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Autooxidation of curcumin in physiological buffer causes an enhanced synergistic anti-amyloid effect. Int J Biol Macromol 2023; 235:123629. [PMID: 36773869 DOI: 10.1016/j.ijbiomac.2023.123629] [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: 10/18/2022] [Revised: 12/27/2022] [Accepted: 02/06/2023] [Indexed: 02/11/2023]
Abstract
Curcumin is an important food additive that shows multiple medical-benefits including anticarcinogenic, anti-inflammatory, antibiotic and antiamyloid properties. However, understanding the mechanism of curcumin-mediated effects becomes rather complicated since it has low bio-viability and it undergoes autooxidation, influenced by temperature, pH and buffer. We find that curcumin's antiamyloid-potential is not primarily due to curcumin alone, rather due to a synergistic action of curcumin and its autooxidized-products generated during inhibition reactions. In physiological buffer curcumin undergoes thermally induced autooxidation and yields stable compounds which can synergistically work for both inhibition of amyloid aggregation and promotion of amyloid-disaggregation into soluble protein species. Curcumin also showed substantial inhibition effect against coaggregation of different food proteins. Curcumin's strong affinity for the hydrophobic moieties of the aggregation-prone partially-folded insulin structures seems crucial for the inhibition mechanism. Further, autooxidized curcumin products were found to protect UV-induced protein damage. The results provide conceptual foundations highlighting the link between chemistry and antiamyloid-activity of curcumin and may inspire curcumin-based therapeutics against amyloidogenesis.
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2
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Huo XZ, Wang X, Yang R, Qu LB, Zeng HJ. Studies on the effect of a Fupenzi glycoprotein on the fibrillation of bovine serum albumin and its antioxidant activity. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 237:118387. [PMID: 32416513 DOI: 10.1016/j.saa.2020.118387] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 02/04/2020] [Accepted: 04/18/2020] [Indexed: 06/11/2023]
Abstract
In this study, the effect of a glycoprotein obtained from Fupenzi (FPZ) (Rubus chingii Hu.) on the fibrillation of bovine serum album (BSA) was investigated by multi-spectroscopic methods and transmission electron microscopy. Moreover, the cytotoxicity of the glycoprotein and the effect of it on H2O2-induced cell viability were investigated by cell counting kit and β-galactosidase kit, respectively. The experimental results indicated that the glycoprotein showed very low toxicity to NRK-52E cells and could obviously delay cell senescence and improve cell viability. Moreover, the glycoprotein could effectively inhibit the formation of BSA fibrils and destroy the stability of preformed BSA fibrils in a concentration-dependent manner. Generally, antioxidant capacities are thought to be related to the anti-amyloidogenic activity of inhibitors; therefore, to reveal the inhibitory mechanism, the anti-oxidative property of the glycoprotein was examined by DPPH and ABTS assays. The results demonstrated that FPZ glycoprotein had a remarkable antioxidant activity and the IC50 values of DPPH and ABTS were 0.249 mg mL-1 and 0.092 mg mL-1, respectively. This work suggested that the FPZ glycoprotein had the potential to be designed a new therapeutic agent for attenuating aging and preventing the age-related diseases.
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Affiliation(s)
- Xiu-Zhu Huo
- School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, PR China
| | - Xia Wang
- School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, PR China
| | - Ran Yang
- College of Chemistry, Green Catalysis Center, Henan Joint International Research Laboratory of Green Construction of Functional Molecules and Their Bioanalytical Applications, Zhengzhou University, Zhengzhou 450001, PR China
| | - Ling-Bo Qu
- College of Chemistry, Green Catalysis Center, Henan Joint International Research Laboratory of Green Construction of Functional Molecules and Their Bioanalytical Applications, Zhengzhou University, Zhengzhou 450001, PR China
| | - Hua-Jin Zeng
- School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, PR China.
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3
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Jansens KJA, Lambrecht MA, Rombouts I, Monge Morera M, Brijs K, Rousseau F, Schymkowitz J, Delcour JA. Conditions Governing Food Protein Amyloid Fibril Formation-Part I: Egg and Cereal Proteins. Compr Rev Food Sci Food Saf 2019; 18:1256-1276. [PMID: 33336994 DOI: 10.1111/1541-4337.12462] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 04/26/2019] [Accepted: 05/13/2019] [Indexed: 12/18/2022]
Abstract
Conditions including heating mode, time, temperature, pH, moisture and protein concentration, shear, and the presence of alcohols, chaotropic/reducing agents, enzymes, and/or salt influence amyloid fibril (AF) formation as they can affect the accessibility of amino acid sequences prone to aggregate. As some conditions applied on model protein resemble conditions in food processing unit operations, we here hypothesize that food processing can lead to formation of protein AFs with a compact cross β-sheet structure. This paper reviews conditions and food constituents that affect amyloid fibrillation of egg and cereal proteins. While egg and cereal proteins often coexist in food products, their impact on each other's fibrillation remains unknown. Hen egg ovalbumin and lysozyme form AFs when subjected to moderate heating at acidic pH separately. AFs can also be formed at higher pH, especially in the presence of alcohols or chaotropic/reducing agents. Tryptic wheat gluten digests can form fibrillar structures at neutral pH and maize and rice proteins do so in aqueous ethanol or at acidic pH, respectively.
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Affiliation(s)
- Koen J A Jansens
- KU Leuven, Laboratory of Food Chemistry and Biochemistry and Leuven Food Science and Nutrition Research Centre (LFoRCe), Kasteelpark Arenberg 20, B-3001, Leuven, Belgium.,Nutrex NV, Achterstenhoek 5, B-2275, Lille, Belgium
| | - Marlies A Lambrecht
- KU Leuven, Laboratory of Food Chemistry and Biochemistry and Leuven Food Science and Nutrition Research Centre (LFoRCe), Kasteelpark Arenberg 20, B-3001, Leuven, Belgium
| | - Ine Rombouts
- KU Leuven, Laboratory of Food Chemistry and Biochemistry and Leuven Food Science and Nutrition Research Centre (LFoRCe), Kasteelpark Arenberg 20, B-3001, Leuven, Belgium.,KU Leuven, ECOVO, Kasteelpark Arenberg 21, B-3001, Leuven, Belgium
| | - Margarita Monge Morera
- KU Leuven, Laboratory of Food Chemistry and Biochemistry and Leuven Food Science and Nutrition Research Centre (LFoRCe), Kasteelpark Arenberg 20, B-3001, Leuven, Belgium
| | - Kristof Brijs
- KU Leuven, Laboratory of Food Chemistry and Biochemistry and Leuven Food Science and Nutrition Research Centre (LFoRCe), Kasteelpark Arenberg 20, B-3001, Leuven, Belgium
| | - Frederic Rousseau
- Switch Laboratory, VIB, and Dept. of Cellular and Molecular Medicine, KU Leuven, B-3000, Leuven, Belgium
| | - Joost Schymkowitz
- Switch Laboratory, VIB, and Dept. of Cellular and Molecular Medicine, KU Leuven, B-3000, Leuven, Belgium
| | - Jan A Delcour
- KU Leuven, Laboratory of Food Chemistry and Biochemistry and Leuven Food Science and Nutrition Research Centre (LFoRCe), Kasteelpark Arenberg 20, B-3001, Leuven, Belgium
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4
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Sun LJ, Qu L, Yang R, Yin L, Zeng HJ. Cysteamine functionalized MoS2 quantum dots inhibit amyloid aggregation. Int J Biol Macromol 2019; 128:870-876. [DOI: 10.1016/j.ijbiomac.2019.01.212] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 01/31/2019] [Accepted: 01/31/2019] [Indexed: 01/28/2023]
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5
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Liu Z, Li X, Wu X, Zhu C. A dual-inhibitor system for the effective antifibrillation of Aβ40 peptides by biodegradable EGCG–Fe(iii)/PVP nanoparticles. J Mater Chem B 2019; 7:1292-1299. [DOI: 10.1039/c8tb03266a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
By the synergistic effect of dual inhibition, EFPP NPs exhibited a significant effect on the inhibition of Aβ40 fibrillation and on the disaggregation of existing Aβ40 fibrils.
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Affiliation(s)
- Zexiu Liu
- Institute of Food Safety and Environment Monitoring
- College of Chemistry
- Fuzhou University
- Fuzhou 350116
- P. R. China
| | - Xianglong Li
- Institute of Food Safety and Environment Monitoring
- College of Chemistry
- Fuzhou University
- Fuzhou 350116
- P. R. China
| | - Xiaoping Wu
- Institute of Food Safety and Environment Monitoring
- College of Chemistry
- Fuzhou University
- Fuzhou 350116
- P. R. China
| | - Chunling Zhu
- Institute of Food Safety and Environment Monitoring
- College of Chemistry
- Fuzhou University
- Fuzhou 350116
- P. R. China
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6
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7
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Jayamani J, Naisini A, Madhan B, Shanmugam G. Ferulic acid, a natural phenolic compound, as a potential inhibitor for collagen fibril formation and its propagation. Int J Biol Macromol 2018; 113:277-284. [DOI: 10.1016/j.ijbiomac.2018.01.225] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Revised: 01/24/2018] [Accepted: 01/30/2018] [Indexed: 01/09/2023]
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8
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Disintegration of collagen fibrils by Glucono-δ-lactone: An implied lead for disintegration of fibrosis. Int J Biol Macromol 2018; 107:175-185. [DOI: 10.1016/j.ijbiomac.2017.08.158] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 07/27/2017] [Accepted: 08/29/2017] [Indexed: 11/23/2022]
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9
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Anand BG, Dubey K, Shekhawat DS, Prajapati KP, Kar K. Strategically Designed Antifibrotic Gold Nanoparticles to Prevent Collagen Fibril Formation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:13252-13261. [PMID: 29072918 DOI: 10.1021/acs.langmuir.7b01504] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Because uncontrolled accumulation of collagen fibrils has been implicated in a series of pathologies, inhibition of collagen fibril formation has become one of the necessary strategies to target such collagen-linked complications. The presence of hydroxyproline (Hyp) at the Y position in (Gly-X-Y)n sequence pattern of collagen is known to facilitate crucial hydrophobic and hydration-linked interactions that promote collagen fibril formation. Here, to target such Hyp-mediated interactions, we have synthesized uniform, thermostable, and hemocompatible Hyp coated gold nanoparticles (AuNPsHYP) and have examined their inhibition effect on the fibril formation of type I collagen. We found that collagen fibril formation is strongly suppressed in the presence of AuNPsHYP and no such suppression effect was observed in the presence of free Hyp and control Gly-coated nanoparticles at similar concentrations. Both isothermal titration calorimetric studies and bioinformatics analysis reveal possible interaction between Hyp and (Gly-Pro-Hyp) stretches of collagen triple-helical model peptides. Further, gold nanoparticles coated with proline (AuNPsPRO) and tryptophan (AuNPsTRP) also suppressed collagen fibril formation, suggesting their ability to interfere with aromatic-proline as well as hydrophobic interactions between collagen molecules. The Hyp molecules, when surface functionalized, are predicted to interfere with the Hyp-mediated forces that drive collagen self-assembly, and such inhibition effect may help in targeting collagen linked pathologies.
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Affiliation(s)
- Bibin Ganadhason Anand
- Department of Bioscience and Bioengineering, Indian Institute of Technology Jodhpur , Jodhpur, Rajasthan-342011, India
| | - Kriti Dubey
- Department of Bioscience and Bioengineering, Indian Institute of Technology Jodhpur , Jodhpur, Rajasthan-342011, India
| | - Dolat Singh Shekhawat
- Department of Bioscience and Bioengineering, Indian Institute of Technology Jodhpur , Jodhpur, Rajasthan-342011, India
| | | | - Karunakar Kar
- School of Life Sciences, Jawaharlal Nehru University , New Delhi-110067, India
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Anand BG, Shekhawat DS, Dubey K, Kar K. Uniform, Polycrystalline, and Thermostable Piperine-Coated Gold Nanoparticles to Target Insulin Fibril Assembly. ACS Biomater Sci Eng 2017; 3:1136-1145. [DOI: 10.1021/acsbiomaterials.7b00030] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Bibin G. Anand
- Department
of Bioscience and Bioengineering, Indian Institute of Technology Jodhpur, Rajasthan 342011, India
| | - Dolat S. Shekhawat
- Department
of Bioscience and Bioengineering, Indian Institute of Technology Jodhpur, Rajasthan 342011, India
| | - Kriti Dubey
- Department
of Bioscience and Bioengineering, Indian Institute of Technology Jodhpur, Rajasthan 342011, India
| | - Karunakar Kar
- School
of Life Sciences, Jawaharlal Nehru University, New Delhi 110067, India
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11
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Abstract
Fibrillar collagens (types I, II, III, V, XI, XXIV and XXVII) constitute a sub-group within the collagen family (of which there are 28 types in humans) whose functions are to provide three-dimensional frameworks for tissues and organs. These networks confer mechanical strength as well as signalling and organizing functions through binding to cellular receptors and other components of the extracellular matrix (ECM). Here we describe the structure and assembly of fibrillar collagens, and their procollagen precursors, from the molecular to the tissue level. We show how the structure of the collagen triple-helix is influenced by the amino acid sequence, hydrogen bonding and post-translational modifications, such as prolyl 4-hydroxylation. The numerous steps in the biosynthesis of the fibrillar collagens are reviewed with particular attention to the role of prolyl 3-hydroxylation, collagen chaperones, trimerization of procollagen chains and proteolytic maturation. The multiple steps controlling fibril assembly are then discussed with a focus on the cellular control of this process in vivo. Our current understanding of the molecular packing in collagen fibrils, from different tissues, is then summarized on the basis of data from X-ray diffraction and electron microscopy. These results provide structural insights into how collagen fibrils interact with cell receptors, other fibrillar and non-fibrillar collagens and other ECM components, as well as enzymes involved in cross-linking and degradation.
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Affiliation(s)
- Jordi Bella
- Faculty of Life Sciences, University of Manchester, Oxford Road, Manchester, M13 9PT, UK.
| | - David J S Hulmes
- Tissue Biology and Therapeutic Engineering Unit (UMR5305), CNRS/Université Claude Bernard Lyon 1, Lyon, France
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12
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Gospodarczyk W, Kozak M. The severe impact of in vivo-like microfluidic flow and the influence of gemini surfactants on amyloid aggregation of hen egg white lysozyme. RSC Adv 2017. [DOI: 10.1039/c6ra26675d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
The formation of amyloid plaques is being intensively studied, as this process underlies severe human diseases, including Alzheimer's disease, and the exact mechanism of this specific aggregation has not been resolved yet.
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Affiliation(s)
- W. Gospodarczyk
- Department of Macromolecular Physics
- Faculty of Physics
- Adam Mickiewicz University
- Poznań
- Poland
| | - M. Kozak
- Department of Macromolecular Physics
- Faculty of Physics
- Adam Mickiewicz University
- Poznań
- Poland
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13
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Jayamani J, Shanmugam G. Gelatin as a Potential Inhibitor of Insulin Amyloid Fibril Formation. ChemistrySelect 2016. [DOI: 10.1002/slct.201600692] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Jayaraman Jayamani
- Bioorganic Chemistry Laboratory; CSIR-Central Leather Research Institute, Adyar; Chennai 600 020 India
- Academy of Scientific and Innovative Research (AcSIR), CSIR-CLRI Campus; Sardar Patel Road Chennai 600020 India
| | - Ganesh Shanmugam
- Bioorganic Chemistry Laboratory; CSIR-Central Leather Research Institute, Adyar; Chennai 600 020 India
- Academy of Scientific and Innovative Research (AcSIR), CSIR-CLRI Campus; Sardar Patel Road Chennai 600020 India
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14
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Production of lysozyme nanofibers using deep eutectic solvent aqueous solutions. Colloids Surf B Biointerfaces 2016; 147:36-44. [PMID: 27478961 DOI: 10.1016/j.colsurfb.2016.07.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Revised: 05/23/2016] [Accepted: 07/03/2016] [Indexed: 12/30/2022]
Abstract
Amyloid fibrils have recently gained a lot of attention due to their morphology, functionality and mechanical strength, allowing for their application in nanofiber-based materials, biosensors, bioactive membranes and tissue engineering scaffolds. The in vitro production of amyloid fibrils is still a slow process, thus hampering the massive production of nanofibers and its consequent use. This work presents a new and faster (2-3h) fibrillation method for hen egg white lysozyme (HEWL) using a deep eutectic solvent based on cholinium chloride and acetic acid. Nanofibers with dimensions of 0.5-1μm in length and 0.02-0.1μm in thickness were obtained. Experimental variables such as temperature and pH were also studied, unveiling their influence in fibrillation time and nanofibers morphology. These results open a new scope for protein fibrillation into nanofibers with applications ranging from medicine to soft matter and nanotechnology.
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Labour MN, Vigier S, Lerner D, Marcilhac A, Belamie E. 3D compartmented model to study the neurite-related toxicity of Aβ aggregates included in collagen gels of adaptable porosity. Acta Biomater 2016; 37:38-49. [PMID: 27057929 DOI: 10.1016/j.actbio.2016.04.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Revised: 02/29/2016] [Accepted: 04/03/2016] [Indexed: 12/19/2022]
Abstract
UNLABELLED Insoluble deposits of β-amyloid (Aβ) are associated to neurodegenerative pathologies, in particular Alzheimer's Disease (AD). The toxicity of synthetic amyloid-like peptides has been largely demonstrated and shown to depend upon their aggregation state. However, standard 2D cell culture conditions are not well suited to study the role of the close vicinity of Aβ aggregates and growing neurites in the degenerative process. Here, we have designed a compartmented set-up where model neural cells are differentiated on the surface of Aβ-containing collagen matrices. The average pore size can be modulated, from below 0.2μm to more than 0.5μm by simple treatment with collagenase, to respectively hamper or permit neurite outgrowth towards the depth of the matrix. Dense Aβ aggregates (Congo red and ThT-positive) were obtained inside the collagen matrix with a homogeneous distribution and dimensions similar to those observed in post-mortem brain slices from Alzheimer's patients. The aggregates are not toxic to cells when the pore size is small, in spite of relatively high concentrations of 0.05-0.62mg of peptide per gram of collagen (equivalent to 11.3-113μM). In contrast, on Aβ-containing matrices with large pores, massive neural death is observed when the cells are seeded in the same conditions. It is the first time to our knowledge that Aβ aggregates with a typical morphology of dense plaques are obtained within a porous biomimetic matrix, and are shown to be toxic only when accessible to differentiating cells. STATEMENT OF SIGNIFICANCE Insoluble deposits of β-amyloid (Aβ) are associated to neurodegenerative pathologies, in particular Alzheimer's Disease (AD). In this study, we have formed Aβ aggregates directly inside a biomimetic collagen matrix loaded with growth factors to induce the differentiation of PC12 or SH-SY6Y cells. For the first time, we show that when the contact between cells and Aβ aggregates is allowed by opening up the matrix porosity, the close vicinity with aggregates induces neurite dystrophy. The compartmented 3D culture model developed and used in this study is a valuable tool to study the cytotoxicity of preformed dense Aβ aggregates and proves that contact between the aggregates and neurons is required to induce neurodegenerative processes.
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Lee EC, Kim H, Ditano J, Manion D, King BL, Strange K. Abnormal Osmotic Avoidance Behavior in C. elegans Is Associated with Increased Hypertonic Stress Resistance and Improved Proteostasis. PLoS One 2016; 11:e0154156. [PMID: 27111894 PMCID: PMC4844114 DOI: 10.1371/journal.pone.0154156] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Accepted: 04/09/2016] [Indexed: 11/19/2022] Open
Abstract
Protein function is controlled by the cellular proteostasis network. Proteostasis is energetically costly and those costs must be balanced with the energy needs of other physiological functions. Hypertonic stress causes widespread protein damage in C. elegans. Suppression and management of protein damage is essential for optimal survival under hypertonic conditions. ASH chemosensory neurons allow C. elegans to detect and avoid strongly hypertonic environments. We demonstrate that mutations in osm-9 and osm-12 that disrupt ASH mediated hypertonic avoidance behavior or genetic ablation of ASH neurons are associated with enhanced survival during hypertonic stress. Improved survival is not due to altered systemic volume homeostasis or organic osmolyte accumulation. Instead, we find that osm-9(ok1677) mutant and osm-9(RNAi) worms exhibit reductions in hypertonicity induced protein damage in non-neuronal cells suggesting that enhanced proteostasis capacity may account for improved hypertonic stress resistance in worms with defects in osmotic avoidance behavior. RNA-seq analysis revealed that genes that play roles in managing protein damage are upregulated in osm-9(ok1677) worms. Our findings are consistent with a growing body of work demonstrating that intercellular communication between neuronal and non-neuronal cells plays a critical role in integrating cellular stress resistance with other organismal physiological demands and associated energy costs.
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Affiliation(s)
- Elaine C. Lee
- MDI Biological Laboratory, Salisbury Cove, ME, 04672, United States of America
- University of Connecticut, Storrs, CT, 06269, United States of America
| | - Heejung Kim
- MDI Biological Laboratory, Salisbury Cove, ME, 04672, United States of America
| | - Jennifer Ditano
- MDI Biological Laboratory, Salisbury Cove, ME, 04672, United States of America
| | - Dacie Manion
- MDI Biological Laboratory, Salisbury Cove, ME, 04672, United States of America
| | - Benjamin L. King
- MDI Biological Laboratory, Salisbury Cove, ME, 04672, United States of America
| | - Kevin Strange
- MDI Biological Laboratory, Salisbury Cove, ME, 04672, United States of America
- * E-mail:
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Abe Y, Ohkuri T, Yoshitomi S, Murakami S, Ueda T. Role of the osmolyte taurine on the folding of a model protein, hen egg white lysozyme, under a crowding condition. Amino Acids 2015; 47:909-15. [PMID: 25604803 DOI: 10.1007/s00726-015-1918-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Accepted: 01/06/2015] [Indexed: 12/21/2022]
Abstract
Taurine is one of the osmolytes that maintain the structure of proteins in cells exposed to denaturing environmental stressors. Recently, cryoelectron tomographic analysis of eukaryotic cells has revealed that their cytoplasms are crowded with proteins. Such crowding conditions would be expected to hinder the efficient folding of nascent polypeptide chains. Therefore, we examined the role of taurine on the folding of denatured and reduced lysozyme, as a model protein, under a crowding condition. The results confirmed that taurine had a better effect on protein folding than did β-alanine, which has a similar chemical structure, when the protein to be folded was present at submillimolar concentration. NMR analyses further revealed that under the crowding condition, taurine had more interactions than did β-alanine with the lysozyme molecule in both the folded and denatured states. We concluded that taurine improves the folding of the reduced lysozyme at submillimolar concentration to allow it to interact more favorably with the lysozyme molecule. Thus, the role of taurine, as an osmolyte in vivo, may be to assist in the efficient folding of proteins.
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Affiliation(s)
- Yoshito Abe
- Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, 812-8582, Japan
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