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Perrigue PM, Murray RA, Mielcarek A, Henschke A, Moya SE. Degradation of Drug Delivery Nanocarriers and Payload Release: A Review of Physical Methods for Tracing Nanocarrier Biological Fate. Pharmaceutics 2021; 13:770. [PMID: 34064155 PMCID: PMC8224277 DOI: 10.3390/pharmaceutics13060770] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 05/11/2021] [Accepted: 05/12/2021] [Indexed: 12/13/2022] Open
Abstract
Nanoformulations offer multiple advantages over conventional drug delivery, enhancing solubility, biocompatibility, and bioavailability of drugs. Nanocarriers can be engineered with targeting ligands for reaching specific tissue or cells, thus reducing the side effects of payloads. Following systemic delivery, nanocarriers must deliver encapsulated drugs, usually through nanocarrier degradation. A premature degradation, or the loss of the nanocarrier coating, may prevent the drug's delivery to the targeted tissue. Despite their importance, stability and degradation of nanocarriers in biological environments are largely not studied in the literature. Here we review techniques for tracing the fate of nanocarriers, focusing on nanocarrier degradation and drug release both intracellularly and in vivo. Intracellularly, we will discuss different fluorescence techniques: confocal laser scanning microscopy, fluorescence correlation spectroscopy, lifetime imaging, flow cytometry, etc. We also consider confocal Raman microscopy as a label-free technique to trace colocalization of nanocarriers and drugs. In vivo we will consider fluorescence and nuclear imaging for tracing nanocarriers. Positron emission tomography and single-photon emission computed tomography are used for a quantitative assessment of nanocarrier and payload biodistribution. Strategies for dual radiolabelling of the nanocarriers and the payload for tracing carrier degradation, as well as the efficacy of the payload delivery in vivo, are also discussed.
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Affiliation(s)
- Patrick M. Perrigue
- NanoBioMedical Centre, Adam Mickiewicz University, Wszechnicy Piastowskiej 3, 61-614 Poznan, Poland; (P.M.P.); (A.M.); (A.H.)
| | - Richard A. Murray
- Instituto Biofisika (UPV/EHU, CSIC), Barrio Sarriena S/N, 48940 Leioa, Spain;
| | - Angelika Mielcarek
- NanoBioMedical Centre, Adam Mickiewicz University, Wszechnicy Piastowskiej 3, 61-614 Poznan, Poland; (P.M.P.); (A.M.); (A.H.)
| | - Agata Henschke
- NanoBioMedical Centre, Adam Mickiewicz University, Wszechnicy Piastowskiej 3, 61-614 Poznan, Poland; (P.M.P.); (A.M.); (A.H.)
| | - Sergio E. Moya
- NanoBioMedical Centre, Adam Mickiewicz University, Wszechnicy Piastowskiej 3, 61-614 Poznan, Poland; (P.M.P.); (A.M.); (A.H.)
- Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), Paseo de Miramon 182, 20014 Donostia San Sebastián, Spain
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Saydé T, El Hamoui O, Alies B, Gaudin K, Lespes G, Battu S. Biomaterials for Three-Dimensional Cell Culture: From Applications in Oncology to Nanotechnology. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:481. [PMID: 33668665 PMCID: PMC7917665 DOI: 10.3390/nano11020481] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 02/08/2021] [Accepted: 02/09/2021] [Indexed: 02/07/2023]
Abstract
Three-dimensional cell culture has revolutionized cellular biology research and opened the door to novel discoveries in terms of cellular behavior and response to microenvironment stimuli. Different types of 3D culture exist today, including hydrogel scaffold-based models, which possess a complex structure mimicking the extracellular matrix. These hydrogels can be made of polymers (natural or synthetic) or low-molecular weight gelators that, via the supramolecular assembly of molecules, allow the production of a reproducible hydrogel with tunable mechanical properties. When cancer cells are grown in this type of hydrogel, they develop into multicellular tumor spheroids (MCTS). Three-dimensional (3D) cancer culture combined with a complex microenvironment that consists of a platform to study tumor development and also to assess the toxicity of physico-chemical entities such as ions, molecules or particles. With the emergence of nanoparticles of different origins and natures, implementing a reproducible in vitro model that consists of a bio-indicator for nano-toxicity assays is inevitable. However, the maneuver process of such a bio-indicator requires the implementation of a repeatable system that undergoes an exhaustive follow-up. Hence, the biggest challenge in this matter is the reproducibility of the MCTS and the associated full-scale characterization of this system's components.
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Affiliation(s)
- Tarek Saydé
- EA3842-CAPTuR, GEIST, Faculté de Médecine, Université de Limoges, 2 rue du Dr Marcland, 87025 Limoges, France;
- ARNA, INSERM U1212, UMR CNRS 5320, Université de Bordeaux, 146 rue Léo Saignat, 33076 Bordeaux, France; (O.E.H.); (B.A.); (K.G.)
| | - Omar El Hamoui
- ARNA, INSERM U1212, UMR CNRS 5320, Université de Bordeaux, 146 rue Léo Saignat, 33076 Bordeaux, France; (O.E.H.); (B.A.); (K.G.)
- CNRS, Institut des Sciences Analytiques et de Physico-Chimie pour l’Environnement et les Matériaux (IPREM), UMR 5254, Université de Pau et des Pays de l’Adour (E2S/UPPA), 2 Avenue Pierre Angot, 64053 Pau, France
| | - Bruno Alies
- ARNA, INSERM U1212, UMR CNRS 5320, Université de Bordeaux, 146 rue Léo Saignat, 33076 Bordeaux, France; (O.E.H.); (B.A.); (K.G.)
| | - Karen Gaudin
- ARNA, INSERM U1212, UMR CNRS 5320, Université de Bordeaux, 146 rue Léo Saignat, 33076 Bordeaux, France; (O.E.H.); (B.A.); (K.G.)
| | - Gaëtane Lespes
- CNRS, Institut des Sciences Analytiques et de Physico-Chimie pour l’Environnement et les Matériaux (IPREM), UMR 5254, Université de Pau et des Pays de l’Adour (E2S/UPPA), 2 Avenue Pierre Angot, 64053 Pau, France
| | - Serge Battu
- EA3842-CAPTuR, GEIST, Faculté de Médecine, Université de Limoges, 2 rue du Dr Marcland, 87025 Limoges, France;
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Tangeretin-Assisted Platinum Nanoparticles Enhance the Apoptotic Properties of Doxorubicin: Combination Therapy for Osteosarcoma Treatment. NANOMATERIALS 2019; 9:nano9081089. [PMID: 31362420 PMCID: PMC6723885 DOI: 10.3390/nano9081089] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 07/25/2019] [Accepted: 07/28/2019] [Indexed: 12/12/2022]
Abstract
Osteosarcoma (OS) is the most common type of cancer and the most frequent malignant bone tumor in childhood and adolescence. Nanomedicine has become an indispensable field in biomedical and clinical research, with nanoparticles (NPs) promising to increase the therapeutic efficacy of anticancer drugs. Doxorubicin (DOX) is a commonly used chemotherapeutic drug against OS; however, it causes severe side effects that restrict its clinical applications. Here, we investigated whether combining platinum NPs (PtNPs) and DOX could increase their anticancer activity in human bone OS epithelial cells (U2OS). PtNPs with nontoxic, effective, thermally stable, and thermoplasmonic properties were synthesized and characterized using tangeretin. We examined the combined effects of PtNPs and DOX on cell viability, proliferation, and morphology, reactive oxygen species (ROS) generation, lipid peroxidation, nitric oxide, protein carbonyl content, antioxidants, mitochondrial membrane potential (MMP), adenosine tri phosphate (ATP) level, apoptotic and antiapoptotic gene expression, oxidative stress-induced DNA damage, and DNA repair genes. PtNPs and DOX significantly inhibited U2OS viability and proliferation in a dose-dependent manner, increasing lactate dehydrogenase leakage, ROS generation, and malondialdehyde, nitric oxide, and carbonylated protein levels. Mitochondrial dysfunction was confirmed by reduced MMP, decreased ATP levels, and upregulated apoptotic/downregulated antiapoptotic gene expression. Oxidative stress was a major cause of cytotoxicity and genotoxicity, confirmed by decreased levels of various antioxidants. Furthermore, PtNPs and DOX increased 8-oxo-dG and 8-oxo-G levels and induced DNA damage and repair gene expression. Combination of cisplatin and DOX potentially induce apoptosis comparable to PtNPs and DOX. To the best of our knowledge, this is the first report to describe the combined effects of PtNPs and DOX in OS.
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Abad Tan S, Zoidl G, Ghafar-Zadeh E. A Multidisciplinary Approach Toward High Throughput Label-Free Cytotoxicity Monitoring of Superparamagnetic Iron Oxide Nanoparticles. Bioengineering (Basel) 2019; 6:E52. [PMID: 31185664 PMCID: PMC6631604 DOI: 10.3390/bioengineering6020052] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 05/24/2019] [Accepted: 06/05/2019] [Indexed: 12/12/2022] Open
Abstract
Abstract: This paper focuses on cytotoxicity examination of superparamagnetic iron oxide nanoparticles (SPIONs) using different methods, including impedance spectroscopy. Recent advances of SPIONs for clinical and research applications have triggered the need to understand their effects in cells. Despite the great advances in adapting various biological and chemical methods to assess in-vitro toxicity of SPIONs, less attention has been paid on the development of a high throughput label-free screening platform to study the interaction between the cells and nanoparticles including SPIONs. In this paper, we have taken the first step toward this goal by proposing a label-free impedimetric method for monitoring living cells treated with SPIONs. We demonstrate the effect of SPIONs on the adhesion, growth, proliferation, and viability of neuroblastoma 2A (N2a) cells using impedance spectroscopy as a label-free method, along with other standard microscopic and cell viability testing methods as control methods. Our results have shown a decreased viability of the cells as the concentration of SPIONs increases with percentages of 59%, 47%, and 40% for 100 µg/mL (C4), 200 µg/mL (C5), 300 µg/mL (C6), respectively. Although all SPIONs concentrations have allowed the growth of cells within 72 hours, C4, C5, and C6 showed slower growth compared to the control (C1). The growth and proliferation of N2a cells are faster in the absence or low concentration of SPIONS. The percent coefficient of variation (% CV) was used to compare cell concentrations obtained by TBDE assay and a Scepter cell counter. Results also showed that the lower the SPIONs concentration, the lower the impedance is expected to be in the sensing electrodes without the cells. Meanwhile, the variation of surface area (∆S) was affected by the concentration of SPIONs. It was observed that the double layer capacitance was almost constant because of the higher attachment of cells, the lower surface area coated by SPIONs. In conclusion, impedance changes of electrodes exposed to the mixture of cells and SPIONs offer a wide dynamic range (>1 MΩ using Electric Cell-substrate Impedance electrodes) suitable for cytotoxicity studies. Based on impedance based, viability testing and microscopic methods' results, SPIONs concentrations higher than 100 ug/mL and 300 ug/mL cause minor and major effects, respectively. We propose that a high throughput impedance-based label-free platform provides great advantages for studying SPIONs in a cell-based context, opening a window of opportunity to design and test the next generation of SPIONs with reduced toxicity for biomedical or medical applications.
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Affiliation(s)
- Sonia Abad Tan
- Biologically Inspired Sensors and Actuators Laboratory, Lassonde School of Engineering, York University, Ontario, Toronto M3J 1P3, Canada.
- Department of Biology, York University, Ontario, Toronto M3J 1P3, Canada.
| | - Georg Zoidl
- Department of Biology, York University, Ontario, Toronto M3J 1P3, Canada.
- Department of Psychology, York University, Ontario, Toronto M3J 1P3, Canada.
| | - Ebrahim Ghafar-Zadeh
- Biologically Inspired Sensors and Actuators Laboratory, Lassonde School of Engineering, York University, Ontario, Toronto M3J 1P3, Canada.
- Department of Biology, York University, Ontario, Toronto M3J 1P3, Canada.
- Department of Electrical Engineering and Computer Science, York University, Ontario, Toronto M3J 1P3, Canada.
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Gurunathan S, Jeyaraj M, Kang MH, Kim JH. The Effects of Apigenin-Biosynthesized Ultra-Small Platinum Nanoparticles on the Human Monocytic THP-1 Cell Line. Cells 2019; 8:E444. [PMID: 31083475 PMCID: PMC6562931 DOI: 10.3390/cells8050444] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 05/06/2019] [Accepted: 05/08/2019] [Indexed: 12/22/2022] Open
Abstract
Generally, platinum nanoparticles (PtNPs) are considered non-toxic; however, toxicity depends on the size, dose, and physico-chemical properties of materials. Owing to unique physico-chemical properties, PtNPs have emerged as a material of interest for several biomedical applications, particularly therapeutics. The adverse effect of PtNPs on the human monocytic cell line (THP-1) is not well-established and remains elusive. Exposure to PtNPs may trigger oxidative stress and eventually lead to inflammation. To further understand the toxicological properties of PtNPs, we studied the effect of biologically synthesized ultra-small PtNPs on cytotoxicity, genotoxicity, and proinflammatory responses in the human monocytic cell line (THP-1). Our observations clearly indicated that PtNPs induce cytotoxicity in a dose-dependent manner by reducing cell viability and proliferation. The cytotoxicity of THP-1 cells correlated with an increase in the leakage of lactate dehydrogenase, generation of reactive oxygen species, and production of malondialdehyde, nitric oxide, and carbonylated proteins. The involvement of mitochondria in cytotoxicity and genotoxicity was confirmed by loss of mitochondrial membrane potential, lower ATP level, and upregulation of proapoptotic and downregulation of antiapoptotic genes. Decreases in the levels of antioxidants such as reduced glutathione (GSH), oxidized glutathione (GSH: GSSG), glutathione peroxidase (GPx), superoxide dismutase (SOD), catalase (CAT), and thioredoxin (TRX) were indicative of oxidative stress. Apoptosis was confirmed with the significant upregulation of key apoptosis-regulating genes. Oxidative DNA damage was confirmed by the increase in the levels of 8-oxodG and 8-oxoG and upregulation of DNA damage and repair genes. Finally, the proinflammatory responses to PtNPs was determined by assessing the levels of multiple cytokines such as interleukin-1β (IL-1β), IL-6, IL-8, tumor necrosis factor-α (TNF-α), granulocyte-macrophage colony-stimulating factor (GM-CSF), and monocyte chemoattractant protein 1 (MCP-1). All the cytokines were significantly upregulated in a dose-dependent manner. Collectively, these observations suggest that THP-1 cells were vulnerable to biologically synthesized ultra-small PtNPs.
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Affiliation(s)
- Sangiliyandi Gurunathan
- Department of Stem Cell and Regenerative Biotechnology, Konkuk University, Seoul -05029, Korea.
| | - Muniyandi Jeyaraj
- Department of Stem Cell and Regenerative Biotechnology, Konkuk University, Seoul -05029, Korea.
| | - Min-Hee Kang
- Department of Stem Cell and Regenerative Biotechnology, Konkuk University, Seoul -05029, Korea.
| | - Jin-Hoi Kim
- Department of Stem Cell and Regenerative Biotechnology, Konkuk University, Seoul -05029, Korea.
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Pastrana HF, Cooper CL, Alucozai M, Reece LM, Avila AG, Allain JP. Synthesis and in vitro
safety assessment of magnetic bacterial cellulose with porcine aortic smooth muscle cells. J Biomed Mater Res A 2016; 104:2801-9. [PMID: 27376695 DOI: 10.1002/jbm.a.35824] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Revised: 06/09/2016] [Accepted: 06/30/2016] [Indexed: 12/27/2022]
Affiliation(s)
- Homero F. Pastrana
- Department of Electric and Electronic Engineering and Centro de Microelectrónica (CMUA); Universidad de los Andes; Bogotá D.C. 11001 Colombia
- Department of Electrical Computer Engineering, Birck Nanotechnology Center, Purdue University; West Lafayette IN
| | - Christy L. Cooper
- Department of Electrical Computer Engineering, Birck Nanotechnology Center, Purdue University; West Lafayette IN
- Department of Basic Medical Sciences; College of Veterinary Medicine, Purdue University; West Lafayette IN
| | - Milad Alucozai
- Department of Electrical Computer Engineering, Birck Nanotechnology Center, Purdue University; West Lafayette IN
- College of Health and Human Sciences; Purdue University; West Lafayette IN
| | - Lisa M. Reece
- Department of Electrical Computer Engineering, Birck Nanotechnology Center, Purdue University; West Lafayette IN
- Department of Basic Medical Sciences; College of Veterinary Medicine, Purdue University; West Lafayette IN
| | - Alba G. Avila
- Department of Electric and Electronic Engineering and Centro de Microelectrónica (CMUA); Universidad de los Andes; Bogotá D.C. 11001 Colombia
| | - Jean Paul Allain
- Department of Nuclear, Plasma, and Radiological Engineering; University of Illinois at Urbana-Champaign; Urbana IL
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Shah P, Zhu X, Zhang X, He J, Li CZ. Microelectromechanical System-Based Sensing Arrays for Comparative in Vitro Nanotoxicity Assessment at Single Cell and Small Cell-Population Using Electrochemical Impedance Spectroscopy. ACS APPLIED MATERIALS & INTERFACES 2016; 8:5804-12. [PMID: 26860350 DOI: 10.1021/acsami.5b11409] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The traditional in vitro nanotoxicity assessment approaches are conducted on a monolayer of cell culture. However, to study a cell response without interference from the neighbor cells, a single cell study is necessary; especially in cases of neuronal, cancerous, and stem cells, wherein an individual cell's fate is often not explained by the whole cell population. Nonetheless, a single cell does not mimic the actual in vivo environment and lacks important information regarding cell communication with its microenvironment. Both a single cell and a cell population provide important and complementary information about cells' behaviors. In this research, we explored nanotoxicity assessment on a single cell and a small cell population using electrochemical impedance spectroscopy and a microelectromechanical system (MEMS) device. We demonstrated a controlled capture of PC12 cells in different-sized microwells (to capture a different number of cells) using a combined method of surface functionalization and dielectrophoresis. The present approach provides a rapid nanotoxicity response as compared to other conventional approaches. This is the first study, to our knowledge, which demonstrates a comparative response of a single cell and small cell colonies on the same MEMS platform, when exposed to metaloxide nanoparticles. We demonstrated that the microenvironment of a cell is also accountable for cells' behaviors and their responses to nanomaterials. The results of this experimental study open up a new hypothesis to be tested for identifying the role of cell communication in spreading toxicity in a cell population.
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Affiliation(s)
- Pratikkumar Shah
- Nanobioengineering/Bioelectronics Laboratory, Department of Biomedical Engineering, Florida International University , 10555 West Flagler Street, Miami, Florida 33174, United States
| | - Xuena Zhu
- Nanobioengineering/Bioelectronics Laboratory, Department of Biomedical Engineering, Florida International University , 10555 West Flagler Street, Miami, Florida 33174, United States
| | - Xueji Zhang
- Research Center for Bioengineering and Sensing Technology, University of Science and Technology Beijing, 100083, P. R. China
| | - Jin He
- Department of Physics, Florida International University , Miami, Florida 33199, United States
| | - Chen-zhong Li
- Nanobioengineering/Bioelectronics Laboratory, Department of Biomedical Engineering, Florida International University , 10555 West Flagler Street, Miami, Florida 33174, United States
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Eustaquio T, Leary JF. Nanobarcoded superparamagnetic iron oxide nanoparticles for nanomedicine: Quantitative studies of cell-nanoparticle interactions by scanning image cytometry. Cytometry A 2015; 89:207-16. [DOI: 10.1002/cyto.a.22699] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Revised: 03/07/2015] [Accepted: 05/02/2015] [Indexed: 12/21/2022]
Affiliation(s)
- Trisha Eustaquio
- Weldon School of Biomedical Engineering; Birck Nanotechnology Center, Purdue University; West Lafayette Indiana
| | - James F. Leary
- Weldon School of Biomedical Engineering, Birck Nanotechnology Center, Bindley Bioscience Center, School of Veterinary Medicine, Department of Basic Medical Sciences, Purdue University; West Lafayette Indiana
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Abstract
Nanomaterials, because of their tunable properties and performances, have been utilized extensively in everyday life related consumable products and technology. On exposure, beyond the physiological range, nanomaterials cause health risks via affecting the function of organisms, genomic systems, and even the central nervous system. Thus, new analytical approaches for nanotoxicity assessment to verify the feasibility of nanomaterials for future use are in demand. The conventional analytical techniques, such as spectrophotometric assay-based techniques, usually require a lengthy and time-consuming process and often produce false positives, and often cannot be implemented at a single cell level measurement for studying cell behavior without interference from its surrounding environment. Hence, there is a demand for a precise, accurate, sensitive assessment for toxicity using single cells. Recently, due to the advantages of automation of fluids and minimization of human errors, the integration of a cell-on-a-chip (CoC) with a microfluidic system is in practice for nanotoxicity assessments. This review explains nanotoxicity and its assessment approaches with advantages/limitations and new approaches to overcome the confines of traditional techniques. Recent advances in nanotoxicity assessment using a CoC integrated with a microfluidic system are also discussed in this review, which may be of use for nanotoxicity assessment and diagnostics.
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Affiliation(s)
- Pratikkumar Shah
- Department of Biomedical Engineering, Florida International University, Miami, FL, USA.
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Oxidative DNA damage from nanoparticle exposure and its application to workers' health: a literature review. Saf Health Work 2013; 4:177-86. [PMID: 24422173 PMCID: PMC3889076 DOI: 10.1016/j.shaw.2013.07.006] [Citation(s) in RCA: 82] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Revised: 07/17/2013] [Accepted: 07/26/2013] [Indexed: 12/21/2022] Open
Abstract
The use of nanoparticles (NPs) in industry is increasing, bringing with it a number of adverse health effects on workers. Like other chemical carcinogens, NPs can cause cancer via oxidative DNA damage. Of all the molecules vulnerable to oxidative modification by NPs, DNA has received the greatest attention, and biomarkers of exposure and effect are nearing validation. This review concentrates on studies published between 2000 and 2012 that attempted to detect oxidative DNA damage in humans, laboratory animals, and cell lines. It is important to review these studies to improve the current understanding of the oxidative DNA damage caused by NP exposure in the workplace. In addition to examining studies on oxidative damage, this review briefly describes NPs, giving some examples of their adverse effects, and reviews occupational exposure assessments and approaches to minimizing exposure (e.g., personal protective equipment and engineering controls such as fume hoods). Current recommendations to minimize exposure are largely based on common sense, analogy to ultrafine material toxicity, and general health and safety recommendations.
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