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Nallanthighal S, Chan C, Murray TM, Mosier AP, Cady NC, Reliene R. Differential effects of silver nanoparticles on DNA damage and DNA repair gene expression in Ogg1-deficient and wild type mice. Nanotoxicology 2017; 11:996-1011. [PMID: 29046123 DOI: 10.1080/17435390.2017.1388863] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Due to extensive use in consumer goods, it is important to understand the genotoxicity of silver nanoparticles (AgNPs) and identify susceptible populations. 8-Oxoguanine DNA glycosylase 1 (OGG1) excises 8-oxo-7,8-dihydro-2-deoxyguanine (8-oxoG), a pro-mutagenic lesion induced by oxidative stress. To understand whether defects in OGG1 is a possible genetic factor increasing an individual's susceptibly to AgNPs, we determined DNA damage, genome rearrangements, and expression of DNA repair genes in Ogg1-deficient and wild type mice exposed orally to 4 mg/kg of citrate-coated AgNPs over a period of 7 d. DNA damage was examined at 3 and 7 d of exposure and 7 and 14 d post-exposure. AgNPs induced 8-oxoG, double strand breaks (DSBs), chromosomal damage, and DNA deletions in both genotypes. However, 8-oxoG was induced earlier in Ogg1-deficient mice and 8-oxoG levels were higher after 7-d treatment and persisted longer after exposure termination. AgNPs downregulated DNA glycosylases Ogg1, Neil1, and Neil2 in wild type mice, but upregulated Myh, Neil1, and Neil2 glycosylases in Ogg1-deficient mice. Neil1 and Neil2 can repair 8-oxoG. Thus, AgNP-mediated downregulation of DNA glycosylases in wild type mice may contribute to genotoxicity, while upregulation thereof in Ogg1-deficient mice could serve as an adaptive response to AgNP-induced DNA damage. However, our data show that Ogg1 is indispensable for the efficient repair of AgNP-induced damage. In summary, citrate-coated AgNPs are genotoxic in both genotypes and Ogg1 deficiency exacerbates the effect. These data suggest that humans with genetic polymorphisms and mutations in OGG1 may have increased susceptibility to AgNP-mediated DNA damage.
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Affiliation(s)
- Sameera Nallanthighal
- a Cancer Research Center , University at Albany, State University of New York , Rensselaer , NY , USA.,b Department of Biomedical Sciences , University at Albany, State University of New York , Albany , NY , USA
| | - Cadia Chan
- a Cancer Research Center , University at Albany, State University of New York , Rensselaer , NY , USA.,c Department of Biomedical Sciences , Queen's University , Kingston , ON , Canada
| | - Thomas M Murray
- d Colleges of Nanoscale Sciences and Engineering , SUNY Polytechnic Institute , Albany , NY , USA
| | - Aaron P Mosier
- d Colleges of Nanoscale Sciences and Engineering , SUNY Polytechnic Institute , Albany , NY , USA
| | - Nathaniel C Cady
- d Colleges of Nanoscale Sciences and Engineering , SUNY Polytechnic Institute , Albany , NY , USA
| | - Ramune Reliene
- a Cancer Research Center , University at Albany, State University of New York , Rensselaer , NY , USA.,e Department of Environmental Health Sciences , University at Albany, State University of New York , Albany , NY , USA
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Martins ADC, Azevedo LF, de Souza Rocha CC, Carneiro MFH, Venancio VP, de Almeida MR, Antunes LMG, de Carvalho Hott R, Rodrigues JL, Ogunjimi AT, Adeyemi JA, Barbosa F. Evaluation of distribution, redox parameters, and genotoxicity in Wistar rats co-exposed to silver and titanium dioxide nanoparticles. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2017; 80:1156-1165. [PMID: 28891756 DOI: 10.1080/15287394.2017.1357376] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The increasing production of silver nanoparticles (AgNPs) and titanium dioxide nanoparticles (TiO2NPs) has resulted in their elevated concentrations in the environment. This study was, therefore, aimed at determining the distribution, redox parameters, and genotoxic effects in male Wistar rats that were treated with either AgNP or TiO2NP individually, as well as under a co-exposure scenario. Animals were exposed via oral gavage to either sodium citrate buffer (vehicle), 0.5 mg/kg/day TiO2NP, 0.5 mg/kg/day AgNP or a mixture of TiO2NPs and AgNPs. Exposure lasted 45 days after which rats were sacrificed, and tissue biodistribution of Ag and Ti measured. The blood concentration of glutathione (GSH) and activities of glutathione peroxidase (GPx) and catalase (CAT) were determined while the genotoxicity was analyzed using the comet assay in peripheral blood and liver cells. The tissue concentrations of Ag followed the order; blood > liver > kidneys while for Ti the order was kidneys > liver > blood. There was no significant change in the measured redox parameters in animals that were exposed to TiO2NPs. However, there was a significant increase in GSH levels accompanied by a reduction in the GPx activity in AgNP-treated and co-exposed groups. The individual or co-exposure to TiO2NP and AgNP did not markedly induce genotoxicity in blood or liver cells. Data showed that TiO2NP did not produce significant oxidative stress or genotoxicity in rats at the dose used in this study while the same dose level of AgNPs resulted in oxidative stress, but no noticeable adverse genotoxic effects.
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Affiliation(s)
- Airton da Cunha Martins
- a Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Departamento de Análises Clínicas, Toxicológicas e Bromatológicas , Universidade de São Paulo , Av. do Café s/n, Bairro Monte Alegre, Ribeirão Preto , São Paulo , Brazil
| | - Lara Ferreira Azevedo
- a Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Departamento de Análises Clínicas, Toxicológicas e Bromatológicas , Universidade de São Paulo , Av. do Café s/n, Bairro Monte Alegre, Ribeirão Preto , São Paulo , Brazil
| | - Cecília Cristina de Souza Rocha
- a Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Departamento de Análises Clínicas, Toxicológicas e Bromatológicas , Universidade de São Paulo , Av. do Café s/n, Bairro Monte Alegre, Ribeirão Preto , São Paulo , Brazil
| | - Maria Fernanda Hornos Carneiro
- a Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Departamento de Análises Clínicas, Toxicológicas e Bromatológicas , Universidade de São Paulo , Av. do Café s/n, Bairro Monte Alegre, Ribeirão Preto , São Paulo , Brazil
| | - Vinicius Paula Venancio
- a Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Departamento de Análises Clínicas, Toxicológicas e Bromatológicas , Universidade de São Paulo , Av. do Café s/n, Bairro Monte Alegre, Ribeirão Preto , São Paulo , Brazil
| | - Mara Ribeiro de Almeida
- a Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Departamento de Análises Clínicas, Toxicológicas e Bromatológicas , Universidade de São Paulo , Av. do Café s/n, Bairro Monte Alegre, Ribeirão Preto , São Paulo , Brazil
| | - Lusânia Maria Greggi Antunes
- a Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Departamento de Análises Clínicas, Toxicológicas e Bromatológicas , Universidade de São Paulo , Av. do Café s/n, Bairro Monte Alegre, Ribeirão Preto , São Paulo , Brazil
| | - Rodrigo de Carvalho Hott
- b Instituto de Ciência, Engenharia e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri , Teófilo Otoni , Minas Gerais , Brazil
| | - Jairo Lisboa Rodrigues
- b Instituto de Ciência, Engenharia e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri , Teófilo Otoni , Minas Gerais , Brazil
| | - Abayomi T Ogunjimi
- a Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Departamento de Análises Clínicas, Toxicológicas e Bromatológicas , Universidade de São Paulo , Av. do Café s/n, Bairro Monte Alegre, Ribeirão Preto , São Paulo , Brazil
- c Department of Pharmaceutics , Obafemi Awolowo University , Ile-Ife , Osun State , Nigeria
| | - Joseph A Adeyemi
- a Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Departamento de Análises Clínicas, Toxicológicas e Bromatológicas , Universidade de São Paulo , Av. do Café s/n, Bairro Monte Alegre, Ribeirão Preto , São Paulo , Brazil
- d Department of Biology, School of Sciences , Federal University of Technology , Akure , Ondo State , Nigeria
| | - Fernando Barbosa
- a Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Departamento de Análises Clínicas, Toxicológicas e Bromatológicas , Universidade de São Paulo , Av. do Café s/n, Bairro Monte Alegre, Ribeirão Preto , São Paulo , Brazil
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Exposure to Engineered Nanomaterials: Impact on DNA Repair Pathways. Int J Mol Sci 2017; 18:ijms18071515. [PMID: 28703770 PMCID: PMC5536005 DOI: 10.3390/ijms18071515] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Revised: 06/30/2017] [Accepted: 07/04/2017] [Indexed: 01/15/2023] Open
Abstract
Some engineered nanomaterials (ENMs) may have the potential to cause damage to the genetic material in living systems. The mechanistic machinery functioning at the cellular/molecular level, in the form of DNA repair processes, has evolved to help circumvent DNA damage caused by exposure to a variety of foreign substances. Recent studies have contributed to our understanding of the various DNA damage repair pathways involved in the processing of DNA damage. However, the vast array of ENMs may present a relatively new challenge to the integrity of the human genome; therefore, the potential hazard posed by some ENMs necessitates the evaluation and understanding of ENM-induced DNA damage repair pathways. This review focuses on recent studies highlighting the differential regulation of DNA repair pathways, in response to a variety of ENMs, and discusses the various factors that dictate aberrant repair processes, including intracellular signalling, spatial interactions and ENM-specific responses.
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Fewtrell L, Majuru B, Hunter PR. A re-assessment of the safety of silver in household water treatment: rapid systematic review of mammalian in vivo genotoxicity studies. Environ Health 2017; 16:66. [PMID: 28633660 PMCID: PMC5477731 DOI: 10.1186/s12940-017-0279-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
BACKGROUND Despite poor evidence of their effectiveness, colloidal silver and silver nanoparticles are increasingly being promoted for treating potentially contaminated drinking water in low income countries. Recently, however, concerns have been raised about the possible genotoxicity of particulate silver. OBJECTIVES The goal of this paper was to review the published mammalian in vivo genotoxicity studies using silver micro and nanoparticles. METHODS SCOPUS and Medline were searched using the following search string: ("DNA damage" OR genotox* OR Cytotox* OR Embryotox*) AND (silver OR AgNP). Included papers were any mammalian in vivo experimental studies investigating genotoxicity of silver particles. Studies were quality assessed using the ToxRTool. RESULTS 16 relevant papers were identified. There were substantial variations in study design including the size of silver particles, animal species, target organs, silver dose, route of administration and the method used to detect genotoxicity. Thus, it was not possible to produce a definitive pooled result. Nevertheless, most studies showed evidence of genotoxicity unless using very low doses. We also identified one human study reporting evidence of "severe DNA damage" in silver jewellery workers occupationally exposed to silver particles. CONCLUSIONS With the available evidence it is not possible to be definitive about risks to human health from oral exposure to silver particulates. However, the balance of evidence suggests that there should be concerns especially when considering the evidence from jewellery workers. There is an urgent need to determine whether people exposed to particulate silver as part of drinking water treatment have evidence of DNA damage.
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Affiliation(s)
- Lorna Fewtrell
- Centre for Research into Environment and Health, University of Aberystwyth, Aberystwyth, UK
| | - Batsirai Majuru
- Norwich Medical School, University of East Anglia, Norwich, NR4 7TJ UK
| | - Paul R. Hunter
- Norwich Medical School, University of East Anglia, Norwich, NR4 7TJ UK
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Collins A, El Yamani N, Dusinska M. Sensitive detection of DNA oxidation damage induced by nanomaterials. Free Radic Biol Med 2017; 107:69-76. [PMID: 28161308 DOI: 10.1016/j.freeradbiomed.2017.02.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Revised: 01/02/2017] [Accepted: 02/01/2017] [Indexed: 12/23/2022]
Abstract
From a toxicological point of view, nanomaterials are of interest; because - on account of their great surface area relative to mass - they tend to be more reactive than the bulk chemicals from which they are derived. They might in some cases have the potential to damage DNA directly, or could act via the induction of oxidative stress. The comet assay (single cell gel electrophoresis) is widely used to measure DNA strand breaks and also oxidised bases, by including in the procedure digestion with lesion-specific enzymes such as formamidopyrimidine DNA glycosylase (which converts oxidised purines to breaks) or endonuclease III (recognising oxidised pyrimidines). We summarise reports in which these enzymes have been used to study a variety of nanomaterials in diverse cell types. We also stress that it is important to carry out tests of cell viability alongside the genotoxicity assay, since cytotoxicity can lead to adventitious DNA damage. Different concentrations of nanomaterials should be investigated, concentrating on a non-cytotoxic range; and incubating for short and longer periods can give valuable information about the mode of damage induction. The use of lesion-specific enzymes can substantially enhance the sensitivity of the comet assay in detecting genotoxic effects.
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Affiliation(s)
- Andrew Collins
- University of Oslo, Department of Nutrition, Oslo, Norway; NorGenotech AS, Skreia, Norway.
| | - Naouale El Yamani
- NorGenotech AS, Skreia, Norway; Norwegian Institute for Air Research, Department of Environmental Chemistry, Kjeller, Norway
| | - Maria Dusinska
- Norwegian Institute for Air Research, Department of Environmental Chemistry, Kjeller, Norway
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Morgan AM, Ibrahim MA, Noshy PA. Reproductive toxicity provoked by titanium dioxide nanoparticles and the ameliorative role of Tiron in adult male rats. Biochem Biophys Res Commun 2017; 486:595-600. [PMID: 28336439 DOI: 10.1016/j.bbrc.2017.03.098] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Accepted: 03/19/2017] [Indexed: 01/13/2023]
Abstract
Titanium dioxide nanoparticles (TDN) are widely used in paints, plastics, ceramics, cosmetics, printing ink, rubber and paper. Tiron is a water soluble metal chelator and antioxidant. This study was designed to investigate the reproductive toxicity of TDN in male albino rats and the ameliorative role of Tiron to minimize such toxic effects. Eighty adult male albino rats were assigned into 4 equal groups, group 1: control; group 2: received TDN at 100 mg/kg/day orally for 8 weeks; group 3: received Tiron at 470 mg/kg/day intraperitoneally for 2 weeks (the last 2 weeks of the experimental period); group 4: received both TDN and Tiron by the same previously mentioned dose, route and duration. The results revealed that TDN provoked reproductive toxicity which was proved by the deteriorated spermogram picture, high incidence of micronucleated RBCs, elevated oxidative stress parameters and up regulation of Testin gene. Whereas, Tiron co-treatment ameliorated most of these toxic alterations. Our findings highlighted the protective role of tiron against TDN intoxication.
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Affiliation(s)
- Ashraf M Morgan
- Toxicology and Forensic Medicine Department, Faculty of Veterinary Medicine, Cairo University, Egypt
| | - Marwa A Ibrahim
- Biochemistry Department, Faculty of Veterinary Medicine, Cairo University, Egypt.
| | - Peter A Noshy
- Toxicology and Forensic Medicine Department, Faculty of Veterinary Medicine, Cairo University, Egypt
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