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Navratilova P, Vejvodova M, Vaculovic T, Slaninova I, Emmer J, Tomas T, Ryba L, Burda J, Pavkova Goldbergova M. Cytotoxic effects and comparative analysis of Ni ion uptake by osteoarthritic and physiological osteoblasts. Sci Rep 2024; 14:16133. [PMID: 38997414 PMCID: PMC11245524 DOI: 10.1038/s41598-024-67157-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2024] [Accepted: 07/08/2024] [Indexed: 07/14/2024] Open
Abstract
Nickel(Ni)-containing materials have been widely used in a wide range of medical applications, including orthopaedics. Despite their excellent properties, there is still a problem with the release of nickel ions into the patient's body, which can cause changes in the behaviour of surrounding cells and tissues. This study aims to evaluate the effects of Ni on bone cells with an emphasis on the determination of Ni localization in cellular compartments in time. For these purposes, one of the most suitable models for studying the effects induced by metal implants was used-the patient's osteoarthritic cells. Thanks to this it was possible to simulate the pathophysiological conditions in the patient's body, as well as to evaluate the response of the cells which come into direct contact with the material after the implantation of the joint replacement. The largest differences in cell viability, proliferation and cell cycle changes occurred between Ni 0.5 mM and 1 mM concentrations. Time-dependent localization of Ni in cells showed that there is a continuous transport of Ni ions between the nucleus and the cytoplasm, as well as between the cell and the environment. Moreover, osteoarthritic osteoblasts showed faster changes in concentration and ability to accumulate more Ni, especially in the nucleus, than physiological osteoblasts. The differences in Ni accumulation process explains the higher sensitivity of patient osteoblasts to Ni and may be crucial in further studies of implant-derived cytotoxic effects.
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Affiliation(s)
- Polina Navratilova
- Department of Pathophysiology, Faculty of Medicine, Masaryk University, Kamenice 5, Brno, Czech Republic
| | - Marketa Vejvodova
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, Brno, Czech Republic
| | - Tomas Vaculovic
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, Brno, Czech Republic.
| | - Iva Slaninova
- Department of Biology, Faculty of Medicine, Masaryk University, Kamenice 5, Building A6, 62500, Brno, Czech Republic
| | - Jan Emmer
- 1st Department of Orthopaedics, St. Anne`S University Hospital, Pekarska 53, Brno, Czech Republic
| | - Tomas Tomas
- 1st Department of Orthopaedics, St. Anne`S University Hospital, Pekarska 53, Brno, Czech Republic
| | - Ludek Ryba
- Department of Orthopaedic Surgery, University Hospital, Jihlavska 20, Brno, Czech Republic
| | - Jan Burda
- Department of Orthopaedic Surgery, University Hospital, Jihlavska 20, Brno, Czech Republic
| | - Monika Pavkova Goldbergova
- Department of Pathophysiology, Faculty of Medicine, Masaryk University, Kamenice 5, Brno, Czech Republic.
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2
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Schmalz G, Arenholt-Bindslev D, Pfüller S, Schweikl H. Cytotoxicity of Metal Cations used in Dental Cast Alloys. Altern Lab Anim 2020. [DOI: 10.1177/026119299702500313] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The toxicity of dental alloys depends upon the quantity and chemical state of metal elements released from the alloy into the affected tissue. The purpose of the present study was to investigate the effects of various cell lines, various cell numbers, and various serum concentrations on the cytotoxicity of metal cations which are components of dental alloys. Aqueous salt solutions were tested on two continuous cell lines (L-929 mouse fibroblast-like cells and HaK hamster epithelial-like kidney cells) and on primary human gingival fibroblasts. The cell culture medium was routinely supplemented with 5% fetal calf serum. The influence of the serum concentration on the cytotoxic potencies of metal cations was investigated by increasing the concentration to 20% in one series of experiments with L-929 cells. Cell reactions were recorded with the MTT test after exposure for 24 hours. The rank order of the cytotoxicity of cations in L-929 cells (10,000 cells/well, 5% serum) from the most to the least toxic was: Ag+, Zn2+, Cd2+, Hg2+, Au3+, Pt4+, Co2+, Cu2+, Ni2+, Pd2+, Mn2+, Nb5+, Mo5+, Ga3+, Cr3+, In3+, Sn2+. A variation in cell number between 5000 and 10,000 cells/well did not influence the results. Furthermore, no differences were observed in the cytotoxic responses of the two continuous cell lines. Variation in the serum content of L-929 cell culture medium had no significant influence on the cytotoxicity of most metal cations, except for Nb5+, Ni2+, Sn2+. Primary human gingival fibroblasts showed the same rank order of toxicity as the continuous cell lines, but at higher concentrations of the test materials.
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Affiliation(s)
- Gottfried Schmalz
- Department of Operative Dentistry and Periodontology, University of Regensburg, 93042 Regensburg, Germany
| | - Dorthe Arenholt-Bindslev
- Department of Dental Pathology, Operative Dentistry and Endodontics, Royal Dental College, Faculty of Health Sciences, University of Aarhus, Vennelyst Boulevard 9, 8000 Aarhus C, Denmark
| | - Silke Pfüller
- Department of Operative Dentistry and Periodontology, University of Regensburg, 93042 Regensburg, Germany
| | - Helmut Schweikl
- Department of Operative Dentistry and Periodontology, University of Regensburg, 93042 Regensburg, Germany
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Madea D, Martínek M, Muchová L, Váňa J, Vítek L, Klán P. Structural Modifications of Nile Red Carbon Monoxide Fluorescent Probe: Sensing Mechanism and Applications. J Org Chem 2020; 85:3473-3489. [DOI: 10.1021/acs.joc.9b03217] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Dominik Madea
- Department of Chemistry and RECETOX, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Marek Martínek
- Department of Chemistry and RECETOX, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Lucie Muchová
- Institute of Medical Biochemistry and Laboratory Diagnostics, 1st Faculty of Medicine, Charles University, Na Bojišti 3, 121 08 Praha 2, Czech Republic
| | - Jiří Váňa
- Institute of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10 Pardubice, Czech Republic
| | - Libor Vítek
- Institute of Medical Biochemistry and Laboratory Diagnostics, 1st Faculty of Medicine, Charles University, Na Bojišti 3, 121 08 Praha 2, Czech Republic
| | - Petr Klán
- Department of Chemistry and RECETOX, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
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Ganguly P, Breen A, Pillai SC. Toxicity of Nanomaterials: Exposure, Pathways, Assessment, and Recent Advances. ACS Biomater Sci Eng 2018; 4:2237-2275. [DOI: 10.1021/acsbiomaterials.8b00068] [Citation(s) in RCA: 154] [Impact Index Per Article: 25.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Priyanka Ganguly
- Nanotechnology and Bio-Engineering Research Group, Department of Environmental Science, School of Science, Institute of Technology Sligo, Ash Lane, Sligo F91 YW50, Ireland
- Centre for Precision Engineering, Materials and Manufacturing Research (PEM), Institute of Technology Sligo, Ash Lane, Sligo F91 YW50, Ireland
| | - Ailish Breen
- Nanotechnology and Bio-Engineering Research Group, Department of Environmental Science, School of Science, Institute of Technology Sligo, Ash Lane, Sligo F91 YW50, Ireland
- Centre for Precision Engineering, Materials and Manufacturing Research (PEM), Institute of Technology Sligo, Ash Lane, Sligo F91 YW50, Ireland
| | - Suresh C. Pillai
- Nanotechnology and Bio-Engineering Research Group, Department of Environmental Science, School of Science, Institute of Technology Sligo, Ash Lane, Sligo F91 YW50, Ireland
- Centre for Precision Engineering, Materials and Manufacturing Research (PEM), Institute of Technology Sligo, Ash Lane, Sligo F91 YW50, Ireland
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5
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Indium(III) complexes with 2-acetylpyridine-derived thiosemicarbazones exhibit cytotoxic activity against human leukemia and solid tumor cell lines. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.06.045] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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6
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A novel high-strength and highly corrosive biodegradable Fe-Pd alloy: Structural, mechanical and in vitro corrosion and cytotoxicity study. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017. [DOI: 10.1016/j.msec.2017.05.100] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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7
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Silver sulfadiazine immobilized glass as antimicrobial fillers for dental restorative materials. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 75:524-534. [DOI: 10.1016/j.msec.2017.02.069] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Revised: 11/29/2016] [Accepted: 02/14/2017] [Indexed: 11/24/2022]
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8
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Biocompatibility of NiTi alloys in the cell behaviour. Biometals 2017; 30:163-169. [DOI: 10.1007/s10534-017-0002-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 02/09/2017] [Indexed: 12/20/2022]
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9
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Wataha JC, Lewis JB, Lockwood PE, Hsu S, Messer RL, Rueggeberg FA, Bouillaguet S. Blue Light Differentially Modulates Cell Survival and Growth. J Dent Res 2016; 83:104-8. [PMID: 14742645 DOI: 10.1177/154405910408300204] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Previous studies have reported that blue light (400–500 nm) inhibits cell mitochondrial activity. We investigated the hypothesis that cells with high energy consumption are most susceptible to blue-light-induced mitochondrial inhibition. We estimated cell energy consumption by population doubling time, and cell survival and growth by succinate dehydrogenase (SDH) activity. Six cell types were exposed to 5 or 60 J/cm2 of blue light from quartz-tungsten-halogen (QTH), plasma-arc (PAC), or argon laser sources in monolayer culture. Post-light SDH activity correlated positively with population doubling time (R2 = 0.91 for PAC, 0.76 for QTH, 0.68 for laser); SDH activity increased for cell types with the longest doubling times and was suppressed for cell types with shorter doubling times. Thus, light-induced exposure differentially affects SDH activity, cell survival, and growth, depending on cell energy consumption. Blue light may be useful as a therapeutic modulator of cell growth and survival.
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Affiliation(s)
- J C Wataha
- Department of Oral Rehabilitation, Medical College of Georgia School of Dentistry, Augusta, GA 30912-1260, USA.
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Kurtjak M, Vukomanović M, Kramer L, Suvorov D. Biocompatible nano-gallium/hydroxyapatite nanocomposite with antimicrobial activity. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2016; 27:170. [PMID: 27704374 DOI: 10.1007/s10856-016-5777-3] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2016] [Accepted: 09/02/2016] [Indexed: 06/06/2023]
Abstract
Intensive research in the area of medical nanotechnology, especially to cope with the bacterial resistance against conventional antibiotics, has shown strong antimicrobial action of metallic and metal-oxide nanomaterials towards a wide variety of bacteria. However, the important remaining problem is that nanomaterials with highest antibacterial activity generally express also a high level of cytotoxicity for mammalian cells. Here we present gallium nanoparticles as a new solution to this problem. We developed a nanocomposite from bioactive hydroxyapatite nanorods (84 wt %) and antibacterial nanospheres of elemental gallium (16 wt %) with mode diameter of 22 ± 11 nm. In direct comparison, such nanocomposite with gallium nanoparticles exhibited better antibacterial properties against Pseudomonas aeruginosa and lower in-vitro cytotoxicity for human lung fibroblasts IMR-90 and mouse fibroblasts L929 (efficient antibacterial action and low toxicity from 0.1 to 1 g/L) than the nanocomposite of hydroxyapatite and silver nanoparticles (efficient antibacterial action and low toxicity from 0.2 to 0.25 g/L). This is the first report of a biomaterial composite with gallium nanoparticles. The observed strong antibacterial properties and low cytotoxicity make the investigated material promising for the prevention of implantation-induced infections that are frequently caused by P. aeruginosa.
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Affiliation(s)
- Mario Kurtjak
- Jožef Stefan Institute, Advanced Materials Department, Jamova cesta 39, Ljubljana, 1000, Slovenia.
- Jozef Stefan International Postgraduate School, Jamova cesta 39, Ljubljana, 1000, Slovenia.
| | - Marija Vukomanović
- Jožef Stefan Institute, Advanced Materials Department, Jamova cesta 39, Ljubljana, 1000, Slovenia
| | - Lovro Kramer
- Jozef Stefan International Postgraduate School, Jamova cesta 39, Ljubljana, 1000, Slovenia
- Jožef Stefan Institute, Department of Biochemistry and Molecular Biology, Jamova cesta 39, Ljubljana, 1000, Slovenia
| | - Danilo Suvorov
- Jožef Stefan Institute, Advanced Materials Department, Jamova cesta 39, Ljubljana, 1000, Slovenia
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11
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Lin Y, Xiao W, Bal BS, Rahaman MN. Effect of copper-doped silicate 13–93 bioactive glass scaffolds on the response of MC3T3-E1 cells in vitro and on bone regeneration and angiogenesis in rat calvarial defects in vivo. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 67:440-452. [DOI: 10.1016/j.msec.2016.05.073] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Revised: 04/15/2016] [Accepted: 05/16/2016] [Indexed: 12/30/2022]
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12
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Lobo ACS, Silva AD, Tomé VA, Pinto SMA, Silva EFF, Calvete MJF, Gomes CMF, Pereira MM, Arnaut LG. Phthalocyanine Labels for Near-Infrared Fluorescence Imaging of Solid Tumors. J Med Chem 2016; 59:4688-96. [DOI: 10.1021/acs.jmedchem.6b00054] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Ana C. S. Lobo
- CQC, Chemistry Department, University of Coimbra, 3004 - 535 Coimbra, Portugal
| | - Alexandre D. Silva
- CQC, Chemistry Department, University of Coimbra, 3004 - 535 Coimbra, Portugal
| | - Vanessa A. Tomé
- CQC, Chemistry Department, University of Coimbra, 3004 - 535 Coimbra, Portugal
| | - Sara M. A. Pinto
- CQC, Chemistry Department, University of Coimbra, 3004 - 535 Coimbra, Portugal
| | - Elsa F. F. Silva
- CQC, Chemistry Department, University of Coimbra, 3004 - 535 Coimbra, Portugal
| | - Mário J. F. Calvete
- CQC, Chemistry Department, University of Coimbra, 3004 - 535 Coimbra, Portugal
| | - Célia M. F. Gomes
- Laboratory
of Pharmacology and Experimental Therapeutics, IBILI, Faculty of Medicine, University of Coimbra, 3000-548 Coimbra, Portugal
| | - Mariette M. Pereira
- CQC, Chemistry Department, University of Coimbra, 3004 - 535 Coimbra, Portugal
| | - Luis G. Arnaut
- CQC, Chemistry Department, University of Coimbra, 3004 - 535 Coimbra, Portugal
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13
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Nierlich J, Papageorgiou SN, Bourauel C, Hültenschmidt R, Bayer S, Stark H, Keilig L. Corrosion behavior of dental alloys used for retention elements in prosthodontics. Eur J Oral Sci 2016; 124:287-94. [PMID: 27061513 DOI: 10.1111/eos.12267] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/12/2016] [Indexed: 11/29/2022]
Abstract
The purpose of this study was to investigate the corrosion behavior of 10 different high noble gold-based dental alloys, used for prosthodontic retention elements, according to ISO 10271. Samples of 10 high-noble and noble gold-based dental alloys were subjected to: (i) static immersion tests with subsequent analysis of ion release for eight different elements using mass spectrometry; (ii) electrochemical tests, including open-circuit potential and potentiodynamic scans; and (iii) scanning electron microscopy, followed by energy-dispersive X-ray microscopy. The results were analyzed using one-way ANOVA and Sidak multiple-comparisons post-hoc test at a level of significance of α = 0.05. Significant differences were found among the 10 alloys studied for all ions (P < 0.001). The potentiodynamic analysis showed values from -82.5 to 102.8 mV for the open-circuit potential and from 566.7 to 1367.5 mV for the breakdown potential. Both the open-circuit and the breakdown potential varied considerably among these alloys. Scanning electron microscopy analysis confirmed the existence of typically small-diameter corrosion defects, whilst the energy-dispersive X-ray analysis found no significant alteration in the elemental composition of the alloys. The results of this study reveal the variability in the corrosive resistance among the materials used for retention elements in prosthodontics.
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Affiliation(s)
- Judith Nierlich
- Department of Oral Technology, School of Dentistry, University of Bonn, Bonn, Germany
| | - Spyridon N Papageorgiou
- Department of Oral Technology, School of Dentistry, University of Bonn, Bonn, Germany.,Department of Orthodontics, School of Dentistry, University of Bonn, Bonn, Germany
| | - Christoph Bourauel
- Department of Oral Technology, School of Dentistry, University of Bonn, Bonn, Germany
| | - Robert Hültenschmidt
- Department of Prosthetic Dentistry, Preclinical Education and Materials Science, School of Dentistry, University of Bonn, Bonn, Germany
| | - Stefan Bayer
- Department of Prosthetic Dentistry, Preclinical Education and Materials Science, School of Dentistry, University of Bonn, Bonn, Germany
| | - Helmut Stark
- Department of Prosthetic Dentistry, Preclinical Education and Materials Science, School of Dentistry, University of Bonn, Bonn, Germany
| | - Ludger Keilig
- Department of Oral Technology, School of Dentistry, University of Bonn, Bonn, Germany.,Department of Prosthetic Dentistry, Preclinical Education and Materials Science, School of Dentistry, University of Bonn, Bonn, Germany
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Al-Sarar AS, Abobakr Y, Bayoumi AE, Hussein HI. Cytotoxic and genotoxic effects of abamectin, chlorfenapyr, and imidacloprid on CHOK1 cells. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:17041-17052. [PMID: 26122579 DOI: 10.1007/s11356-015-4927-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2015] [Accepted: 06/17/2015] [Indexed: 06/04/2023]
Abstract
The cytotoxicity and genotoxicity of abamectin, chlorfenapyr, and imidacloprid have been evaluated on the Chinese hamster ovary (CHOK1) cells. Neutral red incorporation (NRI), total cellular protein content (TCP), and methyl tetrazolium (MTT) assays were followed to estimate the mid-point cytotoxicity values, NRI50, TCP50, and MTT50, respectively. The effects of the sublethal concentration (NRI25) on glutathione S-transferase (GST), glutathione reductase (GRD), glutathione peroxidase (GPX), and total glutathione content have been evaluated in the presence and absence of reduced glutathione (GSH), vitamin C, and vitamin E. The genotoxicity was evaluated using chromosomal aberrations (CA), micronucleus (MN) formation, and DNA fragmentation techniques in the presence and absence of the metabolic activation system, S9 mix. Abamectin was the most cytotoxic pesticide followed by chlorfenapyr, while imidacloprid was the least cytotoxic one. The glutathione redox cycle components were altered by the tested pesticides in the absence and presence of the tested antioxidants. The results of genotoxicity indicate that abamectin, chlorfenapyr, and imidacloprid have potential genotoxic effects on CHOK1 cells under the experimental conditions.
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Affiliation(s)
- Ali S Al-Sarar
- Department of Plant Protection, College of Food and Agriculture Sciences, King Saud University, P.O. Box 2460, Riyadh, 11451, Saudi Arabia
| | - Yasser Abobakr
- Department of Plant Protection, College of Food and Agriculture Sciences, King Saud University, P.O. Box 2460, Riyadh, 11451, Saudi Arabia.
| | - Alaa E Bayoumi
- Department of Plant Protection, College of Food and Agriculture Sciences, King Saud University, P.O. Box 2460, Riyadh, 11451, Saudi Arabia
| | - Hamdy I Hussein
- Department of Plant Protection, College of Food and Agriculture Sciences, King Saud University, P.O. Box 2460, Riyadh, 11451, Saudi Arabia
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15
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Ye C, Zhou X, Telang A, Gao H, Ren Z, Qin H, Suslov S, Gill AS, Mannava SR, Qian D, Doll GL, Martini A, Sahai N, Vasudevan VK. Surface amorphization of NiTi alloy induced by Ultrasonic Nanocrystal Surface Modification for improved mechanical properties. J Mech Behav Biomed Mater 2015; 53:455-462. [PMID: 26410178 DOI: 10.1016/j.jmbbm.2015.09.005] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 09/01/2015] [Accepted: 09/04/2015] [Indexed: 10/23/2022]
Abstract
We report herein the effects of Ultrasonic Nano-crystal Surface Modification (UNSM), a severe surface plastic deformation process, on the microstructure, mechanical (hardness, wear), wettability and biocompatibility properties of NiTi shape memory alloy. Complete surface amorphization of NiTi was achieved by this process, which was confirmed by X-ray diffraction and high-resolution transmission electron microscopy. The wear resistance of the samples after UNSM processing was significantly improved compared with the non-processed samples due to increased surface hardness of the alloy by this process. In addition, cell culture study demonstrated that the biocompatibility of the samples after UNSM processing has not been compromised compared to the non-processed sample. The combination of high wear resistance and good biocompatibility makes UNSM an appealing process for treating alloy-based biomedical devices.
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Affiliation(s)
- Chang Ye
- Department of Mechanical Engineering, University of Akron, Akron, OH 44325, United States.
| | - Xianfeng Zhou
- Department of Mechanical Engineering, University of Akron, Akron, OH 44325, United States; Department of Polymer Science, University of Akron, Akron, OH 44325, United States
| | - Abhishek Telang
- Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, OH 45221, United States
| | - Hongyu Gao
- School of Engineering, University of California - Merced, Merced, CA 95343, United States
| | - Zhencheng Ren
- Department of Mechanical Engineering, University of Akron, Akron, OH 44325, United States
| | - Haifeng Qin
- Timken Engineered Surfaces Laboratories, University of Akron, Akron, OH 44325, United States
| | - Sergey Suslov
- Qatar Environment and Energy Research Institute (QEERI), Qatar Foundation, Doha, Qatar
| | - Amrinder S Gill
- Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, OH 45221, United States
| | - S R Mannava
- Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, OH 45221, United States
| | - Dong Qian
- Department of Mechanical Engineering, University of Texas at Dallas, Richardson, TX 75080-3021, United States
| | - Gary L Doll
- Timken Engineered Surfaces Laboratories, University of Akron, Akron, OH 44325, United States
| | - Ashlie Martini
- School of Engineering, University of California - Merced, Merced, CA 95343, United States
| | - Nita Sahai
- Department of Polymer Science, University of Akron, Akron, OH 44325, United States; Department of Geology, University of Akron, Akron, OH 44325, United States; Integrated Bioscience, University of Akron, Akron, OH 44325, United States
| | - Vijay K Vasudevan
- Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, OH 45221, United States
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16
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Lee JH, Seo SH, Lee SB, Om JY, Kim KM, Kim KN. Cytotoxicity and terminal differentiation of human oral keratinocyte by indium ions from a silver–palladium–gold–indium dental alloy. Dent Mater 2015; 31:123-33. [DOI: 10.1016/j.dental.2014.11.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2014] [Revised: 08/13/2014] [Accepted: 11/10/2014] [Indexed: 12/24/2022]
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Milheiro A, Nozaki K, Kleverlaan CJ, Muris J, Miura H, Feilzer AJ. In vitro cytotoxicity of metallic ions released from dental alloys. Odontology 2014; 104:136-42. [PMID: 25549610 DOI: 10.1007/s10266-014-0192-z] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Accepted: 12/15/2014] [Indexed: 10/24/2022]
Abstract
The cytotoxicity of a dental alloy depends on, but is not limited to, the extent of its corrosion behavior. Individual ions may have effects on cell viability that are different from metals interacting within the alloy structure. We aimed to investigate the cytotoxicity of individual metal ions in concentrations similar to those reported to be released from Pd-based dental alloys on mouse fibroblast cells. Metal salts were used to prepare seven solutions (concentration range 100 ppm-1 ppb) of the transition metals, such as Ni(II), Pd(II), Cu(II), and Ag(I), and the metals, such as Ga(III), In(III), and Sn(II). Cytotoxicity on mouse fibroblasts L929 was evaluated using the MTT assay. Ni, Cu, and Ag are cytotoxic at 10 ppm, Pd and Ga at 100 ppm. Sn and In were not able to induce cytotoxicity at the tested concentrations. Transition metals were able to induce cytotoxic effects in concentrations similar to those reported to be released from Pd-based dental alloys. Ni, Cu, and Ag were the most cytotoxic followed by Pd and Ga; Sn and In were not cytotoxic. Cytotoxic reactions might be considered in the etiopathogenesis of clinically observed local adverse reactions.
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Affiliation(s)
- Ana Milheiro
- Department of Dental Materials Science, ACTA, University of Amsterdam and VU University, Gustav Mahlerlaan 3004, 1081 LA, Amsterdam, The Netherlands.
| | - Kosuke Nozaki
- Department of Material Biofunctions, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo, 101-0062, Japan
| | - Cornelis J Kleverlaan
- Department of Dental Materials Science, ACTA, University of Amsterdam and VU University, Gustav Mahlerlaan 3004, 1081 LA, Amsterdam, The Netherlands
| | - Joris Muris
- Department of Dental Materials Science, ACTA, University of Amsterdam and VU University, Gustav Mahlerlaan 3004, 1081 LA, Amsterdam, The Netherlands
| | - Hiroyuki Miura
- Department of Fixed Prosthodontics, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8510, Japan
| | - Albert J Feilzer
- Department of Dental Materials Science, ACTA, University of Amsterdam and VU University, Gustav Mahlerlaan 3004, 1081 LA, Amsterdam, The Netherlands
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Elshahawy W, Shohieb F, Yehia H, Etman W, Watanabe I, Kramer P. Cytotoxic effect of elements released clinically from gold and CAD-CAM fabricated ceramic crowns. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.tdj.2014.10.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Elshahawy W, Watanabe I. Biocompatibility of dental alloys used in dental fixed prosthodontics. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.tdj.2014.07.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Song YH, Kim MK, Park EJ, Song HJ, Anusavice KJ, Park YJ. Cytotoxicity of alloying elements and experimental titanium alloys by WST-1 and agar overlay tests. Dent Mater 2014; 30:977-83. [PMID: 24946979 DOI: 10.1016/j.dental.2014.05.012] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2013] [Revised: 04/10/2014] [Accepted: 05/21/2014] [Indexed: 11/30/2022]
Abstract
OBJECTIVE This study was performed to evaluate the biocompatibility of nine types of pure metals using 36 experimental prosthetic titanium-based alloys containing 5, 10, 15, and 20wt% of each substituted metal. METHODS The cell viabilities for pure metals on Ti alloys that contain these elements were compared with that of commercially pure (CP) Ti using the WST-1 test and agar overlay test. RESULTS The ranking of pure metal cytotoxicity from most potent to least potent was: Co>Cu>In>Ag>Cr>Sn>Au>Pd>Pt>CP Ti. The cell viability ratios for pure Co, Cu, In, and Ag were 13.9±4.6%, 21.7±10.4%, 24.1±5.7%, and 24.8±6.0%, respectively, which were significantly lower than that for the control group (p<0.05). Pure Pd and Pt demonstrated good biocompatibility with cell viabilities of 93.8±9.6% and 97.2±7.1%, respectively. The Ti-5Pd alloy exhibited the highest cell viability (128.4±21.4%), which was greater than that of CP Ti. By alloying pure Co or Cu with Ti, the cell viabilities for the Ti-xCo and Ti-xCu alloys increased significantly up to 10wt% of the alloying element followed by a gradual decrease with a further increase in the concentration of the alloying element. Based on the agar overlay test, pure Ag, Co, Cr, Cu, and In were ranked as 'moderately cytotoxic', whereas all Ti alloys were ranked as 'noncytotoxic'. SIGNIFICANCE The cytotoxicity of pure Ag, Co, Cr, Cu, and In suggests a need for attention in alloy design. The cytotoxicity of alloying elements became more biocompatible when they were alloyed with titanium. However, the cytotoxicity of titanium alloys was observed when the concentration of the alloying element exceeded its respective allowable limit. The results obtained in this study can serve as a guide for the development of new Ti-based alloy systems.
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Affiliation(s)
- Yo-Han Song
- Department of Dental Materials and MRC for Biomineralization Disorders, School of Dentistry, Chonnam National University, Gwangju 500-757, Republic of Korea
| | - Min-Kang Kim
- Department of Dental Materials and MRC for Biomineralization Disorders, School of Dentistry, Chonnam National University, Gwangju 500-757, Republic of Korea
| | - Eun-Jin Park
- Department of Dental Materials and MRC for Biomineralization Disorders, School of Dentistry, Chonnam National University, Gwangju 500-757, Republic of Korea
| | - Ho-Jun Song
- Department of Dental Materials and MRC for Biomineralization Disorders, School of Dentistry, Chonnam National University, Gwangju 500-757, Republic of Korea
| | - Kenneth J Anusavice
- Department of Restorative Dental Sciences, College of Dentistry, University of Florida, Gainesville, FL 32610-0415, USA
| | - Yeong-Joon Park
- Department of Dental Materials and MRC for Biomineralization Disorders, School of Dentistry, Chonnam National University, Gwangju 500-757, Republic of Korea.
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In vitro degradation and biocompatibility of Fe-Pd and Fe-Pt composites fabricated by spark plasma sintering. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013; 35:43-53. [PMID: 24411350 DOI: 10.1016/j.msec.2013.10.023] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Revised: 10/12/2013] [Accepted: 10/21/2013] [Indexed: 11/23/2022]
Abstract
In order to obtain biodegradable Fe-based materials with similar mechanical properties as 316L stainless steel and faster degradation rate than pure iron, Fe-5 wt.%Pd and Fe-5 wt.%Pt composites were prepared by spark plasma sintering with powders of pure Fe and Pd/Pt, respectively. The grain size of Fe-5 wt.%Pd and Fe-5 wt.%Pt composites was much smaller than that of as-cast pure iron. The metallic elements Pd and Pt were uniformly distributed in the matrix and the mechanical properties of these materials were improved. Uniform corrosion of Fe-Pd and Fe-Pt composites was observed in both electrochemical tests and immersion tests, and the degradation rates of Fe-Pd and Fe-Pt composites were much faster than that of pure iron. It was found that viabilities of mouse fibroblast L-929 cells and human umbilical vein endothelial cells (ECV304) cultured in extraction mediums of Fe-Pd and Fe-Pt composites were close to that of pure iron. After 4 days' culture, the viabilities of L-929 and ECV304 cells in extraction medium of experimental materials were about 80%. The result of direct contact cytotoxicity also indicated that experimental materials exhibited no inhibition on vascular endothelial process. Meanwhile, iron ions released from experimental materials could inhibit proliferation of vascular smooth muscle cells (VSMC), which may be beneficial for hindering vascular restenosis. Furthermore, compared with that of as-cast pure iron, the hemolysis rates of Fe-Pd and Fe-Pt composites were slightly higher, but still within the range of 5%, which is the criteria for good blood compatibility. The numbers of platelet adhered on the surface of Fe-Pd and Fe-Pt composites were lower than that of pure iron, and the morphology of platelets kept spherical. To sum up, the Fe-5 wt.%Pd and Fe-5 wt.%Pt composites exhibited good mechanical properties and degradation behavior, closely approaching the requirements for biodegradable metallic stents.
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Park YJ, Song YH, An JH, Song HJ, Anusavice KJ. Cytocompatibility of pure metals and experimental binary titanium alloys for implant materials. J Dent 2013; 41:1251-8. [PMID: 24060476 DOI: 10.1016/j.jdent.2013.09.003] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Revised: 09/11/2013] [Accepted: 09/13/2013] [Indexed: 11/20/2022] Open
Abstract
OBJECTIVE This study was performed to evaluate the biocompatibility of nine types of pure metal ingots (Ag, Al, Cr, Cu, Mn, Mo, Nb, V, Zr) and 36 experimental titanium (Ti) alloys containing 5, 10, 15, and 20 wt% of each alloying element. METHODS The cell viabilities for each test group were compared with that of CP-Ti using the WST-1 test and agar overlay test. RESULTS The ranking of pure metal cytotoxicity from most potent to least potent was as follows: Cu>Al>Ag>V>Mn>Cr>Zr>Nb>Mo>CP-Ti. The mean cell viabilities for pure Cu, Al, Ag, V, and Mn were 21.6%, 25.3%, 31.7%, 31.7%, and 32.7%, respectively, which were significantly lower than that for the control group (p<0.05). The mean cell viabilities for pure Zr and Cr were 74.1% and 60.6%, respectively (p<0.05). Pure Mo and Nb demonstrated good biocompatibility with mean cell viabilities of 93.3% and 93.0%, respectively. The mean cell viabilities for all the Ti-based alloy groups were higher than 80% except for Ti-20 Nb (79.6%) and Ti-10 V (66.9%). The Ti-10 Nb alloy exhibited the highest cell viability (124.8%), which was higher than that of CP-Ti. Based on agar overlay test, pure Ag, Cr, Cu, Mn, and V were ranked as 'moderately cytotoxic', whereas the rest of the tested pure metals and all Ti alloys, except Ti-10 V (mild cytotoxicity), were ranked as 'noncytotoxic'. SIGNIFICANCE The results obtained in this study can serve as a guide for the development of new Ti-based alloy implant systems.
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Affiliation(s)
- Yeong-Joon Park
- Department of Dental Materials and MRC for Biomineralization Disorders, School of Dentistry, Chonnam National University, Gwangju 500-757, South Korea.
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Abstract
SummaryPrevious studies have shown that palladium has toxic effects on the kidney and liver, leads to deterioration of the general condition of animals, and could cause allergy in animals and humans. Considering the limited data about the influence of palladium on the cardiovascular system, the aim of our study was to evaluate the effects of palladium on the heart from available published data, and to compare the toxicity of inorganic and organic palladium compounds. Relevant studies for our review were identified from PubMed and Scopus databases. The search terms included »palladium «, »palladium compound«, »cardiotoxicity«, »toxicity«, »heart«, »myocardium«, »oxidative stress« and »myocardial enzyme«, as well as combinations of these terms. There were only two published studies with the primary purpose to investigate the effect of palladium on the cardiovascular system, while others registered the side-effects of palladium compounds on the heart. Palladium could cause arrhythmias, a drop in blood pressure, decrease of the heart rate, as well as death of experimental animals. Based on the presented data it seems that palladium does not express significant cardiac toxicity when it is bound in an organic compound. Further investigation of the effects of palladium on the heart is necessary for a clear picture of the nature and extent of its cardiac toxicity.
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Wu J, Wang L, He J, Zhu C. In vitro cytotoxicity of Cu2+, Zn2+, Ag+ and their mixtures on primary human endometrial epithelial cells. Contraception 2012; 85:509-18. [DOI: 10.1016/j.contraception.2011.09.016] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2011] [Revised: 09/15/2011] [Accepted: 09/29/2011] [Indexed: 11/28/2022]
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Ratnikova TA, Bebber MJ, Huang G, Larcom LL, Ke PC. Cytoprotective properties of a fullerene derivative against copper. NANOTECHNOLOGY 2011; 22:405101. [PMID: 21896981 DOI: 10.1088/0957-4484/22/40/405101] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
To delineate the complexity of the response of cells to nanoparticles we have performed a study on HT-29 human colon carcinoma cells exposed first to a fullerene derivative C(60)(OH)(20) and then to physiological copper ions. Our cell viability, proliferation, and intracellular reactive oxygen species (ROS) production assays clearly indicated that C(60)(OH)(20) suppressed cell damage as well as ROS production induced by copper, probably through neutralization of the metal ions by C(60)(OH)(20) in the extracellular space, as well as by adsorption and uptake of the nanoparticles surface-modified by the biomolecular species in the cell medium. This double-exposure study provides new data on the effects of nanoparticles on cell metabolism and may aid the treatment of oxidant-mediated diseases using nanomedicine.
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Affiliation(s)
- Tatsiana A Ratnikova
- Department of Physics and Astronomy, COMSET, Clemson University, Clemson, SC 29634-0978, USA
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Kang KA, Kim JS, Zhang R, Piao MJ, Maeng YH, Kang MY, Lee IK, Kim BJ, Hyun JW. KIOM-4 Protects against Oxidative Stress-Induced Mitochondrial Damage in Pancreatic β-cells via Its Antioxidant Effects. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE : ECAM 2011; 2011:978682. [PMID: 21799698 PMCID: PMC3137873 DOI: 10.1093/ecam/neq007] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/22/2009] [Accepted: 12/29/2009] [Indexed: 01/29/2023]
Abstract
The protective effect of KIOM-4, a mixture of plant extracts, was examined against streptozotocin (STZ)-induced mitochondrial oxidative stress in rat pancreatic β-cells (RINm5F). KIOM-4 scavenged superoxide and hydroxyl radicals generated by xanthine/xanthine oxidase and Fenton reaction (FeSO(4)/H(2)O(2)), respectively, in a cell-free chemical system. In addition, a marked increase in mitochondrial reactive oxygen species (ROS) was observed in STZ-induced diabetic cells; this increase was attenuated by KIOM-4 treatment. Mitochondrial manganese superoxide dismutase (Mn SOD) activity and protein expression were down-regulated by STZ treatment and up-regulated by KIOM-4 treatment. In addition, NF-E2 related factor 2 (Nrf2), a transcription factor for Mn SOD, was up-regulated by KIOM-4. KIOM-4 prevented STZ-induced mitochondrial lipid peroxidation, protein carbonyl and DNA modification. Moreover, KIOM-4 treatment restored the loss of mitochondrial membrane potential (Δψ) that was induced by STZ treatment, and inhibited the translocation of cytochrome c from the mitochondria to the cytosol. In addition, KIOM-4 treatment elevated the level of ATP, succinate dehydrogenase activity and insulin level, which were reduced by STZ treatment. These results suggest that KIOM-4 exhibits a protective effect through its antioxidant effect and the attenuation of mitochondrial dysfunction in STZ-induced diabetic cells.
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Affiliation(s)
- Kyoung Ah Kang
- School of Medicine, Jeju National University, Jeju-si 690-756, Republic of Korea
| | - Jin Sook Kim
- Diabetic Complication Research Center, Division of Traditional Korean Medicine Integrated Research, Korea Institute of Oriental Medicine, Daejeon, Republic of Korea
| | - Rui Zhang
- School of Medicine, Jeju National University, Jeju-si 690-756, Republic of Korea
| | - Mei Jing Piao
- School of Medicine, Jeju National University, Jeju-si 690-756, Republic of Korea
| | - Young Hee Maeng
- School of Medicine, Jeju National University, Jeju-si 690-756, Republic of Korea
| | - Mi Young Kang
- Department of Biomaterials, DNA Repair Center, Chosun University, Gwangju, Republic of Korea
| | - In Kyung Lee
- Department of Microbiology and Caner Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Bum Joon Kim
- Department of Microbiology and Caner Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Jin Won Hyun
- School of Medicine, Jeju National University, Jeju-si 690-756, Republic of Korea
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CHAI Z, LI F, FANG M, WANG Y, MA S, XIAO Y, HUANG L, CHEN J. The bonding property and cytotoxicity of a dental adhesive incorporating a new antibacterial monomer. J Oral Rehabil 2011; 38:849-56. [DOI: 10.1111/j.1365-2842.2011.02212.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Ratna D, Karger-Kocsis J. Shape memory polymer system of semi-interpenetrating network structure composed of crosslinked poly (methyl methacrylate) and poly (ethylene oxide). POLYMER 2011. [DOI: 10.1016/j.polymer.2010.12.054] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Tanaka R, Goi Y, Ishihara K, Ueda K, Narushima T, Ohtsu H, Ohuchi K, Hiratsuka M, Hirasawa N. Assessment of the release of nickel from biomaterials in vivo and in vitro: enhancement by lipopolysaccharide. Inflamm Regen 2011. [DOI: 10.2492/inflammregen.31.302] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Chaves CDAL, Machado AL, Carlos IZ, Giampaolo ET, Pavarina AC, Vergani CE. Cytotoxicity of monomers, plasticizer and degradation by-products released from dental hard chairside reline resins. Dent Mater 2010; 26:1017-23. [DOI: 10.1016/j.dental.2010.06.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2010] [Accepted: 06/25/2010] [Indexed: 10/19/2022]
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Abstract
In the biomedical field, palladium has primarily been used as a component of alloys for dental prostheses. However, recent research has shown the utility of palladium alloys for devices such as vascular stents that do not distort magnetic resonance images. Dental palladium alloys may contain minor or major percentages of palladium. As a minor constituent, palladium hardens, strengthens and increases the melting range of alloys. Alloys that contain palladium as the major component also contain copper, gallium and sometimes tin to produce strong alloys with high stiffness and relatively low corrosion rates. All current evidence suggests that palladium alloys are safe, despite fears about harmful effects of low-level corrosion products during biomedical use. Recent evidence suggests that palladium poses fewer biological risks than other elements, such as nickel or silver. Hypersensitivity to palladium alone is rare, but accompanies nickel hypersensitivity 90-100% of the time. The unstable price of palladium continues to influence the use of palladium alloys in biomedicine.
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Affiliation(s)
- John C Wataha
- University of Washington School of Dentistry, Seattle, WA, USA.
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Zhang R, Kim JS, Kang KA, Piao MJ, Kim KC, Hyun JW. Protective Mechanism of KIOM-4 in Streptozotocin-Induced Pancreatic β-Cells Damage Is Involved in the Inhibition of Endoplasmic Reticulum Stress. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE : ECAM 2010; 2011:231938. [PMID: 20924496 PMCID: PMC2949593 DOI: 10.1155/2011/231938] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/19/2010] [Accepted: 08/27/2010] [Indexed: 02/07/2023]
Abstract
Endoplasmic reticulum stress-mediated apoptosis plays an important role in the destruction of pancreatic β-cells and contributes to the development of type 1 diabetes. The present study examined the effect of KIOM-4, a mixture of four plant extracts, on streptozotocin- (STZ-) induced endoplasmic reticulum (ER) stress in rat pancreatic β-cells (RINm5F). KIOM-4 was found to inhibit STZ-induced apoptotic cell death, confirmed by formation of apoptotic bodies and DNA fragmentation. STZ was found to induce the characteristics of ER stress; mitochondrial Ca(2+) overloading, enhanced ER staining, release of glucose-regulated protein 78 (GRP78), phosphorylation of RNA-dependent protein kinase (PKR) like ER kinase (PERK) and eukaryotic initiation factor-2α (eIF-2α), cleavage of activating transcription factor 6 (ATF6) and caspase 12, and upregulation of CCAAT/enhancer-binding protein-homologous protein (CHOP). However, KIOM-4 attenuated these changes induced by STZ. Furthermore, KIOM-4 suppressed apoptosis induced by STZ in CHOP downregulated cells using CHOP siRNA. These results suggest that KIOM-4 exhibits protective effects in STZ-induced pancreatic β-cell damage, by interrupting the ER stress-mediated pathway.
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Affiliation(s)
- Rui Zhang
- School of Medicine, Jeju National University, Jeju-si 690-756, Republic of Korea
| | - Jin Sook Kim
- Diabetic Complication Research Center, Division of Traditional Korean Medicine Integrated Research, Korea Institute of Oriental Medicine, Daejeon 305-811, Republic of Korea
| | - Kyoung Ah Kang
- School of Medicine, Jeju National University, Jeju-si 690-756, Republic of Korea
| | - Mei Jing Piao
- School of Medicine, Jeju National University, Jeju-si 690-756, Republic of Korea
| | - Ki Cheon Kim
- School of Medicine, Jeju National University, Jeju-si 690-756, Republic of Korea
| | - Jin Won Hyun
- School of Medicine, Jeju National University, Jeju-si 690-756, Republic of Korea
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Čolić M, Rudolf R, Stamenković D, Anžel I, Vučević D, Jenko M, Lazić V, Lojen G. Relationship between microstructure, cytotoxicity and corrosion properties of a Cu-Al-Ni shape memory alloy. Acta Biomater 2010; 6:308-17. [PMID: 19540942 DOI: 10.1016/j.actbio.2009.06.027] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2009] [Revised: 06/12/2009] [Accepted: 06/16/2009] [Indexed: 10/20/2022]
Abstract
Cu-Al-Ni shape memory alloys (SMAs) have been investigated as materials for medical devices, but their biomedical application is still limited. The aim of this work was to compare the microstructure, corrosion and cytotoxicity in vitro of a Cu-Al-Ni SMA. Rapidly solidified (RS) thin ribbons, manufactured via melt spinning, were used for the tests. The control alloy was a permanent mould casting of the same composition, but without shape memory effect. The results show that RS ribbons are significantly more resistant to corrosion compared with the control alloy, as judged by the lesser release of Cu and Ni into the conditioning medium. These results correlate with the finding that RS ribbons were not cytotoxic to L929 mouse fibroblasts and rat thymocytes. In addition, the RS ribbon conditioning medium inhibited cellular proliferation and IL-2 production by activated rat splenocytes to a much lesser extent. The inhibitory effects were almost completely abolished by conditioning the RS ribbons in culture medium for 4 weeks. Microstructural analysis showed that RS ribbons are martensitic, with boron particles as a minor phase. In contrast, the control Cu-Al-Ni alloy had a complex multiphase microstructure. Examination of the alloy surfaces after conditioning by energy dispersive X-ray and Auger electron spectroscopy showed the formation of Cu and Al oxide layers and confirmed that the metals in RS ribbons are less susceptible to oxidation and corrosion compared with the control alloy. In conclusion, these results suggest that rapid solidification significantly improves the corrosion stability and biocompatibility in vitro of Cu-Al-Ni SMA ribbons.
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Brackett MG, Marshall A, Lockwood PE, Lewis JB, Messer RLW, Bouillaguet S, Wataha JC. Inflammatory suppression by endodontic sealers after aging 12 weeks In vitro. J Biomed Mater Res B Appl Biomater 2009; 91:839-844. [PMID: 19572299 DOI: 10.1002/jbm.b.31465] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Dental endodontic sealers are in intimate contact with tissues around the root apex (periapical area) for extended periods. New endodontic sealers have been developed in the past decade, but the biological responses to many new products are not well documented. In this study, we assessed in vitro monocytic cytotoxic and inflammatory responses to several contemporary endodontic sealers. AH-Plus (AH), Pulp Canal Sealer (PC), Epiphany (EPH), Endo-Rez (ER), and an experimental Endo-Rez (ERx) were initially placed in buffered-saline for 12 weeks to simulate in vivo use. After "aging," specimens were placed in direct contact with THP1 monocytes for 72 h and their cytotoxicity (mitochondrial response; MTT) or ability to trigger or suppress cytokine secretion (ELISA; TNFalpha, IL1beta, IL=6; +/- lipopolysaccharide (LPS) exposure) were measured relative to Teflon (Tf) negative controls. Cellular responses among conditions were compared with ANOVA and Tukey post-hoc analysis (alpha = 0.05). Two of the five sealers, EPH and PC, still suppressed cell mitochondrial activity by 70% or more after 12 weeks of conditioning in saline. No sealer alone activated monocytic TNFalpha, IL1beta, or IL6 secretion (p > 0.05 vs. +LPS controls). When THP1 were activated by LPS after exposure to the sealers, differential suppression of TNFalpha, IL1beta, and IL6 secretion was observed for two of the five sealers tested. (EPH and PC) This data suggest that common endodontic sealers do not activate monocytic TNFalpha, IL1beta, and IL6 secretion in vitro by themselves, but degradation products of the sealers may suppress activation of monocytes.
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Affiliation(s)
- Martha Goël Brackett
- Department of Oral Rehabilitation, School of Dentistry, Medical College of Georgia, Augusta, Georgia
| | - Aksana Marshall
- Department of Oral Rehabilitation, School of Dentistry, Medical College of Georgia, Augusta, Georgia
| | - Petra E Lockwood
- Department of Oral Biology, School of Dentistry, Medical College of Georgia, Augusta, Georgia
| | - Jill B Lewis
- Department of Oral Biology, School of Dentistry, Medical College of Georgia, Augusta, Georgia
| | - Regina L W Messer
- Department of Oral Biology, School of Dentistry, Medical College of Georgia, Augusta, Georgia
| | - Serge Bouillaguet
- Department of Cariology and Endodontology, University of Geneva, Geneva, Switzerland
| | - John C Wataha
- Department of Restorative Dentistry, School of Dentistry, University of Washington, Seattle, Washington
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Wataha JC, Hobbs DT, Lockwood PE, Davis RR, Elvington MC, Lewis JB, Messer RLW. Peroxotitanates for biodelivery of metals. J Biomed Mater Res B Appl Biomater 2009; 91:489-496. [PMID: 19701912 DOI: 10.1002/jbm.b.31402] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Metal-based drugs are largely undeveloped in pharmacology. One limiting factor is the systemic toxicity of metal-based compounds. A solid-phase, sequestratable delivery agent for local delivery of metals could reduce systemic toxicity, facilitating new drug development in this nascent area. Amorphous peroxotitanates (APT) are ion-exchange materials with high affinity for several heavy metal ions and have been proposed to deliver or sequester metal ions in biological contexts. In the current study, we tested a hypothesis that APTs are able to deliver metals or metal compounds to cells. We exposed fibroblasts (L929) or monocytes (THP1) to metal-APT materials for 72 h in vitro and then measured cellular mitochondrial activity (SDH-MTT method) to assess the biological impact of the metal-APT materials versus metals or APT alone. APT alone did not significantly affect cellular mitochondrial activity, but all metal-APT materials suppressed the mitochondrial activity of fibroblasts (by 30-65% of controls). The concentration of metal-APT materials required to suppress cellular mitochondrial activity was below that required for metals alone, suggesting that simple extracellular release of the metals from the metal-APT materials was not the primary mechanism of mitochondrial suppression. In contrast to fibroblasts, no metal-APT material had a measurable effect on THP1 monocyte mitochondrial activity, despite potent suppression by metals alone. This latter result suggested that "biodelivery" by metal-APT materials may be cell type-specific. Therefore, it appears that APTs are plausible solid-phase delivery agents of metals or metal compounds to some types of cells for potential therapeutic effect.
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Affiliation(s)
- John C Wataha
- Department of Restorative Dentistry, University of Washington, Seattle, Washington 98026
| | - David T Hobbs
- Savannah River National Laboratory, Aiken, South Carolina 29801
| | - Petra E Lockwood
- Department of Oral Biology, Medical College of Georgia School of Dentistry, Augusta, Georgia 30912
| | - Ryan R Davis
- Department of Oral Biology, Medical College of Georgia School of Dentistry, Augusta, Georgia 30912
| | | | - Jill B Lewis
- Department of Oral Biology, Medical College of Georgia School of Dentistry, Augusta, Georgia 30912
| | - Regina L W Messer
- Department of Oral Biology, Medical College of Georgia School of Dentistry, Augusta, Georgia 30912
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Ardlin BI, Lindholm-Sethson B, Dahl JE. Corrosion of dental nickel-aluminum bronze with a minor gold content-mechanism and biological impact. J Biomed Mater Res B Appl Biomater 2009; 88:465-73. [DOI: 10.1002/jbm.b.31143] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Brackett MG, Marshall A, Lockwood PE, Lewis JB, Messer RLW, Bouillaguet S, Wataha JC. Cytotoxicity of endodontic materials over 6-weeksex vivo. Int Endod J 2008; 41:1072-8. [DOI: 10.1111/j.1365-2591.2008.01471.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Díaz M, Sevilla P, Galán AM, Escolar G, Engel E, Gil FJ. Evaluation of ion release, cytotoxicity, and platelet adhesion of electrochemical anodized 316 L stainless steel cardiovascular stents. J Biomed Mater Res B Appl Biomater 2008; 87:555-61. [DOI: 10.1002/jbm.b.31144] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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39
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WATAHA J, MALCOLM C. Effect of alloy surface composition on release of elements from dental casting alloys. J Oral Rehabil 2008. [DOI: 10.1111/j.1365-2842.1996.tb00896.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Brackett MG, Lockwood PE, Messer RLW, Lewis JB, Bouillaguet S, Wataha JC. In vitro cytotoxic response to lithium disilicate dental ceramics. Dent Mater 2008; 24:450-6. [PMID: 17675143 DOI: 10.1016/j.dental.2007.06.013] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2007] [Revised: 05/01/2007] [Accepted: 06/14/2007] [Indexed: 11/28/2022]
Abstract
OBJECTIVES The use of lithium disilicate dental ceramics is increasing in dentistry and previous reports have suggested that they may have greater biological risks than previously thought. We tested a hypothesis that composition and processing influence the biological properties of these ceramics. METHODS The cytotoxicity of two machined and three pressed lithium disilicate materials (n=6) were tested in vitro using mouse fibroblasts in direct contact with the materials for 72h. Cellular response was estimated by mitochondrial succinate dehydrogenase activity (MTT method). Mitochondrial activity was expressed as a percentage of Teflon controls, then compared to Teflon using 2-sided t-tests (alpha=0.05). Polished materials were aged in artificial saliva and tested for cytotoxicity periodically over 6 weeks, then were repolished (320grit SiC paper), aged and tested again for 4 weeks. RESULTS All materials significantly (50-70%) suppressed cellular mitochondrial activity in the initial week, but suppression decreased by 25-30% over the next 2 weeks. In weeks 4 and 6 some materials exhibited a cytotoxic 'relapse' of 10-20%. The cytotoxic response was no different for machined or pressed materials, but the presence of ZnO had at least an association with longer-term cytotoxicity and relapse. Repolishing to 320grit did not increase cytotoxicity significantly. SIGNIFICANCE Our results suggest that lithium disilicates are not biologically inert, and that many have a similar cytotoxicity dynamic regardless of small differences in composition or processing.
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Relationship between radial diffusion of copper ions released from a metal disk and cytotoxic effects. Comparison with results obtained using extracts. Bioelectrochemistry 2007; 72:94-101. [PMID: 18191620 DOI: 10.1016/j.bioelechem.2007.11.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2007] [Revised: 08/16/2007] [Accepted: 11/18/2007] [Indexed: 11/22/2022]
Abstract
The extended use of metallic biomaterials yields to increasing sources of metal ions within the human body and may result in inflammation of the surrounding tissues, cell damage, and cancer. The aim of this study was to investigate the relationship between the radial diffusion of metal ions released from a metal disk by the corrosion process and the toxic effect on a cell line that grew around it. Results obtained with the metal disks (direct contact) were compared with assays made with extracts obtained from the dissolution of a metallic sample ex situ and then added to the cell culture to elucidate the cause of apparent inconsistencies in previous reports. The change of copper concentration due to corrosion and transient diffusion of copper ions from the copper disks into the cell line was evaluated according to Fick's 2nd law. Surviving cells distribution was interpreted considering the radial and time-dependence of copper concentration. We concluded that the toxic effect on those cells close to metallic biomaterials may be underestimated when only the extract methodology is employed for cytotoxic tests or when during the experiments with disks the presence of concentration gradients and the non-homogeneous distribution of dead cells are disregarded.
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Frazzoli C, Dragone R, Mantovani A, Massimi C, Campanella L. Functional toxicity and tolerance patterns of bioavailable Pd(II), Pt(II), and Rh(III) on suspended Saccharomyces cerevisiae cells assayed in tandem by a respirometric biosensor. Anal Bioanal Chem 2007; 389:2185-94. [DOI: 10.1007/s00216-007-1623-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2007] [Revised: 08/29/2007] [Accepted: 09/11/2007] [Indexed: 10/22/2022]
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Geurtsen W. Biocompatibility of dental casting alloys. CRITICAL REVIEWS IN ORAL BIOLOGY AND MEDICINE : AN OFFICIAL PUBLICATION OF THE AMERICAN ASSOCIATION OF ORAL BIOLOGISTS 2007; 13:71-84. [PMID: 12097239 DOI: 10.1177/154411130201300108] [Citation(s) in RCA: 124] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Most cast dental restorations are made from alloys or commercially pure titanium (cpTi). Many orthodontic appliances are also fabricated from metallic materials. It has been documented in vitro and in vivo that metallic dental devices release metal ions, mainly due to corrosion. Those metallic components may be locally and systemically distributed and could play a role in the etiology of oral and systemic pathological conditions. The quality and quantity of the released cations depend upon the type of alloy and various corrosion parameters. No general correlation has been observed between alloy nobility and corrosion. However, it has been documented that some Ni-based alloys, such as beryllium-containing Ni alloys, exhibit increased corrosion, specifically at low pH. Further, microparticles are abraded from metallic restorations due to wear. In sufficient quantities, released metal ions-particularly Cu, Ni, Be, and abraded microparticles-can also induce inflammation of the adjacent periodontal tissues and the oral mucosa. While there is also some in vitro evidence that the immune response can be altered by various metal ions, the role of these ions in oral inflammatory diseases such as gingivitis and periodontitis is unknown. Allergic reactions due to metallic dental restorations have been documented. Ni has especially been identified as being highly allergenic. Interestingly, from 34% to 65.5% of the patients who are allergic to Ni are also allergic to Pd. Further, Pd allergy always occurrs with Ni sensitivity. In contrast, no study has been published which supports the hypothesis that dental metallic materials are mutagenic/genotoxic or might be a carcinogenic hazard to man. Taken together, very contradictory data have been documented regarding the local and systemic effects of dental casting alloys and metallic ions released from them. Therefore, it is of critical importance to elucidate the release of cations from metallic dental restorations in the oral environment and to determine the biological interactions of released metal components with oral and systemic tissues.
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Affiliation(s)
- Werner Geurtsen
- Department of Conservative Dentistry and Periodontology, Medical University Hannover, Hannover, Germany.
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Wylie CM, Shelton RM, Fleming GJP, Davenport AJ. Corrosion of nickel-based dental casting alloys. Dent Mater 2007; 23:714-23. [PMID: 16949144 DOI: 10.1016/j.dental.2006.06.011] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2005] [Revised: 03/31/2006] [Accepted: 06/20/2006] [Indexed: 10/24/2022]
Abstract
OBJECTIVES To study the microstructure, corrosion behaviour and cell culture response of two nickel-based dental casting alloys before and after a heat treatment to simulate porcelain firing. METHODS The microstructure was studied using scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX). Corrosion behaviour was evaluated by electrochemical measurements in artificial saliva at different values of pH in the presence of a crevice. 3T3 mouse fibroblasts were exposed indirectly to alloy specimens and the number of viable cells counted after 3 and 6 days compared to a control culture. RESULTS Small changes in microstructure were observed after heat treatment but had a negligible effect on the corrosion properties in the conditions tested. The alloy with a lower bulk level of Cr (12.6 wt.%) showed lower corrosion resistance, indicated by an increased passive current density and this stability was greatly reduced at pH 2.5, where crevice corrosion was observed. Selective dissolution occurred at regions within the microstructure containing lower levels of Cr and Mo. Furthermore, the proliferation of 3T3 mouse fibroblasts was reduced (p<0.05) when exposed indirectly to this alloy. The alloy containing a higher level of Cr (25 wt.%) showed superior corrosion resistance, which was associated with a more uniform distribution of Cr in the alloy microstructure. SIGNIFICANCE The presence of crevices combined with an inhomogeneous distribution of Cr in the microstructure can lead to accelerated corrosion of Ni-based alloys with lower Cr contents. This effect can be avoided by increasing the Cr content of the alloy.
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Affiliation(s)
- Christopher M Wylie
- Department of Metallurgy and Materials, University of Birmingham, Birmingham B15 2TT, UK
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Omata Y, Lewis JB, Lockwood PE, Tseng WY, Messer RL, Bouillaguet S, Wataha JC. Gold-induced reactive oxygen species (ROS) do not mediate suppression of monocytic mitochondrial or secretory function. Toxicol In Vitro 2006; 20:625-33. [PMID: 16377126 DOI: 10.1016/j.tiv.2005.11.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2005] [Revised: 10/31/2005] [Accepted: 11/14/2005] [Indexed: 10/25/2022]
Abstract
UNLABELLED The toxicity of anti-rheumatic gold compounds has limited their use and development, yet both the toxicological and therapeutic actions of these compounds remain unclear. In the current study, we tested the hypothesis that intracellular reactive oxygen species (ROS) induced by Au(I) or Au(III) compounds mediate their ability to suppress mitochondrial activity. METHODS Human THP1 monocytes were exposed to HAuCl(4) x 3H(2)O (Au(III)), or the anti-rheumatic compounds auranofin (AF) or gold sodium thiomalate (GSTM) for 6-72 h, after which mitochondrial activity (succinate dehydrogenase) was measured. To assess the role of cellular redox status as a mediator of mitochondrial suppression, monocytes were pre-treated with a pro-oxidant (t-butyl hydroquinone, t-BHQ) or antioxidant (N-acetyl cysteine, NAC ). ROS levels were measured 0-24h post-gold addition to determine their role as mediators of mitochondrial activity suppression. RESULTS AF was the most potent inhibitor of mitochondrial activity, followed by Au(III) and GSTM. Only Au(III) induced intracellular ROS; no ROS formation was observed in response to AF or GSTM exposure. Although anti- and pro-oxidants had some effects on mitochondrial suppression of Au compounds, collectively the data do not support redox effects or ROS formation as major mediators of Au-compound mitochondrial suppression. CONCLUSIONS Our results do not indicate that ROS and redox effects play major roles in mediating the cytotoxicity of AF, GSTM or Au(III).
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Affiliation(s)
- Yo Omata
- Hokkaido University, Sapporo, Japan
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Nakamura Y, Takahashi K, Satoh K, Shimetani A, Sakagami H, Nishikawa H. Role of Free Radicals and Metal Ions in Direct Current-Induced Cytotoxicity. J Endod 2006; 32:442-6. [PMID: 16631845 DOI: 10.1016/j.joen.2005.11.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2005] [Revised: 11/16/2005] [Accepted: 11/16/2005] [Indexed: 11/30/2022]
Abstract
The purpose of this study was to investigate the mechanism of direct current (DC)-induced cytotoxicity. To test the working hypothesis that electrolysis products are responsible for the DC-induced cytotoxicity, the cytotoxic effects between the direct and indirect DC treatment against human polymorphonuclear cells (PMNs) was compared. The indirect DC treatment (treatment with the culture medium exposed to DC) was comparable in cytotoxicity to the direct DC treatment, suggesting that electrolysis products have an important role in DC-induced cytotoxicity. Metal ions released from different electrodes into the culture medium were quantified by the inductively coupled plasma-mass spectroscopy. Higher concentrations of Ag, Zn, and Ni and chromium were released from Ag, Zn, and stainless steel (St) electrodes, respectively, whereas much lower concentrations of Ni and Ti were released from Ni-Ti electrode. Further, electron spin resonance spectroscopy with spin-trapping agent showed that the direct current with the following metal electrodes generated alkoxyl radical (St and Ni-Ti electrodes), hydrogen radical (Ag and Au electrodes), and both carbon and alkoxyl radicals (Zn electrode), respectively. These results suggest that free radicals and metal ions released from electrodes contribute to the cytotoxicity of DC treatment used for iontophoresis.
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Affiliation(s)
- Yuko Nakamura
- Department of Endodontics, Meikai, University School of Dentistry, Sakado, Saitama, Japan
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Matarese G, Picerno I, Caccamo D, Spataro P, Cordasco G, Ientile R. Increased transglutaminase activity was associated with IL-6 release in cultured human gingival fibroblasts exposed to dental cast alloys. Amino Acids 2006; 30:267-71. [PMID: 16583305 DOI: 10.1007/s00726-006-0295-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2005] [Accepted: 02/10/2006] [Indexed: 10/24/2022]
Abstract
Molecular mechanisms underlying gingival and periodontal inflammation caused by dental alloys are still poorly understood. Recently, it has been demonstrated that tissue transglutaminase can be involved in inflammatory cell response. The aim of this study was to evaluate effects of exposure to orthodontic materials on transglutaminase in cultured human gingival fibroblasts. The incubation with Ni-Ti heat-activated (T3) or Ni-Ti super-elastic (T4), and with Ni-Cr-Co (T2) alloys produced respectively 2.5-fold and 8-fold increases in IL-6 release compared with control cultures. Transglutaminase activity was significantly increased in cells exposed to T3 and T4 alloys (about 170% of control; p < 0.05), where it was mainly localized close to inner part of cell membrane. The exposure to T3 and T4 specimens significantly up-regulated also tTG expression compared with control cultures. These data first show an association between IL-6 release and tissue transglutaminase increases, suggesting that TGase-mediated reactions may play a major role in periodontal inflammation.
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Affiliation(s)
- G Matarese
- Department of Odontostomatology, University of Messina, Messina, Italy
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Kwok P, Schuster M, Boch K, Jacob P, Gleich O, Strutz J. Safety of gold in stapes surgery. Biomaterials 2005; 26:7132-5. [PMID: 16000223 DOI: 10.1016/j.biomaterials.2005.05.031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2005] [Accepted: 05/11/2005] [Indexed: 11/15/2022]
Abstract
Gold prostheses in middle ear surgery were found to have a higher extrusion rate than prostheses made from titanium. Incidences of deafness after insertion of a gold piston into the vestibule during stapes surgery have been observed. The aim of this study was to find out to what degree gold cations can diffuse from the prosthesis piston into the perilymph. For this, gold prostheses were incubated in artificial perilymph for four months, after which the gold content of the perilymph was analysed. As gold exhibits a special behaviour in complex fluids like the perilymph, a new analysing method was developed. The results show that gold does leak out of the pistons, that it can be reliably measured and that the amount of gold reaching the perilymph depends on the contact area. As the amount of gold measured in the perilymph stays far below the toxic level, it is very unlikely that the gold cations diffusing from a stapes prosthesis into the perilymph have a toxic effect on the inner ear hair cells. Inflammatory or allergic reactions to gold induced by direct tissue contact, however, cannot be excluded.
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Affiliation(s)
- P Kwok
- Ear, Nose and Throat Department, University of Regensburg, Germany.
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Venugopalan R, Messer RLW. The effect of a microcarrier suspension cell culture system on polarization measurements from Ni–Cr dental casting alloys. Dent Mater 2005; 21:993-8. [PMID: 16181670 DOI: 10.1016/j.dental.2005.01.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2004] [Accepted: 01/12/2005] [Indexed: 11/22/2022]
Abstract
OBJECTIVES Recent research has demonstrated that cells/cellular components can influence the corrosion or degradation of the implant material in addition to being challenged by the cytotoxic by-products the implant material may release. The overall objective of this research was to modify a microcarrier suspension cell culture system to incorporate an active corrosion experimental capacity. METHODS The ability to conduct polarization experiments on two Ni-Cr dental casting alloys under the following environmental conditions: media only, media plus serum, media plus serum and antibiotics (complete media), complete media with microcarriers, and complete media with cells grown on microcarriers; was evaluated during this initial study. RESULTS Results obtained were reproducible within sample groups (95% confidence level) indicating the precision of the corrosion set-up under all environmental conditions. These studies also show that media with serum and antibiotics (complete media) induced a significantly higher corrosion rate (95% confidence level) for both materials compared to the other test conditions. SIGNIFICANCE Future experiments will focus on cytotoxic effects caused by parametrically controlled corrosion experiments on the suspension cell cultures, including co-cultures.
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Affiliation(s)
- Ramakrishna Venugopalan
- Neuro-Modulation R&D, Codman and Shurtleff, A J&J Company, 325 Paramount Drive, Raynham, MA 02767, USA
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Ping P, Wang W, Chen X, Jing X. Poly(epsilon-caprolactone) polyurethane and its shape-memory property. Biomacromolecules 2005; 6:587-92. [PMID: 15762617 DOI: 10.1021/bm049477j] [Citation(s) in RCA: 204] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A series of segmented poly(epsilon-caprolactone) polyurethanes (PCLUs) were prepared from poly(epsilon-caprolactone) (PCL) diol, 2,4-toluene diisocyanate and ethylene glycol. The molecular weight (M(n)) of PCL was 500-10,000, and the soft-to-hard molar ratio was 1:2 to 1:6. Their shape-memory behaviors were investigated as a function of PCL molecular weight, PCLU composition, and thermal/mechanical history. When a deformation temperature 15-20 degrees C below T(m) was chosen, the lowest recovery temperature (LRT) was 15-18 degrees C below T(m), and the recovery ratio was 94-100% for tensile deformation of 300% and for compression of 2.7-fold. The reasons for this deformation-recovery procedure and the mechanism for this shape recovery below T(m) were discussed. The shape recovery was associated with the premelting of the crystals formed during the deformation and fixation, and, thus, it could be accomplished in the solid state. Its driving force was the inner stress stored in the deformed specimen during deformation and crystallization. Therefore, the LRT was a more practical temperature for shape-memory PCLU than T(m). It could be conveniently measured by means of thermal mechanical analysis. By adjusting the molecular weight of the PCL diol and the hard-to-soft ratio, the LRT of PCLU could be adjusted to the range of 37-42 degrees C, and reasonable rigidity could be retained after shape recovery, fulfilling the essential requirements of medical implantations.
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Affiliation(s)
- Peng Ping
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
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