plaques, and reduced hyperphosphorylated tau and neurofibrillary tangles in 3×Tg Alzheimer's disease mice. In addition, hydrogen-rich water improved brain energy metabolism disorders and intestinal flora imbalances and reduced inflammatory reactions. These findings suggest that hydrogen-rich water is an effective hydrogen donor that can treat Alzheimer's disease. This study was approved by the Animal Ethics and Welfare Committee of Shenzhen University, China (approval No. AEWC-20140615-002) on June 15, 2014.
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Affiliation(s)
- Yi-Tong Lin
- College of Life Sciences and Oceanography, Guangdong Provincial Key Laboratory for Plant Epigenetics, Shenzhen University, Shenzhen, Guangdong Province, China
| | - Qing-Qing Shi
- College of Life Sciences and Oceanography, Guangdong Provincial Key Laboratory for Plant Epigenetics, Shenzhen University, Shenzhen, Guangdong Province, China
| | - Lei Zhang
- College of Life Sciences and Oceanography, Guangdong Provincial Key Laboratory for Plant Epigenetics, Shenzhen University, Shenzhen, Guangdong Province, China
| | - Cai-Ping Yue
- College of Life Sciences and Oceanography, Guangdong Provincial Key Laboratory for Plant Epigenetics, Shenzhen University, Shenzhen, Guangdong Province, China
| | - Zhi-Jun He
- College of Life Sciences and Oceanography, Guangdong Provincial Key Laboratory for Plant Epigenetics, Shenzhen University, Shenzhen, Guangdong Province, China
| | - Xue-Xia Li
- College of Life Sciences and Oceanography, Guangdong Provincial Key Laboratory for Plant Epigenetics, Shenzhen University, Shenzhen, Guangdong Province, China
| | - Qian-Jun He
- Guangdong Provincial Key Laboratory of Biomedical Measurements and Ultrasound Imaging, National-Regional Key Technology Engineering Laboratory for Medical Ultrasound, School of Biomedical Engineering, Health Science Center, Shenzhen University, Shenzhen, Guangdong Province, China
| | - Qiong Liu
- College of Life Sciences and Oceanography, Guangdong Provincial Key Laboratory for Plant Epigenetics, Shenzhen University, Shenzhen, Guangdong Province, China
| | - Xiu-Bo Du
- College of Life Sciences and Oceanography, Guangdong Provincial Key Laboratory for Plant Epigenetics, Shenzhen University, Shenzhen, Guangdong Province, China
- Shenzhen Bay Laboratory, Shenzhen, Guangdong Province, China
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The interacting rotifer-biopolymers are anti- and disaggregating agents for human-type beta-amyloid in vitro. Int J Biol Macromol 2022; 201:262-269. [PMID: 34999044 DOI: 10.1016/j.ijbiomac.2021.12.184] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Revised: 12/17/2021] [Accepted: 12/29/2021] [Indexed: 01/06/2023]
Abstract
Neurodegeneration-related human-type beta-amyloid 1-42 aggregates (H-Aβ) are one of the biochemical markers and executive molecules in Alzheimer's disease. The exogenic rotifer-specific biopolymer, namely Rotimer, has a protective effect against H-Aβ toxicity on Euchlanis dilatata and Lecane bulla monogonant rotifers. Due to the external particle-dependent secreting activity of these animals, this natural exudate exists in a bound form on the surface of epoxy-metal beads, named as Rotimer Inductor Conglomerate (RIC). In this current work the experiential in vitro molecular interactions between Rotimer and Aβs are presented. The RIC form was uniformly used against H-Aβ aggregation processes in stagogram- and fluorescent-based experiments. These well-known cell-toxic aggregates stably and quickly (only taking a few minutes) bind to RIC. The epoxy beads (as carriers) alone or the scrambled version of H-Aβ (with random amino acid sequence) were the ineffective and inactive negative controls of this experimental system. The RIC has significant interacting, anti-aggregating and disaggregating effects on H-Aβ. To detect these experiments, Bis-ANS and Thioflavin T were applied during amyloid binding, two aggregation-specific functional fluorescent dyes with different molecular characteristics. This newly described empirical interaction of Rotimer with H-Aβ is a potential starting point and source of innovation concerning targeted human- and pharmaceutical applications.
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Decker Y, Németh E, Schomburg R, Chemla A, Fülöp L, Menger MD, Liu Y, Fassbender K. Decreased pH in the aging brain and Alzheimer's disease. Neurobiol Aging 2021; 101:40-49. [PMID: 33578193 DOI: 10.1016/j.neurobiolaging.2020.12.007] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 12/02/2020] [Accepted: 12/05/2020] [Indexed: 10/22/2022]
Abstract
Using publicly available data sets, we compared pH in the human brain and the cerebrospinal fluid (CSF) of postmortem control and Alzheimer's disease cases. We further investigated the effects of long-term acidosis in vivo in the APP-PS1 mouse model of Alzheimer's disease. We finally examined in vitro whether low pH exposure could modulate the release of proinflammatory cytokines and the uptake of amyloid beta by microglia. In the human brain, pH decreased with aging. Similarly, we observed a reduction of pH in the brain of C57BL/6 mice with age. In addition, independent database analyses revealed that postmortem brain and CSF pH is further reduced in Alzheimer's disease cases compared with controls. Moreover, in vivo experiments showed that low pH CSF infusion increased amyloid beta plaque load in APP-PS1 mice. We further observed that mild acidosis reduced the amyloid beta 42-induced release of tumor necrosis factor-alpha by microglia and their capacity to uptake this peptide. Brain acidosis is associated with aging and might affect pathophysiological processes such as amyloid beta aggregation or inflammation in Alzheimer's disease.
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Affiliation(s)
- Yann Decker
- Department of Neurology, University of the Saarland, Homburg/Saar, Germany; German Institute for Dementia Prevention (DIDP), University of the Saarland, Homburg/Saar, Germany.
| | - Eszter Németh
- Department of Neurology, University of the Saarland, Homburg/Saar, Germany; German Institute for Dementia Prevention (DIDP), University of the Saarland, Homburg/Saar, Germany
| | - Robert Schomburg
- Rehaklinik Zihlschlacht, Neurologisches Rehabilitationszentrum, Zihlschlacht, Switzerland
| | - Axel Chemla
- Department of Neurology, University of the Saarland, Homburg/Saar, Germany; German Institute for Dementia Prevention (DIDP), University of the Saarland, Homburg/Saar, Germany
| | - Lívia Fülöp
- Department of Medical Chemistry, University of Szeged, Szeged, Hungary
| | - Michael D Menger
- Institute for Clinical and Experimental Surgery, Saarland University, Homburg/Saar, Germany
| | - Yang Liu
- Department of Neurology, University of the Saarland, Homburg/Saar, Germany; German Institute for Dementia Prevention (DIDP), University of the Saarland, Homburg/Saar, Germany
| | - Klaus Fassbender
- Department of Neurology, University of the Saarland, Homburg/Saar, Germany; German Institute for Dementia Prevention (DIDP), University of the Saarland, Homburg/Saar, Germany.
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Neurodegeneration-related beta-amyloid as autocatabolism-attenuator in a micro-in vivo system. IBRO Rep 2020; 9:319-323. [PMID: 33336107 PMCID: PMC7733039 DOI: 10.1016/j.ibror.2020.10.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Accepted: 10/02/2020] [Indexed: 11/24/2022] Open
Abstract
Bdelloids are adaptive models for studying aggregate-metabolism interactions. Starvation causes reversible organ shrinkage in bdelloids. The organ shrinkage is in connection with autocatabolic processes. Beta-amyloid attenuates the starvation-induced germovitellaria shrinkage. Human-type amyloid-aggregates are metabolism-regulators in two bdelloid species.
Investigation of human neurodegeneration-related aggregates of beta-amyloid 1–42 (Aβ42) on bdelloid rotifers is a novel interdisciplinary approach in life sciences. We reapplied an organ size-based in vivo monitoring system, exploring the autocatabolism-related alterations evoked by Aβ42, in a glucose-supplemented starvation model. The experientially easy-to-follow size reduction of the bilateral reproductive organ (germovitellaria) in fasted rotifers was rescued by Aβ42, serving as a nutrient source- and peptide sequence-specific attenuator of the organ shrinkage phase and enhancer of the regenerative one including egg reproduction. Recovery of the germovitellaria was significant in comparison with the greatly shrunken form. In contrast to the well-known neurotoxic Aβ42 (except the bdelloids) with specific regulatory roles, the artificially designed scrambled version (random order of amino acids) was inefficient in autocatabolism attenuation, behaving as negative control. This native Aβ42-related modulation of the ‘functionally reversible organ shrinkage’ can be a potential experiential and supramolecular marker of autocatabolism in vivo.
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Key Words
- AO, acridine orange
- AVOs, acidic vesicular organelles
- Acridine orange (PubChem CID: 62344)
- Autocatabolism
- Aβ, beta-amyloid
- Bdelloid rotifer
- Beta-amyloid
- BisANS (PubChem CID: 16213473)
- BisANS, 4,4′-dianilino-1,1′-binaphthyl-5,5′-disulfonic acid dipotassium salt
- ConA, Concanamycin A
- Concanamycin A (PubChem CID: 6438151)
- D0, Day 0
- D20, Day 20
- D25, Day 25
- FROS, functionally reversible organ shrinkage
- FROSi, FROS index
- Invertebrate
- Metabolism
- NFI%, percentage of normalized fluorescence intensity
- NaOH (PubChem CID: 14798)
- Neutral red (PubChem CID: 11105)
- Organ shrinkage
- PI, propidium-iodide
- Propidium-iodide (PubChem CID: 104981)
- S-Aβ42, scrambled isoform of Aβ
- SEM, standard error of the mean
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Yoshiya T. Synthesis of O-Acyl Isopeptides: Stepwise and Convergent Solid-Phase Synthesis. Methods Mol Biol 2020; 2103:129-138. [PMID: 31879922 DOI: 10.1007/978-1-0716-0227-0_8] [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] [Indexed: 06/10/2023]
Abstract
The O-acyl isopeptide method was developed for the preparation of difficult sequence-containing peptides, whose hydrophobic nature hampers both peptide chain construction on resin and purification with HPLC after deprotection. In the O-acyl isopeptide method, the target peptide is synthesized in an O-acyl isopeptide form, which contains an O-acyl isopeptide bond instead of the native N-acyl peptide bond at a hydroxy group-containing amino acid residue, such as Ser or Thr. The hydrophilic O-acyl isopeptide can be isolated, e.g., as a lyophilized TFA salt. The target peptide can be quantitatively obtained by a final O-to-N intramolecular acyl migration reaction with exposure to neutral conditions. Additionally, the O-acyl isopeptide is important as a hydrophilic precursor peptide for biological peptide assays that are difficult to handle. This chapter describes the synthesis of such O-acyl isopeptides by stepwise and convergent Fmoc solid-phase peptide synthesis.
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Affiliation(s)
- Taku Yoshiya
- Peptide Institute, Inc., Ibaraki-Shi, Osaka, Japan.
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Mechanisms Associated with Type 2 Diabetes as a Risk Factor for Alzheimer-Related Pathology. Mol Neurobiol 2019; 56:5815-5834. [PMID: 30684218 DOI: 10.1007/s12035-019-1475-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 01/10/2019] [Indexed: 12/19/2022]
Abstract
Current evidence suggests dementia and pathology in Alzheimer's Disease (AD) are both dependent and independent of amyloid processing and can be induced by multiple 'hits' on vital neuronal functions. Type 2 diabetes (T2D) poses the most important risk factor for developing AD after ageing and dysfunctional IR/PI3K/Akt signalling is a major contributor in both diseases. We developed a model of T2D, coupling subdiabetogenic doses of streptozotocin (STZ) with a human junk food (HJF) diet to more closely mimic the human condition. Over 35 weeks, this induced classic signs of T2D (hyperglycemia and insulin dysfunction) and a modest, but stable deficit in spatial recognition memory, with very little long-term modification of proteins in or associated with IR/PI3K/Akt signalling in CA1 of the hippocampus. Intracerebroventricular infusion of soluble amyloid beta 42 (Aβ42) to mimic the early preclinical rise in Aβ alone induced a more severe, but short-lasting deficits in memory and deregulation of proteins. Infusion of Aβ on the T2D phenotype exacerbated and prolonged the memory deficits over approximately 4 months, and induced more severe aberrant regulation of proteins associated with autophagy, inflammation and glucose uptake from the periphery. A mild form of environmental enrichment transiently rescued memory deficits and could reverse the regulation of some, but not all protein changes. Together, these data identify mechanisms by which T2D could create a modest dysfunctional neuronal milieu via multiple and parallel inputs that permits the development of pathological events identified in AD and memory deficits when Aβ levels are transiently effective in the brain.
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Gera J, Szögi T, Bozsó Z, Fülöp L, Barrera EE, Rodriguez AM, Méndez L, Delpiccolo CM, Mata EG, Cioffi F, Broersen K, Paragi G, Enriz RD. Searching for improved mimetic peptides inhibitors preventing conformational transition of amyloid-β42 monomer. Bioorg Chem 2018; 81:211-221. [DOI: 10.1016/j.bioorg.2018.08.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Revised: 08/10/2018] [Accepted: 08/13/2018] [Indexed: 01/14/2023]
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Bartus É, Olajos G, Schuster I, Bozsó Z, Deli MA, Veszelka S, Walter FR, Datki Z, Szakonyi Z, Martinek TA, Fülöp L. Structural Optimization of Foldamer-Dendrimer Conjugates as Multivalent Agents against the Toxic Effects of Amyloid Beta Oligomers. Molecules 2018; 23:molecules23102523. [PMID: 30279351 PMCID: PMC6222781 DOI: 10.3390/molecules23102523] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 09/20/2018] [Accepted: 09/28/2018] [Indexed: 01/22/2023] Open
Abstract
Alzheimer’s disease is one of the most common chronic neurodegenerative disorders. Despite several in vivo and clinical studies, the cause of the disease is poorly understood. Currently, amyloid β (Aβ) peptide and its tendency to assemble into soluble oligomers are known as a main pathogenic event leading to the interruption of synapses and brain degeneration. Targeting neurotoxic Aβ oligomers can help recognize the disease at an early stage or it can be a potential therapeutic approach. Unnatural β-peptidic foldamers are successfully used against many different protein targets due to their favorable structural and pharmacokinetic properties compared to small molecule or protein-like drug candidates. We have previously reported a tetravalent foldamer-dendrimer conjugate which can selectively bind Aβ oligomers. Taking advantage of multivalency and foldamers, we synthesized different multivalent foldamer-based conjugates to optimize the geometry of the ligand. Isothermal titration calorimetry (ITC) was used to measure binding affinity to Aβ, thereafter 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) based tissue viability assay and impedance-based viability assay on SH-SY5Y cells were applied to monitor Aβ toxicity and protective effects of the compounds. Important factors for high binding affinity were determined and a good correlation was found between influencing the valence and the capability of the conjugates for Aβ binding.
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Affiliation(s)
- Éva Bartus
- Department of Medical Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary.
| | - Gábor Olajos
- Department of Medical Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary.
| | - Ildikó Schuster
- Department of Medical Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary.
| | - Zsolt Bozsó
- Department of Medical Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary.
| | - Mária A Deli
- Institute of Biophysics, Biological Research Center of HAS, Temesvári krt. 26, H-6726 Szeged, Hungary.
| | - Szilvia Veszelka
- Institute of Biophysics, Biological Research Center of HAS, Temesvári krt. 26, H-6726 Szeged, Hungary.
| | - Fruzsina R Walter
- Institute of Biophysics, Biological Research Center of HAS, Temesvári krt. 26, H-6726 Szeged, Hungary.
| | - Zsolt Datki
- Department of Psychiatry, University of Szeged, Kálvária sgt. 57, H-6725 Szeged, Hungary.
| | - Zsolt Szakonyi
- Institute of Pharmaceutical Chemistry, University of Szeged, Eötvös u. 6, H-6720 Szeged, Hungary.
| | - Tamás A Martinek
- Department of Medical Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary.
| | - Livia Fülöp
- Department of Medical Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary.
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Datki Z, Olah Z, Hortobagyi T, Macsai L, Zsuga K, Fulop L, Bozso Z, Galik B, Acs E, Foldi A, Szarvas A, Kalman J. Exceptional in vivo catabolism of neurodegeneration-related aggregates. Acta Neuropathol Commun 2018; 6:6. [PMID: 29378654 PMCID: PMC5789616 DOI: 10.1186/s40478-018-0507-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Accepted: 01/11/2018] [Indexed: 01/20/2023] Open
Abstract
Neurodegenerative diseases are linked to a systemic enzyme resistance of toxic aggregated molecules and their pathological consequences. This paper presents a unique phenomenon that Philodina acuticornis, a bdelloid rotifer, is able to catabolize different types of neurotoxic peptide and protein aggregates (such as beta-amyloids /Aβ/, alpha-synuclein, and prion) without suffering any damage. P. acuticornis is capable of using these aggregates as an exclusive energy source (i.e., as 'food', identified in the digestive system and body) in a hermetically isolated microdrop environment, increasing their survival. As regards Aβ1-42, five other bdelloid rotifer species were also found to be able to perform this phenomenon. Based on our experiments, the Aβ1-42-treated bdelloid rotifers demonstrate significantly increased survival (e.g. mean lifespan = 51 ± 2.71 days) compared to their untreated controls (e.g. mean lifespan = 14 ± 2.29 days), with similar improvements in a variety of phenotypic characteristics. To our knowledge, no other animal species have so far been reported to have a similar capability. For all other microscopic species tested, including monogonant rotifers and non-rotifers, the treatment with Aβ1-42 aggregates proved to be either toxic or simply ineffective. This paper describes and proves the existence of an unprecedented in vivo catabolic capability of neurotoxic aggregates by bdelloid rotifers, with special focus on P. acuticornis. Our results may provide the basis for a new preclinical perspective on therapeutic research in human neurodegenerative diseases.
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Affiliation(s)
- Zsolt Datki
- Department of Psychiatry, Faculty of Medicine, University of Szeged, Kalvaria sgt. 57, Szeged, H-6725, Hungary.
| | - Zita Olah
- Department of Psychiatry, Faculty of Medicine, University of Szeged, Kalvaria sgt. 57, Szeged, H-6725, Hungary
| | - Tibor Hortobagyi
- MTA-DE Cerebrovascular and Neurodegenerative Research Group, Department of Neuropathology, Institute of Pathology, University of Debrecen, P.O. Box 24, Debrecen, H-4012, Hungary
- Department of Old Age Psychiatry, Institute of Psychiatry Psychology & Neuroscience, King's College London, Box PO70, De Crespigny Park, Denmark Hill, London, SE5 8AF, UK
| | - Lilla Macsai
- Department of Psychiatry, Faculty of Medicine, University of Szeged, Kalvaria sgt. 57, Szeged, H-6725, Hungary
| | | | - Livia Fulop
- Department of Medical Chemistry, Faculty of Medicine, University of Szeged, Semmelweis u. 6, Szeged, H-6725, Hungary
| | - Zsolt Bozso
- Department of Medical Chemistry, Faculty of Medicine, University of Szeged, Semmelweis u. 6, Szeged, H-6725, Hungary
| | - Bence Galik
- Bioinformatics & Scientific Computing, Vienna Biocentre Core Facilities, Dr. Bohr-Gasse 3, 1030, Vienna, Austria
| | - Eva Acs
- Danube Research Institute, MTA Centre for Ecological Research, Karolina ut 29-31, Budapest, H-1113, Hungary
- Sustainable Ecosystems Group, MTA Centre for Ecological Research, Klebelsberg Kuno u. 3, Tihany, H-8237, Hungary
| | - Angela Foldi
- Sustainable Ecosystems Group, MTA Centre for Ecological Research, Klebelsberg Kuno u. 3, Tihany, H-8237, Hungary
| | - Amanda Szarvas
- Department of Psychiatry, Faculty of Medicine, University of Szeged, Kalvaria sgt. 57, Szeged, H-6725, Hungary
| | - Janos Kalman
- Department of Psychiatry, Faculty of Medicine, University of Szeged, Kalvaria sgt. 57, Szeged, H-6725, Hungary
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11
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Ochalek A, Mihalik B, Avci HX, Chandrasekaran A, Téglási A, Bock I, Giudice ML, Táncos Z, Molnár K, László L, Nielsen JE, Holst B, Freude K, Hyttel P, Kobolák J, Dinnyés A. Neurons derived from sporadic Alzheimer's disease iPSCs reveal elevated TAU hyperphosphorylation, increased amyloid levels, and GSK3B activation. ALZHEIMERS RESEARCH & THERAPY 2017; 9:90. [PMID: 29191219 PMCID: PMC5709977 DOI: 10.1186/s13195-017-0317-z] [Citation(s) in RCA: 136] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Accepted: 10/27/2017] [Indexed: 12/16/2022]
Abstract
BACKGROUND Alzheimer's disease (AD) is the most common type of dementia, affecting one in eight adults over 65 years of age. The majority of AD cases are sporadic, with unknown etiology, and only 5% of all patients with AD present the familial monogenic form of the disease. In the present study, our aim was to establish an in vitro cell model based on patient-specific human neurons to study the pathomechanism of sporadic AD. METHODS We compared neurons derived from induced pluripotent stem cell (iPSC) lines of patients with early-onset familial Alzheimer's disease (fAD), all caused by mutations in the PSEN1 gene; patients with late-onset sporadic Alzheimer's disease (sAD); and three control individuals without dementia. The iPSC lines were differentiated toward mature cortical neurons, and AD pathological hallmarks were analyzed by RT-qPCR, enzyme-linked immunosorbent assay, and Western blotting methods. RESULTS Neurons from patients with fAD and patients with sAD showed increased phosphorylation of TAU protein at all investigated phosphorylation sites. Relative to the control neurons, neurons derived from patients with fAD and patients with sAD exhibited higher levels of extracellular amyloid-β 1-40 (Aβ1-40) and amyloid-β 1-42 (Aβ1-42). However, significantly increased Aβ1-42/Aβ1-40 ratios, which is one of the pathological markers of fAD, were observed only in samples of patients with fAD. Additionally, we detected increased levels of active glycogen synthase kinase 3 β, a physiological kinase of TAU, in neurons derived from AD iPSCs, as well as significant upregulation of amyloid precursor protein (APP) synthesis and APP carboxy-terminal fragment cleavage. Moreover, elevated sensitivity to oxidative stress, as induced by amyloid oligomers or peroxide, was detected in both fAD- and sAD-derived neurons. CONCLUSIONS On the basis of the experiments we performed, we can conclude there is no evident difference except secreted Aβ1-40 levels in phenotype between fAD and sAD samples. To our knowledge, this is the first study in which the hyperphosphorylation of TAU protein has been compared in fAD and sAD iPSC-derived neurons. Our findings demonstrate that iPSC technology is suitable to model both fAD and sAD and may provide a platform for developing new treatment strategies for these conditions.
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Affiliation(s)
- Anna Ochalek
- Molecular Animal Biotechnology Laboratory, Szent István University, H-2100, Gödöllő, Hungary.,BioTalentum Ltd., Aulich Lajos Street 26, H-2100, Gödöllő, Hungary
| | - Balázs Mihalik
- BioTalentum Ltd., Aulich Lajos Street 26, H-2100, Gödöllő, Hungary
| | - Hasan X Avci
- BioTalentum Ltd., Aulich Lajos Street 26, H-2100, Gödöllő, Hungary.,Department of Anatomy, Embryology and Histology, Faculty of Medicine, University of Szeged, H-6700, Szeged, Hungary.,Present address: University Department of Otolaryngology, Head and Neck Surgery, University of Tübingen, 72076, Tübingen, Germany
| | | | | | - István Bock
- BioTalentum Ltd., Aulich Lajos Street 26, H-2100, Gödöllő, Hungary
| | - Maria Lo Giudice
- BioTalentum Ltd., Aulich Lajos Street 26, H-2100, Gödöllő, Hungary
| | - Zsuzsanna Táncos
- BioTalentum Ltd., Aulich Lajos Street 26, H-2100, Gödöllő, Hungary
| | - Kinga Molnár
- Department of Anatomy, Cell and Developmental Biology, Eötvös Loránd University, H-1117, Budapest, Hungary
| | - Lajos László
- Department of Anatomy, Cell and Developmental Biology, Eötvös Loránd University, H-1117, Budapest, Hungary
| | - Jørgen E Nielsen
- Neurogenetics Clinic & Research Laboratory, Danish Dementia Research Centre, Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | | | - Kristine Freude
- Department of Veterinary and Animal Sciences, University of Copenhagen, 1870, Copenhagen, Denmark
| | - Poul Hyttel
- Department of Veterinary and Animal Sciences, University of Copenhagen, 1870, Copenhagen, Denmark
| | - Julianna Kobolák
- BioTalentum Ltd., Aulich Lajos Street 26, H-2100, Gödöllő, Hungary
| | - András Dinnyés
- Molecular Animal Biotechnology Laboratory, Szent István University, H-2100, Gödöllő, Hungary. .,BioTalentum Ltd., Aulich Lajos Street 26, H-2100, Gödöllő, Hungary.
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12
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GABA A receptor subunit deregulation in the hippocampus of human foetuses with Down syndrome. Brain Struct Funct 2017; 223:1501-1518. [PMID: 29168008 PMCID: PMC5869939 DOI: 10.1007/s00429-017-1563-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Accepted: 11/05/2017] [Indexed: 11/01/2022]
Abstract
The function, regulation and cellular distribution of GABAA receptor subunits have been extensively documented in the adult rodent brain and are linked to numerous neurological disorders. However, there is a surprising lack of knowledge on the cellular (sub-) distribution of GABAA receptor subunits and of their expressional regulation in developing healthy and diseased foetal human brains. To propose a role for GABAA receptor subunits in neurodevelopmental disorders, we studied the developing hippocampus of normal and Down syndrome foetuses. Among the α1-3 and γ2 subunits probed, we find significantly altered expression profiles of the α1, α3 and γ2 subunits in developing Down syndrome hippocampi, with the α3 subunit being most affected. α3 subunits were selectively down-regulated in all hippocampal subfields and developmental periods tested in Down syndrome foetuses, presenting a developmental mismatch by their adult-like distribution in early foetal development. We hypothesized that increased levels of the amyloid precursor protein (APP), and particularly its neurotoxic β-amyloid (1-42) fragment, could disrupt α3 gene expression, likely by facilitating premature neuronal differentiation. Indeed, we find increased APP content in the hippocampi of the Down foetuses. In a corresponding cellular model, soluble β-amyloid (1-42) administered to cultured SH-SY5Y neuroblastoma cells, augmented by retinoic acid-induced differentiation towards a neuronal phenotype, displayed a reduction in α3 subunit levels. In sum, this study charts a comprehensive regional and subcellular map of key GABAA receptor subunits in identified neuronal populations in the hippocampus of healthy and Down syndrome foetuses and associates increased β-amyloid load with discordant down-regulation of α3 subunits.
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13
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Kasza Á, Penke B, Frank Z, Bozsó Z, Szegedi V, Hunya Á, Németh K, Kozma G, Fülöp L. Studies for Improving a Rat Model of Alzheimer's Disease: Icv Administration of Well-Characterized β-Amyloid 1-42 Oligomers Induce Dysfunction in Spatial Memory. Molecules 2017; 22:molecules22112007. [PMID: 29156571 PMCID: PMC6150403 DOI: 10.3390/molecules22112007] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Revised: 11/07/2017] [Accepted: 11/13/2017] [Indexed: 12/17/2022] Open
Abstract
During the past 15 years, several genetically altered mouse models of human Alzheimer’s disease (AD) have been developed. These costly models have greatly facilitated the evaluation of novel therapeutic approaches. Injecting synthetic β-amyloid (Aβ) 1-42 species into different parts of the brain of non-transgenic rodents frequently provided unreliable results, owing to a lack of a genuine characterization of the administered Aβ aggregates. Previously, we have published a new rat AD-model in which protofibrillar-fibrillar Aβ1-42 was administered into rat entorhinal cortex (Sipos 2007). In order to develop a more reliable model, we have injected well-characterized toxic soluble Aβ1-42 species (oligomers, protofibrils and fibrils) intracerebroventricularly (icv) into rat brain. Studies of the distribution of fluorescent-labeled Aβ1-42 in the brain showed that soluble Aβ-species diffused into all parts of the rat brain. After seven days, the Aβ-treated animals showed a significant decrease of spatial memory in Morris water maze test and impairment of synaptic plasticity (LTP) measured in acute hippocampal slices. The results of histological studies (decreased number of viable neurons, increased tau levels and decreased number of dendritic spines) also supported that icv administration of well-characterized toxic soluble Aβ species into rat brain provides a reliable rat AD-model.
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Affiliation(s)
- Ágnes Kasza
- Department of Medical Chemistry, University of Szeged, Dome square 8, Szeged H-6720, Hungary.
| | - Botond Penke
- Department of Medical Chemistry, University of Szeged, Dome square 8, Szeged H-6720, Hungary.
| | - Zsuzsanna Frank
- Department of Medical Chemistry, University of Szeged, Dome square 8, Szeged H-6720, Hungary.
| | - Zsolt Bozsó
- Department of Medical Chemistry, University of Szeged, Dome square 8, Szeged H-6720, Hungary.
| | - Viktor Szegedi
- Department of Medical Chemistry, University of Szeged, Dome square 8, Szeged H-6720, Hungary.
| | - Ákos Hunya
- LipidArt Research and Development Ltd., Temesvári krt. 62, Szeged H-6726, Hungary.
| | - Klaudia Németh
- Department of Medical Chemistry, University of Szeged, Dome square 8, Szeged H-6720, Hungary.
| | - Gábor Kozma
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla square 1, Szeged H-6720, Hungary.
| | - Lívia Fülöp
- Department of Medical Chemistry, University of Szeged, Dome square 8, Szeged H-6720, Hungary.
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14
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15
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Kalweit AN, Yang H, Colitti-Klausnitzer J, Fülöp L, Bozsó Z, Penke B, Manahan-Vaughan D. Acute intracerebral treatment with amyloid-beta (1-42) alters the profile of neuronal oscillations that accompany LTP induction and results in impaired LTP in freely behaving rats. Front Behav Neurosci 2015; 9:103. [PMID: 25999827 PMCID: PMC4422036 DOI: 10.3389/fnbeh.2015.00103] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Accepted: 04/07/2015] [Indexed: 11/30/2022] Open
Abstract
Accumulation of amyloid plaques comprises one of the major hallmarks of Alzheimer’s disease (AD). In rodents, acute treatment with amyloid-beta (Aβ; 1–42) elicits immediate debilitating effects on hippocampal long-term potentiation (LTP). Whereas LTP contributes to synaptic information storage, information is transferred across neurons by means of neuronal oscillations. Furthermore, changes in theta-gamma oscillations, that appear during high-frequency stimulation (HFS) to induce LTP, predict whether successful LTP will occur. Here, we explored if intra-cerebral treatment with Aβ(1–42), that prevents LTP, also results in alterations of hippocampal oscillations that occur during HFS of the perforant path-dentate gyrus synapse in 6-month-old behaving rats. HFS resulted in LTP that lasted for over 24 h. In Aβ-treated animals, LTP was significantly prevented. During HFS, spectral power for oscillations below 100 Hz (δ, θ, α, β and γ) was significantly higher in Aβ-treated animals compared to controls. In addition, the trough-to-peak amplitudes of theta and gamma cycles were higher during HFS in Aβ-treated animals. We also observed a lower amount of envelope-to-signal correlations during HFS in Aβ-treated animals. Overall, the characteristic profile of theta-gamma oscillations that accompany successful LTP induction was disrupted. These data indicate that alterations in network oscillations accompany Aβ-effects on hippocampal LTP. This may comprise an underlying mechanism through which disturbances in synaptic information storage and hippocampus-dependent memory occurs in AD.
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Affiliation(s)
- Alexander Nikolai Kalweit
- Medical Faculty, Department of Neurophysiology, Ruhr University Bochum Bochum, Germany ; International Graduate School of Neuroscience, Ruhr University Bochum Bochum, Germany
| | - Honghong Yang
- Medical Faculty, Department of Neurophysiology, Ruhr University Bochum Bochum, Germany ; International Graduate School of Neuroscience, Ruhr University Bochum Bochum, Germany
| | | | - Livia Fülöp
- Department of Medical Chemistry, University of Szeged Szeged, Hungary
| | - Zsolt Bozsó
- Department of Medical Chemistry, University of Szeged Szeged, Hungary
| | - Botond Penke
- Department of Medical Chemistry, University of Szeged Szeged, Hungary
| | - Denise Manahan-Vaughan
- Medical Faculty, Department of Neurophysiology, Ruhr University Bochum Bochum, Germany ; International Graduate School of Neuroscience, Ruhr University Bochum Bochum, Germany
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16
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Ansciaux E, Burtea C, Laurent S, Crombez D, Nonclercq D, Vander Elst L, Muller RN. In vitro and in vivo characterization of several functionalized ultrasmall particles of iron oxide, vectorized against amyloid plaques and potentially able to cross the blood-brain barrier: toward earlier diagnosis of Alzheimer's disease by molecular imag. CONTRAST MEDIA & MOLECULAR IMAGING 2014; 10:211-24. [DOI: 10.1002/cmmi.1626] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2014] [Revised: 07/13/2014] [Accepted: 08/25/2014] [Indexed: 11/06/2022]
Affiliation(s)
- Emilie Ansciaux
- Department of General, Organic and Biomedical Chemistry, NMR and Molecular Imaging Laboratory; University of Mons; Avenue Maistriau 19, Mendeleev Building B-7000 Mons Belgium
| | - Carmen Burtea
- Department of General, Organic and Biomedical Chemistry, NMR and Molecular Imaging Laboratory; University of Mons; Avenue Maistriau 19, Mendeleev Building B-7000 Mons Belgium
| | - Sophie Laurent
- Department of General, Organic and Biomedical Chemistry, NMR and Molecular Imaging Laboratory; University of Mons; Avenue Maistriau 19, Mendeleev Building B-7000 Mons Belgium
| | - Deborah Crombez
- Department of General, Organic and Biomedical Chemistry, NMR and Molecular Imaging Laboratory; University of Mons; Avenue Maistriau 19, Mendeleev Building B-7000 Mons Belgium
| | - Denis Nonclercq
- Laboratory of Histology; University of Mons; Pentagon - 1B, 6 Avenue du Champ de Mars B-7000 Mons Belgium
| | - Luce Vander Elst
- Department of General, Organic and Biomedical Chemistry, NMR and Molecular Imaging Laboratory; University of Mons; Avenue Maistriau 19, Mendeleev Building B-7000 Mons Belgium
| | - Robert N. Muller
- Department of General, Organic and Biomedical Chemistry, NMR and Molecular Imaging Laboratory; University of Mons; Avenue Maistriau 19, Mendeleev Building B-7000 Mons Belgium
- Center for Microscopy and Molecular Imaging; 8, rue Adrienne Bolland 6041 Gosselies Belgium
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17
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Abeta(1-42) enhances neuronal excitability in the CA1 via NR2B subunit-containing NMDA receptors. Neural Plast 2014; 2014:584314. [PMID: 25276438 PMCID: PMC4168240 DOI: 10.1155/2014/584314] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Revised: 08/05/2014] [Accepted: 08/17/2014] [Indexed: 11/25/2022] Open
Abstract
Neuronal hyperexcitability is a phenomenon associated with early Alzheimer's disease. The underlying mechanism is considered to involve excessive activation of glutamate receptors; however, the exact molecular pathway remains to be determined. Extracellular recording from the CA1 of hippocampal slices is a long-standing standard for a range of studies both in basic research and in neuropharmacology. Evoked field potentials (fEPSPs) are regarded as the input, while spiking rate is regarded as the output of the neuronal network; however, the relationship between these two phenomena is not fully clear. We investigated the relationship between spontaneous spiking and evoked fEPSPs using mouse hippocampal slices. Blocking AMPA receptors (AMPARs) with CNQX abolished fEPSPs, but left firing rate unchanged. NMDA receptor (NMDAR) blockade with MK801 decreased neuronal spiking dose dependently without altering fEPSPs. Activating NMDARs by small concentration of NMDA induced a trend of increased firing. These results suggest that fEPSPs are mediated by synaptic activation of AMPARs, while spontaneous firing is regulated by the activation of extrasynaptic NMDARs. Synaptotoxic Abeta(1-42) increased firing activity without modifying evoked fEPSPs. This hyperexcitation was prevented by ifenprodil, an antagonist of the NR2B NMDARs. Overall, these results suggest that Abeta(1-42) induced neuronal overactivity is not dependent on AMPARs but requires NR2B.
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Yoshiya T, Maruno T, Uemura T, Kubo S, Kiso Y, Sohma Y, Yoshizawa-Kumagaye K, Kobayashi Y, Nishiuchi Y. Non-pretreated O-acyl isopeptide of amyloid β peptide 1-42 is monomeric with a random coil structure but starts to aggregate in a concentration-dependent manner. Bioorg Med Chem Lett 2014; 24:3861-4. [PMID: 25017031 DOI: 10.1016/j.bmcl.2014.06.052] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Revised: 06/17/2014] [Accepted: 06/19/2014] [Indexed: 11/25/2022]
Abstract
An isopeptide of amyloid β peptide 1-42 (isoAβ42) was considered as a non-aggregative precursor molecule for the highly aggregative Aβ42. It has been applied to biological studies after several pretreatments. Here we report that isoAβ42 is monomeric with a random coil structure at 40 μM without any pretreatment. But we also found that isoAβ42 retains a slight aggregative nature, which is significantly weaker than that of the native Aβ42.
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Affiliation(s)
- Taku Yoshiya
- Peptide Institute, Inc., 7-2-9 Saito-Asagi, Ibaraki-Shi, Osaka 567-0085, Japan.
| | - Takahiro Maruno
- Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan
| | - Tsuyoshi Uemura
- Peptide Institute, Inc., 7-2-9 Saito-Asagi, Ibaraki-Shi, Osaka 567-0085, Japan
| | - Shigeru Kubo
- Peptide Institute, Inc., 7-2-9 Saito-Asagi, Ibaraki-Shi, Osaka 567-0085, Japan
| | - Yoshiaki Kiso
- Laboratory of Peptide Science, Nagahama Institute of Bio-Science and Technology, Shiga 526-0829, Japan
| | - Youhei Sohma
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo 113-0033, Japan
| | | | - Yuji Kobayashi
- Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan
| | - Yuji Nishiuchi
- Peptide Institute, Inc., 7-2-9 Saito-Asagi, Ibaraki-Shi, Osaka 567-0085, Japan; Graduate School of Science, Osaka University, Osaka 560-0043, Japan
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19
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Simultaneous changes of spatial memory and spine density after intrahippocampal administration of fibrillar aβ1-42 to the rat brain. BIOMED RESEARCH INTERNATIONAL 2014; 2014:345305. [PMID: 25050342 PMCID: PMC4094878 DOI: 10.1155/2014/345305] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/16/2014] [Revised: 05/25/2014] [Accepted: 06/02/2014] [Indexed: 01/29/2023]
Abstract
Several animal models of Alzheimer's disease have been used in laboratory experiments. Intrahippocampal injection of fibrillar amyloid-beta (fAβ) peptide represents one of the most frequently used models, mimicking Aβ deposits in the brain. In our experiment synthetic fAβ1–42 peptide was administered to rat hippocampus. The effect of the Aβ peptide on spatial memory and dendritic spine density was studied. The fAβ1–42-treated rats showed decreased spatial learning ability measured in Morris water maze (MWM). Simultaneously, fAβ1–42 caused a significant reduction of the dendritic spine density in the rat hippocampus CA1 region. The decrease of learning ability and the loss of spine density were in good correlation. Our results prove that both methods (MWM and dendritic spine density measurement) are suitable for studying Aβ-triggered neurodegeneration processes.
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20
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Yoshiya T, Uemura T, Maruno T, Kubo S, Kiso Y, Sohma Y, Kobayashi Y, Yoshizawa-Kumagaye K, Nishiuchi Y. O
-Acyl isopeptide method: development of an O
-acyl isodipeptide unit for Boc SPPS
and its application to the synthesis of Aβ
1-42 isopeptide. J Pept Sci 2014; 20:669-74. [DOI: 10.1002/psc.2662] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Revised: 05/09/2014] [Accepted: 05/09/2014] [Indexed: 01/21/2023]
Affiliation(s)
| | | | - Takahiro Maruno
- Graduate School of Engineering; Osaka University; Osaka 565-0871 Japan
| | | | - Yoshiaki Kiso
- Laboratory of Peptide Science; Nagahama Institute of Bio-Science and Technology; Shiga 526-0829 Japan
| | - Youhei Sohma
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; Tokyo 113-0033 Japan
| | - Yuji Kobayashi
- Graduate School of Engineering; Osaka University; Osaka 565-0871 Japan
| | | | - Yuji Nishiuchi
- Peptide Institute, Inc.; Osaka 567-0085 Japan
- Graduate School of Science; Osaka University; Osaka 560-0043 Japan
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21
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Tóth ME, Szegedi V, Varga E, Juhász G, Horváth J, Borbély E, Csibrány B, Alföldi R, Lénárt N, Penke B, Sántha M. Overexpression of Hsp27 ameliorates symptoms of Alzheimer's disease in APP/PS1 mice. Cell Stress Chaperones 2013; 18:759-71. [PMID: 23605646 PMCID: PMC3789881 DOI: 10.1007/s12192-013-0428-9] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Revised: 04/03/2013] [Accepted: 04/04/2013] [Indexed: 01/16/2023] Open
Abstract
Hsp27 belongs to the small heat shock protein family, which are ATP-independent chaperones. The most important function of Hsp27 is based on its ability to bind non-native proteins and inhibit the aggregation of incorrectly folded proteins maintaining them in a refolding-competent state. Additionally, it has anti-apoptotic and antioxidant activities. To study the effect of Hsp27 on memory and synaptic functions, amyloid-β (Aβ) accumulation, and neurodegeneration, we generated transgenic mice overexpressing human Hsp27 protein and crossed with APPswe/PS1dE9 mouse strain, a mouse model of Alzheimer's disease (AD). Using different behavioral tests, we found that spatial learning was impaired in AD model mice and was rescued by Hsp27 overexpression. Electrophysiological recordings have revealed that excitability of neurons was significantly increased, and long-term potentiation (LTP) was impaired in AD model mice, whereas they were normalized in Hsp27 overexpressing AD model mice. Using anti-amyloid antibody, we counted significantly less amyloid plaques in the brain of APPswe/PS1dE9/Hsp27 animals compared to AD model mice. These results suggest that overexpression of Hsp27 protein might ameliorate certain symptoms of AD.
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Affiliation(s)
- Melinda Erzsébet Tóth
- Institute of Biochemistry, Biological Research Centre of the Hungarian Academy of Sciences, Temesvari Ave. 62, 6726, Szeged, Hungary,
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22
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Abstract
O-Acyl isopeptides, in which the N-acyl linkage on the hydroxyamino acid residue (e.g., Ser and Thr) is replaced with an O-acyl linkage, generally possess superior water-solubility to their corresponding native peptides, as well as other distinct physicochemical properties. In addition, O-acyl isopeptides can be rapidly converted into their corresponding native peptide under neutral aqueous conditions through an O-to-N acyl migration. By exploiting these characteristics, researchers have applied the O-acyl isopeptide method to various peptide-synthesis fields, such as the synthesis of aggregative peptides and convergent peptide synthesis. This O-acyl-isopeptide approach also serves as a means to control the biological function of the peptide in question. Herein, we report the synthesis of O-acyl isopeptides and some of their applications.
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Affiliation(s)
- Youhei Sohma
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1, Hongo, Tokyo 113-0033, Japan.
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23
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Hoppmann C, Barucker C, Lorenz D, Multhaup G, Beyermann M. Light-Controlled Toxicity of Engineered Amyloid β-Peptides. Chembiochem 2012; 13:2657-60. [DOI: 10.1002/cbic.201200605] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2012] [Indexed: 11/11/2022]
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24
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Fülöp L, Mándity IM, Juhász G, Szegedi V, Hetényi A, Wéber E, Bozsó Z, Simon D, Benkő M, Király Z, Martinek TA. A foldamer-dendrimer conjugate neutralizes synaptotoxic β-amyloid oligomers. PLoS One 2012; 7:e39485. [PMID: 22859942 PMCID: PMC3408453 DOI: 10.1371/journal.pone.0039485] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2012] [Accepted: 05/21/2012] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND AND AIMS Unnatural self-organizing biomimetic polymers (foldamers) emerged as promising materials for biomolecule recognition and inhibition. Our goal was to construct multivalent foldamer-dendrimer conjugates which wrap the synaptotoxic β-amyloid (Aβ) oligomers with high affinity through their helical foldamer tentacles. Oligomeric Aβ species play pivotal role in Alzheimer's disease, therefore recognition and direct inhibition of this undruggable target is a great current challenge. METHODS AND RESULTS Short helical β-peptide foldamers with designed secondary structures and side chain chemistry patterns were applied as potential recognition segments and their binding to the target was tested with NMR methods (saturation transfer difference and transferred-nuclear Overhauser effect). Helices exhibiting binding in the µM region were coupled to a tetravalent G0-PAMAM dendrimer. In vitro biophysical (isothermal titration calorimetry, dynamic light scattering, transmission electron microscopy and size-exclusion chromatography) and biochemical tests (ELISA and dot blot) indicated the tight binding between the foldamer conjugates and the Aβ oligomers. Moreover, a selective low nM interaction with the low molecular weight fraction of the Aβ oligomers was found. Ex vivo electrophysiological experiments revealed that the new material rescues the long-term potentiation from the toxic Aβ oligomers in mouse hippocampal slices at submicromolar concentration. CONCLUSIONS The combination of the foldamer methodology, the fragment-based approach and the multivalent design offers a pathway to unnatural protein mimetics that are capable of specific molecular recognition, and has already resulted in an inhibitor for an extremely difficult target.
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Affiliation(s)
- Lívia Fülöp
- Department of Medical Chemistry, University of Szeged, Szeged, Hungary
| | - István M. Mándity
- Institute of Pharmaceutical Chemistry, University of Szeged, Szeged, Hungary
| | - Gábor Juhász
- Department of Medical Chemistry, University of Szeged, Szeged, Hungary
| | - Viktor Szegedi
- Bay Zoltán Foundation for Applied Research – BAYGEN, Szeged, Hungary
| | | | - Edit Wéber
- Institute of Pharmaceutical Chemistry, University of Szeged, Szeged, Hungary
| | - Zsolt Bozsó
- Department of Medical Chemistry, University of Szeged, Szeged, Hungary
| | - Dóra Simon
- Department of Medical Chemistry, University of Szeged, Szeged, Hungary
| | - Mária Benkő
- Department of Physical Chemistry and Materials Science, University of Szeged, Szeged, Hungary
| | - Zoltán Király
- Department of Physical Chemistry and Materials Science, University of Szeged, Szeged, Hungary
| | - Tamás A. Martinek
- Institute of Pharmaceutical Chemistry, University of Szeged, Szeged, Hungary
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25
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Alzheimer's disease Aβ assemblies mediating rapid disruption of synaptic plasticity and memory. Mol Brain 2012; 5:25. [PMID: 22805374 PMCID: PMC3502131 DOI: 10.1186/1756-6606-5-25] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2012] [Accepted: 06/22/2012] [Indexed: 01/24/2023] Open
Abstract
Alzheimer’s disease (AD) is characterized by episodic memory impairment that often precedes clinical diagnosis by many years. Probing the mechanisms of such impairment may provide much needed means of diagnosis and therapeutic intervention at an early, pre-dementia, stage. Prior to the onset of significant neurodegeneration, the structural and functional integrity of synapses in mnemonic circuitry is severely compromised in the presence of amyloidosis. This review examines recent evidence evaluating the role of amyloid-ß protein (Aβ) in causing rapid disruption of synaptic plasticity and memory impairment. We evaluate the relative importance of different sizes and conformations of Aβ, including monomer, oligomer, protofibril and fibril. We pay particular attention to recent controversies over the relevance to the pathophysiology of AD of different water soluble Aβ aggregates and the importance of cellular prion protein in mediating their effects. Current data are consistent with the view that both low-n oligomers and larger soluble assemblies present in AD brain, some of them via a direct interaction with cellular prion protein, cause synaptic memory failure. At the two extremes of aggregation, monomers and fibrils appear to act in vivo both as sources and sinks of certain metastable conformations of soluble aggregates that powerfully disrupt synaptic plasticity. The same principle appears to apply to other synaptotoxic amyloidogenic proteins including tau, α-synuclein and prion protein.
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26
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A novel method for the rapid determination of beta-amyloid toxicity on acute hippocampal slices using MTT and LDH assays. Brain Res Bull 2012; 87:521-5. [DOI: 10.1016/j.brainresbull.2012.02.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2011] [Revised: 02/06/2012] [Accepted: 02/07/2012] [Indexed: 01/31/2023]
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27
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Butterfield S, Hejjaoui M, Fauvet B, Awad L, Lashuel HA. Chemical strategies for controlling protein folding and elucidating the molecular mechanisms of amyloid formation and toxicity. J Mol Biol 2012; 421:204-36. [PMID: 22342932 DOI: 10.1016/j.jmb.2012.01.051] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2011] [Revised: 01/30/2012] [Accepted: 01/31/2012] [Indexed: 12/12/2022]
Abstract
It has been more than a century since the first evidence linking the process of amyloid formation to the pathogenesis of Alzheimer's disease. During the last three decades in particular, increasing evidence from various sources (pathology, genetics, cell culture studies, biochemistry, and biophysics) continues to point to a central role for the pathogenesis of several incurable neurodegenerative and systemic diseases. This is in part driven by our improved understanding of the molecular mechanisms of protein misfolding and aggregation and the structural properties of the different aggregates in the amyloid pathway and the emergence of new tools and experimental approaches that permit better characterization of amyloid formation in vivo. Despite these advances, detailed mechanistic understanding of protein aggregation and amyloid formation in vitro and in vivo presents several challenges that remain to be addressed and several fundamental questions about the molecular and structural determinants of amyloid formation and toxicity and the mechanisms of amyloid-induced toxicity remain unanswered. To address this knowledge gap and technical challenges, there is a critical need for developing novel tools and experimental approaches that will not only permit the detection and monitoring of molecular events that underlie this process but also allow for the manipulation of these events in a spatial and temporal fashion both in and out of the cell. This review is primarily dedicated in highlighting recent results that illustrate how advances in chemistry and chemical biology have been and can be used to address some of the questions and technical challenges mentioned above. We believe that combining recent advances in the development of new fluorescent probes, imaging tools that enabled the visualization and tracking of molecular events with advances in organic synthesis, and novel approaches for protein synthesis and engineering provide unique opportunities to gain a molecular-level understanding of the process of amyloid formation. We hope that this review will stimulate further research in this area and catalyze increased collaboration at the interface of chemistry and biology to decipher the mechanisms and roles of protein folding, misfolding, and aggregation in health and disease.
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Affiliation(s)
- Sara Butterfield
- Laboratory of Molecular and Chemical Biology of Neurodegeneration, Brain Mind Institute, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
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Monbaliu JCM, Katritzky AR. Recent trends in Cys- and Ser/Thr-based synthetic strategies for the elaboration of peptide constructs. Chem Commun (Camb) 2012; 48:11601-22. [DOI: 10.1039/c2cc34434c] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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29
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Oláh J, Vincze O, Virók D, Simon D, Bozsó Z, Tõkési N, Horváth I, Hlavanda E, Kovács J, Magyar A, Szũcs M, Orosz F, Penke B, Ovádi J. Interactions of pathological hallmark proteins: tubulin polymerization promoting protein/p25, beta-amyloid, and alpha-synuclein. J Biol Chem 2011; 286:34088-100. [PMID: 21832049 DOI: 10.1074/jbc.m111.243907] [Citation(s) in RCA: 109] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The disordered tubulin polymerization promoting protein (TPPP/p25) was found to be co-enriched in neuronal and glial inclusions with α-synuclein in Parkinson disease and multiple system atrophy, respectively; however, co-occurrence of α-synuclein with β-amyloid (Aβ) in human brain inclusions has been recently reported, suggesting the existence of mixed type pathologies that could result in obstacles in the correct diagnosis and treatment. Here we identified TPPP/p25 as an interacting partner of the soluble Aβ oligomers as major risk factors for Alzheimer disease using ProtoArray human protein microarray. The interactions of oligomeric Aβ with proteins involved in the etiology of neurological disorders were characterized by ELISA, surface plasmon resonance, pelleting experiments, and tubulin polymerization assay. We showed that the Aβ(42) tightly bound to TPPP/p25 (K(d) = 85 nm) and caused aberrant protein aggregation by inhibiting the physiologically relevant TPPP/p25-derived microtubule assembly. The pair-wise interactions of Aβ(42), α-synuclein, and tubulin were found to be relatively weak; however, these three components formed soluble ternary complex exclusively in the absence of TPPP/p25. The aggregation-facilitating activity of TPPP/p25 and its interaction with Aβ was monitored by electron microscopy with purified proteins by pelleting experiments with cell-free extracts as well as by confocal microscopy with CHO cells expressing TPPP/p25 or amyloid. The finding that the interaction of TPPP/p25 with Aβ can produce pathological-like aggregates is tightly coupled with unusual pathology of the Alzheimer disease revealed previously; that is, partial co-localization of Aβ and TPPP/p25 in the case of diffuse Lewy body disease with Alzheimer disease.
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Affiliation(s)
- Judit Oláh
- Institute of Enzymology, Biological Research Center, Hungarian Academy of Sciences, H-1113 Budapest, Hungary
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30
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Self-assembly pathways of E22Δ-type amyloid β peptide mutants generated from non-aggregative O-acyl isopeptide precursors. Bioorg Med Chem 2011; 19:3787-92. [PMID: 21612934 DOI: 10.1016/j.bmc.2011.04.056] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2011] [Revised: 04/28/2011] [Accepted: 04/29/2011] [Indexed: 11/24/2022]
Abstract
The recently identified E22Δ-type amyloid β peptide (Aβ) mutants are reported to favor oligomerization over fibrillization and to exhibit more-potent synaptotoxicity than does wild-type (WT) Aβ. Aβ(E22Δ) mutants can thus be expected to serve as tools for clarifying the impact of Aβ oligomers in Alzheimer's disease (or Alzheimer's-type dementia). However, the biochemical and biophysical properties of Aβ(E22Δ) have not been conclusively determined. Here, we evaluated the self-assembly pathways of Aβ(E22Δ) mutants generated from water-soluble, non-aggregative O-acyl isopeptide precursors. Circular dichroism spectroscopy, Western blot analysis, and thioflavin-T fluorescence intensity and cellular toxicity assays suggest that the self-assembly pathways of Aβ(E22Δ) differed from those of Aβ(WT). Aβ1-40(E22Δ) underwent a rapid random coil→β-sheet conformational change in its monomeric or low-molecular-weight oligomeric states, whereas Aβ1-40(WT) self-assembled gradually without losing its propensity to form random coil structures. The Aβ1-42(E22Δ) monomer formed β-sheet-rich oligomers more rapidly than did Aβ1-42(WT). Additionally, the Aβ1-42(E22Δ) oligomers appear to differ from Aβ1-42(WT) oligomers in size, shape, or both. These results should provide new insights into the functions of Aβ(E22Δ) mutants.
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31
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Yoshiya T, Higa A, Abe N, Fukao F, Kuruma T, Toda Y, Sohma Y, Kiso Y. Click Peptide concept: o-acyl isopeptide of islet amyloid polypeptide as a nonaggregative precursor molecule. Chembiochem 2011; 12:1216-22. [PMID: 21538760 DOI: 10.1002/cbic.201100025] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2011] [Indexed: 12/24/2022]
Abstract
The O-acyl isopeptide (1) of islet amyloid polypeptide (IAPP), which contains an ester moiety at both Ala8-Thr9 and Ser19-Ser20, was prepared by sequential segment condensation based on the O-acyl isopeptide method. Isopeptide 1 possessed nonaggregative properties, retaining its random coil structure under the acidic conditions; this suggests that the insertion of the O-acyl isopeptide structures in IAPP suppressed aggregation of the molecule. As a result of the rapid O-to-N acyl shift of 1 under neutral pH, in situ-formed IAPP adopted a random-coil structure at the start of the experiment, and then underwent conformational change to α-helix/β-sheet mixed structures as well as aggregation. The click peptide strategy with the nonaggregative precursor molecule 1 could be a useful experimental tool to identify the functions of IAPP, by overcoming the handling difficulties that arise from IAPP's intense and uncontrollable self-assembling nature.
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Affiliation(s)
- Taku Yoshiya
- Kyoto Pharmaceutical University, Department of Medicinal Chemistry, Center for Frontier Research in Medicinal Science, Yamashina-ku, Kyoto, Japan
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Földi I, Datki ZL, Szabó Z, Bozsó Z, Penke B, Janáky T. Proteomic study of the toxic effect of oligomeric Aβ1-42 in situ prepared from 'iso-Aβ1-42'. J Neurochem 2011; 117:691-702. [PMID: 21388376 DOI: 10.1111/j.1471-4159.2011.07238.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Alzheimer's disease (AD) is the most prevalent form of neurodegenerative disorders even so the exact pathomechanism is still unclear. Recently, it is widely accepted that amyloid-beta peptide (Aβ) toxicity is positively linked to Aβ oligomers, which may be responsible for the initiation of AD. For this reason, AD research requires well defined aggregation state and structure of Aβ. Precursor peptide 'iso-Aβ1-42' makes it possible to use Aβ1-42 with well- defined aggregation state for in vitro and in vivo experiments. The aim of this study was to identify protein expression changes from differentiated SH-SY5Y neuroblastoma cells after treatment with oligomeric Aβ1-42 prepared in situ from 'iso-Aβ1-42'. In our experiment, a cell viability assay revealed a strong and time-dependent toxic effect of oligomeric Aβ1-42 which was supported by dramatic morphological changes. Our proteomics study also revealed numerous significant protein expression changes (22 proteins down- and 25 proteins up-regulated) after comparison of the untreated and Aβ1-42-treated cell lysates by two-dimensional electrophoresis. From the functional classification of the identified proteins, we found deregulations of proteins involved in metabolic processes, cytoskeleton organisation and protein biosynthesis and a huge number of up-regulated stress proteins displayed oligomeric Aβ1-42-induced cell stress.
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Affiliation(s)
- István Földi
- Department of Medical Chemistry, University of Szeged, Szeged, Hungary.
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33
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Yoshiya T, Hasegawa Y, Kawamura W, Kawashima H, Sohma Y, Kimura T, Kiso Y. S-acyl isopeptide method: Use of allyl-type protective group for improved preparation of thioester-containing S-acyl isopeptides by Fmoc-based SPPS. Biopolymers 2011; 96:228-39. [DOI: 10.1002/bip.21410] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Sohma Y, Hirayama Y, Taniguchi A, Mukai H, Kiso Y. ‘Click peptide’ using production of monomer Aβ from the O-acyl isopeptide: Application to assay system of aggregation inhibitors and cellular cytotoxicity. Bioorg Med Chem 2011; 19:1729-33. [DOI: 10.1016/j.bmc.2011.01.021] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2010] [Revised: 01/11/2011] [Accepted: 01/12/2011] [Indexed: 11/16/2022]
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35
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Yoshiya T, Kawashima H, Hasegawa Y, Okamoto K, Kimura T, Sohma Y, Kiso Y. Epimerization-free synthesis of cyclic peptide by use of the O-acyl isopeptide method. J Pept Sci 2010; 16:437-42. [PMID: 20623499 DOI: 10.1002/psc.1261] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
A head-to-tail cyclization of a protected linear hexapeptide with a C-terminal O-acyl isopeptide proceeded to give a cyclic O-acyl isopeptide without epimerization. The cyclic O-acyl isopeptide possessed different secondary structures compared with the native cyclic peptide. The isopeptide was then efficiently converted to the desired cyclic peptide via an O-to-N acyl migration reaction using a silica gel-anchored base.
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Affiliation(s)
- Taku Yoshiya
- Department of Medicinal Chemistry, Center for Frontier Research in Medicinal Science, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8412, Japan
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