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Abraham E, Athapaththu AMGK, Atanasova KR, Chen QY, Corcoran TJ, Piloto J, Wu CW, Ratnayake R, Luesch H, Choe KP. Chemical Genetics in C. elegans Identifies Anticancer Mycotoxins Chaetocin and Chetomin as Potent Inducers of a Nuclear Metal Homeostasis Response. ACS Chem Biol 2024; 19:1180-1193. [PMID: 38652683 PMCID: PMC11102292 DOI: 10.1021/acschembio.4c00131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2024]
Abstract
C. elegans numr-1/2 (nuclear-localized metal-responsive) is an identical gene pair encoding a nuclear protein previously shown to be activated by cadmium and disruption of the integrator RNA metabolism complex. We took a chemical genetic approach to further characterize regulation of this novel metal response by screening 41,716 compounds and extracts for numr-1p::GFP activation. The most potent activator was chaetocin, a fungal 3,6-epidithiodiketopiperazine (ETP) with promising anticancer activity. Chaetocin activates numr-1/2 strongly in the alimentary canal but is distinct from metal exposure, because it represses canonical cadmium-responsive metallothionine genes. Chaetocin has diverse targets in cancer cells including thioredoxin reductase, histone lysine methyltransferase, and acetyltransferase p300/CBP; further work is needed to identify the mechanism in C. elegans as genetic disruption and RNAi screening of homologues did not induce numr-1/2 in the alimentary canal and chaetocin did not affect markers of integrator dysfunction. We demonstrate that disulfides in chaetocin and chetomin, a dimeric ETP analog, are required to induce numr-1/2. ETP monomer gliotoxin, despite possessing a disulfide linkage, had almost no effect on numr-1/2, suggesting a dimer requirement. Chetomin inhibits C. elegans growth at low micromolar levels, and loss of numr-1/2 increases sensitivity; C. elegans and Chaetomiaceae fungi inhabit similar environments raising the possibility that numr-1/2 functions as a defense mechanism. There is no direct orthologue of numr-1/2 in humans, but RNaseq suggests that chaetocin affects expression of cellular processes linked to stress response and metal homeostasis in colorectal cancer cells. Our results reveal interactions between metal response gene regulation and ETPs and identify a potential mechanism of resistance to this versatile class of preclinical compounds.
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Affiliation(s)
- Elijah Abraham
- Department of Biology, University of Florida, Gainesville, FL 32611, USA
| | | | - Kalina R. Atanasova
- Department of Medicinal Chemistry, University of Florida, Gainesville, Florida 32610, United States
- Center for Natural Products, Drug Discovery and Development, University of Florida, Gainesville, Florida 32610, United States
| | - Qi-Yin Chen
- Department of Medicinal Chemistry, University of Florida, Gainesville, Florida 32610, United States
- Center for Natural Products, Drug Discovery and Development, University of Florida, Gainesville, Florida 32610, United States
| | - Taylor J. Corcoran
- Department of Medicinal Chemistry, University of Florida, Gainesville, Florida 32610, United States
- Center for Natural Products, Drug Discovery and Development, University of Florida, Gainesville, Florida 32610, United States
| | - Juan Piloto
- Department of Biology, University of Florida, Gainesville, FL 32611, USA
| | - Cheng-Wei Wu
- Department of Veterinary Biomedical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, S&N 5B4 Canada
| | - Ranjala Ratnayake
- Department of Medicinal Chemistry, University of Florida, Gainesville, Florida 32610, United States
- Center for Natural Products, Drug Discovery and Development, University of Florida, Gainesville, Florida 32610, United States
| | - Hendrik Luesch
- Department of Medicinal Chemistry, University of Florida, Gainesville, Florida 32610, United States
- Center for Natural Products, Drug Discovery and Development, University of Florida, Gainesville, Florida 32610, United States
| | - Keith P. Choe
- Department of Biology, University of Florida, Gainesville, FL 32611, USA
- Center for Natural Products, Drug Discovery and Development, University of Florida, Gainesville, Florida 32610, United States
- Genetics Institute, University of Florida, Gainesville, FL 32610, USA
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Wu Y, Chen Y, Yu X, Zhang M, Li Z. Towards Understanding Neurodegenerative Diseases: Insights from Caenorhabditis elegans. Int J Mol Sci 2023; 25:443. [PMID: 38203614 PMCID: PMC10778690 DOI: 10.3390/ijms25010443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Revised: 12/23/2023] [Accepted: 12/27/2023] [Indexed: 01/12/2024] Open
Abstract
The elevated occurrence of debilitating neurodegenerative disorders, such as amyotrophic lateral sclerosis (ALS), Huntington's disease (HD), Alzheimer's disease (AD), Parkinson's disease (PD) and Machado-Joseph disease (MJD), demands urgent disease-modifying therapeutics. Owing to the evolutionarily conserved molecular signalling pathways with mammalian species and facile genetic manipulation, the nematode Caenorhabditis elegans (C. elegans) emerges as a powerful and manipulative model system for mechanistic insights into neurodegenerative diseases. Herein, we review several representative C. elegans models established for five common neurodegenerative diseases, which closely simulate disease phenotypes specifically in the gain-of-function aspect. We exemplify applications of high-throughput genetic and drug screenings to illustrate the potential of C. elegans to probe novel therapeutic targets. This review highlights the utility of C. elegans as a comprehensive and versatile platform for the dissection of neurodegenerative diseases at the molecular level.
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Affiliation(s)
| | | | | | | | - Zhaoyu Li
- Queensland Brain Institute, The University of Queensland, Brisbane, QLD 4072, Australia; (Y.W.); (Y.C.); (X.Y.); (M.Z.)
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Li JJ, Xin N, Yang C, Tavizon LA, Hong R, Moore TI, Tharyan RG, Antebi A, Kim HE. Unveiling the Intercompartmental Signaling Axis: Mitochondrial to ER Stress Response (MERSR) and its Impact on Proteostasis. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.09.07.556674. [PMID: 38187690 PMCID: PMC10769184 DOI: 10.1101/2023.09.07.556674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2024]
Abstract
Maintaining protein homeostasis is essential for cellular health. During times of proteotoxic stress, cells deploy unique defense mechanisms to achieve resolution. Our previous research uncovered a cross-compartmental Mitochondrial to Cytosolic Stress Response (MCSR), a unique stress response activated by the perturbation of mitochondrial proteostasis, which ultimately results in the improvement of proteostasis in the cytosol. Here, we found that this signaling axis also influences the unfolded protein response of the endoplasmic reticulum (UPR ER ), suggesting the presence of a Mitochondria to ER Stress Response (MERSR). During MERSR, the IRE1 branch of UPR ER is inhibited, introducing a previously unknown regulatory component of MCSR. Moreover, proteostasis is enhanced through the upregulation of the PERK-eIF2a signaling pathway, increasing phosphorylation of eIF2a and improving the ER's capacity to manage greater proteostasis load. MERSR activation in both poly-glutamine (poly-Q) and amyloid-beta (Aβ) C. elegans disease models also led to improvement in both aggregate burden and overall disease outcome. These findings shed light on the coordination between the mitochondria and the ER in maintaining cellular proteostasis and provides further evidence for the importance of intercompartmental signaling.
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Paterna A, Santonicola P, Di Prima G, Rao E, Raccosta S, Zampi G, Russo C, Moran O, Manno M, Di Schiavi E, Librizzi F, Carrotta R. α S1-Casein-Loaded Proteo-liposomes as Potential Inhibitors in Amyloid Fibrillogenesis: In Vivo Effects on a C. elegans Model of Alzheimer's Disease. ACS Chem Neurosci 2023; 14:3894-3904. [PMID: 37847529 PMCID: PMC10623563 DOI: 10.1021/acschemneuro.3c00239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Accepted: 09/18/2023] [Indexed: 10/18/2023] Open
Abstract
According to the amyloid hypothesis, in the early phases of Alzheimer's disease (AD), small soluble prefibrillar aggregates of the amyloid β-peptide (Aβ) interact with neuronal membranes, causing neural impairment. Such highly reactive and toxic species form spontaneously and transiently in the amyloid building pathway. A therapeutic strategy consists of the recruitment of these intermediates, thus preventing aberrant interaction with membrane components (lipids and receptors), which in turn may trigger a cascade of cellular disequilibria. Milk αs1-Casein is an intrinsically disordered protein that is able to inhibit Aβ amyloid aggregation in vitro, by sequestering transient species. In order to test αs1-Casein as an inhibitor for the treatment of AD, it needs to be delivered in the place of action. Here, we demonstrate the use of large unilamellar vesicles (LUVs) as suitable nanocarriers for αs1-Casein. Proteo-LUVs were prepared and characterized by different biophysical techniques, such as multiangle light scattering, atomic force imaging, and small-angle X-ray scattering; αs1-Casein loading was quantified by a fluorescence assay. We demonstrated on a C. elegans AD model the effectiveness of the proposed delivery strategy in vivo. Proteo-LUVs allow efficient administration of the protein, exerting a positive functional readout at very low doses while avoiding the intrinsic toxicity of αs1-Casein. Proteo-LUVs of αs1-Casein represent an effective proof of concept for the exploitation of partially disordered proteins as a therapeutic strategy in mild AD conditions.
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Affiliation(s)
- Angela Paterna
- Institute
of Biophysics, National Research Council, Division of Palermo, Via Ugo La Malfa 153, 90146 Palermo, Italy
| | - Pamela Santonicola
- Institute
of Biosciences and Bioresources, Division of Napoli, Via Pietro Castellino 111, 80131 Napoli, Italy
- Department
of Medicine and Health Sciences, University
of Molise, 86100 Campobasso, Italy
| | - Giulia Di Prima
- Department
of Biological, Chemical and Pharmaceutical Sciences and Technologies, University of Palermo, 90123 Palermo, Italy
| | - Estella Rao
- Institute
of Biophysics, National Research Council, Division of Palermo, Via Ugo La Malfa 153, 90146 Palermo, Italy
| | - Samuele Raccosta
- Institute
of Biophysics, National Research Council, Division of Palermo, Via Ugo La Malfa 153, 90146 Palermo, Italy
| | - Giuseppina Zampi
- Institute
of Biosciences and Bioresources, Division of Napoli, Via Pietro Castellino 111, 80131 Napoli, Italy
| | - Claudio Russo
- Department
of Medicine and Health Sciences, University
of Molise, 86100 Campobasso, Italy
- Consorzio
Interuniversitario in Ingegneria e Medicina (COIIM), Via F. De Sanctis, 86100 Campobasso, Italy
| | - Oscar Moran
- Institute
of Biophysics, National Research Council, Division of Genova, Via De Marini 6, 16149 Genova, Italy
| | - Mauro Manno
- Institute
of Biophysics, National Research Council, Division of Palermo, Via Ugo La Malfa 153, 90146 Palermo, Italy
| | - Elia Di Schiavi
- Institute
of Biosciences and Bioresources, Division of Napoli, Via Pietro Castellino 111, 80131 Napoli, Italy
| | - Fabio Librizzi
- Institute
of Biophysics, National Research Council, Division of Palermo, Via Ugo La Malfa 153, 90146 Palermo, Italy
| | - Rita Carrotta
- Institute
of Biophysics, National Research Council, Division of Palermo, Via Ugo La Malfa 153, 90146 Palermo, Italy
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Song X, Ding Q, Wei W, Zhang J, Sun R, Yin L, Liu S, Pu Y. Peptide-Functionalized Prussian Blue Nanomaterial for Antioxidant Stress and NIR Photothermal Therapy against Alzheimer's Disease. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2206959. [PMID: 37322406 DOI: 10.1002/smll.202206959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 05/18/2023] [Indexed: 06/17/2023]
Abstract
Excessive accumulations of reactive oxygen species (ROS) and amyloid-β (Aβ) protein are closely associated with the complex pathogenesis of Alzheimer's disease (AD). Therefore, approaches that synergistically exert elimination of ROS and dissociation of Aβ fibrils are effective therapeutic strategies for correcting the AD microenvironment. Herein, a novel near infrared (NIR) responsive Prussian blue-based nanomaterial (PBK NPs) is established with excellent antioxidant activity and photothermal effect. PBK NPs possess similar activities to multiple antioxidant enzymes, including superoxide dismutase, peroxidase, and catalase, which can eliminate massive ROS and relieve oxidative stress. Under the NIR irradiation, PBK NPs can generate local heat to disaggregate Aβ fibrils efficiently. By modifying CKLVFFAED peptide, PBK NPs display obvious targeting ability for blood-brain barrier penetration and Aβ binding. Furthermore, in vivo studies demonstrate that PBK NPs have outstanding ability to decompose Aβ plaques and alleviate neuroinflammation in AD mouse model. Overall, PBK NPs provide evident neuroprotection by reducing ROS levels and regulating Aβ deposition, and may accelerate the development of multifunctional nanomaterials for delaying the progression of AD.
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Affiliation(s)
- Xiaolei Song
- Key Laboratory of Environmental Medicine Engineering of Ministry of Education, School of Public Health, Southeast University, Nanjing, 210009, P. R. China
| | - Qin Ding
- Key Laboratory of Environmental Medicine Engineering of Ministry of Education, School of Public Health, Southeast University, Nanjing, 210009, P. R. China
| | - Wei Wei
- Key Laboratory of Environmental Medicine Engineering of Ministry of Education, School of Public Health, Southeast University, Nanjing, 210009, P. R. China
- State Key Laboratory of Bioelectronics, Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, P. R. China
| | - Juan Zhang
- Key Laboratory of Environmental Medicine Engineering of Ministry of Education, School of Public Health, Southeast University, Nanjing, 210009, P. R. China
| | - Rongli Sun
- Key Laboratory of Environmental Medicine Engineering of Ministry of Education, School of Public Health, Southeast University, Nanjing, 210009, P. R. China
| | - Lihong Yin
- Key Laboratory of Environmental Medicine Engineering of Ministry of Education, School of Public Health, Southeast University, Nanjing, 210009, P. R. China
| | - Songqin Liu
- State Key Laboratory of Bioelectronics, Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, P. R. China
| | - Yuepu Pu
- Key Laboratory of Environmental Medicine Engineering of Ministry of Education, School of Public Health, Southeast University, Nanjing, 210009, P. R. China
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Jongsma E, Goyala A, Mateos JM, Ewald CY. Removal of extracellular human amyloid beta aggregates by extracellular proteases in C. elegans. eLife 2023; 12:e83465. [PMID: 37728486 PMCID: PMC10541181 DOI: 10.7554/elife.83465] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Accepted: 09/19/2023] [Indexed: 09/21/2023] Open
Abstract
The amyloid beta (Aβ) plaques found in Alzheimer's disease (AD) patients' brains contain collagens and are embedded extracellularly. Several collagens have been proposed to influence Aβ aggregate formation, yet their role in clearance is unknown. To investigate the potential role of collagens in forming and clearance of extracellular aggregates in vivo, we created a transgenic Caenorhabditis elegans strain that expresses and secretes human Aβ1-42. This secreted Aβ forms aggregates in two distinct places within the extracellular matrix. In a screen for extracellular human Aβ aggregation regulators, we identified different collagens to ameliorate or potentiate Aβ aggregation. We show that a disintegrin and metalloprotease a disintegrin and metalloprotease 2 (ADM-2), an ortholog of ADAM9, reduces the load of extracellular Aβ aggregates. ADM-2 is required and sufficient to remove the extracellular Aβ aggregates. Thus, we provide in vivo evidence of collagens essential for aggregate formation and metalloprotease participating in extracellular Aβ aggregate removal.
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Affiliation(s)
- Elisabeth Jongsma
- Laboratory of Extracellular Matrix Regeneration, Institute of Translational Medicine, Department of Health Sciences and Technology, ETH ZürichSchwerzenbachSwitzerland
| | - Anita Goyala
- Laboratory of Extracellular Matrix Regeneration, Institute of Translational Medicine, Department of Health Sciences and Technology, ETH ZürichSchwerzenbachSwitzerland
| | - José Maria Mateos
- Center for Microscopy and Image Analysis, University of ZurichZurichSwitzerland
| | - Collin Yvès Ewald
- Laboratory of Extracellular Matrix Regeneration, Institute of Translational Medicine, Department of Health Sciences and Technology, ETH ZürichSchwerzenbachSwitzerland
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7
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Shi L, Yu XT, Li H, Wu GS, Luo HR. D-chiro-inositol increases antioxidant capacity and longevity of Caenorhabditis elegans via activating Nrf-2/SKN-1 and FOXO/DAF-16. Exp Gerontol 2023; 175:112145. [PMID: 36921677 DOI: 10.1016/j.exger.2023.112145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 02/26/2023] [Accepted: 03/12/2023] [Indexed: 03/18/2023]
Abstract
D-chiro-inositol (DCI) is an isomer of inositol, abundant in many foods, such as beans and buckwheat, with insulin-sensitizing, anti-inflammatory, and antioxidant effects. DCI has been used to relieve insulin resistance in diabetes and polycystic ovary syndrome in combination with inositol or D-pinitol. Here, we investigated the effect of DCI on aging and stress resistance in C. elegans. We found that DCI could prolong the lifespan of C. elegans by up to 29.6 %. DCI significantly delayed the onset of neurodegenerative diseases in models of C. elegans. DCI decreased the accumulation of Aβ1-42, alpha-synuclein, and poly-glutamine, the pathological causes of Alzheimer's, Parkinson's, and Huntington's diseases, respectively. DCI significantly increased the stress resistances against pathogens, oxidants and heat shock. Moreover, D-chiro-inositol reduced the content of ROS and malondialdehyde by increasing the total antioxidant capacity and the activity of superoxide dismutase and catalase. Above effects of DCI requires the transcription factors FOXO/DAF-16 and Nrf-2/SKN-1. DCI also increased the expression of downstream genes regulated by FOXO/DAF-16 and Nrf-2/SKN-1. In conclusion, DCI enhanced the antioxidant capacity and healthy lifespan of C. elegans by activating DAF-16, SKN-1, and HSF-1. Our results showed that DCI could be a promising antiaging agent that is worth further research on the mechanism and health supplemental application of DCI.
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Affiliation(s)
- Lin Shi
- Key Laboratory of Luzhou City for Aging Medicine, Department of Pharmacology, School of Pharmacy, Southwest Medical University, Luzhou, Sichuan 646000, China; Dazhou Vocational College of Chinese Medicine, Dazhou, Sichuan 635000, China; Department of Pharmacy, the People's Hospital of Zhongjiang, Deyang, Sichuan 618100, China
| | - Xin-Tian Yu
- Key Laboratory of Luzhou City for Aging Medicine, Department of Pharmacology, School of Pharmacy, Southwest Medical University, Luzhou, Sichuan 646000, China
| | - Han Li
- Key Laboratory of Luzhou City for Aging Medicine, Department of Pharmacology, School of Pharmacy, Southwest Medical University, Luzhou, Sichuan 646000, China
| | - Gui-Sheng Wu
- Key Laboratory of Luzhou City for Aging Medicine, Department of Pharmacology, School of Pharmacy, Southwest Medical University, Luzhou, Sichuan 646000, China; Central Nervous System Drug Key Laboratory of Sichuan Province, Luzhou, Sichuan 646000, China.
| | - Huai-Rong Luo
- Key Laboratory of Luzhou City for Aging Medicine, Department of Pharmacology, School of Pharmacy, Southwest Medical University, Luzhou, Sichuan 646000, China; Dazhou Vocational College of Chinese Medicine, Dazhou, Sichuan 635000, China; Central Nervous System Drug Key Laboratory of Sichuan Province, Luzhou, Sichuan 646000, China; Key Laboratory of Medical Electrophysiology, Ministry of Education & Medical Electrophysiological Key Laboratory of Sichuan, Institute of Cardiovascular Research, Southwest Medical University, Luzhou, Sichuan 646000, China.
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Képes Z, Barkóczi A, Szabó JP, Kálmán-Szabó I, Arató V, Jószai I, Deák Á, Kertész I, Hajdu I, Trencsényi G. In Vivo Preclinical Assessment of β-Amyloid-Affine [ 11C]C-PIB Accumulation in Aluminium-Induced Alzheimer's Disease-Resembling Hypercholesterinaemic Rat Model. Int J Mol Sci 2022; 23:ijms232213950. [PMID: 36430429 PMCID: PMC9695619 DOI: 10.3390/ijms232213950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 11/09/2022] [Accepted: 11/11/2022] [Indexed: 11/16/2022] Open
Abstract
Aluminum (Al) excess and hypercholesterinaemia are established risks of Alzheimer's disease (AD). The aim of this study was to establish an AD-resembling hypercholesterinaemic animal model-with the involvement of 8 week and 48 week-old Fischer-344 rats-by Al administration for the safe and rapid verification of β-amyloid-targeted positron emission tomography (PET) radiopharmaceuticals. Measurement of lipid parameters and β-amyloid-affine [11C]C-Pittsburgh Compound B ([11C]C-PIB) PET examinations were performed. Compared with the control, the significantly elevated cholesterol and LDL levels of the rats receiving the cholesterol-rich diet support the development of hypercholesterinaemia (p ≤ 0.01). In the older cohort, a notably increased age-related radiopharmaceutical accumulation was registered compared to in the young (p ≤ 0.05; p ≤ 0.01). A monotherapy-induced slight elevation of mean standardised uptake values (SUVmean) was statistically not significant; however, adult rats administered a combined diet expressed remarkable SUVmean increment compared to the adult control (SUVmean: from 0.78 ± 0.16 to 1.99 ± 0.28). One and two months after restoration to normal diet, the cerebral [11C]C-PIB accumulation of AD-mimicking animals decreased by half and a third, respectively, to the baseline value. The proposed in vivo Al-induced AD-resembling animal system seems to be adequate for the understanding of AD neuropathology and future drug testing and radiopharmaceutical development.
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Affiliation(s)
- Zita Képes
- Division of Nuclear Medicine and Translational Imaging, Department of Medical Imaging, Faculty of Medicine, University of Debrecen, Nagyerdei St. 98, H-4032 Debrecen, Hungary
- Correspondence:
| | - Alexandra Barkóczi
- Department of Urology, Faculty of Medicine, University of Debrecen, Nagyerdei St. 98, H-4032 Debrecen, Hungary
- Doctoral School of Clinical Medicine, Faculty of Medicine, University of Debrecen, Nagyerdei St. 98, H-4032 Debrecen, Hungary
| | - Judit P. Szabó
- Division of Nuclear Medicine and Translational Imaging, Department of Medical Imaging, Faculty of Medicine, University of Debrecen, Nagyerdei St. 98, H-4032 Debrecen, Hungary
- Doctoral School of Clinical Medicine, Faculty of Medicine, University of Debrecen, Nagyerdei St. 98, H-4032 Debrecen, Hungary
| | - Ibolya Kálmán-Szabó
- Division of Nuclear Medicine and Translational Imaging, Department of Medical Imaging, Faculty of Medicine, University of Debrecen, Nagyerdei St. 98, H-4032 Debrecen, Hungary
- Gyula Petrányi Doctoral School of Clinical Immunology and Allergology, Faculty of Medicine, University of Debrecen, Nagyerdei St. 98, H-4032 Debrecen, Hungary
| | - Viktória Arató
- Division of Nuclear Medicine and Translational Imaging, Department of Medical Imaging, Faculty of Medicine, University of Debrecen, Nagyerdei St. 98, H-4032 Debrecen, Hungary
| | - István Jószai
- Division of Nuclear Medicine and Translational Imaging, Department of Medical Imaging, Faculty of Medicine, University of Debrecen, Nagyerdei St. 98, H-4032 Debrecen, Hungary
| | - Ádám Deák
- Doctoral School of Clinical Medicine, Faculty of Medicine, University of Debrecen, Nagyerdei St. 98, H-4032 Debrecen, Hungary
- Department of Operative Techniques and Surgical Research, Faculty of Medicine, University of Debrecen, Nagyerdei St. 98, H-4032 Debrecen, Hungary
| | - István Kertész
- Division of Nuclear Medicine and Translational Imaging, Department of Medical Imaging, Faculty of Medicine, University of Debrecen, Nagyerdei St. 98, H-4032 Debrecen, Hungary
| | - István Hajdu
- Division of Nuclear Medicine and Translational Imaging, Department of Medical Imaging, Faculty of Medicine, University of Debrecen, Nagyerdei St. 98, H-4032 Debrecen, Hungary
| | - György Trencsényi
- Division of Nuclear Medicine and Translational Imaging, Department of Medical Imaging, Faculty of Medicine, University of Debrecen, Nagyerdei St. 98, H-4032 Debrecen, Hungary
- Doctoral School of Clinical Medicine, Faculty of Medicine, University of Debrecen, Nagyerdei St. 98, H-4032 Debrecen, Hungary
- Gyula Petrányi Doctoral School of Clinical Immunology and Allergology, Faculty of Medicine, University of Debrecen, Nagyerdei St. 98, H-4032 Debrecen, Hungary
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Wiloch MZ, Baran N, Jonsson-Niedziolka M. The Influence of Coordination Mode on the Redox Properties of Copper Complexes with Aβ(3‐16) and its Pyroglutamate Counterpart pAβ(3‐16). ChemElectroChem 2022. [DOI: 10.1002/celc.202200623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Magdalena Z. Wiloch
- Institute of Physical Chemistry PAS: Polska Akademia Nauk Instytut Chemii Fizycznej Department of Electrode Processes POLAND
| | - Natalia Baran
- Institute of Physical Chemistry PAS: Polska Akademia Nauk Instytut Chemii Fizycznej Department of Electrode Processes POLAND
| | - Martin Jonsson-Niedziolka
- Institute of Physical Chemistry, PAS Department of electrode processes Kasprzaka 44/52 01-224 Warsaw POLAND
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Xu H, Jia C, Cheng C, Wu H, Cai H, Le W. Activation of autophagy attenuates motor deficits and extends lifespan in a C. elegans model of ALS. Free Radic Biol Med 2022; 181:52-61. [PMID: 35114355 PMCID: PMC8996503 DOI: 10.1016/j.freeradbiomed.2022.01.030] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 01/18/2022] [Accepted: 01/30/2022] [Indexed: 10/19/2022]
Abstract
Mutations in Cu/Zn-superoxide dismutase 1 (SOD1) are linked to amyotrophic lateral sclerosis (ALS). Using a line of ALS-related mutant human SOD1 (hSOD1) transgenic Caenorhabditis elegans, we determined the effects of metformin on the progression of ALS-like pathological abnormalities. We found that metformin significantly extended the lifespan, improved motor performance, and enhanced antioxidant activity of mutant worms. We further showed that metformin enhanced expression of lgg-1, daf-16, skn-1 and other genes known to regulate autophagy, longevity and oxidative stress in hSOD1 transgenic worms. Accordingly, overexpression of lgg-1 or daf-16 attenuated the aging and pathological abnormalities of mutant human SOD1 worms, while genetic deletion of lgg-1 or daf-16 abolished the beneficial effects of metformin. Collectively, we demonstrate that metformin protects against mutant SOD1-induced cytotoxicity in part through enhancement of autophagy and extends lifespan through daf-16 pathway. Our findings suggest that metformin could be further explored as a potential therapeutic agent in treating ALS.
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Affiliation(s)
- Hui Xu
- Liaoning Provincial Key Laboratory for Research on the Pathogenic Mechanisms of Neurological Diseases, The First Affiliated Hospital, Dalian Medical University, Dalian, 116021, China
| | - Congcong Jia
- Liaoning Provincial Key Laboratory for Research on the Pathogenic Mechanisms of Neurological Diseases, The First Affiliated Hospital, Dalian Medical University, Dalian, 116021, China
| | - Cheng Cheng
- Liaoning Provincial Key Laboratory for Research on the Pathogenic Mechanisms of Neurological Diseases, The First Affiliated Hospital, Dalian Medical University, Dalian, 116021, China
| | - Haifeng Wu
- Liaoning Provincial Key Laboratory for Research on the Pathogenic Mechanisms of Neurological Diseases, The First Affiliated Hospital, Dalian Medical University, Dalian, 116021, China
| | - Huaibin Cai
- Transgenic Section, Laboratory of Neurogenetics, National Institute on Aging (NIA), National Institutes of Health, Bethesda, MD, United States
| | - Weidong Le
- Liaoning Provincial Key Laboratory for Research on the Pathogenic Mechanisms of Neurological Diseases, The First Affiliated Hospital, Dalian Medical University, Dalian, 116021, China; Institute of Neurology, Sichuan Academy of Medical Sciences-Sichuan Provincial People's Hospital, Chengdu, 610072, China.
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11
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Neuropeptide signaling and SKN-1 orchestrate differential responses of the proteostasis network to dissimilar proteotoxic insults. Cell Rep 2022; 38:110350. [PMID: 35139369 DOI: 10.1016/j.celrep.2022.110350] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 11/15/2021] [Accepted: 01/19/2022] [Indexed: 01/01/2023] Open
Abstract
The protein homeostasis (proteostasis) network (PN) encompasses mechanisms that maintain proteome integrity by controlling various biological functions. Loss of proteostasis leads to toxic protein aggregation (proteotoxicity), which underlies the manifestation of neurodegeneration. How the PN responds to dissimilar proteotoxic challenges and how these responses are regulated at the organismal level are largely unknown. Here, we report that, while torsin chaperones protect from the toxicity of neurodegeneration-causing polyglutamine stretches, they exacerbate the toxicity of the Alzheimer's disease-causing Aβ peptide in neurons and muscles. These opposing effects are accompanied by differential modulations of gene expression, including that of three neuropeptides that are involved in tailoring the organismal response to dissimilar proteotoxic insults. This mechanism is regulated by insulin/IGF signaling and the transcription factor SKN-1/NRF. Our work delineates a mechanism by which the PN orchestrates differential responses to dissimilar proteotoxic challenges and points at potential targets for therapeutic interventions.
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12
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Modeling Alzheimer's Disease in Caenorhabditis elegans. Biomedicines 2022; 10:biomedicines10020288. [PMID: 35203497 PMCID: PMC8869312 DOI: 10.3390/biomedicines10020288] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 01/18/2022] [Accepted: 01/24/2022] [Indexed: 02/04/2023] Open
Abstract
Alzheimer’s disease (AD) is the most frequent cause of dementia. After decades of research, we know the importance of the accumulation of protein aggregates such as β-amyloid peptide and phosphorylated tau. We also know that mutations in certain proteins generate early-onset Alzheimer’s disease (EOAD), and many other genes modulate the disease in its sporadic form. However, the precise molecular mechanisms underlying AD pathology are still unclear. Because of ethical limitations, we need to use animal models to investigate these processes. The nematode Caenorhabditis elegans has received considerable attention in the last 25 years, since the first AD models overexpressing Aβ peptide were described. We review here the main results obtained using this model to study AD. We include works studying the basic molecular mechanisms of the disease, as well as those searching for new therapeutic targets. Although this model also has important limitations, the ability of this nematode to generate knock-out or overexpression models of any gene, single or combined, and to carry out toxicity, recovery or survival studies in short timeframes with many individuals and at low cost is difficult to overcome. We can predict that its use as a model for various diseases will certainly continue to increase.
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13
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Ahmad W, Ebert PR. Suppression of a core metabolic enzyme dihydrolipoamide dehydrogenase ( dld) protects against amyloid beta toxicity in C. elegans model of Alzheimer's disease. Genes Dis 2021; 8:849-866. [PMID: 34522713 PMCID: PMC8427249 DOI: 10.1016/j.gendis.2020.08.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 07/24/2020] [Accepted: 08/14/2020] [Indexed: 01/24/2023] Open
Abstract
A decrease in energy metabolism is associated with Alzheimer's disease (AD), but it is not known whether the observed decrease exacerbates or protects against the disease. The importance of energy metabolism in AD is reinforced by the observation that variants of dihydrolipoamide dehydrogenase (DLD), is genetically linked to late-onset AD. To determine whether DLD is a suitable therapeutic target, we suppressed the dld-1 gene in Caenorhabditis elegans that express human Aβ peptide in either muscles or neurons. Suppression of the dld-1 gene resulted in significant restoration of vitality and function that had been degraded by Aβ pathology. This included protection of neurons and muscles cells. The observed decrease in proteotoxicity was associated with a decrease in the formation of toxic oligomers rather than a decrease in the abundance of the Aβ peptide. The mitochondrial uncoupler, carbonyl cyanide 4-(trifluoromethoxy) phenylhydrazone (FCCP), which like dld-1 gene expression inhibits ATP synthesis, had no significant effect on Aβ toxicity. Proteomics data analysis revealed that beneficial effects after dld-1 suppression could be due to change in energy metabolism and activation of the pathways associated with proteasomal degradation, improved cell signaling and longevity. Thus, some features unique to dld-1 gene suppression are responsible for the therapeutic benefit. By direct genetic intervention, we have shown that acute inhibition of dld-1 gene function may be therapeutically beneficial. This result supports the hypothesis that lowering energy metabolism protects against Aβ pathogenicity and that DLD warrants further investigation as a therapeutic target.
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Affiliation(s)
- Waqar Ahmad
- School of Biological Sciences, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Paul R. Ebert
- School of Biological Sciences, The University of Queensland, Brisbane, QLD 4072, Australia
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14
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Tangrodchanapong T, Sornkaew N, Yurasakpong L, Niamnont N, Nantasenamat C, Sobhon P, Meemon K. Beneficial Effects of Cyclic Ether 2-Butoxytetrahydrofuran from Sea Cucumber Holothuria scabra against Aβ Aggregate Toxicity in Transgenic Caenorhabditis elegans and Potential Chemical Interaction. Molecules 2021; 26:molecules26082195. [PMID: 33920352 PMCID: PMC8070609 DOI: 10.3390/molecules26082195] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Revised: 04/04/2021] [Accepted: 04/07/2021] [Indexed: 12/24/2022] Open
Abstract
The pathological finding of amyloid-β (Aβ) aggregates is thought to be a leading cause of untreated Alzheimer’s disease (AD). In this study, we isolated 2-butoxytetrahydrofuran (2-BTHF), a small cyclic ether, from Holothuria scabra and demonstrated its therapeutic potential against AD through the attenuation of Aβ aggregation in a transgenic Caenorhabditis elegans model. Our results revealed that amongst the five H. scabra isolated compounds, 2-BTHF was shown to be the most effective in suppressing worm paralysis caused by Aβ toxicity and in expressing strong neuroprotection in CL4176 and CL2355 strains, respectively. An immunoblot analysis showed that CL4176 and CL2006 treated with 2-BTHF showed no effect on the level of Aβ monomers but significantly reduced the toxic oligomeric form and the amount of 1,4-bis(3-carboxy-hydroxy-phenylethenyl)-benzene (X-34)-positive fibril deposits. This concurrently occurred with a reduction of reactive oxygen species (ROS) in the treated CL4176 worms. Mechanistically, heat shock factor 1 (HSF-1) (at residues histidine 63 (HIS63) and glutamine 72 (GLN72)) was shown to be 2-BTHF’s potential target that might contribute to an increased expression of autophagy-related genes required for the breakdown of the Aβ aggregate, thus attenuating its toxicity. In conclusion, 2-BTHF from H. scabra could protect C. elegans from Aβ toxicity by suppressing its aggregation via an HSF-1-regulated autophagic pathway and has been implicated as a potential drug for AD.
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Affiliation(s)
- Taweesak Tangrodchanapong
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok 10400, Thailand; (T.T.); (L.Y.); (P.S.)
| | - Nilubon Sornkaew
- Department of Chemistry, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand; (N.S.); (N.N.)
| | - Laphatrada Yurasakpong
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok 10400, Thailand; (T.T.); (L.Y.); (P.S.)
| | - Nakorn Niamnont
- Department of Chemistry, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand; (N.S.); (N.N.)
| | - Chanin Nantasenamat
- Center of Data Mining and Biomedical Informatics, Faculty of Medical Technology, Mahidol University, Bangkok 10700, Thailand;
| | - Prasert Sobhon
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok 10400, Thailand; (T.T.); (L.Y.); (P.S.)
| | - Krai Meemon
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok 10400, Thailand; (T.T.); (L.Y.); (P.S.)
- Correspondence: or ; Tel.: +66-22-015-407
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15
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Retinal hyperspectral imaging in the 5xFAD mouse model of Alzheimer's disease. Sci Rep 2021; 11:6387. [PMID: 33737550 PMCID: PMC7973540 DOI: 10.1038/s41598-021-85554-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Accepted: 02/20/2021] [Indexed: 11/08/2022] Open
Abstract
Hyperspectral imaging of the retina has recently been posited as a potentially useful form of spectroscopy of amyloid-beta (Aβ) protein in the eyes of those with Alzheimer's disease (AD). The concept of using the retina as a biomarker for AD is an attractive one, as current screening tools for AD are either expensive or inaccessible. Recent studies have investigated hyperspectral imaging in Aβ models however these studies have been in younger mice. Here we characterised hyperspectral reflectance profile in 6 to 17 months old 5xFAD mice and compare this to Aβ in isolated preparations. Hyperspectral imaging was conducted across two preparations of Aβ using a custom built bench ophthalmoscope. In the in vitro condition, 1 mg of purified human Aβ42 was solubilised and left to aggregate for 72 h. This soluble/insoluble Aβ mixture was then imaged by suspending the solution at a pipette tip and compared against phosphate buffered saline (PBS) control (n = 10 ROIs / group). In the in vivo condition, a 5xFAD transgenic mouse model was used and retinae were imaged at the age of 6 (n = 9), 12 (n = 9) and 17 months (n = 8) with age matched wildtype littermates as control (n = 12, n = 13, n = 15 respectively). In the vitro condition, hyperspectral imaging of the solution showed greater reflectance compared with vehicle (p < 0.01), with the greatest differences occurring in the short visible spectrum (< 500 nm). In the in vivo preparation, 5xFAD showed greater hyperspectral reflectance at all ages (6, 12, 17 months, p < 0.01). These differences were noted most in the short wavelengths at younger ages, with an additional peak appearing at longer wavelengths (~ 550 nm) with advancing age. This study shows that the presence of Aβ (soluble/insoluble mixture) can increase the hyperspectral reflectance profile in vitro as well as in vivo. Differences were evident in the short wavelength spectrum (< 500 nm) in vitro and were preserved when imaged through the ocular media in the in vivo conditions. With advancing age a second hump around ~ 550 nm became more apparent. Hyperspectral imaging of the retina does not require the use of contrast agents and is a potentially useful and non-invasive biomarker for AD.
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Lin C, Zhang X, Zhuang C, Lin Y, Cao Y, Chen Y. Healthspan Improvements in Caenorhabditis elegans with Traditional Chinese Herbal Tea. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2020; 2020:4057841. [PMID: 33488924 PMCID: PMC7787765 DOI: 10.1155/2020/4057841] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 11/15/2020] [Accepted: 11/29/2020] [Indexed: 11/18/2022]
Abstract
Searching for natural and safe herbal tea with health benefits has attracted more and more attention, which is of great significance for reducing disease risk. A Chinese traditional herbal tea (HT) is rich in active ingredients extracted from natural plants. Numerous pharmacological studies showed that HT had the potential to improve health, including antidepression and antioxidant effects. In this study, we proposed a strategy to explore the role and underlying mechanism of HT in improving healthspan of a Caenorhabditis elegans model. First, we found that HT significantly prolonged the lifespan without reducing fertility in worms. Second, stress resistance (oxidative stress and heat stress) was enhanced and Aβ- and polyQ-induced toxicity was relieved significantly by HT treatment. Both fat deposition and age pigment accumulation were found to be significantly reduced in HT-treated worms. The locomotion in mid-late stages was improved, indicating that behavioral mobility was also significantly enhanced. Furthermore, the main components of HT were eighteen polyphenols and two terpenoids. Finally, it was found that this protective mechanism was positively correlated with the insulin/insulin-like growth factor signaling- (IIS-) dependent manner, which went through promoting the nuclear localization of DAF-16 and its downstream SOD-3 expression. These results suggested that HT had an important role in improving health, which might serve as a promising healthy tea.
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Affiliation(s)
- Chunxiu Lin
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, Guangdong, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642 Guangdong, China
| | - Xiaoying Zhang
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, Guangdong, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642 Guangdong, China
| | - Chuting Zhuang
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, Guangdong, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642 Guangdong, China
| | - Yugui Lin
- Department of Microbiology, Guangxi Medical University, Nanning, China
| | - Yong Cao
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, Guangdong, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642 Guangdong, China
| | - Yunjiao Chen
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, Guangdong, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642 Guangdong, China
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17
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Paul D, Chipurupalli S, Justin A, Raja K, Mohankumar SK. Caenorhabditis elegans as a possible model to screen anti-Alzheimer's therapeutics. J Pharmacol Toxicol Methods 2020; 106:106932. [PMID: 33091537 DOI: 10.1016/j.vascn.2020.106932] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 09/28/2020] [Accepted: 09/29/2020] [Indexed: 01/06/2023]
Abstract
Alzheimer's disease (AD) is regarded as one of the significant health burdens, as the prevalence is raising worldwide and gradually reaching to epidemic proportions. Consequently, a number of scientific investigations have been initiated to derive therapeutics to combat AD with a concurrent advancement in pharmacological methods and experimental models. Whilst, the available experimental pharmacological approaches both in vivo and in vitro led to the development of AD therapeutics, the precise manner by which experimental models mimic either one or more biomarkers of human pathology of AD is gaining scientific attentions. Caenorhabditis elegans (C. elegans) has been regarded as an emerging model for various reasons, including its high similarities with the biomarkers of human AD. Our review supports the versatile nature of C. elegans and collates that it is a well-suited model to elucidate various molecular mechanisms by which AD therapeutics elicit their pharmacological effects. It is apparent that C. elegans is capable of establishing the pathological processes that links the endoplasmic reticulum and mitochondria dysfunctions in AD, exploring novel molecular cascades of AD pathogenesis and underpinning causal and consequential changes in the associated proteins and genes. In summary, C. elegans is a unique and feasible model for the screening of anti-Alzheimer's therapeutics and has the potential for further scientific exploration.
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Affiliation(s)
- Deepraj Paul
- TIFAC CORE in Herbal Drugs, Department of Pharmacognosy, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Rockland's, Ooty 643001, Tamil Nadu, India
| | - Sandhya Chipurupalli
- Department of Pharmacology, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Rockland's, Ooty 643001, Tamil Nadu, India
| | - Antony Justin
- Department of Pharmacology, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Rockland's, Ooty 643001, Tamil Nadu, India
| | - Kalpana Raja
- Regenerative Biology, Morgridge Institute of Research, Madison, WI, USA
| | - Suresh K Mohankumar
- TIFAC CORE in Herbal Drugs, Department of Pharmacognosy, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Rockland's, Ooty 643001, Tamil Nadu, India.
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18
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Gallrein C, Iburg M, Michelberger T, Koçak A, Puchkov D, Liu F, Ayala Mariscal SM, Nayak T, Kaminski Schierle GS, Kirstein J. Novel amyloid-beta pathology C. elegans model reveals distinct neurons as seeds of pathogenicity. Prog Neurobiol 2020; 198:101907. [PMID: 32926945 DOI: 10.1016/j.pneurobio.2020.101907] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Revised: 07/28/2020] [Accepted: 09/01/2020] [Indexed: 11/30/2022]
Abstract
Protein misfolding and aggregation are hallmarks of neurodegenerative diseases such as Alzheimer's disease (AD). In AD, the accumulation and aggregation of tau and the amyloid-beta peptide Aβ1-42 precedes the onset of AD symptoms. Modelling the aggregation of Aβ is technically very challenging in vivo due to its size of only 42 aa. Here, we employed sub-stoichiometric labelling of Aβ1-42 in C. elegans to enable tracking of the peptide in vivo, combined with the "native" aggregation of unlabeled Aβ1-42. Expression of Aβ1-42 leads to severe physiological defects, neuronal dysfunction and neurodegeneration. Moreover, we can demonstrate spreading of neuronal Aβ to other tissues. Fluorescence lifetime imaging microscopy enabled a quantification of the formation of amyloid fibrils with ageing and revealed a heterogenic yet specific pattern of aggregation. Notably, we found that Aβ aggregation starts in a subset of neurons of the anterior head ganglion, the six IL2 neurons. We further demonstrate that cell-specific, RNAi-mediated depletion of Aβ in these IL2 neurons systemically delays Aβ aggregation and pathology.
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Affiliation(s)
- Christian Gallrein
- Leibniz Research Institute for Molecular Pharmacology im Forschungsverbund Berlin e.V., R.-Roessle-Strasse 10, Berlin, 13125, Germany
| | - Manuel Iburg
- Leibniz Research Institute for Molecular Pharmacology im Forschungsverbund Berlin e.V., R.-Roessle-Strasse 10, Berlin, 13125, Germany
| | - Tim Michelberger
- Leibniz Research Institute for Molecular Pharmacology im Forschungsverbund Berlin e.V., R.-Roessle-Strasse 10, Berlin, 13125, Germany
| | - Alen Koçak
- Leibniz Research Institute for Molecular Pharmacology im Forschungsverbund Berlin e.V., R.-Roessle-Strasse 10, Berlin, 13125, Germany
| | - Dmytro Puchkov
- Leibniz Research Institute for Molecular Pharmacology im Forschungsverbund Berlin e.V., R.-Roessle-Strasse 10, Berlin, 13125, Germany
| | - Fan Liu
- Leibniz Research Institute for Molecular Pharmacology im Forschungsverbund Berlin e.V., R.-Roessle-Strasse 10, Berlin, 13125, Germany
| | - Sara Maria Ayala Mariscal
- Leibniz Research Institute for Molecular Pharmacology im Forschungsverbund Berlin e.V., R.-Roessle-Strasse 10, Berlin, 13125, Germany
| | - Tanmoyita Nayak
- University of Bremen, Faculty 2, Cell Biology, Leobener Strasse, 28359, Bremen, Germany
| | - Gabriele S Kaminski Schierle
- Molecular Neuroscience Group, Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, UK
| | - Janine Kirstein
- Leibniz Research Institute for Molecular Pharmacology im Forschungsverbund Berlin e.V., R.-Roessle-Strasse 10, Berlin, 13125, Germany; University of Bremen, Faculty 2, Cell Biology, Leobener Strasse, 28359, Bremen, Germany.
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19
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Tangrodchanapong T, Sobhon P, Meemon K. Frondoside A Attenuates Amyloid-β Proteotoxicity in Transgenic Caenorhabditis elegans by Suppressing Its Formation. Front Pharmacol 2020; 11:553579. [PMID: 33013392 PMCID: PMC7513805 DOI: 10.3389/fphar.2020.553579] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Accepted: 08/24/2020] [Indexed: 11/16/2022] Open
Abstract
Oligomeric assembly of Amyloid-β (Aβ) is the main toxic species that contribute to early cognitive impairment in Alzheimer’s patients. Therefore, drugs that reduce the formation of Aβ oligomers could halt the disease progression. In this study, by using transgenic Caenorhabditis elegans model of Alzheimer’s disease, we investigated the effects of frondoside A, a well-known sea cucumber Cucumaria frondosa saponin with anti-cancer activity, on Aβ aggregation and proteotoxicity. The results showed that frondoside A at a low concentration of 1 µM significantly delayed the worm paralysis caused by Aβ aggregation as compared with control group. In addition, the number of Aβ plaque deposits in transgenic worm tissues was significantly decreased. Frondoside A was more effective in these activities than ginsenoside-Rg3, a comparable ginseng saponin. Immunoblot analysis revealed that the level of small oligomers as well as various high molecular weights of Aβ species in the transgenic C. elegans were significantly reduced upon treatment with frondoside A, whereas the level of Aβ monomers was not altered. This suggested that frondoside A may primarily reduce the level of small oligomeric forms, the most toxic species of Aβ. Frondoside A also protected the worms from oxidative stress and rescued chemotaxis dysfunction in a transgenic strain whose neurons express Aβ. Taken together, these data suggested that low dose of frondoside A could protect against Aβ-induced toxicity by primarily suppressing the formation of Aβ oligomers. Thus, the molecular mechanism of how frondoside A exerts its anti-Aβ aggregation should be studied and elucidated in the future.
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Affiliation(s)
| | - Prasert Sobhon
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Krai Meemon
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok, Thailand
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20
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Liang JJH, McKinnon IA, Rankin CH. The contribution of C. elegans neurogenetics to understanding neurodegenerative diseases. J Neurogenet 2020; 34:527-548. [DOI: 10.1080/01677063.2020.1803302] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Joseph J. H. Liang
- Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, Canada
| | - Issa A. McKinnon
- Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, Canada
| | - Catharine H. Rankin
- Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, Canada
- Department of Psychology, University of British Columbia, Vancouver, Canada
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21
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Abstract
Sustaining a healthy proteome is a lifelong challenge for each individual cell of an organism. However, protein homeostasis or proteostasis is constantly jeopardized since damaged proteins accumulate under proteotoxic stress that originates from ever-changing metabolic, environmental, and pathological conditions. Proteostasis is achieved via a conserved network of quality control pathways that orchestrate the biogenesis of correctly folded proteins, prevent proteins from misfolding, and remove potentially harmful proteins by selective degradation. Nevertheless, the proteostasis network has a limited capacity and its collapse deteriorates cellular functionality and organismal viability, causing metabolic, oncological, or neurodegenerative disorders. While cell-autonomous quality control mechanisms have been described intensely, recent work on Caenorhabditis elegans has demonstrated the systemic coordination of proteostasis between distinct tissues of an organism. These findings indicate the existence of intricately balanced proteostasis networks important for integration and maintenance of the organismal proteome, opening a new door to define novel therapeutic targets for protein aggregation diseases. Here, we provide an overview of individual protein quality control pathways and the systemic coordination between central proteostatic nodes. We further provide insights into the dynamic regulation of cellular and organismal proteostasis mechanisms that integrate environmental and metabolic changes. The use of C. elegans as a model has pioneered our understanding of conserved quality control mechanisms important to safeguard the organismal proteome in health and disease.
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Affiliation(s)
- Thorsten Hoppe
- Institute for Genetics and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD) and
- Center for Molecular Medicine Cologne (CMMC), University of Cologne, Cologne 50931, Germany and
| | - Ehud Cohen
- Department of Biochemistry and Molecular Biology, the Institute for Medical Research Israel-Canada (IMRIC), the Hebrew University School of Medicine, Jerusalem 91120, Israel
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22
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Van Pelt KM, Truttmann MC. Caenorhabditis elegans as a model system for studying aging-associated neurodegenerative diseases. TRANSLATIONAL MEDICINE OF AGING 2020; 4:60-72. [PMID: 34327290 PMCID: PMC8317484 DOI: 10.1016/j.tma.2020.05.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Neurodegenerative diseases (NDs) are a heterogeneous group of aging-associated disorders characterized by the disruption of cellular proteostasis machinery and the misfolding of distinct protein species to form toxic aggregates in neurons. The increasing prevalence of NDs represents a growing healthcare burden worldwide, a concern compounded by the fact that few, if any, treatments exist to target the underlying cause of these diseases. Consequently, the application of a high-throughput, physiologically relevant model system to studies dissecting the molecular mechanisms governing ND pathology is crucial for identifying novel avenues for the development of targeted therapeutics. The nematode Caenorhabditis elegans (C. elegans) has emerged as a powerful tool for the study of disease mechanisms due to its ease of genetic manipulation and swift cultivation, while providing a whole-animal system amendable to numerous molecular and biochemical techniques. To date, numerous C. elegans models have been generated for a variety of NDs, allowing for the large-scale in vivo study of protein-conformation disorders. Furthermore, the comparatively low barriers to entry in the development of transgenic worm models have facilitated the modeling of rare or "orphan" NDs, thereby providing unparalleled insight into the shared mechanisms underlying these pathologies. In this review, we summarize findings from a comprehensive collection of C. elegans neurodegenerative disease models of varying prevalence to emphasize shared mechanisms of proteotoxicity, and highlight the utility of these models in elucidating the molecular basis of ND pathologies.
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Affiliation(s)
- Kate M. Van Pelt
- Cellular & Molecular Biology Program, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Matthias C. Truttmann
- Cellular & Molecular Biology Program, University of Michigan, Ann Arbor, MI, 48109, USA
- Department of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, MI, 48109, USA
- Geriatrics Center, University of Michigan, Ann Arbor, MI, 48109, USA
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23
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Biophysical studies of protein misfolding and aggregation in in vivo models of Alzheimer's and Parkinson's diseases. Q Rev Biophys 2020; 49:e22. [PMID: 32493529 DOI: 10.1017/s0033583520000025] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Neurodegenerative disorders, including Alzheimer's (AD) and Parkinson's diseases (PD), are characterised by the formation of aberrant assemblies of misfolded proteins. The discovery of disease-modifying drugs for these disorders is challenging, in part because we still have a limited understanding of their molecular origins. In this review, we discuss how biophysical approaches can help explain the formation of the aberrant conformational states of proteins whose neurotoxic effects underlie these diseases. We discuss in particular models based on the transgenic expression of amyloid-β (Aβ) and tau in AD, and α-synuclein in PD. Because biophysical methods have enabled an accurate quantification and a detailed understanding of the molecular mechanisms underlying protein misfolding and aggregation in vitro, we expect that the further development of these methods to probe directly the corresponding mechanisms in vivo will open effective routes for diagnostic and therapeutic interventions.
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24
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Cogliati S, Clementi V, Francisco M, Crespo C, Argañaraz F, Grau R. Bacillus Subtilis Delays Neurodegeneration and Behavioral Impairment in the Alzheimer’s Disease Model Caenorhabditis Elegans. J Alzheimers Dis 2020; 73:1035-1052. [DOI: 10.3233/jad-190837] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Sebastián Cogliati
- Departamento de Microbiología, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, CONICET – Rosario, Argentina
| | - Victoria Clementi
- Departamento de Microbiología, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, CONICET – Rosario, Argentina
| | - Marcos Francisco
- Departamento de Microbiología, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, CONICET – Rosario, Argentina
| | - Cira Crespo
- Departamento de Microbiología, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, CONICET – Rosario, Argentina
| | - Federico Argañaraz
- Departamento de Microbiología, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, CONICET – Rosario, Argentina
| | - Roberto Grau
- Departamento de Microbiología, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, CONICET – Rosario, Argentina
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Markaki M, Tavernarakis N. Caenorhabditis elegans as a model system for human diseases. Curr Opin Biotechnol 2020; 63:118-125. [PMID: 31951916 DOI: 10.1016/j.copbio.2019.12.011] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 12/08/2019] [Accepted: 12/11/2019] [Indexed: 01/23/2023]
Abstract
The nematode Caenorhabditis elegans offers unique advantages that enable a comprehensive delineation of the cellular and molecular mechanisms underlying devastating human pathologies such as stroke, ischemia and age-associated neurodegenerative disorders. Genetic models of human diseases that closely simulate several disease-related phenotypes have been established in the worm. These models allow the implementation of multidisciplinary approaches, in addition to large-scale genetic and pharmacological screenings, designed to elucidate the molecular mechanisms mediating pathogenesis and to identify targets and drugs for emergent therapeutic interventions. Such strategies have already provided valuable insights, highly relevant to human health and quality of life. This article considers the potential of C. elegans as a versatile platform for systematic dissection of the molecular basis of human disease, focusing on neurodegenerative disorders.
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Affiliation(s)
- Maria Markaki
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, Heraklion 70013, Crete, Greece
| | - Nektarios Tavernarakis
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, Heraklion 70013, Crete, Greece; Department of Basic Sciences, School of Medicine, University of Crete, Heraklion 70013, Crete, Greece.
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26
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Yang T, Zhu Z, Yin E, Wang Y, Zhang C, Yuan H, Zhang H, Jin S, Guo Z, Wang X. Alleviation of symptoms of Alzheimer's disease by diminishing Aβ neurotoxicity and neuroinflammation. Chem Sci 2019; 10:10149-10158. [PMID: 32055369 PMCID: PMC6979322 DOI: 10.1039/c9sc03042e] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Accepted: 09/16/2019] [Indexed: 01/22/2023] Open
Abstract
Alzheimer's disease (AD) is one of the most prevailing neurodegenerative illnesses in the elderly. Accumulation of amyloid-β peptide (Aβ) and inflammation play critical roles in the pathogenesis and development of AD. Multi-target drugs may interdict the progress of AD through a synergistic mechanism. A neuromodulator, 2-((1H-benzo[d]imidazole-2-yl)methoxy)benzoic acid (BIBA), consisting of an Aβ-targeting group and a derivative of anti-inflammatory aspirin was designed as a potential anti-AD agent. BIBA exhibits a remarkable inhibitory effect on the self- and metal-induced Aβ aggregations and shows outstanding anti-inflammatory activity simultaneously. The neurotoxicity of Aβ aggregates is attenuated, and the production of pro-inflammatory cytokines (PICs), such as IL-6, IL-1β and TNF-α, in microglia stimulated by lipopolysaccharide (LPS) or Aβ is reduced. Owing to the synergy between the inhibition of Aβ oligomerization and downregulation of PICs, BIBA markedly prolongs the lifespan and relieves the Aβ-induced paralysis of Aβ-transgenic Caenorhabditis elegans, thus showing the potential to ameliorate the symptoms of AD through inhibiting Aβ neurotoxicity and deactivating microglia. These findings demonstrate that both Aβ aggregation and neuroinflammation are therapeutic targets for anti-AD drugs, and dual-functional agents that integrate anti-Aβ and anti-inflammatory capabilities have great advantages over the traditional single-target agents for AD treatment.
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Affiliation(s)
- Tao Yang
- State Key Laboratory of Pharmaceutical Biotechnology , School of Life Sciences , Nanjing University , Nanjing 210023 , P. R. China .
| | - Zhenzhu Zhu
- State Key Laboratory of Pharmaceutical Biotechnology , School of Life Sciences , Nanjing University , Nanjing 210023 , P. R. China .
| | - Enmao Yin
- State Key Laboratory of Pharmaceutical Biotechnology , School of Life Sciences , Nanjing University , Nanjing 210023 , P. R. China .
| | - Yanqing Wang
- School of Chemistry and Chemical Engineering , Yancheng Teachers University , Yancheng 224002 , P. R. China
| | - Changli Zhang
- Department of Chemistry , Nanjing Xiaozhuang College , Nanjing , 210017 , P. R. China
| | - Hao Yuan
- State Key Laboratory of Coordination Chemistry , School of Chemistry and Chemical Engineering , Nanjing University , Nanjing 210023 , P. R. China
| | - Hongmei Zhang
- State Key Laboratory of Pharmaceutical Biotechnology , School of Life Sciences , Nanjing University , Nanjing 210023 , P. R. China .
| | - Suxing Jin
- State Key Laboratory of Pharmaceutical Biotechnology , School of Life Sciences , Nanjing University , Nanjing 210023 , P. R. China .
| | - Zijian Guo
- State Key Laboratory of Coordination Chemistry , School of Chemistry and Chemical Engineering , Nanjing University , Nanjing 210023 , P. R. China
| | - Xiaoyong Wang
- State Key Laboratory of Pharmaceutical Biotechnology , School of Life Sciences , Nanjing University , Nanjing 210023 , P. R. China .
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Imanikia S, Özbey NP, Krueger C, Casanueva MO, Taylor RC. Neuronal XBP-1 Activates Intestinal Lysosomes to Improve Proteostasis in C. elegans. Curr Biol 2019; 29:2322-2338.e7. [PMID: 31303493 PMCID: PMC6658570 DOI: 10.1016/j.cub.2019.06.031] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 05/02/2019] [Accepted: 06/10/2019] [Indexed: 12/22/2022]
Abstract
The unfolded protein response of the endoplasmic reticulum (UPRER) is a crucial mediator of secretory pathway homeostasis. Expression of the spliced and active form of the UPRER transcription factor XBP-1, XBP-1s, in the nervous system triggers activation of the UPRER in the intestine of Caenorhabditis elegans (C. elegans) through release of a secreted signal, leading to increased longevity. We find that expression of XBP-1s in the neurons or intestine of the worm strikingly improves proteostasis in multiple tissues, through increased clearance of toxic proteins. To identify the mechanisms behind this enhanced proteostasis, we conducted intestine-specific RNA-seq analysis to identify genes upregulated in the intestine when XBP-1s is expressed in neurons. This revealed that neuronal XBP-1s increases the expression of genes involved in lysosome function. Lysosomes in the intestine of animals expressing neuronal XBP-1s are more acidic, and lysosomal protease activity is higher. Moreover, intestinal lysosome function is necessary for enhanced lifespan and proteostasis. These findings suggest that activation of the UPRER in the intestine through neuronal signaling can increase the activity of lysosomes, leading to extended longevity and improved proteostasis across tissues. Xbp-1s expressed in the neurons or intestine of C. elegans improves proteostasis Neuronal xbp-1s drives expression of lysosomal genes in the intestine Intestinal lysosomes show enhanced acidity and activity upon xbp-1s expression Lysosome function is required for xbp-1s to increase proteostasis and longevity
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Affiliation(s)
- Soudabeh Imanikia
- Neurobiology Division, MRC Laboratory of Molecular Biology, Cambridge CB2 0QH, UK
| | - Neşem P Özbey
- Neurobiology Division, MRC Laboratory of Molecular Biology, Cambridge CB2 0QH, UK
| | - Christel Krueger
- Epigenetics Programme, The Babraham Institute, Babraham CB22 3AT, UK
| | | | - Rebecca C Taylor
- Neurobiology Division, MRC Laboratory of Molecular Biology, Cambridge CB2 0QH, UK.
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Alzheimer's Disease and Sleep-Wake Disturbances: Amyloid, Astrocytes, and Animal Models. J Neurosci 2019; 38:2901-2910. [PMID: 29563238 DOI: 10.1523/jneurosci.1135-17.2017] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Revised: 09/21/2017] [Accepted: 10/18/2017] [Indexed: 01/24/2023] Open
Abstract
Sleep-wake abnormalities are common in patients with Alzheimer's disease, and can be a major reason for institutionalization. However, an emerging concept is that these sleep-wake disturbances are part of the causal pathway accelerating the neurodegenerative process. Recently, new findings have provided intriguing evidence for a positive feedback loop between sleep-wake dysfunction and β-amyloid (Aβ) aggregation. Studies in both humans and animal models have shown that extended periods of wakefulness increase Aβ levels and aggregation, and accumulation of Aβ causes fragmentation of sleep. This perspective is aimed at presenting evidence supporting causal links between sleep-wake dysfunction and aggregation of Aβ peptide in Alzheimer's disease, and explores the role of astrocytes, a specialized type of glial cell, in this context underlying Alzheimer's disease pathology. The utility of current animal models and the unexplored potential of alternative animal models for testing mechanisms involved in the reciprocal relationship between sleep disruption and Aβ are also discussed.Dual Perspectives Companion Paper: Microglia-Mediated Synapse Loss in Alzheimer's Disease by Lawrence Rajendran and Rosa Paolicelli.
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Cheah IK, Ng LT, Ng LF, Lam VY, Gruber J, Huang CYW, Goh FQ, Lim KHC, Halliwell B. Inhibition of amyloid-induced toxicity by ergothioneine in a transgenic Caenorhabditis elegans model. FEBS Lett 2019; 593:2139-2150. [PMID: 31211853 DOI: 10.1002/1873-3468.13497] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 06/13/2019] [Accepted: 06/13/2019] [Indexed: 12/26/2022]
Abstract
The abnormal accumulation of β-amyloid peptide (Aβ) is recognized as a central component in the pathogenesis of Alzheimer disease. While many aspects of Aβ-mediated neurotoxicity remain elusive, Aβ has been associated with numerous underlying pathologies, including oxidative and nitrosative stress, inflammation, metal ion imbalance, mitochondrial dysfunction, and even tau pathology. Ergothioneine (ET), a naturally occurring thiol/thione-derivative of histidine, has demonstrated antioxidant and neuroprotective properties against various oxidative and neurotoxic stressors. This study investigates ET's potential to counteract Aβ-toxicity in transgenic Caenorhabditis elegans overexpressing a human Aβ peptide. The accumulation of Aβ in this model leads to paralysis and premature death. We show that ET dose-dependently reduces Aβ-oligomerization and extends the lifespan and healthspan of the nematodes.
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Affiliation(s)
- Irwin K Cheah
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
- Life Science Institute, Neurobiology Programme, Centre for Life Sciences, National University of Singapore, Singapore
| | - Li-Theng Ng
- Life Science Institute, Neurobiology Programme, Centre for Life Sciences, National University of Singapore, Singapore
- Yale-NUS College, Singapore
| | | | - Vanessa Y Lam
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
- Life Science Institute, Neurobiology Programme, Centre for Life Sciences, National University of Singapore, Singapore
| | - Jan Gruber
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
- Yale-NUS College, Singapore
| | - Cheryl Y W Huang
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Fang-Qin Goh
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Keith H C Lim
- Department of Radiation Oncology, National University Health System, National University Cancer Institute Singapore, Singapore
| | - Barry Halliwell
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
- Life Science Institute, Neurobiology Programme, Centre for Life Sciences, National University of Singapore, Singapore
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Xu J, Yuan Y, Zhang R, Song Y, Sui T, Wang J, Wang C, Chen Y, Guan S, Wang L. A deuterohemin peptide protects a transgenic Caenorhabditis elegans model of Alzheimer’s disease by inhibiting Aβ1–42 aggregation. Bioorg Chem 2019; 82:332-339. [DOI: 10.1016/j.bioorg.2018.10.072] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 10/27/2018] [Accepted: 10/31/2018] [Indexed: 01/05/2023]
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31
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Koch K, Weldle N, Baier S, Büchter C, Wätjen W. Hibiscus sabdariffa L. extract prolongs lifespan and protects against amyloid-β toxicity in Caenorhabditis elegans: involvement of the FoxO and Nrf2 orthologues DAF-16 and SKN-1. Eur J Nutr 2019; 59:137-150. [PMID: 30710163 DOI: 10.1007/s00394-019-01894-w] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Accepted: 01/05/2019] [Indexed: 12/12/2022]
Abstract
PURPOSE Hibiscus sabdariffa L. is commonly used as an ingredient for herbal teas and food supplements. Several studies demonstrated the beneficial effects of Hibiscus sabdariffa L. extracts (HSE); however, the bioactive components and their mode of action still remain unclear. Caenorhabditis elegans (C. elegans) was used to study health-related effects and the underlying molecular mechanisms of HSE in this model organism as well as effects of hydroxycitric acid (HCA), a main compound of HSE, and its structural analogue isocitric acid (ICA). METHODS Survival and locomotion were detected by touch-provoked movement. Thermotolerance was analysed using the nucleic acid stain SYTOX green, and intracellular ROS accumulation was measured via oxidation of H2DCF. Localisation of the transcription factors DAF-16 and SKN-1 was analysed in transgenic strains (DAF-16::GFP, SKN-1::GFP). The involvement of DAF-16 and SKN-1 was further investigated using loss-of-function strains as well as gene silencing by feeding RNAi-inducing bacteria. Protection against amyloid-β toxicity was analysed using a transgenic strain with an inducible expression of human amyloid-β peptides in body wall muscle cells (paralysis assay). RESULTS HSE treatment resulted in a prominent extension of lifespan (up to 24%) and a reduction of the age-dependent decline in locomotion. HCA, a main compound of HSE increased lifespan too, but to a lesser extent (6%) while ICA was not effective. HSE and HCA did not modulate resistance against thermal stress conditions and did not exert antioxidative effects: HSE rather increased intracellular ROS levels, suggesting a pro-oxidative effect of the extract in vivo. HSE and HCA increased the nuclear localisation of the pivotal transcription factors DAF-16 and SKN-1 indicating an activation of these factors. Consistent with this result, lifespan prolongation by HSE was dependent on both transcription factors. In addition to the positive effect on lifespan, HSE treatment also elicited a (strong) protection against amyloid-ß induced toxicity in C. elegans in a DAF-16- and SKN-1-dependent manner. CONCLUSION Our results demonstrate that HSE increases lifespan and protects against amyloid-β toxicity in the model organism C. elegans. These effects were mediated, at least in parts via modulation of pathways leading to activation/nuclear localisation of DAF-16 and SKN-1. Since HCA, a main component of HSE causes only minor effects, additional bioactive compounds like flavonoids or anthocyanins as well as synergistic effects of these compounds should be investigated.
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Affiliation(s)
- Karoline Koch
- Institute of Agricultural and Nutritional Sciences, Biofunctionality of Secondary Plant Compounds, Martin-Luther-University Halle-Wittenberg, Weinbergweg 22, 06120, Halle/Saale, Germany
| | - Nora Weldle
- Institute of Agricultural and Nutritional Sciences, Biofunctionality of Secondary Plant Compounds, Martin-Luther-University Halle-Wittenberg, Weinbergweg 22, 06120, Halle/Saale, Germany
| | - Sabrina Baier
- Institute of Agricultural and Nutritional Sciences, Biofunctionality of Secondary Plant Compounds, Martin-Luther-University Halle-Wittenberg, Weinbergweg 22, 06120, Halle/Saale, Germany
| | - Christian Büchter
- Institute of Agricultural and Nutritional Sciences, Biofunctionality of Secondary Plant Compounds, Martin-Luther-University Halle-Wittenberg, Weinbergweg 22, 06120, Halle/Saale, Germany
| | - Wim Wätjen
- Institute of Agricultural and Nutritional Sciences, Biofunctionality of Secondary Plant Compounds, Martin-Luther-University Halle-Wittenberg, Weinbergweg 22, 06120, Halle/Saale, Germany.
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Moll L, Roitenberg N, Bejerano-Sagie M, Boocholez H, Carvalhal Marques F, Volovik Y, Elami T, Siddiqui AA, Grushko D, Biram A, Lampert B, Achache H, Ravid T, Tzur YB, Cohen E. The insulin/IGF signaling cascade modulates SUMOylation to regulate aging and proteostasis in Caenorhabditis elegans. eLife 2018; 7:38635. [PMID: 30403374 PMCID: PMC6277199 DOI: 10.7554/elife.38635] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Accepted: 11/06/2018] [Indexed: 12/02/2022] Open
Abstract
Although aging-regulating pathways were discovered a few decades ago, it is not entirely clear how their activities are orchestrated, to govern lifespan and proteostasis at the organismal level. Here, we utilized the nematode Caenorhabditis elegans to examine whether the alteration of aging, by reducing the activity of the Insulin/IGF signaling (IIS) cascade, affects protein SUMOylation. We found that IIS activity promotes the SUMOylation of the germline protein, CAR-1, thereby shortening lifespan and impairing proteostasis. In contrast, the expression of mutated CAR-1, that cannot be SUMOylated at residue 185, extends lifespan and enhances proteostasis. A mechanistic analysis indicated that CAR-1 mediates its aging-altering functions, at least partially, through the notch-like receptor glp-1. Our findings unveil a novel regulatory axis in which SUMOylation is utilized to integrate the aging-controlling functions of the IIS and of the germline and provide new insights into the roles of SUMOylation in the regulation of organismal aging. Aging may seem inescapable, but there are many factors, from diet to genetic mutations, that can affect this process. In fact, scientists have started to uncover the mechanisms that control and influence this slow decline. For example, in the small worm Caenorhabditis elegans, removing the germs cells – which give rise to eggs – extends the lifespan. Similarly, interfering with the activity of the Insulin/IGF-1 signaling (IIS) pathway leads to a longer life for the animals. However, it is unclear whether these two mechanisms work together, or if they operate in parallel. To explore this, Moll, Roitenberg et al. first looked at how the IIS pathway regulates a type of protein modification known as SUMOylation in C. elegans. Reducing the activity of the IIS pathway slowed down aging in the worms. It also decreased the levels of SUMOylation of certain proteins, including CAR-1, which is found in the structures that produce germ cells. Further experiments showed that stopping the SUMOylation of CAR-1 extended the lifespan of the animals. In fact, replacing the protein with a mutated version of CAR-1 that cannot accept the SUMO element makes the worms live longer and resist a toxic protein that causes Alzheimer’s disease in humans. These results therefore show that, in C. elegans, the IIS pathway and a mechanism that involves CAR-1 in germ cells work together to determine the pace of aging. Further studies are now needed to dissect how the IIS pathway influences SUMOylation, and whether the findings hold true in mammals.
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Affiliation(s)
- Lorna Moll
- Department of Biochemistry and Molecular Biology, Institute for Medical Research Israel-Canada, The Hebrew University School of Medicine, Jerusalem, Israel
| | - Noa Roitenberg
- Department of Biochemistry and Molecular Biology, Institute for Medical Research Israel-Canada, The Hebrew University School of Medicine, Jerusalem, Israel
| | - Michal Bejerano-Sagie
- Department of Biochemistry and Molecular Biology, Institute for Medical Research Israel-Canada, The Hebrew University School of Medicine, Jerusalem, Israel
| | - Hana Boocholez
- Department of Biochemistry and Molecular Biology, Institute for Medical Research Israel-Canada, The Hebrew University School of Medicine, Jerusalem, Israel
| | - Filipa Carvalhal Marques
- Department of Biochemistry and Molecular Biology, Institute for Medical Research Israel-Canada, The Hebrew University School of Medicine, Jerusalem, Israel
| | - Yuli Volovik
- Department of Biochemistry and Molecular Biology, Institute for Medical Research Israel-Canada, The Hebrew University School of Medicine, Jerusalem, Israel
| | - Tayir Elami
- Department of Biochemistry and Molecular Biology, Institute for Medical Research Israel-Canada, The Hebrew University School of Medicine, Jerusalem, Israel
| | - Atif Ahmed Siddiqui
- Department of Biochemistry and Molecular Biology, Institute for Medical Research Israel-Canada, The Hebrew University School of Medicine, Jerusalem, Israel
| | - Danielle Grushko
- Department of Biochemistry and Molecular Biology, Institute for Medical Research Israel-Canada, The Hebrew University School of Medicine, Jerusalem, Israel
| | - Adi Biram
- Departments of Biological Chemistry, The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Bar Lampert
- Departments of Genetics, The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Hana Achache
- Departments of Genetics, The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Tommer Ravid
- Departments of Biological Chemistry, The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Yonatan B Tzur
- Departments of Genetics, The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Ehud Cohen
- Department of Biochemistry and Molecular Biology, Institute for Medical Research Israel-Canada, The Hebrew University School of Medicine, Jerusalem, Israel
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Menadione sodium bisulfite inhibits the toxic aggregation of amyloid-β(1–42). Biochim Biophys Acta Gen Subj 2018; 1862:2226-2235. [DOI: 10.1016/j.bbagen.2018.07.019] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2018] [Revised: 06/22/2018] [Accepted: 07/17/2018] [Indexed: 12/16/2022]
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Sarasija S, Norman KR. Role of Presenilin in Mitochondrial Oxidative Stress and Neurodegeneration in Caenorhabditis elegans. Antioxidants (Basel) 2018; 7:antiox7090111. [PMID: 30149498 PMCID: PMC6162450 DOI: 10.3390/antiox7090111] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Revised: 08/14/2018] [Accepted: 08/20/2018] [Indexed: 12/31/2022] Open
Abstract
Neurodegenerative diseases like Alzheimer’s disease (AD) are poised to become a global health crisis, and therefore understanding the mechanisms underlying the pathogenesis is critical for the development of therapeutic strategies. Mutations in genes encoding presenilin (PSEN) occur in most familial Alzheimer’s disease but the role of PSEN in AD is not fully understood. In this review, the potential modes of pathogenesis of AD are discussed, focusing on calcium homeostasis and mitochondrial function. Moreover, research using Caenorhabditis elegans to explore the effects of calcium dysregulation due to presenilin mutations on mitochondrial function, oxidative stress and neurodegeneration is explored.
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Affiliation(s)
- Shaarika Sarasija
- Department of Regenerative and Cancer Cell Biology, Albany Medical College, Albany, NY 12208, USA.
| | - Kenneth R Norman
- Department of Regenerative and Cancer Cell Biology, Albany Medical College, Albany, NY 12208, USA.
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Ahmad W, Ebert PR. 5-Methoxyindole-2-carboxylic acid (MICA) suppresses Aβ-mediated pathology in C. elegans. Exp Gerontol 2018; 108:215-225. [DOI: 10.1016/j.exger.2018.04.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Revised: 04/02/2018] [Accepted: 04/26/2018] [Indexed: 12/22/2022]
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36
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Roitenberg N, Bejerano-Sagie M, Boocholez H, Moll L, Marques FC, Golodetzki L, Nevo Y, Elami T, Cohen E. Modulation of caveolae by insulin/IGF-1 signaling regulates aging of Caenorhabditis elegans. EMBO Rep 2018; 19:embr.201745673. [PMID: 29945933 DOI: 10.15252/embr.201745673] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 05/27/2018] [Accepted: 05/29/2018] [Indexed: 11/09/2022] Open
Abstract
Reducing insulin/IGF-1 signaling (IIS) extends lifespan, promotes protein homeostasis (proteostasis), and elevates stress resistance of worms, flies, and mammals. How these functions are orchestrated across the organism is only partially understood. Here, we report that in the nematode Caenorhabditis elegans, the IIS positively regulates the expression of caveolin-1 (cav-1), a gene which is primarily expressed in neurons of the adult worm and underlies the formation of caveolae, a subtype of lipid microdomains that serve as platforms for signaling complexes. Accordingly, IIS reduction lowers cav-1 expression and lessens the quantity of neuronal caveolae. Reduced cav-1 expression extends lifespan and mitigates toxic protein aggregation by modulating the expression of aging-regulating and signaling-promoting genes. Our findings define caveolae as aging-governing signaling centers and underscore the potential for cav-1 as a novel therapeutic target for the promotion of healthy aging.
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Affiliation(s)
- Noa Roitenberg
- Department of Biochemistry and Molecular Biology, The Institute for Medical Research Israel - Canada, The Hebrew University School of Medicine, Jerusalem, Israel
| | - Michal Bejerano-Sagie
- Department of Biochemistry and Molecular Biology, The Institute for Medical Research Israel - Canada, The Hebrew University School of Medicine, Jerusalem, Israel
| | - Hana Boocholez
- Department of Biochemistry and Molecular Biology, The Institute for Medical Research Israel - Canada, The Hebrew University School of Medicine, Jerusalem, Israel
| | - Lorna Moll
- Department of Biochemistry and Molecular Biology, The Institute for Medical Research Israel - Canada, The Hebrew University School of Medicine, Jerusalem, Israel
| | - Filipa Carvalhal Marques
- Department of Biochemistry and Molecular Biology, The Institute for Medical Research Israel - Canada, The Hebrew University School of Medicine, Jerusalem, Israel
| | - Ludmila Golodetzki
- Department of Biochemistry and Molecular Biology, The Institute for Medical Research Israel - Canada, The Hebrew University School of Medicine, Jerusalem, Israel
| | - Yuval Nevo
- Computation Center, Hebrew University-Hadassah Medical School, Jerusalem, Israel
| | - Tayir Elami
- Department of Biochemistry and Molecular Biology, The Institute for Medical Research Israel - Canada, The Hebrew University School of Medicine, Jerusalem, Israel
| | - Ehud Cohen
- Department of Biochemistry and Molecular Biology, The Institute for Medical Research Israel - Canada, The Hebrew University School of Medicine, Jerusalem, Israel
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Mark KA, Dumas KJ, Bhaumik D, Schilling B, Davis S, Oron TR, Sorensen DJ, Lucanic M, Brem RB, Melov S, Ramanathan A, Gibson BW, Lithgow GJ. Vitamin D Promotes Protein Homeostasis and Longevity via the Stress Response Pathway Genes skn-1, ire-1, and xbp-1. Cell Rep 2017; 17:1227-1237. [PMID: 27783938 DOI: 10.1016/j.celrep.2016.09.086] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Revised: 06/09/2016] [Accepted: 09/26/2016] [Indexed: 12/17/2022] Open
Abstract
Vitamin D has multiple roles, including the regulation of bone and calcium homeostasis. Deficiency of 25-hydroxyvitamin D, the major circulating form of vitamin D, is associated with an increased risk of age-related chronic diseases, including Alzheimer's disease, Parkinson's disease, cognitive impairment, and cancer. In this study, we utilized Caenorhabditis elegans to examine the mechanism by which vitamin D influences aging. We found that vitamin-D3-induced lifespan extension requires the stress response pathway genes skn-1, ire-1, and xbp-1. Vitamin D3 (D3) induced expression of SKN-1 target genes but not canonical targets of XBP-1. D3 suppressed an important molecular pathology of aging, that of widespread protein insolubility, and prevented toxicity caused by human β-amyloid. Our observation that D3 improves protein homeostasis and slows aging highlights the importance of maintaining appropriate vitamin D serum levels and may explain why such a wide variety of human age-related diseases are associated with vitamin D deficiency.
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Affiliation(s)
- Karla A Mark
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, CA 94945, USA
| | - Kathleen J Dumas
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, CA 94945, USA.
| | - Dipa Bhaumik
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, CA 94945, USA
| | - Birgit Schilling
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, CA 94945, USA
| | - Sonnet Davis
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, CA 94945, USA
| | - Tal Ronnen Oron
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, CA 94945, USA
| | - Dylan J Sorensen
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, CA 94945, USA
| | - Mark Lucanic
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, CA 94945, USA
| | - Rachel B Brem
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, CA 94945, USA
| | - Simon Melov
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, CA 94945, USA
| | - Arvind Ramanathan
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, CA 94945, USA
| | - Bradford W Gibson
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, CA 94945, USA
| | - Gordon J Lithgow
- The Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, CA 94945, USA.
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38
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Analyzing the locomotory gaitprint of Caenorhabditis elegans on the basis of empirical mode decomposition. PLoS One 2017; 12:e0181469. [PMID: 28742107 PMCID: PMC5524362 DOI: 10.1371/journal.pone.0181469] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2017] [Accepted: 06/30/2017] [Indexed: 01/09/2023] Open
Abstract
The locomotory gait analysis of the microswimmer, Caenorhabditis elegans, is a commonly adopted approach for strain recognition and examination of phenotypic defects. Gait is also a visible behavioral expression of worms under external stimuli. This study developed an adaptive data analysis method based on empirical mode decomposition (EMD) to reveal the biological cues behind intricate motion. The method was used to classify the strains of worms according to their gaitprints (i.e., phenotypic traits of locomotion). First, a norm of the locomotory pattern was created from the worm of interest. The body curvature of the worm was decomposed into four intrinsic mode functions (IMFs). A radar chart showing correlations between the predefined database and measured worm was then obtained by dividing each IMF into three parts, namely, head, mid-body, and tail. A comprehensive resemblance score was estimated after k-means clustering. Simulated data that use sinusoidal waves were generated to assess the feasibility of the algorithm. Results suggested that temporal frequency is the major factor in the process. In practice, five worm strains, including wild-type N2, TJ356 (zIs356), CL2070 (dvIs70), CB0061 (dpy-5), and CL2120 (dvIs14), were investigated. The overall classification accuracy of the gaitprint analyses of all the strains reached nearly 89%. The method can also be extended to classify some motor neuron-related locomotory defects of C. elegans in the same fashion.
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39
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Morales-Zavala F, Arriagada H, Hassan N, Velasco C, Riveros A, Álvarez AR, Minniti AN, Rojas-Silva X, Muñoz LL, Vasquez R, Rodriguez K, Sanchez-Navarro M, Giralt E, Araya E, Aldunate R, Kogan MJ. Peptide multifunctionalized gold nanorods decrease toxicity of β-amyloid peptide in a Caenorhabditis elegans model of Alzheimer's disease. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2017; 13:2341-2350. [PMID: 28673851 DOI: 10.1016/j.nano.2017.06.013] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Revised: 06/01/2017] [Accepted: 06/26/2017] [Indexed: 12/01/2022]
Abstract
The properties of nanometric materials make nanotechnology a promising platform for tackling problems of contemporary medicine. In this work, gold nanorods were synthetized and stabilized with polyethylene glycols and modified with two kinds of peptides. The D1 peptide that recognizes toxic aggregates of Aβ, a peptide involved in Alzheimer's disease (AD); and the Angiopep 2 that can be used to deliver nanorods to the mammalian central nervous system. The nanoconjugates were characterized using absorption spectrophotometry, dynamic light scattering, and transmission electron microscopy, among other techniques. We determined that the nanoconjugate does not affect neuronal viability; it penetrates the cells, and decreases aggregation of Aβ peptide in vitro. We also showed that when we apply our nanosystem to a Caenorhabditis elegans AD model, the toxicity of aggregated Aβ peptide is decreased. This work may contribute to the development of therapies for AD based on metallic nanoparticles.
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Affiliation(s)
- Francisco Morales-Zavala
- Departamento de Química Farmacológica y Toxicológica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago; Advanced Center for Chronic Diseases (ACCDiS), Sergio Livingstone 1007, Independencia, Santiago, Chile.
| | - Hector Arriagada
- Escuela de Biotecnología, Facultad de Ciencias, Universidad Santo Tomás, Ejercito 146, Santiago, Chile.
| | - Natalia Hassan
- Departamento de Química Farmacológica y Toxicológica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago; Programa Institucional de Fomento a la I+D+I, Universidad Tecnológica Metropolitana, Edificio de Ciencia y Tecnologia, Ignacio Valdivieso 2409, San Joaquin.
| | - Carolina Velasco
- Departamento de Química Farmacológica y Toxicológica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago; Advanced Center for Chronic Diseases (ACCDiS), Sergio Livingstone 1007, Independencia, Santiago, Chile.
| | - Ana Riveros
- Departamento de Química Farmacológica y Toxicológica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago; Advanced Center for Chronic Diseases (ACCDiS), Sergio Livingstone 1007, Independencia, Santiago, Chile.
| | - Alejandra R Álvarez
- Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Alameda 340, Santiago 8331010, Chile; Centro de envejecimiento y regeneración (CARE), Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile.
| | - Alicia N Minniti
- Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Alameda 340, Santiago 8331010, Chile.
| | - Ximena Rojas-Silva
- Sección de Metrología Química, Comisión Chilena de Energía Nuclear, Nueva Bilbao 12501, La Reina, Santiago, Chile.
| | - Luis L Muñoz
- Sección de Metrología Química, Comisión Chilena de Energía Nuclear, Nueva Bilbao 12501, La Reina, Santiago, Chile.
| | - Rodrigo Vasquez
- Departamento de Química Farmacológica y Toxicológica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago; Advanced Center for Chronic Diseases (ACCDiS), Sergio Livingstone 1007, Independencia, Santiago, Chile; Departamento de Ciencias Quimicas, Facultad de Ciencias Exactas, Universidad Andres Bello, Av. Republica 275, Santiago, Chile.
| | - Katherine Rodriguez
- Departamento de Ciencias Quimicas, Facultad de Ciencias Exactas, Universidad Andres Bello, Av. Republica 275, Santiago, Chile.
| | - Macarena Sanchez-Navarro
- Institute for Research in Biomedicine-Barcelona Institute of Science and Technology, Baldiri Reixac 10, 08028 Barcelona, Spain.
| | - Ernest Giralt
- Institute for Research in Biomedicine-Barcelona Institute of Science and Technology, Baldiri Reixac 10, 08028 Barcelona, Spain.
| | - Eyleen Araya
- Departamento de Ciencias Quimicas, Facultad de Ciencias Exactas, Universidad Andres Bello, Av. Republica 275, Santiago, Chile.
| | - Rebeca Aldunate
- Escuela de Biotecnología, Facultad de Ciencias, Universidad Santo Tomás, Ejercito 146, Santiago, Chile.
| | - Marcelo J Kogan
- Departamento de Química Farmacológica y Toxicológica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago; Advanced Center for Chronic Diseases (ACCDiS), Sergio Livingstone 1007, Independencia, Santiago, Chile.
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40
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Goch W, Bal W. Numerical Simulations Reveal Randomness of Cu(II) Induced Aβ Peptide Dimerization under Conditions Present in Glutamatergic Synapses. PLoS One 2017; 12:e0170749. [PMID: 28125716 PMCID: PMC5268396 DOI: 10.1371/journal.pone.0170749] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Accepted: 01/10/2017] [Indexed: 12/22/2022] Open
Abstract
The interactions between the Aβ1-40 molecules species and the copper ions (Cu(II)) were intensively investigated due to their potential role in the development of the Alzheimer Disease (AD). The rate and the mechanism of the Cu(II)-Aβ complexes formation determines the aggregation pathway of the Aβ species, starting from smaller but more cytotoxic oligomers and ending up in large Aβ plaques, being the main hallmark of the AD. In our study we exploit the existing knowledge on the Cu(II)-Aβ interactions and create the theoretical model of the initial phase of the copper- driven Aβ aggregation mechanism. The model is based on the direct solution of the Chemical Master Equations, which capture the inherent stochastics of the considered system. In our work we argue that due to a strong Cu(II) affinity to Aβ and temporal accessibility of the Cu(II) ions during normal synaptic activity the aggregation driven by Cu(II) dominates the pure Aβ aggregation. We also demonstrate the dependence of the formation of different Cu(II)-Aβ complexes on the concentrations of reagents and the synaptic activity. Our findings correspond to recent experimental results and give a sound hypothesis on the AD development mechanisms.
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Affiliation(s)
- Wojciech Goch
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland
| | - Wojciech Bal
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland
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41
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Kim DK, Kim TH, Lee SJ. Mechanisms of aging-related proteinopathies in Caenorhabditis elegans. Exp Mol Med 2016; 48:e263. [PMID: 27713398 PMCID: PMC5099420 DOI: 10.1038/emm.2016.109] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Revised: 07/05/2016] [Accepted: 07/12/2016] [Indexed: 12/24/2022] Open
Abstract
Aging is the most important risk factor for human neurodegenerative diseases such as Alzheimer's and Parkinson's diseases. Pathologically, these diseases are characterized by the deposition of specific protein aggregates in neurons and glia, representing the impairment of neuronal proteostasis. However, the mechanism by which aging affects the proteostasis system and promotes protein aggregation remains largely unknown. The short lifespan and ample genetic resources of Caenorhabditis elegans (C. elegans) have made this species a favorite model organism for aging research, and the development of proteinopathy models in this organism has helped us to understand how aging processes affect protein aggregation and neurodegeneration. Here, we review the recent literature on proteinopathies in C. elegans models and discuss the insights we have gained into the mechanisms of how aging processes are integrated into the pathogenesis of various neurodegenerative diseases.
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Affiliation(s)
- Dong-Kyu Kim
- Department of Biomedical Sciences, Neuroscience Research Institute, Seoul National University College of Medicine, Seoul, Korea
- Department of Biomedical Science and Technology, Konkuk University, Seoul, Korea
| | - Tae Ho Kim
- Department of Biomedical Sciences, Neuroscience Research Institute, Seoul National University College of Medicine, Seoul, Korea
- Department of Medicine, Inha University School of Medicine, Incheon, Korea
| | - Seung-Jae Lee
- Department of Biomedical Sciences, Neuroscience Research Institute, Seoul National University College of Medicine, Seoul, Korea
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42
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Fong S, Teo E, Ng LF, Chen CB, Lakshmanan LN, Tsoi SY, Moore PK, Inoue T, Halliwell B, Gruber J. Energy crisis precedes global metabolic failure in a novel Caenorhabditis elegans Alzheimer Disease model. Sci Rep 2016; 6:33781. [PMID: 27653553 PMCID: PMC5031964 DOI: 10.1038/srep33781] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2016] [Accepted: 09/01/2016] [Indexed: 01/01/2023] Open
Abstract
Alzheimer Disease (AD) is a progressive neurological disorder characterized by the deposition of amyloid beta (Aβ), predominantly the Aβ1–42 form, in the brain. Mitochondrial dysfunction and impaired energy metabolism are important components of AD pathogenesis. However, the causal and temporal relationships between them and AD pathology remain unclear. Using a novel C. elegans AD strain with constitutive neuronal Aβ1–42 expression that displays neuromuscular defects and age-dependent behavioural dysfunction reminiscent of AD, we have shown that mitochondrial bioenergetic deficit is an early event in AD pathogenesis, preceding dysfunction of mitochondrial electron transfer chain (ETC) complexes and the onset of global metabolic failure. These results are consistent with an emerging view that AD may be a metabolic neurodegenerative disease, and also confirm that Aβ-driven metabolic and mitochondrial effects can be reproduced in organisms separated by large evolutionary distances.
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Affiliation(s)
- Sheng Fong
- Internal Medicine Residency Programme, SingHealth Group, Singapore
| | - Emelyne Teo
- NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore
| | - Li Fang Ng
- Science Division, Yale-NUS College, Singapore
| | - Ce-Belle Chen
- Department of Biochemistry, National University of Singapore, Singapore
| | | | | | - Philip Keith Moore
- NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore
| | - Takao Inoue
- Department of Biochemistry, National University of Singapore, Singapore
| | - Barry Halliwell
- Department of Biochemistry, National University of Singapore, Singapore
| | - Jan Gruber
- Science Division, Yale-NUS College, Singapore.,Department of Biochemistry, National University of Singapore, Singapore
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43
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Ahmad W, Ebert PR. Metformin Attenuates Aβ Pathology Mediated Through Levamisole Sensitive Nicotinic Acetylcholine Receptors in a C. elegans Model of Alzheimer's Disease. Mol Neurobiol 2016; 54:5427-5439. [PMID: 27596506 DOI: 10.1007/s12035-016-0085-y] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Accepted: 08/24/2016] [Indexed: 12/22/2022]
Abstract
The metabolic disease, type 2 diabetes mellitus (T2DM), is a major risk factor for Alzheimer's disease (AD). This suggests that drugs such as metformin that are used to treat T2DM may also be therapeutic toward AD and indicates an interaction between AD and energy metabolism. In this study, we have investigated the effects of metformin and another T2DM drug, 5-aminoimidazole-4-carboxamide ribonucleotide (AICAR) in C. elegans expressing human Aβ42. We found that Aβ expressed in muscle inhibited levamisole sensitive nicotinic acetylcholine receptors and that metformin delayed Aβ-linked paralysis and improved acetylcholine neurotransmission in these animals. Metformin also moderated the effect of neuronal expression of Aβ: decreasing hypersensitivity to serotonin, restoring normal chemotaxis, and improving fecundity. Metformin was unable to overcome the small effect of neuronal Aβ on egg viability. The protective effects of metformin were associated with a decrease in the amount of toxic, oligomeric Aβ. AICAR has a similar protective effect against Aβ toxicity. This work supports the notion that anti-diabetes drugs and metabolic modulators may be effective against AD and that the worm model can be used to identify the specific interactions between Aβ and cellular proteins.
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Affiliation(s)
- Waqar Ahmad
- School of Biological Sciences, The University of Queensland, Brisbane, 4072, Australia
| | - Paul R Ebert
- School of Biological Sciences, The University of Queensland, Brisbane, 4072, Australia.
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44
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Zhang XG, Wang X, Zhou TT, Wu XF, Peng Y, Zhang WQ, Li S, Zhao J. Scorpion Venom Heat-Resistant Peptide Protects Transgenic Caenorhabditis elegans from β-Amyloid Toxicity. Front Pharmacol 2016; 7:227. [PMID: 27507947 PMCID: PMC4960250 DOI: 10.3389/fphar.2016.00227] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Accepted: 07/13/2016] [Indexed: 12/21/2022] Open
Abstract
Scorpion venom heat-resistant peptide (SVHRP) is a component purified from Buthus martensii Karsch scorpion venom. Our previous studies found SVHRP could enhance neurogenesis and inhibit microglia-mediated neuroinflammation in vivo. Here, we use the transgenic CL4176, CL2006, and CL2355 strains of Caenorhabditis elegans which express the human Aβ1-42 to investigate the effects and the possible mechanisms of SVHRP mediated protection against Aβ toxicity in vivo. The results showed that SVHRP-fed worms displayed remarkably decreased paralysis, less abundant toxic Aβ oligomers, reduced Aβ plaque deposition with respect to untreated animals. SVHRP also suppressed neuronal Aβ expression-induced defects in chemotaxis behavior and attenuated levels of ROS in the transgenic C. elegans. Taken together, these results suggest SVHRP could protect against Aβ-induced toxicity in C. elegans. Further studies need to be conducted in murine models and humans to analyze the effectiveness of the peptide.
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Affiliation(s)
- Xiao-Gang Zhang
- Department of Physiology, Dalian Medical University Dalian, China
| | - Xi Wang
- Department of Physiology, Dalian Medical University Dalian, China
| | - Ting-Ting Zhou
- Department of Neurology, the First Affiliated Hospital of Dalian Medical University Dalian, China
| | - Xue-Fei Wu
- Department of Physiology, Dalian Medical University Dalian, China
| | - Yan Peng
- Department of Physiology, Dalian Medical University Dalian, China
| | - Wan-Qin Zhang
- Department of Physiology, Dalian Medical University Dalian, China
| | - Shao Li
- Department of Physiology, Dalian Medical University Dalian, China
| | - Jie Zhao
- Department of Physiology, Dalian Medical UniversityDalian, China; Liaoning Engineering Technology Centre of Target-based Nature Products for Prevention and Treatment of Ageing-related NeurodegenerationDalian, China
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45
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Zhang Z, Ma H, Wang X, Zhao Z, Zhang Y, Zhao B, Guo Y, Xu L. A tetrapeptide from maize protects a transgenic Caenorhabditis elegans Aβ1-42model from Aβ-induced toxicity. RSC Adv 2016. [DOI: 10.1039/c6ra06130c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A food-derived bioactive peptide that works as an important antioxidantin vivocould be used to remedy oxidative stress-related diseases.
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Affiliation(s)
- Zhixian Zhang
- Key Laboratory for Molecular Enzymology and Engineering
- The Ministry of Education
- National Engineering Laboratory for AIDS Vaccine
- School of Life Sciences
- Jilin University
| | - Heran Ma
- Key Laboratory for Molecular Enzymology and Engineering
- The Ministry of Education
- National Engineering Laboratory for AIDS Vaccine
- School of Life Sciences
- Jilin University
| | - Xiaoying Wang
- Jilin Province People's Hospital
- Changchun 130021
- China
| | - Ziyuan Zhao
- Key Laboratory for Molecular Enzymology and Engineering
- The Ministry of Education
- National Engineering Laboratory for AIDS Vaccine
- School of Life Sciences
- Jilin University
| | - Yue Zhang
- Key Laboratory for Molecular Enzymology and Engineering
- The Ministry of Education
- National Engineering Laboratory for AIDS Vaccine
- School of Life Sciences
- Jilin University
| | - Baolu Zhao
- State Key Laboratory of Brain and Cognitive Science
- Institute of Biophysics
- Chinese Academy of Sciences
- Beijing 100101
- China
| | - Yi Guo
- Key Laboratory for Molecular Enzymology and Engineering
- The Ministry of Education
- National Engineering Laboratory for AIDS Vaccine
- School of Life Sciences
- Jilin University
| | - Li Xu
- Key Laboratory for Molecular Enzymology and Engineering
- The Ministry of Education
- National Engineering Laboratory for AIDS Vaccine
- School of Life Sciences
- Jilin University
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46
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Gunn AP, Wong BX, Johanssen T, Griffith JC, Masters CL, Bush AI, Barnham KJ, Duce JA, Cherny RA. Amyloid-β Peptide Aβ3pE-42 Induces Lipid Peroxidation, Membrane Permeabilization, and Calcium Influx in Neurons. J Biol Chem 2015; 291:6134-45. [PMID: 26697885 DOI: 10.1074/jbc.m115.655183] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Indexed: 12/19/2022] Open
Abstract
Pyroglutamate-modified amyloid-β (pE-Aβ) is a highly neurotoxic amyloid-β (Aβ) isoform and is enriched in the brains of individuals with Alzheimer disease compared with healthy aged controls. Pyroglutamate formation increases the rate of Aβ oligomerization and alters the interactions of Aβ with Cu(2+) and lipids; however, a link between these properties and the toxicity of pE-Aβ peptides has not been established. We report here that Aβ3pE-42 has an enhanced capacity to cause lipid peroxidation in primary cortical mouse neurons compared with the full-length isoform (Aβ(1-42)). In contrast, Aβ(1-42) caused a significant elevation in cytosolic reactive oxygen species, whereas Aβ3pE-42 did not. We also report that Aβ3pE-42 preferentially associates with neuronal membranes and triggers Ca(2+) influx that can be partially blocked by the N-methyl-d-aspartate receptor antagonist MK-801. Aβ3pE-42 further caused a loss of plasma membrane integrity and remained bound to neurons at significantly higher levels than Aβ(1-42) over extended incubations. Pyroglutamate formation was additionally found to increase the relative efficiency of Aβ-dityrosine oligomer formation mediated by copper-redox cycling.
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Affiliation(s)
- Adam P Gunn
- From the Florey Institute of Neuroscience and Mental Health
| | - Bruce X Wong
- From the Florey Institute of Neuroscience and Mental Health
| | | | - James C Griffith
- Materials Characterisation and Fabrication Platform, University of Melbourne, Parkville, Melbourne 3010, Australia and
| | | | - Ashley I Bush
- From the Florey Institute of Neuroscience and Mental Health, Departments of Pathology and
| | - Kevin J Barnham
- From the Florey Institute of Neuroscience and Mental Health, Pharmacology and Therapeutics, and
| | - James A Duce
- From the Florey Institute of Neuroscience and Mental Health, Departments of Pathology and the School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, West Yorkshire LS2 9JT, United Kingdom
| | - Robert A Cherny
- From the Florey Institute of Neuroscience and Mental Health,
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47
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Guo H, Cao M, Zou S, Ye B, Dong Y. Cranberry Extract Standardized for Proanthocyanidins Alleviates β-Amyloid Peptide Toxicity by Improving Proteostasis Through HSF-1 in Caenorhabditis elegans Model of Alzheimer's Disease. J Gerontol A Biol Sci Med Sci 2015; 71:1564-1573. [PMID: 26405062 DOI: 10.1093/gerona/glv165] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Accepted: 08/31/2015] [Indexed: 12/31/2022] Open
Abstract
A growing body of evidence suggests that nutraceuticals with prolongevity properties may delay the onset of Alzheimer's disease (AD). We recently demonstrated that a proanthocyanidins-standardized cranberry extract has properties that prolong life span and promote innate immunity in Caenorhabditis elegans In this article, we report that supplementation of this cranberry extract delayed Aβ toxicity-triggered body paralysis in the C elegans AD model. Genetic analyses indicated that the cranberry-mediated Aβ toxicity alleviation required heat shock transcription factor (HSF)-1 rather than DAF-16 and SKN-1. Moreover, cranberry supplementation increased the transactivity of HSF-1 in an IIS-dependent manner. Further studies found that the cranberry extract relies on HSF-1 to significantly enhance the solubility of proteins in aged worms, implying an improved proteostasis in AD worms. Considering that HSF-1 plays a pivotal role in maintaining proteostasis, our results suggest that cranberry maintains the function of proteostasis through HSF-1, thereby protecting C elegans against Aβ toxicity. Together, our findings elucidated the mechanism whereby cranberry attenuated Aβ toxicity in C elegans and stressed the significance of proteostasis in the prevention of age-related diseases from a practical point of view.
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Affiliation(s)
- Hong Guo
- Department of Biological Sciences, Clemson University, South Carolina.,School of Life Science and Technology, China Pharmaceutical University, Nanjing, China
| | - Min Cao
- Department of Biological Sciences, Clemson University, South Carolina.,Institute for Engaged Aging, Clemson University, Clemson, South Carolina
| | - Sige Zou
- Functional Genomics Unit, Translational Gerontology Branch, National Institute on Aging, Baltimore, Maryland
| | - Boping Ye
- School of Life Science and Technology, China Pharmaceutical University, Nanjing, China
| | - Yuqing Dong
- Department of Biological Sciences, Clemson University, South Carolina. .,Institute for Engaged Aging, Clemson University, Clemson, South Carolina
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48
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Stabilization of nontoxic Aβ-oligomers: insights into the mechanism of action of hydroxyquinolines in Alzheimer's disease. J Neurosci 2015; 35:2871-84. [PMID: 25698727 DOI: 10.1523/jneurosci.2912-14.2015] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
The extracellular accumulation of amyloid β (Aβ) peptides is characteristic of Alzheimer's disease (AD). However, formation of diffusible, oligomeric forms of Aβ, both on and off pathways to amyloid fibrils, is thought to include neurotoxic species responsible for synaptic loss and neurodegeneration, rather than polymeric amyloid aggregates. The 8-hydroxyquinolines (8-HQ) clioquinol (CQ) and PBT2 were developed for their ability to inhibit metal-mediated generation of reactive oxygen species from Aβ:Cu complexes and have both undergone preclinical and Phase II clinical development for the treatment of AD. Their respective modes of action are not fully understood and may include both inhibition of Aβ fibrillar polymerization and direct depolymerization of existing Aβ fibrils. In the present study, we find that CQ and PBT2 can interact directly with Aβ and affect its propensity to aggregate. Using a combination of biophysical techniques, we demonstrate that, in the presence of these 8-HQs and in the absence of metal ions, Aβ associates with two 8-HQ molecules and forms a dimer. Furthermore, 8-HQ bind Aβ with an affinity of 1-10 μm and suppress the formation of large (>30 kDa) oligomers. The stabilized low molecular weight species are nontoxic. Treatment with 8-HQs also reduces the levels of in vivo soluble oligomers in a Caenorhabditis elegans model of Aβ toxicity. We propose that 8-HQs possess an additional mechanism of action that neutralizes neurotoxic Aβ oligomer formation through stabilization of small (dimeric) nontoxic Aβ conformers.
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49
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Collins SJ, Tumpach C, Li QX, Lewis V, Ryan TM, Roberts B, Drew SC, Lawson VA, Haigh CL. The prion protein regulates beta-amyloid-mediated self-renewal of neural stem cells in vitro. Stem Cell Res Ther 2015; 6:60. [PMID: 25884827 PMCID: PMC4435829 DOI: 10.1186/s13287-015-0067-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Revised: 01/27/2015] [Accepted: 03/25/2015] [Indexed: 11/10/2022] Open
Abstract
The beta-amyloid (Aβ) peptide and the Aβ-oligomer receptor, prion protein (PrP), both influence neurogenesis. Using in vitro murine neural stem cells (NSCs), we investigated whether Aβ and PrP interact to modify neurogenesis. Aβ imparted PrP-dependent changes on NSC self-renewal, with PrP-ablated and wild-type NSCs displaying increased and decreased cell growth, respectively. In contrast, differentiation of Aβ-treated NSCs into mature cells was unaffected by PrP expression. Such marked PrP-dependent differences in NSC growth responses to Aβ provides further evidence of biologically significant interactions between these two factors and an important new insight into regulation of NSC self-renewal in vivo.
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Affiliation(s)
- Steven J Collins
- Department of Pathology, The University of Melbourne, Melbourne Brain Centre, Melbourne, VIC, 3010, Australia. .,Department of Medicine, Royal Melbourne Hospital, The University of Melbourne, Melbourne, VIC, 3010, Australia. .,Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Melbourne, VIC, 3010, Australia.
| | - Carolin Tumpach
- Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Melbourne, VIC, 3010, Australia.
| | - Qiao-Xin Li
- Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Melbourne, VIC, 3010, Australia.
| | - Victoria Lewis
- Department of Pathology, The University of Melbourne, Melbourne Brain Centre, Melbourne, VIC, 3010, Australia.
| | - Timothy M Ryan
- Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Melbourne, VIC, 3010, Australia.
| | - Blaine Roberts
- Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Melbourne, VIC, 3010, Australia.
| | - Simon C Drew
- The Florey Department of Neuroscience and Mental Health, The University of Melbourne, Melbourne, VIC, 3010, Australia.
| | - Victoria A Lawson
- Department of Pathology, The University of Melbourne, Melbourne Brain Centre, Melbourne, VIC, 3010, Australia.
| | - Cathryn L Haigh
- Department of Pathology, The University of Melbourne, Melbourne Brain Centre, Melbourne, VIC, 3010, Australia.
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Isoglutaminyl cyclase contributes to CCL2-driven neuroinflammation in Alzheimer's disease. Acta Neuropathol 2015; 129:565-83. [PMID: 25666182 PMCID: PMC4366547 DOI: 10.1007/s00401-015-1395-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Revised: 01/27/2015] [Accepted: 01/28/2015] [Indexed: 11/30/2022]
Abstract
The brains of Alzheimer’s disease (AD) patients are characterized by deposits of Abeta peptides and by accompanying chronic inflammation. Here, we provide evidence that the enzyme isoglutaminyl cyclase (isoQC) is a novel factor contributing to both aspects of AD pathology. Two putative substrates of isoQC, N-truncated Abeta peptides and the monocyte chemoattractant chemokine CCL2, undergo isoQC-catalyzed pyroglutamate (pGlu) modification. This triggers Abeta aggregation and facilitates the biological activity of CCL2, which collectively results in the formation of high molecular weight Abeta aggregates, glial cell activation, neuroinflammation and neuronal cell death. In mouse brain, we found isoQC to be neuron-specifically expressed in neocortical, hippocampal and subcortical structures, localized to the endoplasmic reticulum and Golgi apparatus as well as co-expressed with its substrate CCL2. In aged APP transgenic Tg2576 mice, both isoQC and CCL2 mRNA levels are up-regulated and isoQC and CCL2 proteins were found to be co-induced in Abeta plaque-associated reactive astrocytes. Also, in mouse primary astrocyte culture, a simultaneous up-regulation of isoQC and CCL2 expression was revealed upon Abeta and pGlu-Abeta stimulation. In brains of AD patients, the expression of isoQC and CCL2 mRNA and protein is up-regulated compared to controls and correlates with pGlu-Abeta load and with the decline in mini-mental state examination. Our observations provide evidence for a dual involvement of isoQC in AD pathogenesis by catalysis of pGlu-Abeta and pGlu-CCL2 formation which mutually stimulate inflammatory events and affect cognition. We conclude that isoQC inhibition may target both major pathological events in the development of AD.
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