1
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Min JH, Sarlus H, Harris RA. Copper toxicity and deficiency: the vicious cycle at the core of protein aggregation in ALS. Front Mol Neurosci 2024; 17:1408159. [PMID: 39050823 PMCID: PMC11267976 DOI: 10.3389/fnmol.2024.1408159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2024] [Accepted: 06/14/2024] [Indexed: 07/27/2024] Open
Abstract
The pathophysiology of ALS involves many signs of a disruption in copper homeostasis, with both excess free levels and functional deficiency likely occurring simultaneously. This is crucial, as many important physiological functions are performed by cuproenzymes. While it is unsurprising that many ALS symptoms are related to signs of copper deficiency, resulting in vascular, antioxidant system and mitochondrial oxidative respiration deficiencies, there are also signs of copper toxicity such as ROS generation and enhanced protein aggregation. We discuss how copper also plays a key role in proteostasis and interacts either directly or indirectly with many of the key aggregate-prone proteins implicated in ALS, such as TDP-43, C9ORF72, SOD1 and FUS as well as the effect of their aggregation on copper homeostasis. We suggest that loss of cuproprotein function is at the core of ALS pathology, a condition that is driven by a combination of unbound copper and ROS that can either initiate and/or accelerate protein aggregation. This could trigger a positive feedback cycle whereby protein aggregates trigger the aggregation of other proteins in a chain reaction that eventually captures elements of the proteostatic mechanisms in place to counteract them. The end result is an abundance of aggregated non-functional cuproproteins and chaperones alongside depleted intracellular copper stores, resulting in a general lack of cuproenzyme function. We then discuss the possible aetiology of ALS and illustrate how strong risk factors including environmental toxins such as BMAA and heavy metals can functionally behave to promote protein aggregation and disturb copper metabolism that likely drives this vicious cycle in sporadic ALS. From this synthesis, we propose restoration of copper balance using copper delivery agents in combination with chaperones/chaperone mimetics, perhaps in conjunction with the neuroprotective amino acid serine, as a promising strategy in the treatment of this incurable disease.
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Affiliation(s)
- Jin-Hong Min
- Department of Clinical Neuroscience, Karolinska Institutet, Center for Molecular Medicine, Karolinska University Hospital at Solna, Stockholm, Sweden
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2
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Krupa P, La Penna G, Li MS. Amyloid- β Tetramers and Divalent Cations at the Membrane/Water Interface: Simple Models Support a Functional Role. Int J Mol Sci 2023; 24:12698. [PMID: 37628878 PMCID: PMC10454299 DOI: 10.3390/ijms241612698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 08/04/2023] [Accepted: 08/09/2023] [Indexed: 08/27/2023] Open
Abstract
Charge polarization at the membrane interface is a fundamental process in biology. Despite the lower concentration compared to the abundant monovalent ions, the relative abundance of divalent cations (Ca2+, Mg2+, Zn2+, Fe2+, Cu2+) in particular spaces, such as the neuron synapse, raised many questions on the possible effects of free multivalent ions and of the required protection of membranes by the eventual defects caused by the free forms of the cations. In this work, we first applied a recent realistic model of divalent cations to a well-investigated model of a polar lipid bilayer, di-myristoyl phosphatidyl choline (DMPC). The full atomistic model allows a fairly good description of changes in the hydration of charged and polar groups upon the association of cations to lipid atoms. The lipid-bound configurations were analyzed in detail. In parallel, amyloid-β 1-42 (Aβ42) peptides assembled into tetramers were modeled at the surface of the same bilayer. Two of the protein tetramers' models were loaded with four Cu2+ ions, the latter bound as in DMPC-free Aβ42 oligomers. The two Cu-bound models differ in the binding topology: one with each Cu ion binding each of the monomers in the tetramer; one with pairs of Cu ions linking two monomers into dimers, forming tetramers as dimers of dimers. The models here described provide hints on the possible role of Cu ions in synaptic plasticity and of Aβ42 oligomers in storing the same ions away from lipids. The release of structurally disordered peptides in the synapse can be a mechanism to recover ion homeostasis and lipid membranes from changes in the divalent cation concentration.
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Affiliation(s)
- Pawel Krupa
- Institute of Physics, Polish Academy of Sciences, 02-668 Warsaw, Poland; (P.K.); (M.S.L.)
| | - Giovanni La Penna
- Institute of Chemistry of Organometallic Compounds, National Research Council, 50019 Sesto Fiorentino, Italy
- Section of Roma Tor Vergata, National Institute of Nuclear Physics, 00133 Roma, Italy
| | - Mai Suan Li
- Institute of Physics, Polish Academy of Sciences, 02-668 Warsaw, Poland; (P.K.); (M.S.L.)
- Institute for Computational Science and Technology, Ho Chi Minh City 700000, Vietnam
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3
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Pietz S, Kolbenschlag S, Röder N, Roodt AP, Steinmetz Z, Manfrin A, Schwenk K, Schulz R, Schäfer RB, Zubrod JP, Bundschuh M. Subsidy Quality Affects Common Riparian Web-Building Spiders: Consequences of Aquatic Contamination and Food Resource. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2023; 42:1346-1358. [PMID: 36946335 DOI: 10.1002/etc.5614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 02/21/2023] [Accepted: 03/16/2023] [Indexed: 05/27/2023]
Abstract
Anthropogenic stressors can affect the emergence of aquatic insects. These insects link aquatic and adjacent terrestrial food webs, serving as high-quality subsidy to terrestrial consumers, such as spiders. While previous studies have demonstrated that changes in the emergence biomass and timing may propagate across ecosystem boundaries, the physiological consequences of altered subsidy quality for spiders are largely unknown. We used a model food chain to study the potential effects of subsidy quality: Tetragnatha spp. were exclusively fed with emergent Chironomus riparius cultured in the absence or presence of either copper (Cu), Bacillus thuringiensis var. israelensis (Bti), or a mixture of synthetic pesticides paired with two basal resources (Spirulina vs. TetraMin®) of differing quality in terms of fatty acid (FA) composition. Basal resources shaped the FA profile of chironomids, whereas their effect on the FA profile of spiders decreased, presumably due to the capacity of both chironomids and spiders to modify (dietary) FA. In contrast, aquatic contaminants had negligible effects on prey FA profiles but reduced the content of physiologically important polyunsaturated FAs, such as 20:4n-6 (arachidonic acid) and 20:5n-3 (eicosapentaenoic acid), in spiders by approximately 30% in Cu and Bti treatments. This may have contributed to the statistically significant decline (40%-50%) in spider growth. The observed effects in spiders are likely related to prey nutritional quality because biomass consumption by spiders was, because of our experimental design, constant. Analyses of additional parameters that describe the nutritional quality for consumers such as proteins, carbohydrates, and the retention of contaminants may shed further light on the underlying mechanisms. Our results highlight that aquatic contaminants can affect the physiology of riparian spiders, likely by altering subsidy quality, with potential implications for terrestrial food webs. Environ Toxicol Chem 2023;42:1346-1358. © 2023 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC.
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Affiliation(s)
- Sebastian Pietz
- iES Landau, Institute for Environmental Sciences, RPTU Kaiserslautern-Landau, Landau, Germany
| | - Sara Kolbenschlag
- iES Landau, Institute for Environmental Sciences, RPTU Kaiserslautern-Landau, Landau, Germany
| | - Nina Röder
- iES Landau, Institute for Environmental Sciences, RPTU Kaiserslautern-Landau, Landau, Germany
| | - Alexis P Roodt
- iES Landau, Institute for Environmental Sciences, RPTU Kaiserslautern-Landau, Landau, Germany
| | - Zacharias Steinmetz
- iES Landau, Institute for Environmental Sciences, RPTU Kaiserslautern-Landau, Landau, Germany
| | - Alessandro Manfrin
- iES Landau, Institute for Environmental Sciences, RPTU Kaiserslautern-Landau, Landau, Germany
| | - Klaus Schwenk
- iES Landau, Institute for Environmental Sciences, RPTU Kaiserslautern-Landau, Landau, Germany
| | - Ralf Schulz
- iES Landau, Institute for Environmental Sciences, RPTU Kaiserslautern-Landau, Landau, Germany
| | - Ralf B Schäfer
- iES Landau, Institute for Environmental Sciences, RPTU Kaiserslautern-Landau, Landau, Germany
| | - Jochen P Zubrod
- iES Landau, Institute for Environmental Sciences, RPTU Kaiserslautern-Landau, Landau, Germany
- Zubrod Environmental Data Science, Landau, Germany
| | - Mirco Bundschuh
- iES Landau, Institute for Environmental Sciences, RPTU Kaiserslautern-Landau, Landau, Germany
- Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden
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4
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Wu D, Saleem M, He T, He G. The Mechanism of Metal Homeostasis in Plants: A New View on the Synergistic Regulation Pathway of Membrane Proteins, Lipids and Metal Ions. MEMBRANES 2021; 11:membranes11120984. [PMID: 34940485 PMCID: PMC8706360 DOI: 10.3390/membranes11120984] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 12/04/2021] [Accepted: 12/11/2021] [Indexed: 12/15/2022]
Abstract
Heavy metal stress (HMS) is one of the most destructive abiotic stresses which seriously affects the growth and development of plants. Recent studies have shown significant progress in understanding the molecular mechanisms underlying plant tolerance to HMS. In general, three core signals are involved in plants' responses to HMS; these are mitogen-activated protein kinase (MAPK), calcium, and hormonal (abscisic acid) signals. In addition to these signal components, other regulatory factors, such as microRNAs and membrane proteins, also play an important role in regulating HMS responses in plants. Membrane proteins interact with the highly complex and heterogeneous lipids in the plant cell environment. The function of membrane proteins is affected by the interactions between lipids and lipid-membrane proteins. Our review findings also indicate the possibility of membrane protein-lipid-metal ion interactions in regulating metal homeostasis in plant cells. In this review, we investigated the role of membrane proteins with specific substrate recognition in regulating cell metal homeostasis. The understanding of the possible interaction networks and upstream and downstream pathways is developed. In addition, possible interactions between membrane proteins, metal ions, and lipids are discussed to provide new ideas for studying metal homeostasis in plant cells.
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Affiliation(s)
- Danxia Wu
- College of Agricultural, Guizhou University, Guiyang 550025, China;
| | - Muhammad Saleem
- Department of Biological Sciences, Alabama State University, Montgomery, AL 36104, USA;
| | - Tengbing He
- College of Agricultural, Guizhou University, Guiyang 550025, China;
- Institute of New Rural Development, West Campus, Guizhou University, Guiyang 550025, China
- Correspondence: (T.H.); (G.H.)
| | - Guandi He
- College of Agricultural, Guizhou University, Guiyang 550025, China;
- Correspondence: (T.H.); (G.H.)
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5
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The Molecular Basis of Acinetobacter baumannii Cadmium Toxicity and Resistance. Appl Environ Microbiol 2021; 87:e0171821. [PMID: 34495707 DOI: 10.1128/aem.01718-21] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Acinetobacter species are ubiquitous Gram-negative bacteria that can be found in water, in soil, and as commensals of the human skin. The successful inhabitation of Acinetobacter species in diverse environments is primarily attributable to the expression of an arsenal of stress resistance determinants, which includes an extensive repertoire of metal ion efflux systems. Metal ion homeostasis in the hospital pathogen Acinetobacter baumannii contributes to pathogenesis; however, insights into its metal ion transporters for environmental persistence are lacking. Here, we studied the impact of cadmium stress on A. baumannii. Our functional genomics and independent mutant analyses revealed a primary role for CzcE, a member of the cation diffusion facilitator (CDF) superfamily, in resisting cadmium stress. We also show that the CzcCBA heavy metal efflux system contributes to cadmium efflux. Collectively, these systems provide A. baumannii with a comprehensive cadmium translocation pathway from the cytoplasm to the periplasm and subsequently the extracellular space. Furthermore, analysis of the A. baumannii metallome under cadmium stress showed zinc depletion, as well as copper enrichment, both of which are likely to influence cellular fitness. Overall, this work provides new knowledge on the role of a broad arsenal of membrane transporters in A. baumannii metal ion homeostasis. IMPORTANCE Cadmium toxicity is a widespread problem, yet the interaction of this heavy metal with biological systems is poorly understood. Some microbes have evolved traits to proactively counteract cadmium toxicity, including Acinetobacter baumannii, which is notorious for persisting in harsh environments. Here, we show that A. baumannii utilizes a dedicated cadmium efflux protein in concert with a system that is primarily attuned to zinc efflux to efficiently overcome cadmium stress. The molecular characterization of A. baumannii under cadmium stress revealed how active cadmium efflux plays a key role in preventing the dysregulation of bacterial metal ion homeostasis, which appeared to be a primary means by which cadmium exerts toxicity upon the bacterium.
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6
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Sacan O, Turkyilmaz IB, Bayrak BB, Mutlu O, Akev N, Yanardag R. Protective role of zinc in liver damage in experimental diabetes demonstrated via different biochemical parameters. J Biochem Mol Toxicol 2020; 35:e22617. [PMID: 32864810 DOI: 10.1002/jbt.22617] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 08/10/2020] [Accepted: 08/15/2020] [Indexed: 12/25/2022]
Abstract
Diabetes mellitus is a serious worldwide metabolic disease, which is accompanied by hyperglycaemia and affects all organs and body system. Zinc (Zn) is a basic cofactor for many enzymes, which also plays an important role in stabilising the structure of insulin. Liver is the most important target organ after pancreas in diabetic complications. In this study, we aimed to investigate the protective role of Zn in liver damage in streptozotocin (STZ)-induced diabetes mellitus. There are four experimental groups of female Swiss albino rats: group I: control; group II: control + ZnSO4 ; group III: STZ-induced diabetic animals and group IV: STZ-diabetic + ZnSO4 . To induce diabetes, STZ was injected intraperitoneally (65 mg/kg). ZnSO4 (100 mg/kg) was given daily to groups II and IV by gavage for 60 days. At the end of the experiment, rats were killed under anaesthesia and liver tissues were collected. In the diabetic group, hexose, hexosamine, fucose, sialic acid levels, arginase, adenosine deaminase, tissue factor activities and protein carbonyl levels increased, whereas catalase, superoxide dismutase, glutathione-S-transferase, glutathione peroxidase, glutathione reductase and Na+ /K+ -ATPase activities decreased. The administration of Zn to the diabetic group reversed all the negative effects/activities. According to these results, we can suggest that Zn has a protective role against STZ-induced diabetic liver damage.
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Affiliation(s)
- Ozlem Sacan
- Division of Biochemistry, Department of Chemistry, Faculty of Engineering, Istanbul University-Cerrahpasa, Istanbul, Turkey
| | - Ismet Burcu Turkyilmaz
- Division of Biochemistry, Department of Chemistry, Faculty of Engineering, Istanbul University-Cerrahpasa, Istanbul, Turkey
| | - Bertan Boran Bayrak
- Division of Biochemistry, Department of Chemistry, Faculty of Engineering, Istanbul University-Cerrahpasa, Istanbul, Turkey
| | - Ozgur Mutlu
- Division of Biochemistry, Department of Chemistry, Faculty of Engineering, Istanbul University-Cerrahpasa, Istanbul, Turkey
| | - Nuriye Akev
- Department of Biochemistry, Faculty of Pharmacy, Istanbul University, Istanbul, Turkey
| | - Refiye Yanardag
- Division of Biochemistry, Department of Chemistry, Faculty of Engineering, Istanbul University-Cerrahpasa, Istanbul, Turkey
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7
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Techo T, Jindarungrueng S, Tatip S, Limcharoensuk T, Pokethitiyook P, Kruatrachue M, Auesukaree C. Vacuolar H + -ATPase is involved in preventing heavy metal-induced oxidative stress in Saccharomyces cerevisiae. Environ Microbiol 2020; 22:2403-2418. [PMID: 32291875 DOI: 10.1111/1462-2920.15022] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2019] [Accepted: 04/12/2020] [Indexed: 12/31/2022]
Abstract
In Saccharomyces cerevisiae, vacuolar H+ -ATPase (V-ATPase) involved in the regulation of intracellular pH homeostasis has been shown to be important for tolerances to cadmium, cobalt and nickel. However, the molecular mechanism underlying the protective role of V-ATPase against these metals remains unclear. In this study, we show that cadmium, cobalt and nickel disturbed intracellular pH balance by triggering cytosolic acidification and vacuolar alkalinization, likely via their membrane permeabilizing effects. Since V-ATPase plays a crucial role in pumping excessive cytosolic protons into the vacuole, the metal-sensitive phenotypes of the Δvma2 and Δvma3 mutants lacking V-ATPase activity were supposed to result from highly acidified cytosol. However, we found that the metal-sensitive phenotypes of these mutants were caused by increased production of reactive oxygen species, likely as a result of decreased expression and activities of manganese superoxide dismutase and catalase. In addition, the loss of V-ATPase function led to aberrant vacuolar morphology and defective endocytic trafficking. Furthermore, the sensitivities of the Δvma mutants to other chemical compounds (i.e. acetic acid, H2 O2 , menadione, tunicamycin and cycloheximide) were a consequence of increased endogenous oxidative stress. These findings, therefore, suggest the important role of V-ATPase in preventing endogenous oxidative stress induced by metals and other chemical compounds.
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Affiliation(s)
- Todsapol Techo
- Department of Biology, Faculty of Science, Mahidol University, Bangkok, Thailand.,Center of Excellence on Environmental Health and Toxicology, CHE, Ministry of Education, Bangkok, Thailand.,Mahidol University-Osaka University Collaborative Research Center for Bioscience and Biotechnology (MU-OU:CRC), Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Supat Jindarungrueng
- Department of Biology, Faculty of Science, Mahidol University, Bangkok, Thailand.,Center of Excellence on Environmental Health and Toxicology, CHE, Ministry of Education, Bangkok, Thailand
| | - Supinda Tatip
- Department of Biology, Faculty of Science, Mahidol University, Bangkok, Thailand.,Center of Excellence on Environmental Health and Toxicology, CHE, Ministry of Education, Bangkok, Thailand.,Mahidol University-Osaka University Collaborative Research Center for Bioscience and Biotechnology (MU-OU:CRC), Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Tossapol Limcharoensuk
- Department of Biology, Faculty of Science, Mahidol University, Bangkok, Thailand.,Center of Excellence on Environmental Health and Toxicology, CHE, Ministry of Education, Bangkok, Thailand.,Mahidol University-Osaka University Collaborative Research Center for Bioscience and Biotechnology (MU-OU:CRC), Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Prayad Pokethitiyook
- Department of Biology, Faculty of Science, Mahidol University, Bangkok, Thailand.,Center of Excellence on Environmental Health and Toxicology, CHE, Ministry of Education, Bangkok, Thailand
| | - Maleeya Kruatrachue
- Department of Biology, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Choowong Auesukaree
- Department of Biology, Faculty of Science, Mahidol University, Bangkok, Thailand.,Center of Excellence on Environmental Health and Toxicology, CHE, Ministry of Education, Bangkok, Thailand.,Mahidol University-Osaka University Collaborative Research Center for Bioscience and Biotechnology (MU-OU:CRC), Faculty of Science, Mahidol University, Bangkok, Thailand.,Department of Biotechnology, Faculty of Science, Mahidol University, Bangkok, Thailand
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8
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Huy Pham DQ, Krupa P, Nguyen HL, La Penna G, Li MS. Computational Model to Unravel the Function of Amyloid-β Peptides in Contact with a Phospholipid Membrane. J Phys Chem B 2020; 124:3300-3314. [DOI: 10.1021/acs.jpcb.0c00771] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Dinh Quoc Huy Pham
- Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warsaw, Poland
| | - Pawel Krupa
- Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warsaw, Poland
| | - Hoang Linh Nguyen
- Institute for Computational Science and Technology, 6 Quarter, Linh Trung Ward, Thu
Duc District, 00133 Ho Chi Minh City, Vietnam
| | - Giovanni La Penna
- National Research Council of Italy (CNR), Institute for Chemistry of Organometallic Compounds (ICCOM), 50019 Florence, Italy
- National Institute for Nuclear Physics (INFN), Section of Roma-Tor Vergata, 00186 Roma, Italy
| | - Mai Suan Li
- Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warsaw, Poland
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9
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Kawahara M, Kato-Negishi M, Tanaka KI. Amyloids: Regulators of Metal Homeostasis in the Synapse. Molecules 2020; 25:molecules25061441. [PMID: 32210005 PMCID: PMC7145306 DOI: 10.3390/molecules25061441] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 03/17/2020] [Accepted: 03/20/2020] [Indexed: 12/11/2022] Open
Abstract
Conformational changes in amyloidogenic proteins, such as β-amyloid protein, prion proteins, and α-synuclein, play a critical role in the pathogenesis of numerous neurodegenerative diseases, including Alzheimer’s disease, prion disease, and Lewy body disease. The disease-associated proteins possess several common characteristics, including the ability to form amyloid oligomers with β-pleated sheet structure, as well as cytotoxicity, although they differ in amino acid sequence. Interestingly, these amyloidogenic proteins all possess the ability to bind trace metals, can regulate metal homeostasis, and are co-localized at the synapse, where metals are abundantly present. In this review, we discuss the physiological roles of these amyloidogenic proteins in metal homeostasis, and we propose hypothetical models of their pathogenetic role in the neurodegenerative process as the loss of normal metal regulatory functions of amyloidogenic proteins. Notably, these amyloidogenic proteins have the capacity to form Ca2+-permeable pores in membranes, suggestive of a toxic gain of function. Therefore, we focus on their potential role in the disruption of Ca2+ homeostasis in amyloid-associated neurodegenerative diseases.
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10
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Arambourou H, Llorente L, Moreno-Ocio I, Herrero Ó, Barata C, Fuertes I, Delorme N, Méndez-Fernández L, Planelló R. Exposure to heavy metal-contaminated sediments disrupts gene expression, lipid profile, and life history traits in the midge Chironomus riparius. WATER RESEARCH 2020; 168:115165. [PMID: 31614238 DOI: 10.1016/j.watres.2019.115165] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Revised: 09/28/2019] [Accepted: 10/05/2019] [Indexed: 06/10/2023]
Abstract
Despite the concern about anthropogenic heavy metal accumulation, there remain few multi-level ecotoxicological studies to evaluate their effects in fluvial ecosystems. The toxicity of field-collected sediments exhibiting a gradient of heavy metal contamination (Cd, Pb, and Zn) was assessed in Chironomus riparius. For this purpose, larvae were exposed throughout their entire life cycle to these sediments, and toxic effects were measured at different levels of biological organization, from the molecular (lipidomic analysis and transcriptional profile) to the whole organism response (respiration rate, shape markers, and emergence rate). Alterations in the activity of relevant genes, as well as an increase of storage lipids and decrease in membrane fluidity, were detected in larvae exposed to the most contaminated sediments. Moreover, reduced larval and adult mass, decrease of larval respiration rate, and delayed emergence were observed, along with increased mentum and mandible size in larvae and decreased wing loading in adults. This study points out the deleterious effects of heavy metal exposure at various levels of biological organization and provides some clues regarding the mode of toxic action. This integrative approach provides new insights into the multi-level effects on aquatic insects exposed to heavy metal mixtures in field sediments, providing useful tools for ecological risk assessment in freshwater ecosystems.
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Affiliation(s)
| | - Lola Llorente
- Biology and Environmental Toxicology Group, Faculty of Science, Universidad Nacional de Educación a Distancia (UNED), Madrid, Spain
| | - Iñigo Moreno-Ocio
- Department of Zoology and Animal Cellular Biology, University of the Basque Country (UPV/EHU), Leioa, Spain
| | - Óscar Herrero
- Biology and Environmental Toxicology Group, Faculty of Science, Universidad Nacional de Educación a Distancia (UNED), Madrid, Spain
| | - Carlos Barata
- Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research (IDAEA), Spanish Research Council (CSIC), Barcelona, Spain
| | - Inmaculada Fuertes
- Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research (IDAEA), Spanish Research Council (CSIC), Barcelona, Spain
| | | | - Leire Méndez-Fernández
- Department of Plant Biology and Ecology, University of the Basque Country (UPV/EHU), Leioa, Spain
| | - Rosario Planelló
- Biology and Environmental Toxicology Group, Faculty of Science, Universidad Nacional de Educación a Distancia (UNED), Madrid, Spain.
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11
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Fernandez M, Paulucci NS, Peppino Margutti M, Biasutti AM, Racagni GE, Villasuso AL, Agostini E, González PS. Membrane Rigidity and Phosphatidic Acid (PtdOH) Signal: Two Important Events in Acinetobacter guillouiae SFC 500-1A Exposed to Chromium(VI) and Phenol. Lipids 2019; 54:557-570. [PMID: 31475368 DOI: 10.1002/lipd.12187] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Revised: 07/31/2019] [Accepted: 07/31/2019] [Indexed: 11/06/2022]
Abstract
The remodeling of membrane lipids is a mechanism that allows microorganisms to survive in unfavorable environments such as industrial effluents, which often contain inorganic and organic pollutants, like chromium and phenol. In the present work, we evaluated the effect of Cr(VI) and phenol on the membrane of Acinetobacter guillouiae SFC 500-1A, a bacterial strain isolated from tannery sediments where such pollutants can be found. The presence of lipid kinases and phospholipases and the changes in their activities under exposure to these pollutants were determined. Cr(VI) and Cr(VI) + phenol caused the membrane to become more rigid for up to 16 h after exposure. This could be due to an increase in cardiolipin (Ptd2 Gro) and a decrease in phosphatidylethanolamine (PtdEtn), which are indicative of more order and rigidity in the membrane. Increased phospholipase A activity (PLA, EC 3.1.1.4) could be responsible for the decrease in PtdEtn levels. Moreover, our results indicate that Cr(VI) and Cr(VI) + phenol trigger the phosphatidic acid (PtdOH) signal. The finding of significantly increased phosphatidylinositol-4-phosphate (PtdIns-4-P) levels means this is likely achieved via PtdIns-PLC/DGK. This report provides the first evidence that A. guillouiae SFC 500-1A is able to sense Cr(VI) and phenol, transduce this signal through changes in the physical state of the membrane, and trigger lipid-signaling events.
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Affiliation(s)
- Marilina Fernandez
- Departamento de Biología Molecular, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina
| | - Natalia S Paulucci
- Departamento de Biología Molecular, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina
| | - Micaela Peppino Margutti
- Departamento de Biología Molecular, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina
| | - Alicia M Biasutti
- Departamento de Química-FCEFQyN, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina
| | - Graciela E Racagni
- Departamento de Biología Molecular, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina
| | - Ana L Villasuso
- Departamento de Biología Molecular, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina
| | - Elizabeth Agostini
- Departamento de Biología Molecular, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina
| | - Paola S González
- Departamento de Biología Molecular, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina
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12
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Miner GE, Sullivan KD, Zhang C, Hurst LR, Starr ML, Rivera-Kohr DA, Jones BC, Guo A, Fratti RA. Copper blocks V-ATPase activity and SNARE complex formation to inhibit yeast vacuole fusion. Traffic 2019; 20:841-850. [PMID: 31368617 DOI: 10.1111/tra.12683] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Revised: 07/22/2019] [Accepted: 07/22/2019] [Indexed: 12/23/2022]
Abstract
The accumulation of copper in organisms can lead to altered functions of various pathways and become cytotoxic through the generation of reactive oxygen species. In yeast, cytotoxic metals such as Hg+ , Cd2+ and Cu2+ are transported into the lumen of the vacuole through various pumps. Copper ions are initially transported into the cell by the copper transporter Ctr1 at the plasma membrane and sequestered by chaperones and other factors to prevent cellular damage by free cations. Excess copper ions can subsequently be transported into the vacuole lumen by an unknown mechanism. Transport across membranes requires the reduction of Cu2+ to Cu+ . Labile copper ions can interact with membranes to alter fluidity, lateral phase separation and fusion. Here we found that CuCl2 potently inhibited vacuole fusion by blocking SNARE pairing. This was accompanied by the inhibition of V-ATPase H+ pumping. Deletion of the vacuolar reductase Fre6 had no effect on the inhibition of fusion by copper. This suggests that Cu2+ is responsible for the inhibition of vacuole fusion and V-ATPase function. This notion is supported by the differential effects of chelators. The Cu2+ -specific chelator triethylenetetramine rescued fusion, whereas the Cu+ -specific chelator bathocuproine disulfonate had no effect on the inhibited fusion.
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Affiliation(s)
- Gregory E Miner
- Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois
| | - Katherine D Sullivan
- Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois
| | - Chi Zhang
- Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois
| | - Logan R Hurst
- Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois
| | - Matthew L Starr
- Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois
| | - David A Rivera-Kohr
- Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois
| | - Brandon C Jones
- Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois
| | - Annie Guo
- Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois
| | - Rutilio A Fratti
- Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois.,Center for Biophysics and Quantitative Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois
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13
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Barman S, Srinivasan K. Ameliorative effect of zinc supplementation on compromised small intestinal health in streptozotocin-induced diabetic rats. Chem Biol Interact 2019; 307:37-50. [DOI: 10.1016/j.cbi.2019.04.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Revised: 01/04/2019] [Accepted: 04/15/2019] [Indexed: 01/29/2023]
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14
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Aster I, Barth LM, Rink L, Wessels I. Alterations in membrane fluidity are involved in inhibition of GM-CSF-induced signaling in myeloid cells by zinc. J Trace Elem Med Biol 2019; 54:214-220. [PMID: 31109615 DOI: 10.1016/j.jtemb.2019.04.018] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 04/24/2019] [Accepted: 04/25/2019] [Indexed: 01/09/2023]
Abstract
Zinc has a strong influence on the function of the immune system and is a driving factor for immune cell development. In this regard, studies revealed cell type specific effects of zinc. During zinc deficiency for example, development and activity of myeloid cells seems to be prioritized at the cost of cells from the lymphoid lineage. In T-cells, the altered proliferation was found to be due to zinc's effect on IL-2-induced signaling processes, but in contrast to lymphoid cells, effects of zinc homeostasis on growth-factor-induced signaling in myeloid cells have not been investigated yet. The granulocyte-macrophage colony-stimulating factor (GM-CSF) is one of the major factors inducing monopoiesis. Considering the structural similarities between the GM-CSF receptor and those of the IL-receptor family as well as a similar set of signaling molecules involved, an impact of zinc on the GM-CSF signaling seems to be likely. Therefore, the effect of zinc on GM-CSF-induced signaling molecules was investigated here, using U937 cells as a model myeloid cell line. GM-CSF stimulation significantly increased STAT5 phosphorylation which was prevented completely by pre-incubation with zinc and pyrithione. U937 cells showed a strong pre-activation regarding c-Raf, which was significantly decreased by zinc and pyrithione incubation, independently from GM-CSF stimulation. As current literature was not sufficient to explain the observed effects, we hypothesized an altered receptor-complex assembly. As membrane composition and plasticity, subsumed under the term of membrane fluidity, was found to affect receptor multimerization, the impact of zinc on membrane fluidity was considered as a completely novel approach. Indeed, addition of zinc also decreased GM-CSFR expression on the cell surface and most interestingly altered membrane fluidity. In conclusion, we hypothesize that the incubation with zinc causes an alteration of membrane fluidity that hinders efficient receptor assembly as well as phosphorylation of signal molecules and therefore signal transduction.
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Affiliation(s)
- Isabell Aster
- Institute of Immunology, Medical Faculty, RWTH Aachen University, Pauwelsstr. 30, D-52074 Aachen, Germany
| | - Lisa-Marie Barth
- Institute of Immunology, Medical Faculty, RWTH Aachen University, Pauwelsstr. 30, D-52074 Aachen, Germany
| | - Lothar Rink
- Institute of Immunology, Medical Faculty, RWTH Aachen University, Pauwelsstr. 30, D-52074 Aachen, Germany
| | - Inga Wessels
- Institute of Immunology, Medical Faculty, RWTH Aachen University, Pauwelsstr. 30, D-52074 Aachen, Germany.
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15
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Zhang J, Li Q, Wu Y, Wang D, Xu L, Zhang Y, Wang S, Wang T, Liu F, Zaky MY, Hou S, Liu S, Zou K, Lei H, Zou L, Zhang Y, Liu H. Cholesterol content in cell membrane maintains surface levels of ErbB2 and confers a therapeutic vulnerability in ErbB2-positive breast cancer. Cell Commun Signal 2019; 17:15. [PMID: 30786890 PMCID: PMC6383291 DOI: 10.1186/s12964-019-0328-4] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Accepted: 02/13/2019] [Indexed: 11/30/2022] Open
Abstract
Background ErbB2 overexpression identifies a subset of breast cancer as ErbB2-positive and is frequently associated with poor clinical outcomes. As a membrane-embedded receptor tyrosine kinase, cell surface levels of ErbB2 are regulated dynamically by membrane physical properties. The present study aims to investigate the influence of membrane cholesterol contents on ErbB2 status and cellular responses to its tyrosine kinase inhibitors. Methods The cholesterol abundance was examined in ErbB2-positive breast cancer cells using filipin staining. Cellular ErbB2 localizations were investigated by immunofluorescence with altered membrane cholesterol contents. The inhibitory effects of the cholesterol-lowering drug lovastatin were assessed using cell proliferation, apoptosis, immunoblotting and immunofluorescence assays. The synergistic effects of lovastatin with the ErbB2 inhibitor lapatinib were evaluated using an ErbB2-positive breast cancer xenograft mouse model. Results Membrane cholesterol contents positively correlated with cell surface distribution of ErbB2 through increasing the rigidity and decreasing the fluidity of cell membranes. Reduction in cholesterol abundance assisted the internalization and degradation of ErbB2. The cholesterol-lowering drug lovastatin significantly potentiated the inhibitory effects of ErbB2 kinase inhibitors, accompanied with enhanced ErbB2 endocytosis. Lovastatin also synergized with lapatinib to strongly suppress the in vivo growth of ErbB2-positive breast cancer xenografts. Conclusion The cell surface distribution of ErbB2 was closely regulated by membrane physical properties governed by cholesterol contents. The cholesterol-lowering medications can hence be exploited for potential combinatorial therapies with ErbB2 kinase inhibitors in the clinical treatment of ErbB2-positive breast cancer.
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Affiliation(s)
- Jinrui Zhang
- Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
| | - Qiong Li
- Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China.,The Second Affiliated Hospital, Dalian Medical University, Dalian, China
| | - Yueguang Wu
- Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
| | - Duchuang Wang
- Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
| | - Lu Xu
- The Second Affiliated Hospital, Dalian Medical University, Dalian, China
| | - Yang Zhang
- Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
| | - Shanshan Wang
- Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
| | - Taishu Wang
- Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
| | - Fang Liu
- Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
| | - Mohamed Y Zaky
- Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China.,Molecular Physiology Division, Department of Zoology, Faculty of Science, Beni-Suef University, Beni Suef, Egypt
| | - Shuai Hou
- Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
| | - Shuyan Liu
- Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
| | - Kun Zou
- Department of Radiotherapy Oncology, the First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Haixin Lei
- Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
| | - Lijuan Zou
- The Second Affiliated Hospital, Dalian Medical University, Dalian, China
| | - Yingqiu Zhang
- Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China.
| | - Han Liu
- Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China. .,Cancer Biotherapy & Translational Medicine Center of Liaoning Province, Dalian Medical University, Dalian, China.
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16
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Filice FP, Ding Z. Analysing single live cells by scanning electrochemical microscopy. Analyst 2019; 144:738-752. [DOI: 10.1039/c8an01490f] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Scanning electrochemical microscopy (SECM) offers single live cell activities along its topography toward cellular physiology and pathology.
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Affiliation(s)
- Fraser P. Filice
- Department of Chemistry
- The University of Western Ontario
- London
- Canada
| | - Zhifeng Ding
- Department of Chemistry
- The University of Western Ontario
- London
- Canada
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17
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Kumar Babele P. Zinc oxide nanoparticles impose metabolic toxicity by de-regulating proteome and metabolome in Saccharomyces cerevisiae. Toxicol Rep 2018; 6:64-73. [PMID: 30581761 PMCID: PMC6297892 DOI: 10.1016/j.toxrep.2018.12.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2018] [Revised: 11/28/2018] [Accepted: 12/05/2018] [Indexed: 12/31/2022] Open
Abstract
Untargeted proteomic and metabolic approaches provide complete toxicity assessment. ZnO-NPs de-regulate the proteome and metabolome of S. cerevisiae. ZnO-NPs affect the key metabolites of central metabolic pathways. Protein and/or metabolite can be used as biomarker specific to the ZnO-NPs induced toxicity.
As zinc oxide nanoparticles are being increasingly used in various applications, it is important to assess their potential toxic implications. Stress responses and adaptations are primarily controlled by modulation in cellular proteins (enzyme) and concentration of metabolites. To date proteomics or metabolomics applications in nanotoxicity assessment have been applied to a restricted extent. Here we utilized 2DE and 1H NMR based proteomics and metabolomics respectively to delineate the toxicity mechanism of zinc oxide nanoparticles (ZnO-NPs) in budding yeast S. cerevisiae. We found that the physiological and metabolic processes were altered in the S. cerevisiae upon ZnO-NPs exposure. Almost 40% proteins were down-regulated in ZnO-NPs (10 mg L−1) exposed cell as compared to control. Metabolomics and system biology based pathway analysis, revealed that ZnO-NPs repressed a wide range of key metabolites involved in central carbon metabolism, cofactors synthesis, amino acid and fatty acid biosynthesis, purines and pyrimidines, nucleoside and nucleotide biosynthetic pathways. These metabolic changes may be associated with the energy metabolism, antioxidation, DNA and protein damage and membrane stability. We concluded that untargeted proteomic and metabolic approaches provide more complete measurements and suggest probable molecular mechanisms of nanomaterials toxicity.
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Affiliation(s)
- Piyoosh Kumar Babele
- Department of Biological Sciences, Indian Institute of Science Education and Research Bhopal, Bhauri, Bhopal, 462066, Madhya Pradesh, India
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18
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Rodríguez-Seijo A, da Costa JP, Rocha-Santos T, Duarte AC, Pereira R. Oxidative stress, energy metabolism and molecular responses of earthworms (Eisenia fetida) exposed to low-density polyethylene microplastics. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:33599-33610. [PMID: 30276680 DOI: 10.1007/s11356-018-3317-z] [Citation(s) in RCA: 94] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 09/24/2018] [Indexed: 06/08/2023]
Abstract
Soils are both a sink and a pathway of plastic wastes, but there is a great lack of knowledge regarding their impacts on soil biota. To tackle the mechanisms of toxicity of these contaminants to soil invertebrates, earthworms (Eisenia fetida Savigny, 1826) were exposed during 28 days to different concentrations of low-density polyethylene microplastics (62, 125, 250, 500 and 1000 mg MPs kg-1 soildw) with sizes ranging between 250 and 1000 μm, in an artificial soil. The ecotoxicological responses were evaluated by analysing various oxidative stress biomarkers (catalase, glutathione S-transferase and thiobarbituric acid reactive substances), a biomarker of energy metabolism (lactate dehydrogenase) and overall organism molecular changes by Fourier transform infrared spectrometry (FTIR) and nuclear magnetic resonance (NMR) analyses. Significant effects resulting from an unbalanced oxidative stress system, expressed in terms of thiobarbituric acid reactive substances levels were recorded on earthworms exposed at the three highest concentrations tested. Despite that, no significant changes were recorded on the molecular profiles of earthworms by FTIR-ATR. NMR analysis pointed out for differences from the control, only for earthworms exposed to the lowest concentration of MPs. Considering that stress responses are complex, and involve multiple mechanisms, a cluster analysis taking into account all the parameters assessed, clearly identified two groups of earthworms separated by the concentration of 250 mg MPs kg-1 soildw, above each meaningful effects were recorded.
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Affiliation(s)
- Andrés Rodríguez-Seijo
- Department of Biology & GreenUPorto, Faculty of Sciences of the University of Porto, Rua do Campo Alegre S/N, 4169-007, Porto, Portugal.
- Department of Plant Biology and Soil Science, Universidade de Vigo, 36310, Vigo, Spain.
| | - João P da Costa
- Department of Chemistry & CESAM, University of Aveiro, 3810-193, Aveiro, Portugal
| | - Teresa Rocha-Santos
- Department of Chemistry & CESAM, University of Aveiro, 3810-193, Aveiro, Portugal
| | - Armando C Duarte
- Department of Chemistry & CESAM, University of Aveiro, 3810-193, Aveiro, Portugal
| | - Ruth Pereira
- Department of Biology & GreenUPorto, Faculty of Sciences of the University of Porto, Rua do Campo Alegre S/N, 4169-007, Porto, Portugal
- CIIMAR, Terminal de Cruzeiros do Porto de Leixões, Avenida General Norton de Matos, S/N, 4450-208, Matosinhos, Portugal
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19
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Ghosh D, Bhadury P, Routh J. Coping with arsenic stress: Adaptations of arsenite-oxidizing bacterial membrane lipids to increasing arsenic levels. Microbiologyopen 2018; 7:e00594. [PMID: 29577673 PMCID: PMC6182550 DOI: 10.1002/mbo3.594] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Revised: 01/01/2018] [Accepted: 01/05/2018] [Indexed: 11/29/2022] Open
Abstract
Elevated levels of arsenic (As) in aquifers of South East Asia have caused diverse health problems affecting millions of people who drink As-rich groundwater and consume various contaminated agriculture products. The biogeochemical cycling and mobilization/immobilization of As from its mineral-bound phase is controlled by pH, oxic/anoxic conditions, and different microbial processes. The increased As flux generated from ongoing biogeochemical processes in the subsurface in turn affects the in situ microbial communities. This study analyzes how the indigenous arsenite-oxidizing bacteria combat As stress by various biophysical alterations and self-adaptation mechanisms. Fifteen arsenite-oxidizing bacterial strains were isolated and identified using a polyphasic approach. The bacterial strains isolated from these aquifers belong predominantly to arsenite-oxidizing bacterial groups. Of these, the membrane-bound phospholipid fatty acids (PLFA) were characterized in seven selected bacterial isolates grown at different concentrations of As(III) in the medium. One of the significant findings of this study is how the increase in external stress can induce alteration of membrane PLFAs. The change in fatty acid saturation and alteration of their steric conformation suggests alteration of membrane fluidity due to change in As-related stress. However, different bacterial groups can have different degrees of alteration that can affect sustainability in As-rich aquifers of the Bengal Delta Plain.
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Affiliation(s)
- Devanita Ghosh
- Integrative Taxonomy and Microbial Ecology Research GroupDepartment of Biological SciencesIndian Institute of Science Education and Research KolkataMohanpurWest BengalIndia
- Department of Thematic StudiesEnvironmental ChangeLinköping UniversityLinköpingSweden
- Present address:
Laboratory of Biogeochem‐mysteryCentre for Earth SciencesIndian Institute of ScienceBangaloreIndia
| | - Punyasloke Bhadury
- Integrative Taxonomy and Microbial Ecology Research GroupDepartment of Biological SciencesIndian Institute of Science Education and Research KolkataMohanpurWest BengalIndia
| | - Joyanto Routh
- Department of Thematic StudiesEnvironmental ChangeLinköping UniversityLinköpingSweden
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20
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Anomalous behavior of membrane fluidity caused by copper-copper bond coupled phospholipids. Sci Rep 2018; 8:14093. [PMID: 30237448 PMCID: PMC6148289 DOI: 10.1038/s41598-018-32322-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Accepted: 08/17/2018] [Indexed: 11/09/2022] Open
Abstract
Membrane fluidity, essential for cell functions, is obviously affected by copper, but the molecular mechanism is poorly understood. Here, we unexpectedly observed that a decrease in phospholipid (PL) bilayer fluidity caused by Cu2+ was more significant than those by Zn2+ and Ca2+, while a comparable reduction occurred in the last two ions. This finding disagrees with the placement in the periodic table of Cu just next to Zn and far from Ca. The physical nature was revealed to be an anomalous attraction between Cu+ cations, as well as the induced motif of two phospholipids coupled by Cu-Cu bond (PL-diCu-PL). Namely, upon Cu2+ ion binding to a negatively charged phosphate group of lipid, Cu2+ was reduced to Cu+. The attraction of the cations then caused one Cu+ ion simultaneously binding to two lipids and another Cu+, resulting in the formation of PL-diCu-PL structure. In contrast, this attraction cannot occur in the cases of Zn and Ca ions. Remarkably, besides lipids, the phosphate group also widely exists in other biological molecules, including DNA, RNA, ADP and ATP. Our findings thus provide a new view for understanding the biological functions of copper and the mechanism underlying copper-related diseases, as well as lipid assembly.
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21
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Benavides MP, Groppa MD, Recalde L, Verstraeten SV. Effects of polyamines on cadmium- and copper-mediated alterations in wheat (Triticum aestivum L) and sunflower (Helianthus annuus L) seedling membrane fluidity. Arch Biochem Biophys 2018; 654:27-39. [DOI: 10.1016/j.abb.2018.07.008] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Revised: 06/26/2018] [Accepted: 07/09/2018] [Indexed: 02/01/2023]
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22
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Olszowski T, Gutowska I, Baranowska-Bosiacka I, Łukomska A, Drozd A, Chlubek D. Cadmium Alters the Concentration of Fatty Acids in THP-1 Macrophages. Biol Trace Elem Res 2018; 182:29-36. [PMID: 28600650 PMCID: PMC5808062 DOI: 10.1007/s12011-017-1071-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Accepted: 06/05/2017] [Indexed: 12/11/2022]
Abstract
Fatty acid composition of human immune cells influences their function. The aim of this study was to evaluate the effects of known toxicant and immunomodulator, cadmium, at low concentrations on levels of selected fatty acids (FAs) in THP-1 macrophages. The differentiation of THP-1 monocytes into macrophages was achieved by administration of phorbol myristate acetate. Macrophages were incubated with various cadmium chloride (CdCl2) solutions for 48 h at final concentrations of 5 nM, 20 nM, 200 nM, and 2 μM CdCl2. Fatty acids were extracted from samples according to the Folch method. The fatty acid levels were determined using gas chromatography. The following fatty acids were analyzed: long-chain saturated fatty acids (SFAs) palmitic acid and stearic acid, very long-chain saturated fatty acid (VLSFA) arachidic acid, monounsaturated fatty acids (MUFAs) palmitoleic acid, oleic acid and vaccenic acid, and n-6 polyunsaturated fatty acids (PUFAs) linoleic acid and arachidonic acid. Treatment of macrophages with very low concentrations of cadmium (5-200 nM) resulted in significant reduction in the levels of arachidic, palmitoleic, oleic, vaccenic, and linoleic acids and significant increase in arachidonic acid levels (following exposure to 5 nM Cd), without significant reduction of palmitic and stearic acid levels. Treatment of macrophages with the highest tested cadmium concentration (2 μM) produced significant reduction in the levels of all examined FAs: SFAs, VLSFA, MUFAs, and PUFAs. In conclusion, cadmium at tested concentrations caused significant alterations in THP-1 macrophage fatty acid levels, disrupting their composition, which might dysregulate fatty acid/lipid metabolism thus affecting macrophage behavior and inflammatory state.
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Affiliation(s)
- Tomasz Olszowski
- Department of Hygiene and Epidemiology, Pomeranian Medical University, Powstańców Wlkp. 72 Str, 70-111, Szczecin, Poland
| | - Izabela Gutowska
- Department of Biochemistry and Human Nutrition, Pomeranian Medical University, Broniewskiego 24 Str, 71-460, Szczecin, Poland
| | - Irena Baranowska-Bosiacka
- Department of Biochemistry and Medical Chemistry, Pomeranian Medical University, Powstańców Wlkp. 72 Str, 70-111, Szczecin, Poland.
| | - Agnieszka Łukomska
- Department of Biochemistry and Human Nutrition, Pomeranian Medical University, Broniewskiego 24 Str, 71-460, Szczecin, Poland
| | - Arleta Drozd
- Department of Biochemistry and Human Nutrition, Pomeranian Medical University, Broniewskiego 24 Str, 71-460, Szczecin, Poland
| | - Dariusz Chlubek
- Department of Biochemistry and Medical Chemistry, Pomeranian Medical University, Powstańców Wlkp. 72 Str, 70-111, Szczecin, Poland
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23
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Factor effects and mechanisms of the adsorption of Hg(II), Cd(II) and Ni(II) on charged liposomes. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2017.11.036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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24
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Rodriguez-Seijo A, Lourenço J, Rocha-Santos TAP, da Costa J, Duarte AC, Vala H, Pereira R. Histopathological and molecular effects of microplastics in Eisenia andrei Bouché. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2017; 220:495-503. [PMID: 27745914 DOI: 10.1016/j.envpol.2016.09.092] [Citation(s) in RCA: 278] [Impact Index Per Article: 39.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Revised: 09/27/2016] [Accepted: 09/29/2016] [Indexed: 05/18/2023]
Abstract
The ocean has been assumed as the main sink of microplastics (MPs), however, soils may also receive MPs from different sources and through different pathways, which may affect the biota and their role in soil functions. To the best of our knowledge, only one study, until now, reported the effects of MPs on the survival and fitness of soil organisms (Lumbricus terrestris). In our study, epigeic earthworms, of the species E. andrei, were exposed to different concentrations of MPs (0, 62.5, 125, 250, 500 and 1000 mg/kg soildw) in an OECD artificial soil and tested for reproduction, survival and growth of adults, following a standard protocol. The size of the polyethylene MPs to which earthworms were exposed ranged between 250 and 1000 μm. No significant effects were recorded on survival, number of juveniles and, in the final weight of adult earthworms after 28d of exposure, to the different concentrations of MPs. Nevertheless, FTIR-ATR of earthworms and histopathological analysis of the gut provided evidences of damages and immune system responses to MPs.
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Affiliation(s)
- A Rodriguez-Seijo
- Department of Plant Biology and Soil Science, Universidade de Vigo, As Lagoas, Marcosende, 36310 Vigo, Spain
| | - J Lourenço
- Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
| | - T A P Rocha-Santos
- Department of Chemistry & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
| | - J da Costa
- Department of Chemistry & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
| | - A C Duarte
- Department of Chemistry & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
| | - H Vala
- Agrarian School of Viseu, Polytechnic Institute of Viseu. Viseu, Portugal; Centre for the Research and Technology of Agro-Environmental and Biological Sciences (CITAB and Centre for Studies in Education, and Health Technologies (CI&DETS), Portugal
| | - R Pereira
- Department of Biology, Faculty of Sciences of the University of Porto & CIIMAR - Interdisciplinary Centre of Marine and Environmental Research & GreenUP/CITAB-UP, Porto, Portugal.
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25
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The FAME profiles of Cadmium resistant Ochrobactrum sp. and Lead and Arsenate resistant Bacillus spp. NATIONAL ACADEMY SCIENCE LETTERS-INDIA 2015. [DOI: 10.1007/s40009-015-0364-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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26
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Al-Hashimi LM, Gambling L, McArdle HJ. The Effect of Iron Deficiency on Osmotic Sensitivity of Red Blood Cells from Neonatal Rats and Their Mothers. J Membr Biol 2015; 248:1199-206. [PMID: 26439821 DOI: 10.1007/s00232-015-9841-6] [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: 05/29/2015] [Accepted: 09/06/2015] [Indexed: 12/01/2022]
Abstract
Iron deficiency during pregnancy has many effects on both the mother and her developing foetus. These can be both short and long term. One effect is an alteration in fatty acid metabolism and we hypothesised that these changes may result in alterations in membrane function and structure. In order to test this hypothesis, we measured osmotic sensitivity in red blood cells isolated from neonates and their mothers at different times following birth. We fed female rats control or iron-deficient diets for 4 weeks prior to mating and kept them on the same diet until term. At that time, we returned one group of deficient dams to the control diet. The others were kept on the same diet. We showed that iron deficiency results in a decrease in osmotic sensitivity in the mothers but not in their neonates. Returning the dams to the control diet resulted in a return of their red cell osmotic sensitivity to control levels. In the neonates, there was no recovery in haematocrit or in any other parameter, though they did not get any worse, in contrast to the pups being suckled by deficient mothers. The data show two things. The first is that following birth, the mother restores her own iron stores at the expense of the pups, and secondly, there are differences in properties and sensitivities between red cells from mothers and their neonates. This latter observation cannot be explained by differences in the membrane fatty acid profiles, which were not significantly different.
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Affiliation(s)
- L Mossa Al-Hashimi
- Rowett Institute of Nutrition and Health, University of Aberdeen, Greenburn Road, Bucksburn, Aberdeen, AB21 9SB, UK
| | - Lorraine Gambling
- Rowett Institute of Nutrition and Health, University of Aberdeen, Greenburn Road, Bucksburn, Aberdeen, AB21 9SB, UK.
| | - H J McArdle
- Rowett Institute of Nutrition and Health, University of Aberdeen, Greenburn Road, Bucksburn, Aberdeen, AB21 9SB, UK.
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27
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Catalá Á. Lipid peroxidation modifies the assembly of biological membranes "The Lipid Whisker Model". Front Physiol 2015; 5:520. [PMID: 25628570 PMCID: PMC4290515 DOI: 10.3389/fphys.2014.00520] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Accepted: 12/18/2014] [Indexed: 01/05/2023] Open
Affiliation(s)
- Ángel Catalá
- Facultad de Ciencias Exactas, Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas-Centro Científico Tecnológic La Plata-Consejo Nacional de Investigaciones Científicas y Técnicas Universidad Nacional de La Plata, Argentina
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28
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Wnętrzak A, Lipiec E, Łątka K, Kwiatek W, Dynarowicz-Łątka P. Affinity of alkylphosphocholines to biological membrane of prostate cancer: studies in natural and model systems. J Membr Biol 2014; 247:581-9. [PMID: 24848301 PMCID: PMC4052013 DOI: 10.1007/s00232-014-9674-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Accepted: 05/06/2014] [Indexed: 11/28/2022]
Abstract
The effectiveness of two alkylphosphocholines (APCs), hexadecylphosphocholine (miltefosine) and erucylphosphocholine to combat prostate cancer has been studied in vitro with artificial cancerous membrane, modelled with the Langmuir monolayer technique, and on cell line (Du-145). Studies performed with the Langmuir method indicate that both the investigated drugs have the affinity to the monolayer mimicking prostate cancer membrane (composed of cholesterol:POPC = 0.428) and the drug-membrane interactions are stronger for erucylphosphocholine as compared to hexadecylphosphocholine. Moreover, both studied drugs were found to fluidize the model membrane, which may lead to apoptosis. Indeed, biological studies confirmed that in Du-145 cell line both investigated alkylphosphocholines cause cell death primarily by apoptosis while necrotic cells constitute only a small percentage of APC-treated cells.
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Affiliation(s)
- Anita Wnętrzak
- M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059, Kraków, Poland
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29
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Yu Y, Liu X, Gong W, Liu G, Cheng D, Bao H, Gao D. Adsorption of potentially toxic metals on negatively charged liposomes: equilibrium isotherms and quantitative modeling. RSC Adv 2014. [DOI: 10.1039/c4ra04775c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The adsorption data of ten metal ions on liposomes fit Freundlich equilibrium well. Covalent index of metal ions affect significantly the adsorption intensity (n). A quantitative model of KF with metal ionic properties were established by PLS.
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Affiliation(s)
- Yanjun Yu
- College of Chemistry
- Beijing Normal University
- Beijing, People's Republic of China
| | - Xinhui Liu
- State Key Laboratory of Water Environment Simulation
- School of Environment
- Beijing Normal University
- Beijing 100875, People's Republic of China
| | - Wenwen Gong
- State Key Laboratory of Water Environment Simulation
- School of Environment
- Beijing Normal University
- Beijing 100875, People's Republic of China
| | - Guannan Liu
- State Key Laboratory of Water Environment Simulation
- School of Environment
- Beijing Normal University
- Beijing 100875, People's Republic of China
| | - Dengmiao Cheng
- State Key Laboratory of Water Environment Simulation
- School of Environment
- Beijing Normal University
- Beijing 100875, People's Republic of China
| | - Huaying Bao
- College of Chemistry
- Beijing Normal University
- Beijing, People's Republic of China
| | - Ding Gao
- State Key Laboratory of Water Environment Simulation
- School of Environment
- Beijing Normal University
- Beijing 100875, People's Republic of China
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30
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Kristinova V, Mozuraityte R, Aaneby J, Storrø I, Rustad T. Iron-mediated peroxidation in marine emulsions and liposomes studied by dissolved oxygen consumption. EUR J LIPID SCI TECH 2013. [DOI: 10.1002/ejlt.201300301] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Vera Kristinova
- Department of Biotechnology; Norwegian University of Science and Technology (NTNU); Trondheim Norway
- SINTEF Fisheries and Aquaculture Ltd.; Trondheim Norway
| | | | - Jorunn Aaneby
- Department of Biotechnology; Norwegian University of Science and Technology (NTNU); Trondheim Norway
| | - Ivar Storrø
- SINTEF Fisheries and Aquaculture Ltd.; Trondheim Norway
| | - Turid Rustad
- Department of Biotechnology; Norwegian University of Science and Technology (NTNU); Trondheim Norway
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31
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Karaca S, Eraslan G. The effects of flaxseed oil on cadmium-induced oxidative stress in rats. Biol Trace Elem Res 2013; 155:423-30. [PMID: 24043467 DOI: 10.1007/s12011-013-9804-7] [Citation(s) in RCA: 211] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Accepted: 08/23/2013] [Indexed: 10/26/2022]
Abstract
In the present study, the effects of flaxseed oil on the oxidant-antioxidant system in cadmium intoxication were investigated in rats. Forty-eight male Wistar albino rats were divided into four equal groups (group 1). No treatment was applied to the control group. On the other hand, groups 2, 3, and 4 were administered with 0.1 ml/rat/day (∼500 mg/kg bw) flaxseed oil by gavage into the stomach, 50 ppm of cadmium (∼4 mg/kg bw) in ad libitum drinking water, and 0.1 ml/rat/day flaxseed oil plus 50 ppm of cadmium, respectively, for 30 days. At the end of the study, malondialdehyde and nitric oxide levels and catalase, superoxide dismutase, and glutathione peroxidase activities were measured in blood and tissue (liver, lung, kidney, brain, heart, and testes) samples. While malondialdehyde and nitric oxide levels increased in the group given cadmium compared to the control group; in the meantime, there were some significant changes in antioxidant enzyme activities. These changes were observed, the trends of decrease or increase compared to the control group. There were positive changes in parameters of the group given with flaxseed oil plus cadmium compared to the group receiving cadmium alone, in other words, values were seen coming close to control group. As a result, cadmium exposure caused oxidative damage to erythrocytes and organs at varying rates, while flaxseed oil reduced the severity of cadmium-induced lipid peroxidation. Therefore, it was concluded that flaxseed oil can be used among compounds as a therapeutic agent or food additive for prophylaxis in cadmium intoxication.
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Affiliation(s)
- Sedat Karaca
- College of Health Science, Department of Pharmacology and Toxicology, Erciyes University, Kayseri, Turkey
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32
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Shachar-Hill B, Hill AE, Powell J, Skepper JN, Shachar-Hill Y. Mercury-sensitive water channels as possible sensors of water potentials in pollen. JOURNAL OF EXPERIMENTAL BOTANY 2013; 64:5195-205. [PMID: 24098048 PMCID: PMC3830494 DOI: 10.1093/jxb/ert311] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The growing pollen tube is central to plant reproduction and is a long-standing model for cellular tip growth in biology. Rapid osmotically driven growth is maintained under variable conditions, which requires osmosensing and regulation. This study explores the mechanism of water entry and the potential role of osmosensory regulation in maintaining pollen growth. The osmotic permeability of the plasmalemma of Lilium pollen tubes was measured from plasmolysis rates to be 1.32±0.31×10(-3) cm s(-1). Mercuric ions reduce this permeability by 65%. Simulations using an osmotic model of pollen tube growth predict that an osmosensor at the cell membrane controls pectin deposition at the cell tip; inhibiting the sensor is predicted to cause tip bursting due to cell wall thinning. It was found that adding mercury to growing pollen tubes caused such a bursting of the tips. The model indicates that lowering the osmotic permeability per se does not lead to bursting but rather to thickening of the tip. The time course of induced bursting showed no time lag and was independent of mercury concentration, compatible with a surface site of action. The submaximal bursting response to intermediate mercuric ion concentration was independent of the concentration of calcium ions, showing that bursting is not due to a competitive inhibition of calcium binding or entry. Bursting with the same time course was also shown by cells growing on potassium-free media, indicating that potassium channels (implicated in mechanosensing) are not involved in the bursting response. The possible involvement of mercury-sensitive water channels as osmosensors and current knowledge of these in pollen cells are discussed.
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Affiliation(s)
| | - Adrian E. Hill
- Department of Physiology, Development and Neuroscience, Cambridge University, Cambridge, UK
- * To whom correspondence should be addressed. E-mail:
| | - Janet Powell
- Multi-Imaging Centre, Cambridge University, Cambridge, UK
| | | | - Yair Shachar-Hill
- Department of Plant Biology, Plant Biology Building, Michigan State University, East Lansing, MI 48824-1312, USA
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33
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Reaction of Hg2+ Insertion into Cysteine Pairs Within Bovine Insulin Crystals Followed via Raman Spectroscopy. J SOLUTION CHEM 2013. [DOI: 10.1007/s10953-013-0066-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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34
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Tekpli X, Holme JA, Sergent O, Lagadic-Gossmann D. Role for membrane remodeling in cell death: Implication for health and disease. Toxicology 2013; 304:141-57. [DOI: 10.1016/j.tox.2012.12.014] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Revised: 11/29/2012] [Accepted: 12/20/2012] [Indexed: 12/31/2022]
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35
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de Arvelos LR, Rocha VCA, Felix GP, da Cunha CC, Bernardino Neto M, da Silva Garrote Filho M, de Fátima Pinheiro C, Resende ES, Penha-Silva N. Bivariate and multivariate analyses of the influence of blood variables of patients submitted to Roux-en-Y gastric bypass on the stability of erythrocyte membrane against the chaotropic action of ethanol. J Membr Biol 2013; 246:231-42. [PMID: 23344659 DOI: 10.1007/s00232-013-9524-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Accepted: 01/01/2013] [Indexed: 11/26/2022]
Abstract
The stability of the erythrocyte membrane, which is essential for the maintenance of cell functions, occurs in a critical region of fluidity, which depends largely on its composition and the composition and characteristics of the medium. As the composition of the erythrocyte membrane is influenced by several blood variables, the stability of the erythrocyte membrane must have relations with them. The present study aimed to evaluate, by bivariate and multivariate statistical analyses, the correlations and causal relationships between hematologic and biochemical variables and the stability of the erythrocyte membrane against the chaotropic action of ethanol. The validity of this type of analysis depends on the homogeneity of the population and on the variability of the studied parameters, conditions that can be filled by patients who undergo bariatric surgery by the technique of Roux-en-Y gastric bypass since they will suffer feeding restrictions that have great impact on their blood composition. Pathway analysis revealed that an increase in hemoglobin leads to decreased stability of the cell, probably through a process mediated by an increase in mean corpuscular volume. Furthermore, an increase in the mean corpuscular hemoglobin (MCH) leads to an increase in erythrocyte membrane stability, probably because higher values of MCH are associated with smaller quantities of red blood cells and a larger contact area between the cell membrane and ethanol present in the medium.
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Affiliation(s)
- Leticia Ramos de Arvelos
- Instituto de Genética e Bioquímica, Universidade Federal de Uberlândia, Av. Pará, 1720, Uberlândia, MG 38400-902, Brazil
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36
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Zhao GY, Zhao LP, He YF, Li GF, Gao C, Li K, Xu YJ. A comparison of the biological activities of human osteoblast hFOB1.19 between iron excess and iron deficiency. Biol Trace Elem Res 2012; 150:487-95. [PMID: 23054865 DOI: 10.1007/s12011-012-9511-9] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2012] [Accepted: 09/21/2012] [Indexed: 01/20/2023]
Abstract
Bone metabolism has a close relationship with iron homeostasis. To examine the effects of iron excess and iron deficiency on the biological activities of osteoblast in vitro, human osteoblast cells (hFOB1.19) were incubated in a medium supplemented with 0-200 μmol/L ferric ammonium citrate and 0-20 μmol/L deferoxamine. The intracellular iron was measured by a confocal laser scanning microscope. Proliferation of osteoblasts was evaluated by 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide assay. Apoptotic cells were detected using annexin intervention V/PI staining with a flow cytometry. Alkaline phosphatase (ALP) activity was measured using an ALP assay kit. The number of calcified nodules and mineral area was evaluated by von Kossa staining assay. The expressions of type I collagen and osteocalcin of cultured osteoblasts were detected by reverse transcriptase polymerase chain reaction and Western blot. Intracellular reactive oxygen species (ROS) was measured using the oxidation-sensitive dye 2,7-dichlorofluorescin diacetate by flow cytometry. The results indicated that excessive iron inhibited osteoblast activity in a concentration-dependent manner. Low iron concentrations, in contrast, produced a biphasic manner on osteoblasts: mild low iron promoted osteoblast activity, but serious low iron inhibited osteoblast activity. Osteogenesis was optimal in certain iron concentrations. The mechanism underlying biological activity invoked by excessive iron may be attributed to increased intracellular ROS levels.
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Affiliation(s)
- Guo-Yang Zhao
- Department of Orthopaedics, The Second Affiliated Hospital of Soochow University, Suzhou, 215004, China
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37
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Ewe JA, Wan Abdullah WN, Bhat R, Karim AA, Liong MT. Enhanced growth of lactobacilli and bioconversion of isoflavones in biotin-supplemented soymilk upon ultrasound-treatment. ULTRASONICS SONOCHEMISTRY 2012; 19:160-173. [PMID: 21775184 DOI: 10.1016/j.ultsonch.2011.06.013] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2011] [Revised: 06/07/2011] [Accepted: 06/21/2011] [Indexed: 05/28/2023]
Abstract
This study aimed at utilizing ultrasound treatment to further enhance the growth of lactobacilli and their isoflavone bioconversion activities in biotin-supplemented soymilk. Strains of lactobacilli (Lactobacillus acidophilus BT 1088, L. fermentum BT 8219, L. acidophilus FTDC 8633, L. gasseri FTDC 8131) were treated with ultrasound (30 kHz, 100 W) at different amplitudes (20%, 60% and 100%) for 60, 120 and 180 s prior to inoculation and fermentation in biotin-soymilk. The treatment affected the fatty acids chain of the cellular membrane lipid bilayer, as shown by an increased lipid peroxidation (P<0.05). This led to increased membrane fluidity and subsequently, membrane permeability (P<0.05). The permeabilized cellular membranes had facilitated nutrient internalization and subsequent growth enhancement (P<0.05). Higher amplitudes and longer durations of the treatment promoted growth of lactobacilli in soymilk, with viable counts exceeding 9 log CFU/mL. The intracellular and extracellular β-glucosidase specific activities of lactobacilli were also enhanced (P<0.05) upon ultrasound treatment, leading to increased bioconversion of isoflavones in soymilk, particularly genistin and malonyl genistin to genistein. Results from this study show that ultrasound treatment on lactobacilli cells promotes (P<0.05) the β-glucosidase activity of cells for the benefit of enhanced (P<0.05) isoflavone glucosides bioconversion to bioactive aglycones in soymilk.
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Affiliation(s)
- Joo-Ann Ewe
- Food Technology Division, School of Industrial Technology, Universiti Sains Malaysia, 11800 Penang, Malaysia
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38
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Ewe JA, Wan-Abdullah WN, Alias AK, Liong MT. Enhanced growth of lactobacilli and bioconversion of isoflavones in biotin-supplemented soymilk by electroporation. Int J Food Sci Nutr 2011; 63:580-96. [DOI: 10.3109/09637486.2011.641940] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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39
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Waranusantigul P, Lee H, Kruatrachue M, Pokethitiyook P, Auesukaree C. Isolation and characterization of lead-tolerant Ochrobactrum intermedium and its role in enhancing lead accumulation by Eucalyptus camaldulensis. CHEMOSPHERE 2011; 85:584-590. [PMID: 21764101 DOI: 10.1016/j.chemosphere.2011.06.086] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2011] [Revised: 06/21/2011] [Accepted: 06/21/2011] [Indexed: 05/31/2023]
Abstract
In this study, the potential of rhizospheric bacteria in promoting the growth and Pb accumulation by the woody plant Eucalyptus camaldulensis under hydroponic conditions was investigated for the first time. Three Pb-tolerant bacteria were isolated from the rhizosphere of E. camaldulensis grown in Pb-contaminated soils in the Bo Ngam Pb mine, Thailand. Based on analysis of partial 16S rRNA gene sequence, the three isolates were identified as Microbacterium paraoxydans BN-2, Ochrobactrum intermedium BN-3, and Bacillus fusiformis BN-4. Among these strains, O. intermedium BN-3 showed the highest tolerance to not only Pb but also Cd and Zn. After growth in the presence of Pb, the membranes of O. intermedium BN-3 cells exhibited an increase in unsaturated fatty acid levels but a decrease in fluidity. In hydroponic studies, inoculation of O. intermedium BN-3 significantly increased the biomass and Pb accumulation by E. camaldulensis compared to the uninoculated control. The results suggested the role of the natural rhizospheric bacteria localized to the root surface of E. camaldulensis in promoting Pb accumulation and plant growth. Our results indicate that O. intermedium BN-3 and other indigenous rhizospheric bacteria have the potential to improve the efficiency of phytoremediation of Pb-contaminated sites.
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40
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Debiane D, Calonne M, Fontaine J, Laruelle F, Grandmougin-Ferjani A, Lounes-Hadj Sahraoui A. Lipid content disturbance in the arbuscular mycorrhizal, Glomus irregulare grown in monoxenic conditions under PAHs pollution. Fungal Biol 2011; 115:782-92. [DOI: 10.1016/j.funbio.2011.06.003] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2011] [Revised: 05/13/2011] [Accepted: 06/07/2011] [Indexed: 11/27/2022]
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41
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Moncayo R. Reflections on the theory of "silver bullet" octreotide tracers: implications for ligand-receptor interactions in the age of peptides, heterodimers, receptor mosaics, truncated receptors, and multifractal analysis. EJNMMI Res 2011; 1:9. [PMID: 22214590 PMCID: PMC3251005 DOI: 10.1186/2191-219x-1-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2011] [Accepted: 07/26/2011] [Indexed: 12/25/2022] Open
Abstract
The classical attitude of Nuclear Medicine practitioners on matters of peptide-receptor interactions has maintained an intrinsic monogamic character since many years. New advances in the field of biochemistry and even in clinical Nuclear Medicine have challenged this type of thinking, which prompted me to work on this review. The central issue of this paper will be the use of somatostatin analogs, i.e., octreotide, in clinical imaging procedures as well as in relation to neuroendocirne tumors. Newly described characteristics of G-protein coupled receptors such as the formation of receptor mosaics will be discussed. A small section will enumerate the regulatory processes found in the cell membrane. Possible new interpretations, other than tumor detection, based on imaging procedures with somatostatin analogs will be presented. The readers will be taken to situations such as inflammation, nociception, mechanosensing, chemosensing, fibrosis, taste, and vascularity where somatostatin is involved. Thyroid-associated orbitopathy will be used as a model for the development of multi-agent therapeutics. The final graphical summary depicts the multifactorial properties of ligand binding.
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Affiliation(s)
- Roy Moncayo
- Department of Nuclear Medicine, Medical University of Innsbruck, Innsbruck, Austria.
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42
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Wysocki R, Tamás MJ. How Saccharomyces cerevisiae copes with toxic metals and metalloids. FEMS Microbiol Rev 2011; 34:925-51. [PMID: 20374295 DOI: 10.1111/j.1574-6976.2010.00217.x] [Citation(s) in RCA: 206] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Toxic metals and metalloids are widespread in nature and can locally reach fairly high concentrations. To ensure cellular protection and survival in such environments, all organisms possess systems to evade toxicity and acquire tolerance. This review provides an overview of the molecular mechanisms that contribute to metal toxicity, detoxification and tolerance acquisition in budding yeast Saccharomyces cerevisiae. We mainly focus on the metals/metalloids arsenic, cadmium, antimony, mercury, chromium and selenium, and emphasize recent findings on sensing and signalling mechanisms and on the regulation of tolerance and detoxification systems that safeguard cellular and genetic integrity.
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Affiliation(s)
- Robert Wysocki
- Institute of Genetics and Microbiology, University of Wroclaw, Wroclaw, Poland
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43
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Fuentes-Broto L, Miana-Mena FJ, Piedrafita E, Berzosa C, Martínez-Ballarín E, García-Gil FA, Reiter RJ, García JJ. Melatonin protects against taurolithocholic-induced oxidative stress in rat liver. J Cell Biochem 2010; 110:1219-25. [PMID: 20564217 DOI: 10.1002/jcb.22636] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Cholestasis, encountered in a variety of clinical disorders, is characterized by intracellular accumulation of toxic bile acids in the liver. Furthermore, oxidative stress plays an important role in the pathogenesis of bile acids. Taurolithocholic acid (TLC) was revealed in previous studies as the most pro-oxidative bile acid. Melatonin, a well-known antioxidant, is a safe and widely used therapeutic agent. Herein, we investigated the hepatoprotective role of melatonin on lipid and protein oxidation induced by TLC alone and in combination with FeCl(3) and ascorbic acid in rat liver homogenates and hepatic membranes. The lipid peroxidation products, malondialdehyde and 4-hydroxyalkenals (MDA + 4-HDA), and carbonyl levels were quantified as indices of oxidative damage to hepatic lipids and proteins, respectively. In the current study, the rise in MDA + 4-HDA levels induced by TLC was inhibited by melatonin in a concentration-dependent manner in both liver homogenates and in hepatic membranes. Melatonin also had protective effects against structural damage to proteins induced by TLC in membranes. These results suggest that the indoleamine melatonin may potentially act as a protective agent in the therapy of those diseases that involve bile acid toxicity.
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Affiliation(s)
- Lorena Fuentes-Broto
- Department of Pharmacology and Physiology, Universidad de Zaragoza, Zaragoza, Spain
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44
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Zinc - effect on the spring barleyʼs plant and roots growth, grain technological quality, and yeast fermentation. KVASNY PRUMYSL 2010. [DOI: 10.18832/kp2010021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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45
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Paraszkiewicz K, Bernat P, Naliwajski M, Długoński J. Lipid peroxidation in the fungus Curvularia lunata exposed to nickel. Arch Microbiol 2010; 192:135-41. [DOI: 10.1007/s00203-009-0542-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2008] [Revised: 12/18/2009] [Accepted: 12/27/2009] [Indexed: 12/31/2022]
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46
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Greiner AJ, Pillman HA, Worden RM, Blanchard GJ, Ofoli RY. Effect of hydrogen bonding on the rotational and translational dynamics of a headgroup-bound chromophore in bilayer lipid membranes. J Phys Chem B 2009; 113:13263-8. [PMID: 19761197 DOI: 10.1021/jp9057862] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We have studied the interactions of the chromophore 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine-N-7-nitro-2-1,3-benzoxadiazol-4-yl (18:1 NBD-PE) imbedded in the headgroup region of bilayer lipid membranes consisting of 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) and 1,2-dioleoyl-sn-glycero-3-[phospho-rac-(1-glycerol)] (DOPG). We have examined the molecular and mesoscale dynamics of the chromophore using time-correlated single photon counting (TCSPC) to measure rotational diffusion dynamics in lipid vesicles and fluorescence recovery after pattern photobleaching (FRAPP) to determine translational diffusion coefficients and mobile fractions in supported lipid bilayers. TCSPC data reveal that chromophore rotational diffusion rates in DOPG vesicles are statistically the same as in DOPC and mixed DOPC/DOPG vesicles, suggesting that the NBD-PE chromophore does not interact strongly with the headgroup region of these bilayers; however, FRAPP experiments show that lateral diffusion is statistically lower in mixed DOPC/DOPG-supported bilayers than in DOPC-supported bilayers. These results suggest that bilayers containing DOPG likely undergo interlipid headgroup hydrogen bonding interactions that suppress translational diffusion.
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Affiliation(s)
- Aaron J Greiner
- Department of Chemical Engineering and Materials Science and Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
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Thorsen M, Perrone GG, Kristiansson E, Traini M, Ye T, Dawes IW, Nerman O, Tamás MJ. Genetic basis of arsenite and cadmium tolerance in Saccharomyces cerevisiae. BMC Genomics 2009; 10:105. [PMID: 19284616 PMCID: PMC2660369 DOI: 10.1186/1471-2164-10-105] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2008] [Accepted: 03/12/2009] [Indexed: 11/10/2022] Open
Abstract
Background Arsenic and cadmium are widely distributed in nature and pose serious threats to the environment and human health. Exposure to these nonessential toxic metals may result in a variety of human diseases including cancer. However, arsenic and cadmium toxicity targets and the cellular systems contributing to tolerance acquisition are not fully known. Results To gain insight into metal action and cellular tolerance mechanisms, we carried out genome-wide screening of the Saccharomyces cerevisiae haploid and homozygous diploid deletion mutant collections and scored for reduced growth in the presence of arsenite or cadmium. Processes found to be required for tolerance to both metals included sulphur and glutathione biosynthesis, environmental sensing, mRNA synthesis and transcription, and vacuolar/endosomal transport and sorting. We also identified metal-specific defence processes. Arsenite-specific defence functions were related to cell cycle regulation, lipid and fatty acid metabolism, mitochondrial biogenesis, and the cytoskeleton whereas cadmium-specific defence functions were mainly related to sugar/carbohydrate metabolism, and metal-ion homeostasis and transport. Molecular evidence indicated that the cytoskeleton is targeted by arsenite and that phosphorylation of the Snf1p kinase is required for cadmium tolerance. Conclusion This study has pin-pointed core functions that protect cells from arsenite and cadmium toxicity. It also emphasizes the existence of both common and specific defence systems. Since many of the yeast genes that confer tolerance to these agents have homologues in humans, similar biological processes may act in yeast and humans to prevent metal toxicity and carcinogenesis.
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Affiliation(s)
- Michael Thorsen
- Department of Cell and Molecular Biology/Microbiology, University of Gothenburg, S-405 30 Gothenburg, Sweden.
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Broniatowski M, Dynarowicz-Łatka P. Search for the Molecular Mechanism of Mercury Toxicity. Study of the Mercury(II)−Surfactant Complex Formation in Langmuir Monolayers. J Phys Chem B 2009; 113:4275-83. [DOI: 10.1021/jp810339e] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marcin Broniatowski
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland
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Zwolak I, Zaporowska H. Preliminary studies on the effect of zinc and selenium on vanadium-induced cytotoxicity in vitro. ACTA BIOLOGICA HUNGARICA 2009; 60:55-67. [PMID: 19378924 DOI: 10.1556/abiol.60.2009.1.6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
In the present work, we investigated the cytotoxicity of vanadium and the influence of zinc and selenium on vanadium-dependent cell damage in the BALB/c 3T3 cell culture. Treatment of cells for 24 hours with medium containing 50, 100 and 200 microM NaVO3 caused a significant decrease in the cell viability as measured by MTT test. Furthermore, the assays for reactive oxygen species (NBT reduction and phenol red oxidation) demonstrated the increase in superoxide and hydrogen peroxide production. In the cotreatment studies, the cells were exposed to NaVO3 (50, 100 and 200 microM) in the presence of nontoxic concentrations of ZnCl2 (5 microM) or Na2SeO3 (0.5 microM). Following 24 h incubation, the cell viability (assessed in MTT assay) and reactive oxygen species generation were evaluated. Our data suggest that zinc and selenium, in the concentrations mentioned above, provide no protection against adverse actions induced by sodium metavanadate at concentration levels of 50, 100 and 200 microM. To our knowledge, this is the first report from in vitro studies on interaction between pentavalent vanadium and trace elements that function as antioxidants: zinc and selenium.
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Affiliation(s)
- Iwona Zwolak
- Department of Cell Biology, Institute of Environmental Protection, John Paul II Catholic University of Lublin, Lublin, Poland.
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