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Fujino Y, Ueyama M, Ishiguro T, Ozawa D, Ito H, Sugiki T, Murata A, Ishiguro A, Gendron T, Mori K, Tokuda E, Taminato T, Konno T, Koyama A, Kawabe Y, Takeuchi T, Furukawa Y, Fujiwara T, Ikeda M, Mizuno T, Mochizuki H, Mizusawa H, Wada K, Ishikawa K, Onodera O, Nakatani K, Petrucelli L, Taguchi H, Nagai Y. FUS regulates RAN translation through modulating the G-quadruplex structure of GGGGCC repeat RNA in C9orf72-linked ALS/FTD. eLife 2023; 12:RP84338. [PMID: 37461319 PMCID: PMC10393046 DOI: 10.7554/elife.84338] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/20/2023] Open
Abstract
Abnormal expansions of GGGGCC repeat sequence in the noncoding region of the C9orf72 gene is the most common cause of familial amyotrophic lateral sclerosis and frontotemporal dementia (C9-ALS/FTD). The expanded repeat sequence is translated into dipeptide repeat proteins (DPRs) by noncanonical repeat-associated non-AUG (RAN) translation. Since DPRs play central roles in the pathogenesis of C9-ALS/FTD, we here investigate the regulatory mechanisms of RAN translation, focusing on the effects of RNA-binding proteins (RBPs) targeting GGGGCC repeat RNAs. Using C9-ALS/FTD model flies, we demonstrated that the ALS/FTD-linked RBP FUS suppresses RAN translation and neurodegeneration in an RNA-binding activity-dependent manner. Moreover, we found that FUS directly binds to and modulates the G-quadruplex structure of GGGGCC repeat RNA as an RNA chaperone, resulting in the suppression of RAN translation in vitro. These results reveal a previously unrecognized regulatory mechanism of RAN translation by G-quadruplex-targeting RBPs, providing therapeutic insights for C9-ALS/FTD and other repeat expansion diseases.
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Grants
- Scientific Research on Innovative Areas (Brain Protein Aging and Dementia Control) 17H05699 Ministry of Education, Culture, Sports, Science and Technology
- Scientific Research on Innovative Areas (Brain Protein Aging and Dementia Control) 17H05705 Ministry of Education, Culture, Sports, Science and Technology
- Transformative Research Areas (A) (Multifaceted Proteins) 20H05927 Ministry of Education, Culture, Sports, Science and Technology
- Strategic Research Program for Brain Sciences 11013026 Ministry of Education, Culture, Sports, Science and Technology
- Scientific Research (B) 21H02840 Japan Society for the Promotion of Science
- Scientific Research (B) 20H03602 Japan Society for the Promotion of Science
- Scientific Research (C) 15K09331 Japan Society for the Promotion of Science
- Scientific Research (C) 19K07823 Japan Society for the Promotion of Science
- Scientific Research (C) 17K07291 Japan Society for the Promotion of Science
- Young Scientists (A) 17H05091 Japan Society for the Promotion of Science
- Young Scientists (B) 25860733 Japan Society for the Promotion of Science
- Challenging Exploratory Research 24659438 Japan Society for the Promotion of Science
- Challenging Exploratory Research 18K19515 Japan Society for the Promotion of Science
- Health Labor Sciences Research Grant for Research on Development of New Drugs H24-Soyaku-Sogo-002 Ministry of Health, Labor and Welfare, Japan
- Strategic Research Program for Brain Sciences JP15dm0107026 Japan Agency for Medical Research and Development
- Strategic Research Program for Brain Sciences JP20dm0107061 Japan Agency for Medical Research and Development
- Practical Research Projects for Rare/Intractable Diseases JP16ek0109018 Japan Agency for Medical Research and Development
- Practical Research Projects for Rare/Intractable Diseases JP19ek0109222 Japan Agency for Medical Research and Development
- Practical Research Projects for Rare/Intractable Diseases JP20ek0109316 Japan Agency for Medical Research and Development
- Platform Project for Supporting Drug Discovery and Life Science Research JP19am0101072 Japan Agency for Medical Research and Development
- Intramural Research Grants for Neurological and Psychiatric Disorders 27-7 National Center of Neurology and Psychiatry
- Intramural Research Grants for Neurological and Psychiatric Disorders 27-9 National Center of Neurology and Psychiatry
- Intramural Research Grants for Neurological and Psychiatric Disorders 30-3 National Center of Neurology and Psychiatry
- Intramural Research Grants for Neurological and Psychiatric Disorders 30-9 National Center of Neurology and Psychiatry
- Intramural Research Grants for Neurological and Psychiatric Disorders 3-9 National Center of Neurology and Psychiatry
- IBC Grant H28 Japan Amyotrophic Lateral Sclerosis Association
- 2017 Takeda Science Foundation
- 2016 Takeda Science Foundation
- 2018 SENSHIN Medical Research Foundation
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Affiliation(s)
- Yuzo Fujino
- Department of Neurology, Kindai University Faculty of Medicine, Osaka-Sayama, Japan
- Department of Neurology, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Morio Ueyama
- Department of Neurology, Kindai University Faculty of Medicine, Osaka-Sayama, Japan
- Department of Neurotherapeutics, Osaka University Graduate School of Medicine, Suita, Japan
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Taro Ishiguro
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan
- Department of Neurology and Neurological Science, Tokyo Medical and Dental University, Tokyo, Japan
| | - Daisaku Ozawa
- Department of Neurology, Kindai University Faculty of Medicine, Osaka-Sayama, Japan
- Department of Neurotherapeutics, Osaka University Graduate School of Medicine, Suita, Japan
| | - Hayato Ito
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Japan
| | - Toshihiko Sugiki
- Laboratory of Molecular Biophysics, Institute for Protein Research, Osaka University, Osaka, Japan
| | - Asako Murata
- Department of Regulatory Bioorganic Chemistry, The Institute of Scientific and28 Industrial Research, Osaka University, Osaka, Japan
| | - Akira Ishiguro
- Research Center for Micro-nano Technology, Hosei University, Tokyo, Japan
| | - Tania Gendron
- Department of Neuroscience, Mayo Clinic, Jacksonville, United States
| | - Kohji Mori
- Department of Psychiatry, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Eiichi Tokuda
- Department of Chemistry, Keio University, Kanagawa, Japan
| | - Tomoya Taminato
- Department of Neurology, Kindai University Faculty of Medicine, Osaka-Sayama, Japan
- Department of Neurotherapeutics, Osaka University Graduate School of Medicine, Suita, Japan
| | - Takuya Konno
- Department of Neurology, Clinical Neuroscience Branch, Brain Research Institute, Niigata University, Niigata, Japan
| | - Akihide Koyama
- Department of Neurology, Clinical Neuroscience Branch, Brain Research Institute, Niigata University, Niigata, Japan
| | - Yuya Kawabe
- Department of Psychiatry, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Toshihide Takeuchi
- Department of Neurotherapeutics, Osaka University Graduate School of Medicine, Suita, Japan
- Life Science Research Institute, Kindai University, Osaka, Japan
| | | | - Toshimichi Fujiwara
- Laboratory of Molecular Biophysics, Institute for Protein Research, Osaka University, Osaka, Japan
| | - Manabu Ikeda
- Department of Psychiatry, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Toshiki Mizuno
- Department of Neurology, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Hideki Mochizuki
- Department of Neurology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Hidehiro Mizusawa
- Department of Neurology and Neurological Science, Tokyo Medical and Dental University, Tokyo, Japan
| | - Keiji Wada
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Kinya Ishikawa
- Department of Neurology and Neurological Science, Tokyo Medical and Dental University, Tokyo, Japan
| | - Osamu Onodera
- Department of Neurology, Clinical Neuroscience Branch, Brain Research Institute, Niigata University, Niigata, Japan
| | - Kazuhiko Nakatani
- Department of Regulatory Bioorganic Chemistry, The Institute of Scientific and28 Industrial Research, Osaka University, Osaka, Japan
| | | | - Hideki Taguchi
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Japan
- Cell Biology Center, Institute of Innovative Research, Tokyo Institute of Technology, Kanagawa, Japan
| | - Yoshitaka Nagai
- Department of Neurology, Kindai University Faculty of Medicine, Osaka-Sayama, Japan
- Department of Neurotherapeutics, Osaka University Graduate School of Medicine, Suita, Japan
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan
- Department of Neurology, Osaka University Graduate School of Medicine, Osaka, Japan
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2
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Ishiguro A, Lu J, Ozawa D, Nagai Y, Ishihama A. ALS-linked FUS mutations dysregulate G-quadruplex-dependent liquid-liquid phase separation and liquid-to-solid transition. J Biol Chem 2021; 297:101284. [PMID: 34624313 PMCID: PMC8567205 DOI: 10.1016/j.jbc.2021.101284] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Revised: 09/29/2021] [Accepted: 10/04/2021] [Indexed: 01/15/2023] Open
Abstract
Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease characterized by the accumulation of protein aggregates in motor neurons. Recent discoveries of genetic mutations in ALS patients promoted research into the complex molecular mechanisms underlying ALS. FUS (fused in sarcoma) is a representative ALS-linked RNA-binding protein (RBP) that specifically recognizes G-quadruplex (G4)-DNA/RNAs. However, the effects of ALS-linked FUS mutations on the G4-RNA-binding activity and the phase behavior have never been investigated. Using the purified full-length FUS, we analyzed the molecular mechanisms of multidomain structures consisting of multiple functional modules that bind to G4. Here we succeeded to observe the liquid–liquid phase separation (LLPS) of FUS condensate formation and subsequent liquid-to-solid transition (LST) leading to the formation of FUS aggregates. This process was markedly promoted through FUS interaction with G4-RNA. To further investigate, we selected a total of eight representative ALS-linked FUS mutants within multidomain structures and purified these proteins. The regulation of G4-RNA-dependent LLPS and LST pathways was lost for all ALS-linked FUS mutants defective in G4-RNA recognition tested, supporting the essential role of G4-RNA in this process. Noteworthy, the P525L mutation that causes juvenile ALS exhibited the largest effect on both G4-RNA binding and FUS aggregation. The findings described herein could provide a clue to the hitherto undefined connection between protein aggregation and dysfunction of RBPs in the complex pathway of ALS pathogenesis.
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Affiliation(s)
- Akira Ishiguro
- Research Center for Micro-Nano Technology, Hosei University, Koganei, Tokyo, Japan.
| | - Jun Lu
- Medical Examination Center, National Center for Global Health and Medicine, Shinjuku-ku, Tokyo, Japan
| | - Daisaku Ozawa
- Department of Neurotherapeutics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan; Department of Neurology, Kindai University Faculty of Medicine, Osaka-Sayama, Osaka, Japan
| | - Yoshitaka Nagai
- Department of Neurotherapeutics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan; Department of Neurology, Kindai University Faculty of Medicine, Osaka-Sayama, Osaka, Japan
| | - Akira Ishihama
- Research Center for Micro-Nano Technology, Hosei University, Koganei, Tokyo, Japan
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3
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Minakawa EN, Popiel HA, Tada M, Takahashi T, Yamane H, Saitoh Y, Takahashi Y, Ozawa D, Takeda A, Takeuchi T, Okamoto Y, Yamamoto K, Suzuki M, Fujita H, Ito C, Yagihara H, Saito Y, Watase K, Adachi H, Katsuno M, Mochizuki H, Shiraki K, Sobue G, Toda T, Wada K, Onodera O, Nagai Y. Arginine is a disease modifier for polyQ disease models that stabilizes polyQ protein conformation. Brain 2021; 143:1811-1825. [PMID: 32436573 DOI: 10.1093/brain/awaa115] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 01/12/2020] [Accepted: 02/23/2020] [Indexed: 12/15/2022] Open
Abstract
The polyglutamine (polyQ) diseases are a group of inherited neurodegenerative diseases that include Huntington's disease, various spinocerebellar ataxias, spinal and bulbar muscular atrophy, and dentatorubral pallidoluysian atrophy. They are caused by the abnormal expansion of a CAG repeat coding for the polyQ stretch in the causative gene of each disease. The expanded polyQ stretches trigger abnormal β-sheet conformational transition and oligomerization followed by aggregation of the polyQ proteins in the affected neurons, leading to neuronal toxicity and neurodegeneration. Disease-modifying therapies that attenuate both symptoms and molecular pathogenesis of polyQ diseases remain an unmet clinical need. Here we identified arginine, a chemical chaperone that facilitates proper protein folding, as a novel compound that targets the upstream processes of polyQ protein aggregation by stabilizing the polyQ protein conformation. We first screened representative chemical chaperones using an in vitro polyQ aggregation assay, and identified arginine as a potent polyQ aggregation inhibitor. Our in vitro and cellular assays revealed that arginine exerts its anti-aggregation property by inhibiting the toxic β-sheet conformational transition and oligomerization of polyQ proteins before the formation of insoluble aggregates. Arginine exhibited therapeutic effects on neurological symptoms and protein aggregation pathology in Caenorhabditis elegans, Drosophila, and two different mouse models of polyQ diseases. Arginine was also effective in a polyQ mouse model when administered after symptom onset. As arginine has been safely used for urea cycle defects and for mitochondrial myopathy, encephalopathy, lactic acid and stroke syndrome patients, and efficiently crosses the blood-brain barrier, a drug-repositioning approach for arginine would enable prompt clinical application as a promising disease-modifier drug for the polyQ diseases.
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Affiliation(s)
- Eiko N Minakawa
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan
| | - Helena Akiko Popiel
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan.,Division of Clinical Genetics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Masayoshi Tada
- Department of Neurology, Brain Research Institute, Niigata University, Niigata, Niigata, Japan
| | - Toshiaki Takahashi
- Department of Neurology, Brain Research Institute, Niigata University, Niigata, Niigata, Japan
| | - Hiroshi Yamane
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan
| | - Yuji Saitoh
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan
| | | | - Daisaku Ozawa
- Department of Neurotherapeutics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Akiko Takeda
- Department of Neurotherapeutics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Toshihide Takeuchi
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan.,Department of Neurotherapeutics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Yuma Okamoto
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan.,Division of Clinical Genetics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Kazuhiro Yamamoto
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan
| | - Mari Suzuki
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan.,Department of Neurotherapeutics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Hiromi Fujita
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan
| | - Chiyomi Ito
- Division of Clinical Genetics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Hiroko Yagihara
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan
| | - Yuko Saito
- Department of Pathology and Laboratory Medicine, National Center Hospital, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan
| | - Kei Watase
- Center for Brain Integration Research, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan
| | - Hiroaki Adachi
- Department of Neurology, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan
| | - Masahisa Katsuno
- Department of Neurology, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan
| | - Hideki Mochizuki
- Department of Neurology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Kentaro Shiraki
- Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Gen Sobue
- Department of Neurology, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan
| | - Tatsushi Toda
- Division of Clinical Genetics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Keiji Wada
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan
| | - Osamu Onodera
- Department of Neurology, Brain Research Institute, Niigata University, Niigata, Niigata, Japan
| | - Yoshitaka Nagai
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan.,Division of Clinical Genetics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.,Department of Neurotherapeutics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.,Department of Neurology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
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4
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Lin Y, Sahoo BR, Ozawa D, Kinoshita M, Kang J, Lim MH, Okumura M, Huh YH, Moon E, Jang JH, Lee HJ, Ryu KY, Ham S, Won HS, Ryu KS, Sugiki T, Bang JK, Hoe HS, Fujiwara T, Ramamoorthy A, Lee YH. Diverse Structural Conversion and Aggregation Pathways of Alzheimer's Amyloid-β (1-40). ACS Nano 2019; 13:8766-8783. [PMID: 31310506 DOI: 10.1021/acsnano.9b01578] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Complex amyloid aggregation of amyloid-β (1-40) (Aβ1-40) in terms of monomer structures has not been fully understood. Herein, we report the microscopic mechanism and pathways of Aβ1-40 aggregation with macroscopic viewpoints through tuning its initial structure and solubility. Partial helical structures of Aβ1-40 induced by low solvent polarity accelerated cytotoxic Aβ1-40 amyloid fibrillation, while predominantly helical folds did not aggregate. Changes in the solvent polarity caused a rapid formation of β-structure-rich protofibrils or oligomers via aggregation-prone helical structures. Modulation of the pH and salt concentration transformed oligomers to protofibrils, which proceeded to amyloid formation. We reveal diverse molecular mechanisms underlying Aβ1-40 aggregation with conceptual energy diagrams and propose that aggregation-prone partial helical structures are key to inducing amyloidogenesis. We demonstrate that context-dependent protein aggregation is comprehensively understood using the macroscopic phase diagram, which provides general insights into differentiation of amyloid formation and phase separation from unfolded and folded structures.
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Affiliation(s)
- Yuxi Lin
- Department of Chemistry , Sookmyung Women's University , Cheongpa-ro 47-gil 100 , Yongsan-gu, Seoul 04310 , South Korea
| | - Bikash R Sahoo
- Biophysics Program and Department of Chemistry, Biomedical Engineering, and Macromolecular Science and Engineering , University of Michigan , Ann Arbor , Michigan 48109-1055 , United States
| | - Daisaku Ozawa
- Department of Neurotherapeutics , Osaka University Graduate School of Medicine , 2-2 Yamadaoka , Suita , Osaka 565-0871 , Japan
| | - Misaki Kinoshita
- Frontier Research Institute for Interdisciplinary Sciences , Tohoku University , 6-3 Aramaki-Aza-Aoba , Aoba-ku, Sendai 980-8578 , Japan
| | - Juhye Kang
- Department of Chemistry , Korea Advanced Institute of Science and Technology , Daejeon 34141 , South Korea
- Department of Chemistry , Ulsan National Institute of Science and Technology , Ulsan 44919 , South Korea
| | - Mi Hee Lim
- Department of Chemistry , Korea Advanced Institute of Science and Technology , Daejeon 34141 , South Korea
| | - Masaki Okumura
- Frontier Research Institute for Interdisciplinary Sciences , Tohoku University , 6-3 Aramaki-Aza-Aoba , Aoba-ku, Sendai 980-8578 , Japan
| | | | | | | | - Hyun-Ju Lee
- Department of Neural Development and Disease , Korea Brain Research Institute , 61 Cheomdan-ro , Dong-gu, Daegu 41068 , South Korea
| | - Ka-Young Ryu
- Department of Neural Development and Disease , Korea Brain Research Institute , 61 Cheomdan-ro , Dong-gu, Daegu 41068 , South Korea
| | - Sihyun Ham
- Department of Chemistry , Sookmyung Women's University , Cheongpa-ro 47-gil 100 , Yongsan-gu, Seoul 04310 , South Korea
| | - Hyung-Sik Won
- Department of Biotechnology, Research Institute and College of Biomedical and Health Science , Konkuk University , Chungju , Chungbuk 27478 , South Korea
| | | | - Toshihiko Sugiki
- Institute for Protein Research , Osaka University , Yamadaoka 3-2 , Suita , Osaka 565-0871 , Japan
| | | | - Hyang-Sook Hoe
- Department of Neural Development and Disease , Korea Brain Research Institute , 61 Cheomdan-ro , Dong-gu, Daegu 41068 , South Korea
| | - Toshimichi Fujiwara
- Institute for Protein Research , Osaka University , Yamadaoka 3-2 , Suita , Osaka 565-0871 , Japan
| | - Ayyalusamy Ramamoorthy
- Biophysics Program and Department of Chemistry, Biomedical Engineering, and Macromolecular Science and Engineering , University of Michigan , Ann Arbor , Michigan 48109-1055 , United States
| | - Young-Ho Lee
- Institute for Protein Research , Osaka University , Yamadaoka 3-2 , Suita , Osaka 565-0871 , Japan
- Bio-Analytical Science , University of Science and Technology , Daejeon 34113 , South Korea
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5
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Ozawa D, Nomura R, Mangione PP, Hasegawa K, Okoshi T, Porcari R, Bellotti V, Naiki H. Antiamyloidogenic and proamyloidogenic chaperone effects of C-reactive protein and serum amyloid P component. Amyloid 2017; 24:28-29. [PMID: 28434325 DOI: 10.1080/13506129.2017.1295943] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Daisaku Ozawa
- a Department of Pathological Sciences , Faculty of Medical Sciences, University of Fukui , Fukui , Japan and
| | - Ryo Nomura
- a Department of Pathological Sciences , Faculty of Medical Sciences, University of Fukui , Fukui , Japan and
| | - P Patrizia Mangione
- b Wolfson Drug Discovery Unit, Centre for Amyloidosis and Acute Phase Proteins, Division of Medicine, University College London , London , UK
| | - Kazuhiro Hasegawa
- a Department of Pathological Sciences , Faculty of Medical Sciences, University of Fukui , Fukui , Japan and
| | - Tadakazu Okoshi
- a Department of Pathological Sciences , Faculty of Medical Sciences, University of Fukui , Fukui , Japan and
| | - Riccardo Porcari
- b Wolfson Drug Discovery Unit, Centre for Amyloidosis and Acute Phase Proteins, Division of Medicine, University College London , London , UK
| | - Vittorio Bellotti
- b Wolfson Drug Discovery Unit, Centre for Amyloidosis and Acute Phase Proteins, Division of Medicine, University College London , London , UK
| | - Hironobu Naiki
- a Department of Pathological Sciences , Faculty of Medical Sciences, University of Fukui , Fukui , Japan and
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6
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Yokobori T, Suzuki S, Miyazaki T, Sohda M, Sakai M, Tanaka N, Ozawa D, Hara K, Honjo H, Altan B, Fukuchi M, Ishii H, Iwatsuki M, Sugimachi K, Sudo T, Iwaya T, Nishida N, Mimori K, Kuwano H, Mori M. Intestinal epithelial culture under an air-liquid interface: a tool for studying human and mouse esophagi. Dis Esophagus 2016; 29:843-847. [PMID: 25809505 DOI: 10.1111/dote.12346] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
This study investigated whether an intestinal epithelial culture method can be applied to mouse and human esophageal cultures. The esophagi harvested from 1-day-old mice and adult humans were maintained in collagen gels. A commercially available culture medium for human embryonic stem cells was used for the human esophageal culture. We discovered that the intestinal epithelial culture method can be successfully applied to both mouse and human esophageal cultures. The long-term cultured esophageal organoids were rod-like luminal structures lined with myofibroblasts. We discovered that regeneration of the esophageal mucosal surface can be almost completely achieved in vitro, and the advantage of this method is that organoid cultures may be generated using host-derived fibroblasts as a niche. This method is a promising tool for mouse and human research in intestinal biology, carcinogenesis, and regenerative medicine.
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Affiliation(s)
- T Yokobori
- Department of General Surgical Science, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - S Suzuki
- Department of General Surgical Science, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - T Miyazaki
- Department of General Surgical Science, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - M Sohda
- Department of General Surgical Science, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - M Sakai
- Department of General Surgical Science, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - N Tanaka
- Department of General Surgical Science, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - D Ozawa
- Department of General Surgical Science, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - K Hara
- Department of General Surgical Science, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - H Honjo
- Department of General Surgical Science, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - B Altan
- Department of General Surgical Science, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - M Fukuchi
- Department of General Surgical Science, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - H Ishii
- Department of Gastroenterological Surgery, Graduate School of Medicine, Osaka University, Suita, Japan
| | - M Iwatsuki
- Department of Surgery, Medical Institute of Bioregulation, Kyushu University, Beppu, Japan
| | - K Sugimachi
- Department of Surgery, Medical Institute of Bioregulation, Kyushu University, Beppu, Japan
| | - T Sudo
- Department of Surgery, Medical Institute of Bioregulation, Kyushu University, Beppu, Japan
| | - T Iwaya
- Department of Surgery, Medical Institute of Bioregulation, Kyushu University, Beppu, Japan
| | - N Nishida
- Department of Surgery, Medical Institute of Bioregulation, Kyushu University, Beppu, Japan
| | - K Mimori
- Department of Surgery, Medical Institute of Bioregulation, Kyushu University, Beppu, Japan
| | - H Kuwano
- Department of General Surgical Science, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - M Mori
- Department of Gastroenterological Surgery, Graduate School of Medicine, Osaka University, Suita, Japan.
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7
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Ozawa D, Nomura R, Mangione PP, Hasegawa K, Okoshi T, Porcari R, Bellotti V, Naiki H. Multifaceted anti-amyloidogenic and pro-amyloidogenic effects of C-reactive protein and serum amyloid P component in vitro. Sci Rep 2016; 6:29077. [PMID: 27380955 PMCID: PMC4933921 DOI: 10.1038/srep29077] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Accepted: 06/10/2016] [Indexed: 01/07/2023] Open
Abstract
C-reactive protein (CRP) and serum amyloid P component (SAP), two major classical pentraxins in humans, are soluble pattern recognition molecules that regulate the innate immune system, but their chaperone activities remain poorly understood. Here, we examined their effects on the amyloid fibril formation from Alzheimer’s amyloid β (Aβ) (1-40) and on that from D76N β2-microglobulin (β2-m) which is related to hereditary systemic amyloidosis. CRP and SAP dose-dependently and substoichiometrically inhibited both Aβ(1-40) and D76N β2-m fibril formation in a Ca2+-independent manner. CRP and SAP interacted with fresh and aggregated Aβ(1-40) and D76N β2-m on the fibril-forming pathway. Interestingly, in the presence of Ca2+, SAP first inhibited, then significantly accelerated D76N β2-m fibril formation. Electron microscopically, the surface of the D76N β2-m fibril was coated with pentameric SAP. These data suggest that SAP first exhibits anti-amyloidogenic activity possibly via A face, followed by pro-amyloidogenic activity via B face, proposing a model that the pro- and anti-amyloidogenic activities of SAP are not mutually exclusive, but reflect two sides of the same coin, i.e., the B and A faces, respectively. Finally, SAP inhibits the heat-induced amorphous aggregation of human glutathione S-transferase. A possible role of pentraxins to maintain extracellular proteostasis is discussed.
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Affiliation(s)
- Daisaku Ozawa
- Life Science Unit, Tenure-Track Program for Innovative Research, University of Fukui, Fukui 910-1193, Japan
| | - Ryo Nomura
- Department of Molecular Pathology, Faculty of Medical Sciences, University of Fukui, Fukui 910-1193, Japan
| | - P Patrizia Mangione
- Wolfson Drug Discovery Unit, Centre for Amyloidosis and Acute Phase Proteins, Division of Medicine, University College London, London NW3 2PF, UK
| | - Kazuhiro Hasegawa
- Department of Molecular Pathology, Faculty of Medical Sciences, University of Fukui, Fukui 910-1193, Japan
| | - Tadakazu Okoshi
- Department of Molecular Pathology, Faculty of Medical Sciences, University of Fukui, Fukui 910-1193, Japan
| | - Riccardo Porcari
- Wolfson Drug Discovery Unit, Centre for Amyloidosis and Acute Phase Proteins, Division of Medicine, University College London, London NW3 2PF, UK
| | - Vittorio Bellotti
- Wolfson Drug Discovery Unit, Centre for Amyloidosis and Acute Phase Proteins, Division of Medicine, University College London, London NW3 2PF, UK
| | - Hironobu Naiki
- Department of Molecular Pathology, Faculty of Medical Sciences, University of Fukui, Fukui 910-1193, Japan
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Naiki H, Okoshi T, Ozawa D, Yamaguchi I, Hasegawa K. Molecular pathogenesis of human amyloidosis: Lessons from β2 -microglobulin-related amyloidosis. Pathol Int 2016; 66:193-201. [PMID: 26969800 DOI: 10.1111/pin.12394] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Revised: 01/28/2016] [Accepted: 01/29/2016] [Indexed: 01/02/2023]
Abstract
Amyloidosis refers to a group of diseases with amyloid fibrils deposited in various organs and is classified into more than 30 diseases in humans based on the kind of amyloid protein. In order to elucidate the molecular pathogenesis of human amyloidosis, we studied the molecular mechanism of amyloid fibril formation in vitro. We first developed a novel fluorometric method to determine amyloid fibrils in vitro based on the unique characteristics of thioflavin T. We next proposed a nucleation-dependent polymerization model to explain the general mechanism of amyloid fibril formation in vitro. Based on this model, we characterized the biological molecular interactions that promote or inhibit amyloid fibril formation in vitro and developed models of pathological molecular environment for inducing human β2-microglobulin-related amyloidosis in long-term hemodialysis patients. We also proposed a novel and attractive cytotoxic mechanism of β2-microglobulin amyloid fibrils, that is, the disruption of endosomal/lysosomal membranes by endocytosed amyloid fibrils. These findings may be useful to elucidate the molecular pathogenesis of other kinds of human amyloidosis.
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Affiliation(s)
- Hironobu Naiki
- Department of Pathological Sciences, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Tadakazu Okoshi
- Department of Pathological Sciences, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Daisaku Ozawa
- Department of Pathological Sciences, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Itaru Yamaguchi
- Department of Pathological Sciences, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Kazuhiro Hasegawa
- Department of Pathological Sciences, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
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Okoshi T, Yamaguchi I, Ozawa D, Hasegawa K, Naiki H. Endocytosed 2-Microglobulin Amyloid Fibrils Induce Necrosis and Apoptosis of Rabbit Synovial Fibroblasts by Disrupting Endosomal/Lysosomal Membranes: A Novel Mechanism on the Cytotoxicity of Amyloid Fibrils. PLoS One 2015; 10:e0139330. [PMID: 26421922 PMCID: PMC4589361 DOI: 10.1371/journal.pone.0139330] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Accepted: 09/11/2015] [Indexed: 12/20/2022] Open
Abstract
Dialysis-related amyloidosis is a major complication in long-term hemodialysis patients. In dialysis-related amyloidosis, β2-microglobulin (β2-m) amyloid fibrils deposit in the osteoarticular tissue, leading to carpal tunnel syndrome and destructive arthropathy with cystic bone lesions, but the mechanism by which these amyloid fibrils destruct bone and joint tissue is not fully understood. In this study, we assessed the cytotoxic effect of β2-m amyloid fibrils on the cultured rabbit synovial fibroblasts. Under light microscopy, the cells treated with amyloid fibrils exhibited both necrotic and apoptotic changes, while the cells treated with β2-m monomers and vehicle buffer exhibited no morphological changes. As compared to β2-m monomers and vehicle buffer, β2-m amyloid fibrils significantly reduced cellular viability as measured by the lactate dehydrogenase release assay and the 3-(4,5-di-methylthiazol-2-yl)-2,5-diphenyltetrazolium bromide reduction assay and significantly increased the percentage of apoptotic cells as measured by the terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling method. β2-m amyloid fibrils added to the medium adhered to cell surfaces, but did not disrupt artificial plasma membranes as measured by the liposome dye release assay. Interestingly, when the cells were incubated with amyloid fibrils for several hours, many endosomes/lysosomes filled with amyloid fibrils were observed under confocal laser microscopy and electron microscopy, Moreover, some endosomal/lysosomal membranes were disrupted by intravesicular fibrils, leading to the leakage of the fibrils into the cytosol and adjacent to mitochondria. Inhibition of actin-dependent endocytosis by cytochalasin D attenuated the toxicity of amyloid fibrils. These results suggest that endocytosed β2-m amyloid fibrils induce necrosis and apoptosis by disrupting endosomal/lysosomal membranes, and this novel mechanism on the cytotoxicity of amyloid fibrils is described.
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Affiliation(s)
- Tadakazu Okoshi
- Division of Molecular Pathology, Department of Pathological Sciences, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Itaru Yamaguchi
- Division of Molecular Pathology, Department of Pathological Sciences, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Daisaku Ozawa
- Division of Molecular Pathology, Department of Pathological Sciences, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Kazuhiro Hasegawa
- Division of Molecular Pathology, Department of Pathological Sciences, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Hironobu Naiki
- Division of Molecular Pathology, Department of Pathological Sciences, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
- * E-mail:
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Ozawa D, Kaji Y, Yagi H, Sakurai K, Kawakami T, Naiki H, Goto Y. Destruction of amyloid fibrils of keratoepithelin peptides by laser irradiation coupled with amyloid-specific thioflavin T. J Biol Chem 2011; 286:10856-63. [PMID: 21300800 DOI: 10.1074/jbc.m111.222901] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Mutations in keratoepithelin are associated with blinding ocular diseases, including lattice corneal dystrophy type 1 and granular corneal dystrophy type 2. These diseases are characterized by deposits of amyloid fibrils and/or granular non-amyloid aggregates in the cornea. Removing the deposits in the cornea is important for treatment. Previously, we reported the destruction of amyloid fibrils of β(2)-microglobulin K3 fragments and amyloid β by laser irradiation coupled with the binding of an amyloid-specific thioflavin T. Here, we studied the effects of this combination on the amyloid fibrils of two 22-residue fragments of keratoepithelin. The direct observation of individual amyloid fibrils was performed in real time using total internal reflection fluorescence microscopy. Both types of amyloid fibrils were broken up by the laser irradiation, dependent on the laser power. The results suggest the laser-induced destruction of amyloid fibrils to be a useful strategy for the treatment of these corneal dystrophies.
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Affiliation(s)
- Daisaku Ozawa
- Institute for Protein Research, Osaka University, Yamadaoka 3-2, Suita, Osaka 565-0871, Japan
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Ozawa D, Hasegawa K, Lee YH, Sakurai K, Yanagi K, Ookoshi T, Goto Y, Naiki H. Inhibition of beta2-microglobulin amyloid fibril formation by alpha2-macroglobulin. J Biol Chem 2011; 286:9668-76. [PMID: 21216953 DOI: 10.1074/jbc.m110.167965] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The relationship between various amyloidoses and chaperones is gathering attention. In patients with dialysis-related amyloidosis, α(2)-macroglobulin (α2M), an extracellular chaperone, forms a complex with β(2)-microglobulin (β2-m), a major component of amyloid fibrils, but the molecular mechanisms and biological implications of the complex formation remain unclear. Here, we found that α2M substoichiometrically inhibited the β2-m fibril formation at a neutral pH in the presence of SDS, a model for anionic lipids. Binding analysis showed that the binding affinity between α2M and β2-m in the presence of SDS was higher than that in the absence of SDS. Importantly, SDS dissociated tetrameric α2M into dimers with increased surface hydrophobicity. Western blot analysis revealed that both tetrameric and dimeric α2M interacted with SDS-denatured β2-m. At a physiologically relevant acidic pH and in the presence of heparin, α2M was also dissociated into dimers, and both tetrameric and dimeric α2M interacted with β2-m, resulting in the inhibition of fibril growth reaction. These results suggest that under conditions where native β2-m is denatured, tetrameric α2M is also converted to dimeric form with exposed hydrophobic surfaces to favor the hydrophobic interaction with denatured β2-m, thus dimeric α2M as well as tetrameric α2M may play an important role in controlling β2-m amyloid fibril formation.
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Affiliation(s)
- Daisaku Ozawa
- Department of Pathological Sciences, Faculty of Medical Sciences, University of Fukui, Fukui 910-1193, Japan
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Morinaga A, Hasegawa K, Nomura R, Ookoshi T, Ozawa D, Goto Y, Yamada M, Naiki H. P1‐230: The role of interfaces and agitation on the fibril formation of amyloid β‐protein. Alzheimers Dement 2010. [DOI: 10.1016/j.jalz.2010.05.781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Akiyoshi Morinaga
- Division of Molecular Pathology, Department of Pathological Sciences, Faculty of Medical Sciences University of FukuiFukui Japan
- Department of Neurology and Neurobiology of Aging Kanazawa University Graduate School of Medical ScienceKanazawa Japan
| | - Kazuhiro Hasegawa
- Division of Molecular Pathology, Department of Pathological Sciences, Faculty of Medical Sciences University of FukuiFukui Japan
| | - Ryo Nomura
- Division of Molecular Pathology, Department of Pathological Sciences, Faculty of Medical Sciences University of FukuiFukui Japan
| | - Tadakazu Ookoshi
- Division of Molecular Pathology, Department of Pathological Sciences, Faculty of Medical Sciences University of FukuiFukui Japan
| | - Daisaku Ozawa
- Division of Molecular Pathology, Department of Pathological Sciences, Faculty of Medical Sciences University of FukuiFukui Japan
| | - Yuji Goto
- Institute for Protein Research, Osaka UniversityOsaka Japan
| | - Masahito Yamada
- Department of Neurology and Neurobiology of Aging Kanazawa University Graduate School of Medical ScienceKanazawa Japan
| | - Hironobu Naiki
- Division of Molecular Pathology, Department of Pathological Sciences, Faculty of Medical Sciences University of FukuiFukui Japan
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Yagi H, Ozawa D, Sakurai K, Kawakami T, Kuyama H, Nishimura O, Shimanouchi T, Kuboi R, Naiki H, Goto Y. Laser-induced propagation and destruction of amyloid beta fibrils. J Biol Chem 2010; 285:19660-7. [PMID: 20406822 DOI: 10.1074/jbc.m109.076505] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The amyloid deposition of amyloid beta (Abeta) peptides is a critical pathological event in Alzheimer disease (AD). Preventing the formation of amyloid deposits and removing preformed fibrils in tissues are important therapeutic strategies against AD. Previously, we reported the destruction of amyloid fibrils of beta(2)-microglobulin K3 fragments by laser irradiation coupled with the binding of amyloid-specific thioflavin T. Here, we studied the effects of a laser beam on Abeta fibrils. As was the case for K3 fibrils, extensive irradiation destroyed the preformed Abeta fibrils. However, irradiation during spontaneous fibril formation resulted in only the partial destruction of growing fibrils and a subsequent explosive propagation of fibrils. The explosive propagation was caused by an increase in the number of active ends due to breakage. The results not only reveal a case of fragmentation-induced propagation of fibrils but also provide insights into therapeutic strategies for AD.
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Affiliation(s)
- Hisashi Yagi
- Institute for Protein Research, Osaka University, Yamadaoka 3-2, Suita, Osaka 565-0871, Japan
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14
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Morinaga A, Hasegawa K, Nomura R, Ookoshi T, Ozawa D, Goto Y, Yamada M, Naiki H. Critical role of interfaces and agitation on the nucleation of Abeta amyloid fibrils at low concentrations of Abeta monomers. Biochim Biophys Acta 2010; 1804:986-95. [PMID: 20100601 DOI: 10.1016/j.bbapap.2010.01.012] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2009] [Revised: 01/10/2010] [Accepted: 01/13/2010] [Indexed: 11/19/2022]
Abstract
Amyloid deposits are pathological hallmarks of various neurodegenerative diseases including Alzheimer's disease (AD), where amyloid beta-peptide (Abeta) polymerizes into amyloid fibrils by a nucleation-dependent polymerization mechanism. The biological membranes or other interfaces as well as the convection of the extracellular fluids in the brain may influence Abeta amyloid fibril formation in vivo. Here, we examined the polymerization kinetics of 2.5, 5, 10 and 20 microM Abeta in the presence or absence of air-water interface (AWI) using fluorescence spectroscopy and fluorescence microscopy with the amyloid specific dye, thioflavin T. When the solutions were incubated with AWI and in quiescence, amyloid fibril formation was observed at all Abeta concentrations examined. In contrast, when incubated without AWI, amyloid fibril formation was observed only at higher Abeta concentrations (10 and 20 microM). Importantly, when the 5 microM Abeta solution was incubated with AWI, a ThT-reactive film was first observed at AWI without any other ThT-reactive aggregates in the bulk. When 5 microM Abeta solutions were voltexed or rotated with AWI, amyloid fibril formation was considerably accelerated, where a ThT-reactive film was first observed at AWI before ThT-reactive aggregates were observed throughout the mixture. When 5 microM Abeta solutions containing a polypropylene disc were rotated without AWI, amyloid fibril formation was also considerably accelerated, where fine ThT-reactive aggregates were first found attached at the edge of the disc. These results indicate the critical roles of interfaces and agitation for amyloid fibril formation. Furthermore, elimination of AWI may be essential for proper evaluation of the roles of various biological molecules in the amyloid formation studies in vitro.
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Affiliation(s)
- Akiyoshi Morinaga
- Division of Molecular Pathology, Department of Pathological Sciences, Faculty of Medical Sciences, University of Fukui, Fukui 910-1193, Japan
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Lee YH, Ozawa D, Goto Y. [New world of amyloid science]. Seikagaku 2009; 81:677-687. [PMID: 19803391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Affiliation(s)
- Young-Ho Lee
- Laboratory of Protein Folding, Division of Protein Structural Biology, Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita, Osaka 565-0871, Japan
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Ozawa D, Yagi H, Ban T, Kameda A, Kawakami T, Naiki H, Goto Y. Destruction of Amyloid Fibrils of a β2-Microglobulin Fragment by Laser Beam Irradiation. J Biol Chem 2009; 284:1009-17. [DOI: 10.1074/jbc.m805118200] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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Yamamoto K, Yagi H, Ozawa D, Sasahara K, Naiki H, Goto Y. Thiol Compounds Inhibit the Formation of Amyloid Fibrils by β2-Microglobulin at Neutral pH. J Mol Biol 2008; 376:258-68. [DOI: 10.1016/j.jmb.2007.12.002] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2007] [Revised: 11/23/2007] [Accepted: 12/01/2007] [Indexed: 11/28/2022]
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