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Collins EMS, Hessel EVS, Hughes S. How neurobehavior and brain development in alternative whole-organism models can contribute to prediction of developmental neurotoxicity. Neurotoxicology 2024; 102:48-57. [PMID: 38552718 PMCID: PMC11139590 DOI: 10.1016/j.neuro.2024.03.005] [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: 12/22/2023] [Revised: 03/01/2024] [Accepted: 03/23/2024] [Indexed: 04/12/2024]
Abstract
Developmental neurotoxicity (DNT) is not routinely evaluated in chemical risk assessment because current test paradigms for DNT require the use of mammalian models which are ethically controversial, expensive, and resource demanding. Consequently, efforts have focused on revolutionizing DNT testing through affordable novel alternative methods for risk assessment. The goal is to develop a DNT in vitro test battery amenable to high-throughput screening (HTS). Currently, the DNT in vitro test battery consists primarily of human cell-based assays because of their immediate relevance to human health. However, such cell-based assays alone are unable to capture the complexity of a developing nervous system. Whole organismal systems that qualify as 3 R (Replace, Reduce and Refine) models are urgently needed to complement cell-based DNT testing. These models can provide the necessary organismal context and be used to explore the impact of chemicals on brain function by linking molecular and/or cellular changes to behavioural readouts. The nematode Caenorhabditis elegans, the planarian Dugesia japonica, and embryos of the zebrafish Danio rerio are all suited to low-cost HTS and each has unique strengths for DNT testing. Here, we review the strengths and the complementarity of these organisms in a novel, integrative context and highlight how they can augment current cell-based assays for more comprehensive and robust DNT screening of chemicals. Considering the limitations of all in vitro test systems, we discuss how a smart combinatory use of these systems will contribute to a better human relevant risk assessment of chemicals that considers the complexity of the developing brain.
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Affiliation(s)
- Eva-Maria S Collins
- Swarthmore College, Biology, 500 College Avenue, Swarthmore, PA 19081, USA; Department of Neuroscience, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA; Center of Excellence in Environmental Toxicology, University of Pennsylvania, Philadelphia, PA, USA.
| | - Ellen V S Hessel
- Centre for Health Protection, National Institute for Public Health and the Environment (RIVM), Antonie van Leeuwenhoeklaan 9, Bilthoven, 3721 MA, the Netherlands
| | - Samantha Hughes
- Department of Environmental Health and Toxicology, A-LIFE, Vrije Universiteit Amsterdam, de Boelelaan 1085, Amsterdam, 1081 HV, the Netherlands.
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2
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Yu Y, Tan S, Xie D, Li H, Chen H, Dang Y, Xiang M. Photoaged microplastics induce neurotoxicity associated with damage to serotonergic, glutamatergic, dopaminergic, and GABAergic neuronal systems in Caenorhabditis elegans. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 900:165874. [PMID: 37517734 DOI: 10.1016/j.scitotenv.2023.165874] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2023] [Revised: 07/05/2023] [Accepted: 07/27/2023] [Indexed: 08/01/2023]
Abstract
Microplastics (MPs) are ubiquitous environmental contaminants that cause neurotoxicity in various organisms. MPs are typically affected by light irradiation and undergo photoaging. However, the neurotoxic effects of photoaged polystyrene (P-PS) and its underlying mechanisms remain unclear. In this study, locomotion behaviors, neuronal development, neurotransmitter levels, and the expression of neurotransmission-related genes were investigated in Caenorhabditis elegans exposed to P-PS at environment-relevant concentrations (0.1-100 μg/L). The characterization results showed that photoaging accelerated the aging process and changed the physicochemical properties of the MPs. The toxicity results suggested that exposure to 1-100 μg/L P-PS caused more severe neurotoxicity than virgin polystyrene (V-PS) with endpoints of head thrashes, body bends, wavelength, and mean amplitude. Exposure to P-PS also altered the fluorescence intensity and neurodegeneration percentage of serotonergic, glutamatergic, dopaminergic, and aminobutyric acid (GABA) in transgenic nematodes. Similarly, significant reductions in the levels of these neurotransmitters were also observed. Based on Pearson's correlation, locomotion behaviors were negatively correlated with the neurotransmission of serotonin, glutamate, dopamine, and GABA. Further investigation suggested that the expression of neurotransmitter-related genes (e.g., tph-1, eat-4, and unc-46) was significantly altered in the nematodes. Collectively, the neurotoxic effects of P-PS were attributed to abnormal neurotransmission. This study highlights the potential toxicity of MPs photoaged under environmentally relevant conditions.
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Affiliation(s)
- Yunjiang Yu
- State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, China.
| | - Shihui Tan
- State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, China; School of Public Health, China Medical University, Liaoning 110122, China
| | - Dongli Xie
- State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, China; College of Environmental and Chemical Engineering, Chongqing Three Gorges University, Wanzhou 404100, China
| | - Hongyan Li
- State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, China
| | - Haibo Chen
- Institute for Environmental Pollution and Health, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, PR China.
| | - Yao Dang
- State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, China
| | - Mingdeng Xiang
- State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, China
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3
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Hu C, Yang W. Alternatives to animal models to study bacterial infections. Folia Microbiol (Praha) 2023; 68:703-739. [PMID: 37632640 DOI: 10.1007/s12223-023-01084-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Accepted: 08/02/2023] [Indexed: 08/28/2023]
Abstract
Animal testing has made a significant and unequalled contribution to important discoveries and advancements in the fields of research, medicine, vaccine development, and drug discovery. Each year, millions of animals are sacrificed for various experiments, and this is an ongoing process. However, the debate on the ethical and sensible usage of animals in in vivo experimentation is equally important. The need to explore and adopt newer alternatives to animals so as to comply with the goal of reduce, refine, and replace needs attention. Besides the ever-increasing debate on ethical issues, animal research has additional drawbacks (need of trained labour, requirement of breeding area, lengthy protocols, high expenses, transport barriers, difficulty to extrapolate data from animals to humans, etc.). With this scenario, the present review has been framed to give a comprehensive insight into the possible alternative options worth exploring in this direction especially targeting replacements for animal models of bacterial infections. There have been some excellent reviews discussing on the alternate methods for replacing and reducing animals in drug research. However, reviews that discuss the replacements in the field of medical bacteriology with emphasis on animal bacterial infection models are purely limited. The present review discusses on the use of (a) non-mammalian models and (b) alternative systems such as microfluidic chip-based models and microdosing aiming to give a detailed insight into the prospects of these alternative platforms to reduce the number of animals being used in infection studies. This would enlighten the scientific community working in this direction to be well acquainted with the available new approaches and alternatives so that the 3R strategy can be successfully implemented in the field of antibacterial drug research and testing.
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Affiliation(s)
- Chengming Hu
- Queen Mary College, Nanchang University, Nanchang, China
| | - Wenlong Yang
- Department of Infectious Diseases, The Second Affiliated Hospital of Nanchang University, Nanchang, 330006, China.
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4
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Metal cations toxicity: An inorganic interpretation. J INDIAN CHEM SOC 2023. [DOI: 10.1016/j.jics.2022.100840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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5
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Li N, Wen L, Wang F, Wang T, Li T, Qiao M, Song L, Bukyei E, Huang X. Mechanism of mitigating effect of wheat germ peptides on lead-induced oxidative damage in PC12 cells. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 246:114190. [PMID: 36252511 DOI: 10.1016/j.ecoenv.2022.114190] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 09/28/2022] [Accepted: 10/11/2022] [Indexed: 06/16/2023]
Abstract
It is well known that lead-induced neurotoxicity is closely related to oxidative stress. According to previous reports, wheat germ peptides (WGPs) isolated from wheat germ have been shown to have potent antioxidant capacity. This study hypothesized that WGPs could protect PC12 cells from lead-induced oxidative stress. Here, the protecting-efficacies of WGPs were investigated in PC12 cells that were pretreated with WGPs (200 μM, 4 h) and exposed to lead (10 μM, 24 h). The antioxidant capacity was assessed by cell viability, ROS, MDA, SOD, CAT, GR, GPx, GSH, and GSSG. The experimental results showed that WGP3, WGP8, and WGP9 could reverse the reduction of cell viability caused by lead exposure. Lead exposure causes oxidative stress by increasing the levels of ROS and MDA. Moreover, the decrease in the levels of SOD, CAT, GPx, GR, and GSH/GSSG could be observed. However, WGP3, WGP8, and WGP9 can protect PC12 cells against lead-induced oxidative stress by reversing these phenomena. The protein expression of TXNIP, Keap1, and Nrf2 was characterized by western blotting, and the results illustrated that lead exposure up-regulated the expression of TXNIP and Keap1 and down-regulated the expression of Nrf2, and WGP3, WGP8, and WGP9 could improve the antioxidant capacity of PC12 cells by reversing this phenomenon. Therefore, the present study demonstrated that WGP3, WGP8, and WGP9 may protect against lead-induced oxidative stress in PC12 cells by regulating the TXNIP/Keap1/Nrf2 pathway.
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Affiliation(s)
- Ning Li
- Henan Engineering Technology Research Center of Food Processing and Circulation Safety Control, College of Food Science and Technology, Henan Agricultural University, 63# Agricultural Road, 450000 Zhengzhou, China.
| | - Liuding Wen
- Henan Engineering Technology Research Center of Food Processing and Circulation Safety Control, College of Food Science and Technology, Henan Agricultural University, 63# Agricultural Road, 450000 Zhengzhou, China
| | - Fangyu Wang
- Key Laboratory for Animal Immunology, Henan Academy of Agricultural Sciences, 116# Huayuan Road, 450002 Zhengzhou, China
| | - Tianlin Wang
- Henan Engineering Technology Research Center of Food Processing and Circulation Safety Control, College of Food Science and Technology, Henan Agricultural University, 63# Agricultural Road, 450000 Zhengzhou, China
| | - Tiange Li
- Henan Engineering Technology Research Center of Food Processing and Circulation Safety Control, College of Food Science and Technology, Henan Agricultural University, 63# Agricultural Road, 450000 Zhengzhou, China
| | - Mingwu Qiao
- Henan Engineering Technology Research Center of Food Processing and Circulation Safety Control, College of Food Science and Technology, Henan Agricultural University, 63# Agricultural Road, 450000 Zhengzhou, China
| | - Lianjun Song
- Henan Engineering Technology Research Center of Food Processing and Circulation Safety Control, College of Food Science and Technology, Henan Agricultural University, 63# Agricultural Road, 450000 Zhengzhou, China
| | - Erkigul Bukyei
- Department for Food Engineering and Hydromechanics, School of Engineering and Technology, Mongolian State University of Life Sciences, Zaisan-53, Ulaanbaatar 17024, Mongolia
| | - Xianqing Huang
- Henan Engineering Technology Research Center of Food Processing and Circulation Safety Control, College of Food Science and Technology, Henan Agricultural University, 63# Agricultural Road, 450000 Zhengzhou, China.
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Zhang W, Zhang N, Zheng S, Zhang W, Liu J, He L, Ezemaduka AN, Li G, Ning J, Xian B, Gao S. Effects of commercial beverages on the neurobehavioral motility of Caenorhabditis elegans. PeerJ 2022; 10:e13563. [PMID: 35855427 PMCID: PMC9288823 DOI: 10.7717/peerj.13563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Accepted: 05/19/2022] [Indexed: 01/17/2023] Open
Abstract
To study the effects of different types of commercially available drinks/beverages on neurobehavior using the model organism C. elegans, and critically review their potential health hazards. Eighteen kinds of beverages from the supermarket were randomly selected and grouped into seven categories namely functional beverage, tea beverage, plant protein beverage, fruit juice beverage, dairy beverage, carbonated beverage and coffee beverage. The pH value, specific gravity and osmotic pressure were also examined. The L4 stage N2 worms were exposed to different concentration of tested beverages (0, 62.5, 125, 250 and 500 µL/mL) for 24 h to measure the survival rate and locomotory behavior such as head thrashing, body bending as well as pharyngeal pumping. All the 18 beverages tested did not induce any visible lethal effects in the nematodes. However, exposure to different types of tested beverages exhibited different effects on the behavioral ability of C. elegans: (1) sports functional beverage and herbal tea drink accelerated the head thrashing and body bending of nematodes when compared to the control group (P < 0.05). (2) The vibration frequency of the pharyngeal pump of nematodes was significantly accelerated after treated with three plant protein beverages (almond milk, coconut milk and milk tea) and dairy products A and B (P < 0.05), and decelerated after treatment with other tested beverages. (3) Carbonated beverage significantly inhibits the head thrashing, body bending and pharyngeal pumping vibration (P < 0.05). Our results indicate that 18 kinds of popular beverages in the market have different influence on the neurobehavior in C. elegans, which may be related to their different components or properties. Further research would be required to conduct a systematic analysis of the effect of beverages by appropriate kinds, taking into consideration other endpoints such as reproduction, lifespan and molecular stress response, etc., and to elucidate the mechanism for its potential health hazards.
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Affiliation(s)
- Wenjing Zhang
- Beijing Center for Disease Prevention and Control, Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning, Beijing, China
| | - Nan Zhang
- Beijing Center for Disease Prevention and Control, Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning, Beijing, China
| | - Shan Zheng
- Beijing Center for Disease Prevention and Control, Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning, Beijing, China
| | - Wei Zhang
- Beijing Center for Disease Prevention and Control, Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning, Beijing, China
| | - Jingjing Liu
- Beijing Center for Disease Prevention and Control, Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning, Beijing, China
| | - Liwei He
- Beijing Center for Disease Prevention and Control, Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning, Beijing, China
| | - Anastasia Ngozi Ezemaduka
- Key Laboratory of Wetland Ecology and Environment, Northeast institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, China
| | - Guojun Li
- Beijing Center for Disease Prevention and Control, Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning, Beijing, China,School of Public Health, Capital Medical University, Beijing, China
| | - Junyu Ning
- Beijing Center for Disease Prevention and Control, Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning, Beijing, China,School of Public Health, Capital Medical University, Beijing, China
| | - Bo Xian
- School of Medicine, University of Electronic Science and Technology of China, Chengdu, China
| | - Shan Gao
- Beijing Center for Disease Prevention and Control, Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning, Beijing, China
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7
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Camacho J, de Conti A, Pogribny IP, Sprando RL, Hunt PR. Assessment of the Effects of Organic vs. Inorganic Arsenic and Mercury in Caenorhabditis elegans. Curr Res Toxicol 2022; 3:100071. [PMID: 35602005 PMCID: PMC9118485 DOI: 10.1016/j.crtox.2022.100071] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2021] [Revised: 03/26/2022] [Accepted: 04/20/2022] [Indexed: 01/03/2023] Open
Abstract
Similar developmental delays and oxidative stress with 20x DMA relative to NaAsO2. Dissimilar gene expression and locomotion with organic vs. inorganic mercury. Dissimilar unfolded protein responses for organic vs. inorganic arsenic and mercury. Across phyla, methylation has opposite effects on arsenic vs. mercury toxicity.
Exposures to mercury and arsenic are known to pose significant threats to human health. Effects specific to organic vs. inorganic forms of these toxic elements are less understood however, especially for organic dimethylarsinic acid (DMA), which has recently been detected in pups of rodent dams orally exposed to inorganic sodium (meta)arsenite (NaAsO2). Caenorhabditis elegans is a small animal alternative toxicity model. To fill data gaps on the effects of DMA relative to NaAsO2, C. elegans were exposed to these two compounds alongside more thoroughly researched inorganic mercury chloride (HgCl2) and organic methylmercury chloride (meHgCl). For timing of developmental milestone acquisition in C. elegans, meHgCl was 2 to 4-fold more toxic than HgCl2, and NaAsO2 was 20-fold more toxic than DMA, ranking the four compounds meHgCl > HgCl2 > NaAsO2 ≫ DMA for developmental toxicity. Methylmercury induced significant decreases in population locomotor activity levels in developing C. elegans. DMA was also associated with developmental hypoactivity, but at >100-fold higher concentrations than meHgCl. Transcriptional alterations in native genes were observed in wild type C. elegans adults exposed to concentrations equitoxic for developmental delay in juveniles. Both forms of arsenic induced genes involved in immune defense and oxidative stress response, while the two mercury species induced proportionally more genes involved in transcriptional regulation. A transgenic bioreporter for activation of conserved proteosome specific unfolded protein response was strongly activated by NaAsO2, but not DMA at tested concentrations. HgCl2 and meHgCl had opposite effects on a bioreporter for unfolded protein response in the endoplasmic reticulum. Presented experiments indicating low toxicity for DMA in C. elegans are consistent with human epidemiologic data correlating higher arsenic methylation capacity with resistance to arsenic toxicity. This work contributes to the understanding of the accuracy and fit-for-use categories for C. elegans toxicity screening and its usefulness to prioritize compounds of concern for further testing.
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Affiliation(s)
- Jessica Camacho
- Food and Drug Administration, Center for Food Safety and Applied Nutrition, Office of Applied Research and Safety Assessment, 8301 Muirkirk Road, Laurel, MD 20708, United States
| | - Aline de Conti
- Food and Drug Administration, National Center for Toxicological Research, 3900 NCTR Rd, Jefferson, AR 72079, United States
| | - Igor P. Pogribny
- Food and Drug Administration, National Center for Toxicological Research, 3900 NCTR Rd, Jefferson, AR 72079, United States
| | - Robert L. Sprando
- Food and Drug Administration, Center for Food Safety and Applied Nutrition, Office of Applied Research and Safety Assessment, 8301 Muirkirk Road, Laurel, MD 20708, United States
| | - Piper Reid Hunt
- Food and Drug Administration, Center for Food Safety and Applied Nutrition, Office of Applied Research and Safety Assessment, 8301 Muirkirk Road, Laurel, MD 20708, United States
- Corresponding author.
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8
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Kalia V, Niedzwiecki MM, Bradner JM, Lau FK, Anderson FL, Bucher ML, Manz KE, Schlotter AP, Fuentes ZC, Pennell KD, Picard M, Walker DI, Hu WT, Jones DP, Miller GW. Cross-species metabolomic analysis of tau- and DDT-related toxicity. PNAS NEXUS 2022; 1:pgac050. [PMID: 35707205 PMCID: PMC9186048 DOI: 10.1093/pnasnexus/pgac050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Accepted: 04/28/2022] [Indexed: 01/29/2023]
Abstract
Exposure to the pesticide dichlorodiphenyltrichloroethane (DDT) has been associated with increased risk of Alzheimer's disease (AD), a disease also associated with hyperphosphorylated tau (p-tau) protein aggregation. We investigated whether exposure to DDT can exacerbate tau protein toxicity in Caenorhabditiselegans using a transgenic strain that expresses human tau protein prone to aggregation by measuring changes in size, swim behavior, respiration, lifespan, learning, and metabolism. In addition, we examined the association between cerebrospinal fluid (CSF) p-tau protein-as a marker of postmortem tau burden-and global metabolism in both a human population study and in C. elegans, using the same p-tau transgenic strain. From the human population study, plasma and CSF-derived metabolic features associated with p-tau levels were related to drug, amino acid, fatty acid, and mitochondrial metabolism pathways. A total of five metabolites overlapped between plasma and C. elegans, and four between CSF and C. elegans. DDT exacerbated the inhibitory effect of p-tau protein on growth and basal respiration. In the presence of p-tau protein, DDT induced more curling and was associated with reduced levels of amino acids but increased levels of uric acid and adenosylselenohomocysteine. Our findings in C. elegans indicate that DDT exposure and p-tau aggregation both inhibit mitochondrial function and DDT exposure can exacerbate the mitochondrial inhibitory effects of p-tau aggregation. Further, biological pathways associated with exposure to DDT and p-tau protein appear to be conserved between species.
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Affiliation(s)
- Vrinda Kalia
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY, 10032 USA
| | - Megan M Niedzwiecki
- Department of Environmental Medicine and Public Health, Icahn School of Medicine at Mount Sinai, New York, NY, 10029 USA
| | - Joshua M Bradner
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY, 10032 USA
| | - Fion K Lau
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY, 10032 USA
| | - Faith L Anderson
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY, 10032 USA
| | - Meghan L Bucher
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY, 10032 USA
| | - Katherine E Manz
- School of Engineering, Brown University, Providence, RI, 02912 USA
| | - Alexa Puri Schlotter
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY, 10032 USA
| | - Zoe Coates Fuentes
- Department of Environmental Medicine and Public Health, Icahn School of Medicine at Mount Sinai, New York, NY, 10029 USA
| | - Kurt D Pennell
- School of Engineering, Brown University, Providence, RI, 02912 USA
| | - Martin Picard
- Department of Neurology, Department of Psychiatry, Columbia University Irving Medical Center, New York, NY, 10032 USA
| | - Douglas I Walker
- Department of Environmental Medicine and Public Health, Icahn School of Medicine at Mount Sinai, New York, NY, 10029 USA
| | - William T Hu
- Department of Neurology, Rutgers Biomedical and Health Sciences, New Brunswick, NJ, 08901 USA
| | - Dean P Jones
- Division of Pulmonary, Allergy and Critical Medicine, Department of Medicine, School of Medicine, Emory University, Atlanta, GA, 30322 USA
| | - Gary W Miller
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY, 10032 USA
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9
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Feng X, Long R, Wang L, Liu C, Bai Z, Liu X. A review on heavy metal ions adsorption from water by layered double hydroxide and its composites. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2021.120099] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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10
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Microbial Polymers as Sustainable Agents for Mitigating Health Risks of Plant-Based Endocrine Disruptors in Surface Water. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph181910040. [PMID: 34639339 PMCID: PMC8507969 DOI: 10.3390/ijerph181910040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 08/20/2021] [Accepted: 09/16/2021] [Indexed: 11/16/2022]
Abstract
This study investigated the binding abilities of extracellular polymers produced by an environmentally isolated strain of Enterococcus hirae towards phytoestrogen endocrine disruptors-biochanin A, formonetin, genistein and daidzein. The extracellular biopolymer exhibited notable binding and removal for all four phytoestrogens, with a maximum removal of daidzein (87%) followed by genistein (72%) at a 1-1.5 mg/mL concentration. Adsorption proceeded rapidly at ambient temperature. The adsorption data fitted well with the Langmuir isotherm. Based on the adsorption energy, the biopolymer binding of phytoestrogens was inferred as daidzein > genistein > biochanin A > formononetin. Toxicity of the biopolymer (5-250 µg/mL) evaluated using RAW 264.7 cell lines indicated no significant (p < 0.05) changes in viability. In biopolymer-challenged Caenorhabditis elegans previously exposed to daidzein, complete protection to developmental toxicity, such as reduced egg-laying capacity, egg viability and progeny counts of the worm, was observed. The results of this study offer valuable insights into understanding the potential role of microbial extracellular biopolymers in binding and removal of phytoestrogens with sustainable technological implications in modulating the toxic effect of high levels of endocrine disruptors in the environment.
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11
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Jasmer DP, Rosa BA, Mitreva M. Cell Death and Transcriptional Responses Induced in Larvae of the Nematode Haemonchus contortus by Toxins/Toxicants with Broad Phylogenetic Efficacy. Pharmaceuticals (Basel) 2021; 14:598. [PMID: 34206464 PMCID: PMC8308827 DOI: 10.3390/ph14070598] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 06/18/2021] [Accepted: 06/18/2021] [Indexed: 11/16/2022] Open
Abstract
Establishing methods to investigate treatments that induce cell death in parasitic nematodes will promote experimental approaches to elucidate mechanisms and to identify prospective anthelmintics capable of inducing this outcome. Here, we extended recent progress on a method to monitor cell death and to identify small molecule inhibitors in Ascaris suum to Haemonchus contortus, a phylogenetically distant parasitic nematode of significance for both human and agricultural animal health. We utilized a diverse group of small molecule inhibitors referred to as nematode intestinal toxins/toxicants (NITs) coupled with motility, cytological and cell death assays to resolve gross effects on motility and individual cells and organ systems of two H. contortus larval stages in culture. Early transcriptional response evaluation identified NIT-responsive genes and pathways. The scope of death among cells in larvae varied among NITs but shared patterns with A. suum, despite the approach having some limitations due to characteristics of H. contortus larvae. Gene response patterns varied among NITs tested and provided information on the cell targets and pathways affected. Experimental NIT assays provide tools capable of inducing cell death in larval stages of parasitic nematodes, and can resolve many individual cells and organ systems in which cell death can be induced.
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Affiliation(s)
- Douglas P. Jasmer
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164, USA;
| | - Bruce A. Rosa
- Department of Medicine, Division of Infectious Diseases, Washington University School of Medicine, St. Louis, MO 63110, USA;
| | - Makedonka Mitreva
- Department of Medicine, Division of Infectious Diseases, Washington University School of Medicine, St. Louis, MO 63110, USA;
- Department of Genetics, Washington University School of Medicine, St. Louis, MO 63110, USA
- McDonnell Genome Institute, Washington University School of Medicine, St. Louis, MO 63108, USA
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12
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Yadav J, El Hassani M, Sodhi J, Lauschke VM, Hartman JH, Russell LE. Recent developments in in vitro and in vivo models for improved translation of preclinical pharmacokinetics and pharmacodynamics data. Drug Metab Rev 2021; 53:207-233. [PMID: 33989099 DOI: 10.1080/03602532.2021.1922435] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Improved pharmacokinetics/pharmacodynamics (PK/PD) prediction in the early stages of drug development is essential to inform lead optimization strategies and reduce attrition rates. Recently, there have been significant advancements in the development of new in vitro and in vivo strategies to better characterize pharmacokinetic properties and efficacy of drug leads. Herein, we review advances in experimental and mathematical models for clearance predictions, advancements in developing novel tools to capture slowly metabolized drugs, in vivo model developments to capture human etiology for supporting drug development, limitations and gaps in these efforts, and a perspective on the future in the field.
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Affiliation(s)
- Jaydeep Yadav
- Department of Pharmacokinetics, Pharmacodynamics, and Drug Metabolism, Merck & Co., Inc., Boston, MA, USA
| | | | - Jasleen Sodhi
- Department of Bioengineering and Therapeutic Sciences, Schools of Pharmacy and Medicine, University of California San Francisco, San Francisco, CA, USA
| | - Volker M Lauschke
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Jessica H Hartman
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC, USA
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Pedroso da Fontoura L, Puntel R, Pinton S, Silva de Ávila D, Teixeira da Rocha JB, Onofre de Souza D, Roos DH. A toxicological comparison between two uranium compounds in Artemia salina: Artificial seawater containing CaCO 3. MARINE ENVIRONMENTAL RESEARCH 2021; 163:105221. [PMID: 33341237 DOI: 10.1016/j.marenvres.2020.105221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Revised: 11/18/2020] [Accepted: 11/26/2020] [Indexed: 06/12/2023]
Abstract
Uranium (U) mining is an aquatic environmental concern because most of these harmful compounds are discharged into freshwater, reaching the saline environment as the final destination of this contaminated water. Carbonates are present in ocean waters and are essential for benthic organisms, however they may influence the U-induced toxicity. Thus, the aim of this study was to compare the toxicity of uranium nitrate (UN) and uranium acetate (UA) in Artemia salina (AS), which is one of the leading representatives of the marine biota. The cultures of AS (instar II) maintained in artificial seawater containing CaCO3 were exposed for 24 h to different concentrations of U compounds. The results showed that AS were more sensitive to UN (LC50 ≈ 15 μM) when compared with UA (LC50 ≈ 245 μM) indicating higher toxicity of this U compound. Calculated U speciation indicated that Ca2UO2(CO3)3 and (UO2)2CO3(OH)3- complexes predominated under our experimental conditions. The immobilization/lethality was observed after 9 h of exposure for both U compounds. However, only UN caused a significant decrease (≈40%) in the acetylcholinesterase (AChE) activity when compared with control. In order to observe preliminary toxicity effects, we evaluated oxidative stress parameters, such as catalase (CAT) activity, TBARS formation, radical species (RS) generation and cell membrane injury and/or apoptosis (CMI). In this study, we demonstrate that U compounds caused a significant decrease in CAT activity. Similarly, we also observed that UN increased TBARS levels in AS at concentrations 5 times lower than AU (10 μM and 50 μM, respectively). Furthermore, RS generation and CMI were enhanced only on AS treated with UN. Overall, the effects observed here were remarkably significant in AS exposed to UN when compared with AU. In this study, we showed different profiles of toxicity for both U compounds, contributing significantly to the current and scarce understanding of the aquatic ecotoxicity of this heavy metal.
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Affiliation(s)
- Lara Pedroso da Fontoura
- Universidade Federal do Pampa, Campus Uruguaiana, BR-472 Km 592, ZIP code: 97500-970, RS, Brazil
| | - Robson Puntel
- Universidade Federal do Pampa, Campus Uruguaiana, BR-472 Km 592, ZIP code: 97500-970, RS, Brazil
| | - Simone Pinton
- Universidade Federal do Pampa, Campus Uruguaiana, BR-472 Km 592, ZIP code: 97500-970, RS, Brazil
| | - Daiana Silva de Ávila
- Universidade Federal do Pampa, Campus Uruguaiana, BR-472 Km 592, ZIP code: 97500-970, RS, Brazil
| | - João Batista Teixeira da Rocha
- Universidade Federal de Santa Maria, Departamento de bioquímica e biologia celular/CCNE/UFSM, Laboratório de Bioquímica Toxicológica, Farmacologia e Organocalcogênios, ZIP code: 97105900, Santa Maria, RS, Brazil
| | - Diogo Onofre de Souza
- Universidade Federal do Rio Grande do Sul, Instituto de Ciências Básicas da Saúde, Departamento de Bioquímica. Rua Ramiro Barcelos, 2.600 - Anexo Laboratorio 28 Santana, ZIP code: 90035003, Porto Alegre, RS, Brazil
| | - Daniel Henrique Roos
- Universidade Federal do Pampa, Campus Uruguaiana, BR-472 Km 592, ZIP code: 97500-970, RS, Brazil.
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Acute, reproductive, and developmental toxicity of essential oils assessed with alternative in vitro and in vivo systems. Arch Toxicol 2020; 95:673-691. [PMID: 33159585 PMCID: PMC7870616 DOI: 10.1007/s00204-020-02945-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Accepted: 10/28/2020] [Indexed: 01/04/2023]
Abstract
Essential oils (EOs) have attracted increased interest for different applications such as food preservatives, feed additives and ingredients in cosmetics. Due to their reported variable composition of components, they might be acutely toxic to humans and animals in small amounts. Despite the necessity, rigorous toxicity testing in terms of safety evaluation has not been reported so far, especially using alternatives to animal models. Here, we provide a strategy by use of alternative in vitro (cell cultures) and in vivo (Caenorhabditis elegans, hen’s egg test) approaches for detailed investigation of the impact of commonly used rosemary, citrus and eucalyptus essential oil on acute, developmental and reproductive toxicity as well as on mucous membrane irritation. In general, all EOs under study exhibited a comparable impact on measured parameters, with a slightly increased toxic potential of rosemary oil. In vitro cell culture results indicated a concentration-dependent decrease of cell viability for all EOs, with mean IC50 values ranging from 0.08 to 0.17% [v/v]. Similar results were obtained for the C. elegans model when using a sensitized bus-5 mutant strain, with a mean LC50 value of 0.42% [v/v]. In wild-type nematodes, approximately tenfold higher LC50 values were detected. C. elegans development and reproduction was already significantly inhibited at concentrations of 0.5% (wild-type) and 0.1% (bus-5) [v/v] of EO, respectively. Gene expression analysis revealed a significant upregulation of xenobiotic and oxidative stress genes such as cyp-14a3, gst-4, gpx-6 and sod-3. Furthermore, all three EOs under study showed an increased short-time mucous membrane irritation potential, already at 0.5% [v/v] of EO. Finally, GC–MS analysis was performed to quantitate the relative concentration of the most prominent EO compounds. In conclusion, our results demonstrate that EOs can exhibit severe toxic properties, already at low concentrations. Therefore, a detailed toxicological assessment is highly recommended for each EO and single intended application.
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15
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Jasmer DP, Rosa BA, Tyagi R, Mitreva M. Rapid determination of nematode cell and organ susceptibility to toxic treatments. INTERNATIONAL JOURNAL FOR PARASITOLOGY-DRUGS AND DRUG RESISTANCE 2020; 14:167-182. [PMID: 33125935 PMCID: PMC7593349 DOI: 10.1016/j.ijpddr.2020.10.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 10/16/2020] [Accepted: 10/19/2020] [Indexed: 12/28/2022]
Abstract
In research focused on the intestine of parasitic nematodes, we recently identified small molecule inhibitors toxic to intestinal cells of larval Ascaris suum (nematode intestinal toxins/toxicants; “NITs”). Some NITs had anthelmintic activity across the phylogenetic diversity of the Nematoda. The whole-worm motility inhibition assay quantified anthelmintic activity, but worm responses to NITs in relation to pathology or affected molecular pathways was not acquired. In this study we extended this research to more comprehensively determine in whole larval A. suum the cells, organ systems, molecular targets, and potential cellular pathways involved in mechanisms of toxicity leading to cell death. The experimental system utilized fluorescent nuclear probes (bisbenzimide, propidium iodide), NITs, an A. suum larval parasite culture system and transcriptional responses (RNA-seq) to NITs. The approach provides for rapid resolution of NIT-induced cell death among organ systems (e.g. intestine, excretory, esophagus, hypodermis and seam cells, and nervous), discriminates among NITs based on cell death profiles, and identifies cells and organ systems with the greatest NIT sensitivity (e.g. intestine and apparent neuronal cells adjacent to the nerve ring). Application was extended to identify cells and organs sensitive to several existing anthelmintics. This approach also resolved intestinal cell death and irreparable damage induced in adult A. suum by two NITs, establishing a new model to elucidate relevant pathologic mechanisms in adult worms. RNA-seq analysis resolved A. suum genes responsive to treatments with three NITs, identifying dihydroorotate dehydrogenase (uridine synthesis) and RAB GTPase(s) (vesicle transport) as potential targets/pathways leading to cell death. A set of genes induced by all three NITs tested suggest common stress or survival responses activated by NITs. Beyond the presented specific lines of research, elements of the overall experimental system presented in this study have broad application toward systematic development of new anthelmintics. A unique rapid cell death assay was developed for parasitic nematodes. Multiple drug-like molecules cause widespread cell death in many organs of A. suum. Multiple cell and organ systems were validated as targets for anthelmintics. Potential drug targets/pathways were implicated in activating cell death processes.
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Affiliation(s)
- Douglas P Jasmer
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA, 99164, USA
| | - Bruce A Rosa
- Division of Infectious Diseases, Department of Medicine, Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Rahul Tyagi
- Division of Infectious Diseases, Department of Medicine, Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Makedonka Mitreva
- Division of Infectious Diseases, Department of Medicine, Washington University School of Medicine, St. Louis, MO, 63110, USA; Department of Genetics, Washington University School of Medicine, St. Louis, MO 63110, St. Louis, MO, 63110, USA; McDonnell Genome Institute, Washington University School of Medicine, St. Louis, Missouri, 63108, USA.
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16
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Hunt PR, Camacho JA, Sprando RL. Caenorhabditis elegans for predictive toxicology. CURRENT OPINION IN TOXICOLOGY 2020. [DOI: 10.1016/j.cotox.2020.02.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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17
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Helal MA, Abdel-Gawad AM, Kandil OM, Khalifa MME, Cave GWV, Morrison AA, Bartley DJ, Elsheikha HM. Nematocidal Effects of a Coriander Essential Oil and Five Pure Principles on the Infective Larvae of Major Ovine Gastrointestinal Nematodes In Vitro. Pathogens 2020; 9:E740. [PMID: 32916863 PMCID: PMC7558654 DOI: 10.3390/pathogens9090740] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 09/05/2020] [Accepted: 09/07/2020] [Indexed: 12/22/2022] Open
Abstract
The anthelmintic effects of extracted coriander oil and five pure essential oil constituents (geraniol, geranyl acetate, eugenol, methyl iso-eugenol, and linalool) were tested, using larval motility assay, on the third-stage larvae (L3s) of Haemonchus contortus, Trichostrongylus axei, Teladorsagia circumcincta, Trichostrongylus colubriformis, Trichostrongylus vitrinus and Cooperia oncophora. Coriander oil and linalool, a major component of tested coriander oil, showed a strong inhibitory efficacy against all species, except C. oncophora with a half maximal inhibitory concentration (IC50) that ranged from 0.56 to 1.41% for the coriander oil and 0.51 to 1.76% for linalool. The coriander oil and linalool combinations conferred a synergistic anthelmintic effect (combination index [CI] <1) on larval motility comparable to positive control (20 mg/mL levamisole) within 24 h (p < 0.05), reduced IC50 values to 0.11-0.49% and induced a considerable structural damage to L3s. Results of the combined treatment were validated by quantitative fluorometric microplate-based assays using Sytox green, propidium iodide and C12-resazurin, which successfully discriminated live/dead larvae. Only Sytox green staining achieved IC50 values comparable to that of the larval motility assay. The cytotoxicity of the combined coriander oil and linalool on Madin-Darby Canine Kidney cells was evaluated using sulforhodamine-B (SRB) assay and showed no significant cytotoxic effect at concentrations < 1%. These results indicate that testing essential oils and their main components may help to find new potential anthelmintic compounds, while at the same time reducing the reliance on synthetic anthelmintics.
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Affiliation(s)
- Mohamed A. Helal
- School of Veterinary Medicine and Science, Faculty of Medicine and Health Sciences, University of Nottingham, Leicestershire LE12 5RD, UK;
- Department of Parasitology and Animal Diseases, Veterinary Research Division, National Research Centre, Giza 12622, Egypt;
| | - Ahmed M. Abdel-Gawad
- Parasitology Department, Faculty of Veterinary Medicine, Cairo University, Giza 12211, Egypt; (A.M.A.-G.); (M.M.E.K.)
| | - Omnia M. Kandil
- Department of Parasitology and Animal Diseases, Veterinary Research Division, National Research Centre, Giza 12622, Egypt;
| | - Marwa M. E. Khalifa
- Parasitology Department, Faculty of Veterinary Medicine, Cairo University, Giza 12211, Egypt; (A.M.A.-G.); (M.M.E.K.)
| | - Gareth W. V. Cave
- School of Science and Technology, Nottingham Trent University, Nottingham NG11 8NS, UK;
| | - Alison A. Morrison
- Disease Control, Moredun Research Institute, Pentlands Science Park, Bush Loan, Penicuik EH26 0PZ, Edinburgh, UK; (A.A.M.); (D.J.B.)
| | - David J. Bartley
- Disease Control, Moredun Research Institute, Pentlands Science Park, Bush Loan, Penicuik EH26 0PZ, Edinburgh, UK; (A.A.M.); (D.J.B.)
| | - Hany M. Elsheikha
- School of Veterinary Medicine and Science, Faculty of Medicine and Health Sciences, University of Nottingham, Leicestershire LE12 5RD, UK;
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18
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Jesudoss Chelladurai JRJ, Martin KA, Chinchilla-Vargas K, Jimenez Castro PD, Kaplan RM, Brewer MT. Laboratory assays reveal diverse phenotypes among microfilariae of Dirofilaria immitis isolates with known macrocyclic lactone susceptibility status. PLoS One 2020; 15:e0237150. [PMID: 32760111 PMCID: PMC7410292 DOI: 10.1371/journal.pone.0237150] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Accepted: 07/21/2020] [Indexed: 11/24/2022] Open
Abstract
Prevention of canine heartworm disease caused by Dirofilaria immitis relies on chemoprophylaxis with macrocyclic lactone anthelmintics. Alarmingly, there are increased reports of D. immitis isolates with resistance to macrocyclic lactones and the ability to break through prophylaxis. Yet, there is not a well-established laboratory assay that can utilize biochemical phenotypes of microfilariae to predict drug resistance status. In this study we evaluated laboratory assays measuring cell permeability, metabolism, and P-glycoprotein-mediated efflux. Our assays revealed that trypan blue, propidium iodide staining, and resazurin metabolism could detect differences among D. immitis isolates but none of these approaches could accurately predict drug susceptibility status for all resistant isolates tested. P-glycoprotein assays suggested that the repertoire of P-gp expression is likely to vary among isolates, and investigation of pharmacological differences among different P-gp genes is warranted. Further research is needed to investigate and optimize laboratory assays for D. immitis microfilariae, and caution should be applied when adapting cell death assays to drug screening studies for nematode parasites.
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Affiliation(s)
- Jeba R. J. Jesudoss Chelladurai
- Department of Veterinary Pathology, Iowa State University College of Veterinary Medicine, Ames, IA, United States of America
| | - Katy A. Martin
- Department of Veterinary Pathology, Iowa State University College of Veterinary Medicine, Ames, IA, United States of America
| | - Krystal Chinchilla-Vargas
- Department of Veterinary Pathology, Iowa State University College of Veterinary Medicine, Ames, IA, United States of America
| | - Pablo D. Jimenez Castro
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA, United States of America
- Grupo de Parasitologia Veterinaria, Universidad Nacional de Colombia, Bogotá, Colombia
| | - Ray M. Kaplan
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA, United States of America
| | - Matthew T. Brewer
- Department of Veterinary Pathology, Iowa State University College of Veterinary Medicine, Ames, IA, United States of America
- * E-mail:
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19
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Zhang CZ, Sheng H, Su YX, Xu JQ. An efficient and health-friendly adsorbent N-[4-morpholinecarboximidamidoyl]carboximidamidoylmethylated polyphenylene sulfide for removing heavy metal ions from water. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111860] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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20
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Song S, Han Y, Zhang Y, Ma H, Zhang L, Huo J, Wang P, Liang M, Gao M. Protective role of citric acid against oxidative stress induced by heavy metals in Caenorhabditis elegans. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:36820-36831. [PMID: 31745774 DOI: 10.1007/s11356-019-06853-w] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Accepted: 10/22/2019] [Indexed: 06/10/2023]
Abstract
The adverse effects of heavy metals, such as cadmium, zinc, and copper, occur due to the generation of reactive oxygen species (ROS). The use of Caenorhabditis elegans for the purposes of conservation and biomonitoring is of great interest. In the present study, ROS, malondialdehyde (MDA), and citric acid levels and superoxide dismutase (SOD) and glutathione peroxidase (GPx) activities in a model organism were tested to study toxicity. C. elegans was exposed to three different concentrations of cadmium (CdCl2, 5, 10, 50 μM), zinc (ZnSO4, 10, 100, 500 μM), and copper (CuSO4, 10, 100, 500 μM) for 3 days. ROS levels increased by 1.3- to 2.1-fold with increasing metal concentrations. The MDA content increased by approximately 7-, 5-, 2-fold after exposure to high concentrations of cadmium, zinc, and copper, respectively. Furthermore, the citric acid content increased by approximately 3-fold in the cadmium (Cd, 5 μM), zinc (Zn, 10 μM), and copper (Cu, 100 μM) treatment groups compared to that in untreated C. elegans. Therefore, citric acid may play an important role in heavy metal detoxification. Excess citric acid also slightly increased the LC50 by 1.3- to 2.0-fold, basic movements by 1.0- to 1.5-fold, decreased the ROS content by 2.4- to 2.1-fold, the MDA content by 4- to 2-fold, the SOD activity by 9- to 3-fold, the GPx activity by 4.0- to 3.0-fold, and the mRNA expression levels of GPxs by 3.2- to 1.8-fold after metals treatment. And it is most significantly in the alleviation of citric acid to cadmium. This study not only provides information to further understand the effects of heavy metal exposure on ROS, MDA, GPx, SOD, and citric acid in worms but also indicates that supplemental citric acid can protect animals from heavy metal stress and has broad application prospects in decreasing oxidative damage caused by heavy metals.
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Affiliation(s)
- Shaojuan Song
- Changzhi Medical College, No. 161, Jiefangdong Road, Changzhi, 046000, Shanxi, China.
| | - Yan Han
- School of Life Science, Shanxi University, Taiyuan, 030006, Shanxi, China
| | - Yun Zhang
- Changzhi Medical College, No. 161, Jiefangdong Road, Changzhi, 046000, Shanxi, China
| | - Honglian Ma
- Changzhi Medical College, No. 161, Jiefangdong Road, Changzhi, 046000, Shanxi, China
| | - Lei Zhang
- Changzhi Medical College, No. 161, Jiefangdong Road, Changzhi, 046000, Shanxi, China
| | - Jing Huo
- Changzhi Medical College, No. 161, Jiefangdong Road, Changzhi, 046000, Shanxi, China
| | - Peisheng Wang
- Changzhi Medical College, No. 161, Jiefangdong Road, Changzhi, 046000, Shanxi, China
| | - Mengrui Liang
- Changzhi Medical College, No. 161, Jiefangdong Road, Changzhi, 046000, Shanxi, China
| | - Ming Gao
- Changzhi Medical College, No. 161, Jiefangdong Road, Changzhi, 046000, Shanxi, China
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21
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Vareda JP, Valente AJM, Durães L. Assessment of heavy metal pollution from anthropogenic activities and remediation strategies: A review. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 246:101-118. [PMID: 31176176 DOI: 10.1016/j.jenvman.2019.05.126] [Citation(s) in RCA: 340] [Impact Index Per Article: 68.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 05/21/2019] [Accepted: 05/26/2019] [Indexed: 05/18/2023]
Abstract
Heavy metal pollution is a nefarious issue with implications for life. Heavy metals are natural occurring elements, having both natural and anthropogenic sources. The latter are however the most significant, releasing greater amounts of these pollutants in more toxic and mobile forms. Their chemistry and dynamics in the ecosystems are presented, and the relation to the pollution problematic thereof is discussed. The concentration of heavy metals in several sites, assessed in water, soil and sediment samples, affected by different pollution sources are reviewed. These evidence how human activities impact natural media and how the pollution spreads. The pollution in each media is assessed by the concentration relative to drinking and irrigation water guidelines, and by the geoaccumulation index of soils and sediments. It is found that ore extraction and processing and metallurgical industries stand atop the most polluting sources. Given the dynamics of heavy metal cations and that, most of these are released in liquid effluents, wastewater treatment techniques for the removal of heavy metals are also surveyed and critically discussed. Economic viability at a large municipal scale and the ability to comply with strict regulations are the determining factors in the selection of these techniques. A critical discussion on the viability of such techniques is made, reviewing some literature studies and commenting on their applicability on the previously found polluted media.
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Affiliation(s)
- João P Vareda
- CIEPQPF, Department of Chemical Engineering, University of Coimbra, Rua Sílvio Lima, 3030-790, Coimbra, Portugal
| | - Artur J M Valente
- CQC, Department of Chemistry, University of Coimbra, Rua Larga, 3004-535, Coimbra, Portugal
| | - Luisa Durães
- CIEPQPF, Department of Chemical Engineering, University of Coimbra, Rua Sílvio Lima, 3030-790, Coimbra, Portugal.
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22
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Kim M, Jeong J, Kim H, Choi J. High-throughput COPAS assay for screening of developmental and reproductive toxicity of nanoparticles using the nematode Caenorhabditis elegans. J Appl Toxicol 2019; 39:1470-1479. [PMID: 31287177 DOI: 10.1002/jat.3833] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Revised: 05/13/2019] [Accepted: 05/14/2019] [Indexed: 12/25/2022]
Abstract
With the rapid advancement and numerous applications of engineered nanomaterials (ENMs) in science and technology, their effects on animal health, environment and safety should be considered carefully. However, quick assessment of their effects on developmental and reproductive health and an understanding of how they cause such adverse toxic effects remain challenging, because of the fast-growing number of ENMs and the limitations of the different toxicity assays currently in use as well as lack of suitable animal model systems. In this study, we performed a high-throughput complex object parametric analyzer and sorter (COPAS) assay for assessing the developmental and reproductive toxicity of ENMs using Caenorhabditis elegans and provide descriptions of the data and their subsequent analysis. The results showed significant reproductive and developmental toxicity potential of different ENMs. We assessed the usefulness of this method in terms of error-free data, user-friendliness and results being consistent with those of visual, molecular and cellular studies. Moreover, the COPAS Biosort system could be used on a larger scale to screen thousands of chemicals, drugs, pharmaceuticals and ENMs. This study also indicates that the COPAS-based high-throughput screening system is highly reliable for the assessment of toxicity and health risks of NMs.
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Affiliation(s)
- MinA Kim
- School of Environmental Engineering, University of Seoul, Dongdaemun-gu, Seoul, South Korea
| | - Jaeseong Jeong
- School of Environmental Engineering, University of Seoul, Dongdaemun-gu, Seoul, South Korea
| | - Heejin Kim
- School of Environmental Engineering, University of Seoul, Dongdaemun-gu, Seoul, South Korea
| | - Jinhee Choi
- School of Environmental Engineering, University of Seoul, Dongdaemun-gu, Seoul, South Korea
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23
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Haghani A, Dalton HM, Safi N, Shirmohammadi F, Sioutas C, Morgan TE, Finch CE, Curran SP. Air Pollution Alters Caenorhabditis elegans Development and Lifespan: Responses to Traffic-Related Nanoparticulate Matter. J Gerontol A Biol Sci Med Sci 2019; 74:1189-1197. [PMID: 30828708 PMCID: PMC6625599 DOI: 10.1093/gerona/glz063] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Accepted: 02/06/2019] [Indexed: 11/22/2022] Open
Abstract
Air pollution is a heterogeneous environmental toxicant that impacts humans throughout their life. We introduce Caenorhabditis elegans as a valuable air pollution model with its short lifespan, medium-throughput capabilities, and highly conserved biological pathways that impact healthspan. We exposed developmental and adult life stages of C. elegans to airborne nano-sized particulate matter (nPM) produced by traffic emissions and measured biological and molecular endpoints that changed in response. Acute nPM did not cause lethality in C. elegans, but short-term exposure during larval stage 1 caused delayed development. Gene expression responses to nPM exposure overlapped with responses of mouse and cell culture models of nPM exposure in previous studies. We showed further that the skn-1/Nrf2 antioxidant response has a role in the development and hormetic effects of nPM. This study introduces the worm as a new resource and complementary model for mouse and cultured cell systems to study air pollution toxicity across the lifespan.
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Affiliation(s)
- Amin Haghani
- Leonard Davis School of Gerontology, University of Southern California, Los Angeles
| | - Hans M Dalton
- Leonard Davis School of Gerontology, University of Southern California, Los Angeles
| | - Nikoo Safi
- Department of Biomedical Sciences, Center for Bioinformatics and Genomics, Cedars-Sinai Medical Center, Los Angeles, California
| | | | | | - Todd E Morgan
- Leonard Davis School of Gerontology, University of Southern California, Los Angeles
| | - Caleb E Finch
- Leonard Davis School of Gerontology, University of Southern California, Los Angeles
| | - Sean P Curran
- Leonard Davis School of Gerontology, University of Southern California, Los Angeles,Address correspondence to: Sean P. Curran, PhD, Leonard Davis School of Gerontology, University of Southern California, 3715 McClintock Avenue, Suite 350, Los Angeles, CA 90089. E-mail:
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24
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Ganguli A, Rai P, Balachandran S, Gupta R, Sharma R, Neogi SB. Heavy Metals in Indigenous Preparations Used for Sex Selection During Pregnancy in India. Biol Trace Elem Res 2019; 188:239-244. [PMID: 29909490 DOI: 10.1007/s12011-018-1411-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Accepted: 06/06/2018] [Indexed: 12/29/2022]
Abstract
Indigenous preparations (IPs) have evoked a considerable interest in alleviating infections and chronic diseases and improving wellbeing. While such formulations have been a part of traditional practice in several countries and many have been reviewed scientifically for their claims, several of them until date remain to be investigated. A class of IPs for sex selection by Indian pregnant women exists with an aim of begetting a male offspring. In view of the leads obtained from our previous studies on detrimental effects of the newborn, for instance stillbirths and congenital malformations, we attempted to investigate the samples for heavy metal toxicity. Three samples were chosen following phytochemical analysis and reproductive toxicity of such preparations under in vivo conditions. The selected samples were examined for heavy metals-lead, cadmium, arsenic, and mercury using Microwave-assisted atomic absorption spectroscopy. The upper limit level of lead, mercury, and cadmium was found to be 18.56, 0.11, and 0.84 mg/kg respectively whereas arsenic was not detected. The levels of lead and mercury were found to be manifolds high in the IP samples that were primarily contributed by its constituents. The results of our study indicate the potential risk conferred upon, to both the mother and fetus on account of high levels of lead, mercury, and cadmium.
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Affiliation(s)
| | - Pragya Rai
- Public Health Foundation of India, Indian Institute of Public Health, Delhi, India
| | | | | | - Rashmi Sharma
- Science for Equity, Empowerment and Development (SEED) Division, Department of Science and Technology, Delhi, India
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Jeong J, Kim H, Choi J. In Silico Molecular Docking and In Vivo Validation with Caenorhabditis elegans to Discover Molecular Initiating Events in Adverse Outcome Pathway Framework: Case Study on Endocrine-Disrupting Chemicals with Estrogen and Androgen Receptors. Int J Mol Sci 2019; 20:ijms20051209. [PMID: 30857347 PMCID: PMC6429066 DOI: 10.3390/ijms20051209] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 03/05/2019] [Accepted: 03/06/2019] [Indexed: 12/25/2022] Open
Abstract
Molecular docking is used to analyze structural complexes of a target with its ligand for understanding the chemical and structural basis of target specificity. This method has the potential to be applied for discovering molecular initiating events (MIEs) in the Adverse Outcome Pathway framework. In this study, we aimed to develop in silico–in vivo combined approach as a tool for identifying potential MIEs. We used environmental chemicals from Tox21 database to identify potential endocrine-disrupting chemicals (EDCs) through molecular docking simulation, using estrogen receptor (ER), androgen receptor (AR) and their homology models in the nematode Caenorhabditis elegans (NHR-14 and NHR-69, respectively). In vivo validation was conducted on the selected EDCs with C. elegans reproductive toxicity assay using wildtype N2, nhr-14, and nhr-69 loss-of-function mutant strains. The chemicals showed high binding affinity to tested receptors and showed the high in vivo reproductive toxicity, and this was further confirmed using the mutant strains. The present study demonstrates that the binding affinity from the molecular docking potentially correlates with in vivo toxicity. These results prove that our in silico–in vivo combined approach has the potential to be applied for identifying MIEs. This study also suggests the potential of C. elegans as useful in the in vivo model for validating the in silico approach.
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Affiliation(s)
- Jaeseong Jeong
- School of Environmental Engineering, University of Seoul, 163 Seoulsiripdae-ro, Dongdaemun-gu, Seoul 02504, Korea.
| | - Hunbeen Kim
- School of Environmental Engineering, University of Seoul, 163 Seoulsiripdae-ro, Dongdaemun-gu, Seoul 02504, Korea.
| | - Jinhee Choi
- School of Environmental Engineering, University of Seoul, 163 Seoulsiripdae-ro, Dongdaemun-gu, Seoul 02504, Korea.
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Gong P, Donohue KB, Mayo AM, Wang Y, Hong H, Wilbanks MS, Barker ND, Guan X, Gust KA. Comparative toxicogenomics of three insensitive munitions constituents 2,4-dinitroanisole, nitroguanidine and nitrotriazolone in the soil nematode Caenorhabditis elegans. BMC SYSTEMS BIOLOGY 2018; 12:92. [PMID: 30547801 PMCID: PMC6293504 DOI: 10.1186/s12918-018-0636-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
BACKGROUND Ecotoxicological studies on the insensitive munitions formulation IMX-101 and its components 2,4-dinitroanisole (DNAN), nitroguanidine (NQ) and nitrotriazolone (NTO) in various organisms showed that DNAN was the main contributor to the overall toxicity of IMX-101 and suggested that the three compounds acted independently. These results motivated this toxicogenomics study to discern toxicological mechanisms for these compounds at the molecular level. METHODS Here we used the soil nematode Caenorhabditis elegans, a well-characterized genomics model, as the test organism and a species-specific, transcriptome-wide 44 K-oligo probe microarray for gene expression analysis. In addition to the control treatment, C. elegans were exposed for 24 h to 6 concentrations of DNAN (1.95-62.5 ppm) or NQ (83-2667 ppm) or 5 concentrations of NTO (187-3000 ppm) with ten replicates per treatment. The nematodes were transferred to a clean environment after exposure. Reproduction endpoints (egg and larvae counts) were measured at three time points (i.e., 24-, 48- and 72-h). Gene expression profiling was performed immediately after 24-h exposure to each chemical at the lowest, medium and highest concentrations plus the control with four replicates per treatment. RESULTS Statistical analyses indicated that chemical treatment did not significantly affect nematode reproduction but did induce 2175, 378, and 118 differentially expressed genes (DEGs) in NQ-, DNAN-, and NTO-treated nematodes, respectively. Bioinformatic analysis indicated that the three compounds shared both DEGs and DEG-mapped Reactome pathways. Gene set enrichment analysis further demonstrated that DNAN and NTO significantly altered 12 and 6 KEGG pathways, separately, with three pathways in common. NTO mainly affected carbohydrate, amino acid and xenobiotics metabolism while DNAN disrupted protein processing, ABC transporters and several signal transduction pathways. NQ-induced DEGs were mapped to a wide variety of metabolism, cell cycle, immune system and extracellular matrix organization pathways. CONCLUSION Despite the absence of significant effects on apical reproduction endpoints, DNAN, NTO and NQ caused significant alterations in gene expression and pathways at 1.95 ppm, 187 ppm and 83 ppm, respectively. This study provided supporting evidence that the three chemicals may exert independent toxicity by acting on distinct molecular targets and pathways.
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Affiliation(s)
- Ping Gong
- Environmental Laboratory, U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS, 39180, USA.
| | - Keri B Donohue
- Environmental Laboratory, U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS, 39180, USA
| | - Anne M Mayo
- Environmental Laboratory, U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS, 39180, USA
| | - Yuping Wang
- Division of Bioinformatics and Biostatistics, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR, 72079, USA
| | - Huixiao Hong
- Division of Bioinformatics and Biostatistics, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR, 72079, USA
| | - Mitchell S Wilbanks
- Environmental Laboratory, U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS, 39180, USA
| | - Natalie D Barker
- Bennett Aerospace Inc., 1249 Kildaire Farm Road, Cary, NC, 27511, USA
| | - Xin Guan
- Bennett Aerospace Inc., 1249 Kildaire Farm Road, Cary, NC, 27511, USA
| | - Kurt A Gust
- Environmental Laboratory, U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS, 39180, USA
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Hunt PR, Olejnik N, Bailey KD, Vaught CA, Sprando RL. C. elegans Development and Activity Test detects mammalian developmental neurotoxins. Food Chem Toxicol 2018; 121:583-592. [DOI: 10.1016/j.fct.2018.09.061] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2018] [Revised: 08/29/2018] [Accepted: 09/24/2018] [Indexed: 12/14/2022]
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Yousefzadeh H, Salarian A, Sid Kalal H. Study of Pb (II) adsorption from aqueous solutions by TiO2 functionalized with hydroxide ethyl aniline (PHEA/n-TiO2). J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.03.023] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Hanna SK, Bustos AM, Peterson AW, Reipa V, Scanlan LD, Coskun SH, Cho TJ, Johnson ME, Hackley VA, Nelson BC, Winchester MR, Elliott JT, Petersen EJ. Agglomeration of Escherichia coli with Positively Charged Nanoparticles Can Lead to Artifacts in a Standard Caenorhabditis elegans Toxicity Assay. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:5968-5978. [PMID: 29672024 PMCID: PMC6081640 DOI: 10.1021/acs.est.7b06099] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
The increased use and incorporation of engineered nanoparticles (ENPs) in consumer products requires a robust assessment of their potential environmental implications. However, a lack of standardized methods for nanotoxicity testing has yielded results that are sometimes contradictory. Standard ecotoxicity assays may work appropriately for some ENPs with minimal modification but produce artifactual results for others. Therefore, understanding the robustness of assays for a range of ENPs is critical. In this study, we evaluated the performance of a standard Caenorhabditis elegans ( C. elegans) toxicity assay containing an Escherichia coli ( E. coli) food supply with silicon, polystyrene, and gold ENPs with different charged coatings and sizes. Of all the ENPs tested, only those with a positively charged coating caused growth inhibition. However, the positively charged ENPs were observed to heteroagglomerate with E. coli cells, suggesting that the ENPs impacted the ability of nematodes to feed, leading to a false positive toxic effect on C. elegans growth and reproduction. When the ENPs were tested in two alternate C. elegans assays that did not contain E. coli, we found greatly reduced toxicity of ENPs. This study illustrates a key unexpected artifact that may occur during nanotoxicity assays.
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Affiliation(s)
| | - Antonio Montoro Bustos
- Materials Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899-8313
| | - Alexander W. Peterson
- Materials Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899-8313
| | - Vytas Reipa
- Materials Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899-8313
| | | | - Sanem Hosbas Coskun
- Materials Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899-8313
| | - Tae Joon Cho
- Materials Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899-8313
| | - Monique E. Johnson
- Materials Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899-8313
| | - Vincent A. Hackley
- Materials Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899-8313
| | - Bryant C. Nelson
- Materials Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899-8313
| | - Michael R. Winchester
- Materials Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899-8313
| | - John T. Elliott
- Materials Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899-8313
| | - Elijah J. Petersen
- Materials Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899-8313
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Figueiredo LA, Rebouças TF, Ferreira SR, Rodrigues-Luiz GF, Miranda RC, Araujo RN, Fujiwara RT. Dominance of P-glycoprotein 12 in phenotypic resistance conversion against ivermectin in Caenorhabditis elegans. PLoS One 2018; 13:e0192995. [PMID: 29474375 PMCID: PMC5825046 DOI: 10.1371/journal.pone.0192995] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 02/03/2018] [Indexed: 12/16/2022] Open
Abstract
While diseases caused by nematodes remains a considerable drawback for the livestock, agriculture and public health, anthelmintics drug resistance has been observed over the past years and is a major concern for parasite control. Ivermectin, initially considered as a highly potent drug, currently presents a reduced anti-helminthic efficacy, which is influenced by expression of several ATP-binding cassette transporters (ABC), among them the P-glycoproteins (Pgps). Here we present some evidences of Pgps dominance during Ivermectin resistance/susceptibility using Pgps double silencing in C. elegans and the phylogenetic relationship of Pgps among nematodes, which strengthen the use of this model for study of drug resistance in nematodes. Firstly, we evaluated the quantitative gene expression of 12 out the 15 known Pgps from resistant and WT strains of C. elegans, we demonstrated the upregulation of Pgps 12 and 13 and downregulation of all remaining Pgps in ivermectin resistant strain. By using an RNAi loss-of-function approach we observed that Pgp 12 gene silencing reverts the resistance phenotype to ivermectin, while Pgp 4 gene silencing does not alter the resistance phenotype but induces a resistance in wild type strain. Interestingly, the dual silencing of Pgp 12 and Pgp 4 expression demonstrates the dominance of phenotype promoted by Pgp 12 silencing. Finally, in silico analysis reveals a close relationship between Pgps from C. elegans and several nematodes parasites. Taken together, our results indicate that Pgp 12 is crucial for the resistance to ivermectin and thus a good candidate for further studies aiming to develop specific inhibitors to this transporter, allowing the continuous use of ivermectin to control the burden on animal and human health inflicted by nematode parasites globally.
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Affiliation(s)
- Luiza Almeida Figueiredo
- Department of Parasitology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Thais Fuscaldi Rebouças
- Department of Parasitology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Sebastião Rodrigo Ferreira
- Department of Parasitology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Gabriela Flavia Rodrigues-Luiz
- Department of Parasitology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | | | - Ricardo Nascimento Araujo
- Department of Parasitology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Ricardo Toshio Fujiwara
- Department of Parasitology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
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Counting Caenorhabditis elegans: Protocol Optimization and Applications for Population Growth and Toxicity Studies in Liquid Medium. Sci Rep 2018; 8:904. [PMID: 29343752 PMCID: PMC5772475 DOI: 10.1038/s41598-018-19187-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Accepted: 12/21/2017] [Indexed: 11/25/2022] Open
Abstract
The nematode Caenorhabditis elegans is used extensively in molecular, toxicological and genetics research. However, standardized methods for counting nematodes in liquid culture do not exist despite the wide use of nematodes and need for accurate measurements. Herein, we provide a simple and affordable counting protocol developed to maximize count accuracy and minimize variability in liquid nematode culture. Sources of variability in the counting process were identified and tested in 14 separate experiments. Three variables resulted in significant effects on nematode count: shaking of the culture, priming of pipette tips, and sampling location within a microcentrifuge tube. Between-operator variability did not have a statistically significant effect on counts, even among differently-skilled operators. The protocol was used to assess population growth rates of nematodes in two different but common liquid growth media: axenic modified Caenorhabditis elegans Habitation and Reproduction medium (mCeHR) and S-basal complete. In mCeHR, nematode populations doubled daily for 10 d. S-basal complete populations initially doubled every 12 h, but slowed within 7 d. We also detected a statistically significant difference between embryo-to-hatchling incubation period of 5 d in mCeHR compared to 4 d in S-basal complete. The developed counting method for Caenorhabditis elegans reduces variability and allows for rigorous and reliable experimentation.
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Hunt PR. The C. elegans model in toxicity testing. J Appl Toxicol 2017; 37:50-59. [PMID: 27443595 PMCID: PMC5132335 DOI: 10.1002/jat.3357] [Citation(s) in RCA: 296] [Impact Index Per Article: 42.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Revised: 05/20/2016] [Accepted: 05/21/2016] [Indexed: 12/25/2022]
Abstract
Caenorhabditis elegans is a small nematode that can be maintained at low cost and handled using standard in vitro techniques. Unlike toxicity testing using cell cultures, C. elegans toxicity assays provide data from a whole animal with intact and metabolically active digestive, reproductive, endocrine, sensory and neuromuscular systems. Toxicity ranking screens in C. elegans have repeatedly been shown to be as predictive of rat LD50 ranking as mouse LD50 ranking. Additionally, many instances of conservation of mode of toxic action have been noted between C. elegans and mammals. These consistent correlations make the case for inclusion of C. elegans assays in early safety testing and as one component in tiered or integrated toxicity testing strategies, but do not indicate that nematodes alone can replace data from mammals for hazard evaluation. As with cell cultures, good C. elegans culture practice (GCeCP) is essential for reliable results. This article reviews C. elegans use in various toxicity assays, the C. elegans model's strengths and limitations for use in predictive toxicology, and GCeCP. Published 2016. This article is a U.S. Government work and is in the public domain in the USA. Journal of Applied Toxicology published by John Wiley & Sons Ltd.
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Shooto ND, Dikio CW, Wankasi D, Sikhwivhilu LM, Mtunzi FM, Dikio ED. Novel PVA/MOF Nanofibres: Fabrication, Evaluation and Adsorption of Lead Ions from Aqueous Solution. NANOSCALE RESEARCH LETTERS 2016; 11:414. [PMID: 27644240 PMCID: PMC5028355 DOI: 10.1186/s11671-016-1631-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Accepted: 09/10/2016] [Indexed: 05/08/2023]
Abstract
Plain polyvinyl alcohol (PVA) nanofibres and novel polyvinyl alcohol benzene tetracarboxylate nanofibres incorporated with strontium, lanthanum and antimony ((PVA/Sr-TBC), (PVA/La-TBC) and (PVA/Sb-TBC)), respectively, where TBC is benzene 1,2,4,5-tetracarboxylate adsorbents, were fabricated by electrospinning. The as-prepared electrospun nanofibres were characterized by scanning electron microscope (SEM), Fourier transform infrared (FTIR) and thermogravimetric analysis (TGA). Only plain PVA nanofibres followed the Freundlich isotherm with a correlation coefficient of 0.9814, while novel nanofibres (PVA/Sb-TBC, PVA/Sr-TBC and PVA/La-TBC) followed the Langmuir isotherm with correlation coefficients of 0.9999, 0.9994 and 0.9947, respectively. The sorption process of all nanofibres followed a pseudo second-order kinetic model. Adsorption capacity of novel nanofibres was twofold and more compared to that of plain PVA nanofibres. The thermodynamic studies: apparent enthalpy (ΔH°) and entropy (ΔS°), showed that the adsorption of Pb(II) onto nanofibres was spontaneous and exothermic. The novel nanofibres exhibited higher potential removal of Pb(II) ions than plain PVA nanofibres. Ubiquitous cations adsorption test was also investigated and studied.
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Affiliation(s)
- Ntaote David Shooto
- Applied Chemistry and Nano-Science Laboratory, Department of Chemistry, Vaal University of Technology, P.O. Box X021, Vanderbijlpark, 1900 South Africa
| | - Charity Wokwu Dikio
- Applied Chemistry and Nano-Science Laboratory, Department of Chemistry, Vaal University of Technology, P.O. Box X021, Vanderbijlpark, 1900 South Africa
| | - Donbebe Wankasi
- Applied Chemistry and Nano-Science Laboratory, Department of Chemistry, Vaal University of Technology, P.O. Box X021, Vanderbijlpark, 1900 South Africa
| | - Lucky Mashudu Sikhwivhilu
- Advanced Materials Division, Mintek, Nanotechnology Innovation Centre, Private Bag X3015, Randburg, 2125 South Africa
| | - Fanyana Moses Mtunzi
- Applied Chemistry and Nano-Science Laboratory, Department of Chemistry, Vaal University of Technology, P.O. Box X021, Vanderbijlpark, 1900 South Africa
| | - Ezekiel Dixon Dikio
- Applied Chemistry and Nano-Science Laboratory, Department of Chemistry, Vaal University of Technology, P.O. Box X021, Vanderbijlpark, 1900 South Africa
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Clavijo A, Kronberg MF, Rossen A, Moya A, Calvo D, Salatino SE, Pagano EA, Morábito JA, Munarriz ER. The nematode Caenorhabditis elegans as an integrated toxicological tool to assess water quality and pollution. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 569-570:252-261. [PMID: 27343944 DOI: 10.1016/j.scitotenv.2016.06.057] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Revised: 06/09/2016] [Accepted: 06/09/2016] [Indexed: 05/14/2023]
Abstract
Determination of water quality status in rivers is critical to establish a sustainable water management policy. For this reason, over the last decades it has been recommended to perform integrated water assessments that include water quantities and physicochemical, ecological and toxicological tests. However, sometimes resources are limited and it is not possible to perform large-scale chemical determinations of pollutants or conduct numerous ecotoxicological tests. To overcome this problem we use and measure the growth, as a response parameter, of the soil nematode Caenorhabditis elegans to assess water quality in rivers. The C. elegans is a ubiquitous organism that has emerged as an important model organism in aquatic and soil toxicology research. The Tunuyán River Basin (Province of Mendoza, Argentina) has been selected as a representative traditional water monitoring system to test the applicability of the C. elegans toxicological bioassay to generate an integrated water quality evaluation. Jointly with the C. elegans toxic assays, physicochemical and bacteriological parameters were determined for each monitoring site. C. elegans bioassays help to identify different water qualities in the river basin. Multivariate statistical analysis (PCA and linear regression models) has allowed us to confirm that traditional water quality studies do not predict potential toxic effects on living organisms. On the contrary, physicochemical and bacteriological analyzes explain <62% of the C. elegans growth response variability, showing that ecotoxicological bioassays are important to obtain a realistic scenario of water quality threats. Our results confirm that the C. elegans bioassay is a sensible and suitable tool to assess toxicity and should be implemented in routine water quality monitoring.
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Affiliation(s)
- Araceli Clavijo
- Instituto de Investigaciones en Biociencias Agrícolas y Ambientales, CONICET-Facultad de Agronomía, Universidad de Buenos Aires. Av. San Martín 4453 C1417DSE, CABA, Argentina; Cátedra de Bioquímica, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453 C1417DSE, CABA, Argentina
| | - María Florencia Kronberg
- Instituto de Investigaciones en Biociencias Agrícolas y Ambientales, CONICET-Facultad de Agronomía, Universidad de Buenos Aires. Av. San Martín 4453 C1417DSE, CABA, Argentina; Cátedra de Bioquímica, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453 C1417DSE, CABA, Argentina
| | - Ariana Rossen
- Laboratorio Experimental de Tecnologías Sustentables, Instituto Nacional del Agua, Av. Ezeiza-Cañuelas, tramo Jorge Newbery Km 1,620 Pcia, Buenos Aires, Argentina
| | - Aldana Moya
- Cátedra de Protección Vegetal, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453 C1417DSE, CABA, Argentina
| | - Daniel Calvo
- Dirección de Servicios Hidrológicos, Instituto Nacional del Agua, Av. Ezeiza-Cañuelas, tramo Jorge Newbery Km 1,620 Pcia, Buenos Aires, Argentina
| | | | - Eduardo Antonio Pagano
- Instituto de Investigaciones en Biociencias Agrícolas y Ambientales, CONICET-Facultad de Agronomía, Universidad de Buenos Aires. Av. San Martín 4453 C1417DSE, CABA, Argentina; Cátedra de Bioquímica, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453 C1417DSE, CABA, Argentina
| | - José Antonio Morábito
- Centro Regional Andino, Instituto Nacional del Agua, Belgrano 210 (M5500FIF) Mendoza, Argentina; Facultad de Ciencias Agrarias (UNCuyo), Alte. Brown 500, Chacras de Coria, Luján de Cuyo, Mendoza, Argentina
| | - Eliana Rosa Munarriz
- Instituto de Investigaciones en Biociencias Agrícolas y Ambientales, CONICET-Facultad de Agronomía, Universidad de Buenos Aires. Av. San Martín 4453 C1417DSE, CABA, Argentina; Cátedra de Bioquímica, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453 C1417DSE, CABA, Argentina.
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Doh JH, Moore AB, Çelen İ, Moore MT, Sabanayagam CR. ChIP and Chips: Introducing the WormPharm for correlative studies employing pharmacology and genome-wide analyses in C. elegans. J Biol Methods 2016; 3:e44. [PMID: 31453211 PMCID: PMC6706132 DOI: 10.14440/jbm.2016.109] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Revised: 04/25/2016] [Accepted: 04/29/2016] [Indexed: 12/21/2022] Open
Abstract
We present the WormPharm, an automated microfluidic platform that utilizes an axenic medium to culture C. elegans. The WormPharm is capable of sustaining C. elegans for extended periods, while recording worm development and growth with high temporal resolution ranging from seconds to minutes over several days to months. We demonstrate the utility of the device to monitor C. elegans growth in the presence of varying doses of nicotine and alcohol. Furthermore, we show that C. elegans cultured in the WormPharm are amendable for high-throughput genomic assays, i.e. chromatin-immunoprecipitation followed by next generation sequencing, and confirm that nematodes grown in monoxenic and axenic cultures exhibit genetic modifications that correlate with observed phenotypes. The WormPharm is a powerful tool for analyzing the effects of chemical, nutritional and environmental variations on organism level responses in conjunction with genome-wide changes in C. elegans.
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Affiliation(s)
- Jung H Doh
- University of Delaware, Delaware Biotechnology Institute, Newark, DE, USA
| | - Andrew B Moore
- University of Delaware, Department of Biological Sciences, Newark, DE, USA
| | - İrem Çelen
- University of Delaware, Center for Bioinformatics and Computational Biology, Newark, DE, USA
| | - Michael T Moore
- University of Delaware, Delaware Biotechnology Institute, Newark, DE, USA
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Wang B, Pachaiyappan B, Gruber JD, Schmidt MG, Zhang YM, Woster PM. Antibacterial Diamines Targeting Bacterial Membranes. J Med Chem 2016; 59:3140-51. [PMID: 26964758 DOI: 10.1021/acs.jmedchem.5b01912] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Antibiotic resistance is a growing threat to human health exacerbated by a lack of new antibiotics. We now describe a series of substituted diamines that produce rapid bactericidal activity against both Gram-positive and Gram-negative bacteria, including methicillin-resistant Staphylococcus aureus and stationary-phase bacteria. These compounds reduce biofilm formation and promote biofilm dispersal in Pseudomonas aeruginosa. The most potent analogue, 3 (1,13-bis{[(2,2-diphenyl)-1-ethyl]thioureido}-4,10-diazatridecane), primarily acts by depolarization of the cytoplasmic membrane and permeabilization of the bacterial outer membrane. Transmission electron microscopy confirmed that 3 disrupts membrane integrity rapidly. Compound 3 is also synergistic with kanamycin, demonstrated by the checkerboard method and by time-kill kinetic experiments. In human cell toxicity assays, 3 showed limited adverse effects against the HEK293T human kidney embryonic cells and A549 human adenocarcinoma cells. In addition, 3 produced no adverse effects on Caenorhabditis elegans development, survival, and reproduction. Collectively, diamines related to 3 represent a new class of broad-spectrum antibacterials against drug-resistant pathogens.
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Affiliation(s)
- Bo Wang
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina , Charleston, South Carolina 29425, United States.,Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing, PR China
| | - Boobalan Pachaiyappan
- Department of Drug Discovery and Biomedical Sciences, Medical University of South Carolina , Charleston, South Carolina 29425, United States
| | - Jordon D Gruber
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina , Charleston, South Carolina 29425, United States
| | - Michael G Schmidt
- Department of Microbiology & Immunology, Medical University of South Carolina , Charleston, South Carolina 29425, United States
| | - Yong-Mei Zhang
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina , Charleston, South Carolina 29425, United States
| | - Patrick M Woster
- Department of Drug Discovery and Biomedical Sciences, Medical University of South Carolina , Charleston, South Carolina 29425, United States
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Tejeda-Benitez L, Olivero-Verbel J. Caenorhabditis elegans, a Biological Model for Research in Toxicology. REVIEWS OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2016; 237:1-35. [PMID: 26613986 DOI: 10.1007/978-3-319-23573-8_1] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Caenorhabditis elegans is a nematode of microscopic size which, due to its biological characteristics, has been used since the 1970s as a model for research in molecular biology, medicine, pharmacology, and toxicology. It was the first animal whose genome was completely sequenced and has played a key role in the understanding of apoptosis and RNA interference. The transparency of its body, short lifespan, ability to self-fertilize and ease of culture are advantages that make it ideal as a model in toxicology. Due to the fact that some of its biochemical pathways are similar to those of humans, it has been employed in research in several fields. C. elegans' use as a biological model in environmental toxicological assessments allows the determination of multiple endpoints. Some of these utilize the effects on the biological functions of the nematode and others use molecular markers. Endpoints such as lethality, growth, reproduction, and locomotion are the most studied, and usually employ the wild type Bristol N2 strain. Other endpoints use reporter genes, such as green fluorescence protein, driven by regulatory sequences from other genes related to different mechanisms of toxicity, such as heat shock, oxidative stress, CYP system, and metallothioneins among others, allowing the study of gene expression in a manner both rapid and easy. These transgenic strains of C. elegans represent a powerful tool to assess toxicity pathways for mixtures and environmental samples, and their numbers are growing in diversity and selectivity. However, other molecular biology techniques, including DNA microarrays and MicroRNAs have been explored to assess the effects of different toxicants and samples. C. elegans has allowed the assessment of neurotoxic effects for heavy metals and pesticides, among those more frequently studied, as the nematode has a very well defined nervous system. More recently, nanoparticles are emergent pollutants whose toxicity can be explored using this nematode. Overall, almost every type of known toxicant has been tested with this animal model. In the near future, the available knowledge on the life cycle of C. elegans should allow more studies on reproduction and transgenerational toxicity for newly developed chemicals and materials, facilitating their introduction in the market. The great diversity of endpoints and possibilities of this animal makes it an easy first-choice for rapid toxicity screening or to detail signaling pathways involved in mechanisms of toxicity.
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Affiliation(s)
- Lesly Tejeda-Benitez
- Environmental and Computational Chemistry Group, School of Pharmaceutical Sciences, Zaragocilla Campus, University of Cartagena, Cartagena, 130014, Colombia.
| | - Jesus Olivero-Verbel
- Environmental and Computational Chemistry Group, School of Pharmaceutical Sciences, Zaragocilla Campus, University of Cartagena, Cartagena, 130014, Colombia.
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McCammon JM, Sive H. Addressing the Genetics of Human Mental Health Disorders in Model Organisms. Annu Rev Genomics Hum Genet 2015; 16:173-97. [DOI: 10.1146/annurev-genom-090314-050048] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jasmine M. McCammon
- Whitehead Institute for Biomedical Research, Cambridge, Massachusetts 02142;
| | - Hazel Sive
- Whitehead Institute for Biomedical Research, Cambridge, Massachusetts 02142;
- Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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A new methodology for evaluation of nematode viability. BIOMED RESEARCH INTERNATIONAL 2015; 2015:879263. [PMID: 25866820 PMCID: PMC4383492 DOI: 10.1155/2015/879263] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Accepted: 02/19/2015] [Indexed: 01/19/2023]
Abstract
Nematodes infections are responsible for debilitating conditions and economic losses in domestic animals as well as livestock and are considered an important public health problem due to the high prevalence in humans. The nematode resistance for drugs has been reported for livestock, highlighting the importance for development of new anthelmintic compounds. The aim of the current study was to apply and compare fluorimetric techniques using Sytox and propidium iodide for evaluating the viability of C. elegans larvae after treatment with anthelmintic drugs. These fluorescent markers were efficient to stain larvae treated with ivermectin and albendazole sulfoxide. We observed that densitometric values were proportional to the concentration of dead larvae stained with both markers. Furthermore, data on motility test presented an inverse correlation with fluorimetric data when ivermectin was used. Our results showed that lower concentrations of drugs were effective to interfere in the processes of cellular transport while higher drugs concentrations were necessary in order to result in any damage to cell integrity. The methodology described in this work might be useful for studies that aim to evaluate the viability of nematodes, particularly for testing of new anthelminthic compounds using an easy, economic, reproducible, and no time-consuming technique.
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Hägerbäumer A, Höss S, Heininger P, Traunspurger W. Experimental studies with nematodes in ecotoxicology: an overview. J Nematol 2015; 47:11-27. [PMID: 25861113 PMCID: PMC4388576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Indexed: 06/04/2023] Open
Abstract
With respect to their high abundances, their role as intermediaries between microorganisms and higher trophic levels, and their ubiquitous occurrence in all habitats, nematodes are of strong potential interest as environmental indicators. Ecotoxicological methods to evaluate the risk of anthropogenic pollutants on ecosystems require both in vitro and in vivo toxicity tests to investigate either mechanisms or pathways of toxicity and to set accurate toxicity thresholds. For this, the interest in nematodes as model organisms in ecotoxicology increased over the past few decades and existing appropriate experimental methods are reviewed in this manuscript. An overview of the various existing ecotoxicological tools for nematodes, ranging from molecular laboratory methods to experimental model ecosystem approaches, and their role as indicator organisms is given. The reviewed studies, approaches that range from species-based to community-based methods, reveal exciting possibilities for the future use of nematodes in ecotoxicological studies. Suitable ecotoxicological tools and ecological indices for nematodes should be integrated in weight-of-evidence approaches for assessing the ecological risk of contamination.
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Affiliation(s)
- Arne Hägerbäumer
- Department of Animal Ecology, University of Bielefeld, Konsequenz 45, 33615 Bielefeld, Germany
| | | | - Peter Heininger
- German Federal Institute of Hydrology, Mainzer Tor 1, 56968 Koblenz, Germany
| | - Walter Traunspurger
- Department of Animal Ecology, University of Bielefeld, Konsequenz 45, 33615 Bielefeld, Germany
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Nematicidal activity of Annona crassiflora leaf extract on Caenorhabditis elegans. Parasit Vectors 2015; 8:113. [PMID: 25885032 PMCID: PMC4336742 DOI: 10.1186/s13071-015-0708-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Accepted: 01/31/2015] [Indexed: 12/24/2022] Open
Abstract
Background The aim of this work was to investigate the potential nematicidal activity of Annona crassiflora leaf extract against Caenorhabditis elegans. Methods The hydroalcoholic leaf extract and its fractions (dichloromethane, ethyl acetate, methanol and water) were submitted to mobility assay against the roundworm Caenorhabditis elegans. GC-MS and NMR analysis were performed in order to identify metabolites. Results The dichloromethane and ethyl acetate fractions showed to be the most active among the hydroalcoholic leaf extracts and its four fractions. The percentages of C. elegans larvae immobility were 98.13 and 89.66%, respectively, at a concentration of 1000 μg.mL−1. Besides some amino acids, palmitic acid methyl ester, 2-isopropyl-5-methylcyclohexanol, oleic acid methyl esther, stearic acid methyl ester, quercetin and kaempferol were also identified in these fractions. Conclusion The results indicated that of A. crassiflora leaf ethanolic extract has a good potential as a source for natural nematicide.
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Soria C, Coccini T, De Simone U, Marchese L, Zorzoli I, Giorgetti S, Raimondi S, Mangione PP, Ramat S, Bellotti V, Manzo L, Stoppini M. Enhanced toxicity of silver nanoparticles in transgenic Caenorhabditis elegans expressing amyloidogenic proteins. Amyloid 2015; 22:221-8. [PMID: 26466638 DOI: 10.3109/13506129.2015.1077216] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The increasing number of applications of silver nanoparticles (AgNP) prompted us to assess their toxicity in vivo. We have investigated their effects on wild type and transgenic Caenorhabditis elegans (C. elegans) strains expressing two prototypic amyloidogenic proteins: β2-microglobulin and Aβ peptide3-42. The use of C. elegans allowed us to highlight AgNP toxicity in the early phase of the worm's life cycle (LC50 survival, 0.9 µg/ml). A comparative analysis of LC50 values revealed that our nematode strains were more sensitive to assess AgNP toxicity than the cell lines, classically used in toxicity tests. Movement and superoxide production in the adult population were significantly affected by exposure to AgNP; the transgenic strains were more affected than the wild type worms. Our screening approach could be applied to other types of nanomaterials that can enter the body and express any nanostructure-related bioactivities. We propose that C. elegans reproducing the molecular events associated with protein misfolding diseases, e.g. Alzheimer's disease and systemic amyloidosis, may help to investigate the specific toxicity of a range of potentially harmful molecules. Our study suggests that transgenic C. elegans may be used to predict the effect of chemicals in a "fragile population", where an underlying pathologic state may amplify their toxicity.
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Affiliation(s)
- Cristina Soria
- a Department of Molecular Medicine , Institute of Biochemistry, University of Pavia , Pavia , Italy
| | - Teresa Coccini
- b Laboratory of Experimental and Clinical Toxicology, Toxicology Division, Department of Environmental Medicine , IRCCS Salvatore Maugeri Foundation, Scientific Institute of Pavia Medical Centre , Pavia , Italy
| | - Uliana De Simone
- c Toxicology Unit, Department of Clinical Surgical , Diagnostic and Pediatric Sciences, Faculty of Medicine and Surgery, University of Pavia , Pavia , Italy
| | - Loredana Marchese
- a Department of Molecular Medicine , Institute of Biochemistry, University of Pavia , Pavia , Italy
| | - Irene Zorzoli
- d Department of Internal Medicine and Clinical Therapeutics , University of Pavia , Pavia , Italy
| | - Sofia Giorgetti
- a Department of Molecular Medicine , Institute of Biochemistry, University of Pavia , Pavia , Italy
| | - Sara Raimondi
- a Department of Molecular Medicine , Institute of Biochemistry, University of Pavia , Pavia , Italy
| | - P Patrizia Mangione
- a Department of Molecular Medicine , Institute of Biochemistry, University of Pavia , Pavia , Italy .,e Wolfson Drug Discovery Unit, Centre for Amyloidosis and Acute Phase Proteins, Division of Medicine, University College London , London , UK , and
| | - Stefano Ramat
- f Bioengineering Laboratory, Department of Computer , Electrical and Biomedical Engineering, University of Pavia , Pavia , Italy
| | - Vittorio Bellotti
- a Department of Molecular Medicine , Institute of Biochemistry, University of Pavia , Pavia , Italy .,e Wolfson Drug Discovery Unit, Centre for Amyloidosis and Acute Phase Proteins, Division of Medicine, University College London , London , UK , and
| | - Luigi Manzo
- b Laboratory of Experimental and Clinical Toxicology, Toxicology Division, Department of Environmental Medicine , IRCCS Salvatore Maugeri Foundation, Scientific Institute of Pavia Medical Centre , Pavia , Italy .,c Toxicology Unit, Department of Clinical Surgical , Diagnostic and Pediatric Sciences, Faculty of Medicine and Surgery, University of Pavia , Pavia , Italy
| | - Monica Stoppini
- a Department of Molecular Medicine , Institute of Biochemistry, University of Pavia , Pavia , Italy
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Hunt PR, Keltner Z, Gao X, Oldenburg SJ, Bushana P, Olejnik N, Sprando RL. Bioactivity of nanosilver in Caenorhabditis elegans: Effects of size, coat, and shape. Toxicol Rep 2014; 1:923-944. [PMID: 28962305 PMCID: PMC5598322 DOI: 10.1016/j.toxrep.2014.10.020] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Revised: 10/23/2014] [Accepted: 10/24/2014] [Indexed: 01/18/2023] Open
Abstract
The in vivo toxicity to eukaryotes of nanosilver (AgNP) spheres and plates in two sizes each was assessed using the simple model organism Caenorhabditis elegans. For each shape, smaller AgNP size correlated with higher toxicity, as indicated by reduced larval growth. Smaller size also correlated with significant increases in silver uptake for silver nanospheres. Citrate coated silver spheres of 20 nm diameter induced an innate immune response that increased or held steady over 24 h, while regulation of genes involved in metal metabolism peaked at 4 h and subsequently decreased. For AgNP spheres, coating altered bioactivity, with a toxicity ranking of polyethylene glycol (PEG) > polyvinylpyrrolidone (PVP) ≅ branched polyethyleneimine (BPEI) > citrate, but silver uptake ranking of PEG > PVP > citrate > BPEI. Our findings in C. elegans correlate well with findings in rodents for AgNP size vs. uptake and toxicity, as well as for induction of immune effectors, while using methods that are faster and far less expensive, supporting the use of C. elegans as an alternative model for early toxicity screening.
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Affiliation(s)
- Piper Reid Hunt
- Center for Food Safety and Applied Nutrition, FDA, Laurel, MD, United States
| | - Zachary Keltner
- Center for Food Safety and Applied Nutrition, FDA, Laurel, MD, United States
| | - Xiugong Gao
- Center for Food Safety and Applied Nutrition, FDA, Laurel, MD, United States
| | | | - Priyanka Bushana
- Center for Food Safety and Applied Nutrition, FDA, Laurel, MD, United States
| | - Nicholas Olejnik
- Center for Food Safety and Applied Nutrition, FDA, Laurel, MD, United States
| | - Robert L Sprando
- Center for Food Safety and Applied Nutrition, FDA, Laurel, MD, United States
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Ju J, Saul N, Kochan C, Putschew A, Pu Y, Yin L, Steinberg CEW. Cyanobacterial xenobiotics as evaluated by a Caenorhabditis elegans neurotoxicity screening test. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2014; 11:4589-606. [PMID: 24776722 PMCID: PMC4053867 DOI: 10.3390/ijerph110504589] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Revised: 04/08/2014] [Accepted: 04/14/2014] [Indexed: 01/28/2023]
Abstract
In fresh waters cyanobacterial blooms can produce a variety of toxins, such as microcystin variants (MCs) and anatoxin-a (ANA). ANA is a well-known neurotoxin, whereas MCs are hepatotoxic and, to a lesser degree, also neurotoxic. Neurotoxicity applies especially to invertebrates lacking livers. Current standardized neurotoxicity screening methods use rats or mice. However, in order to minimize vertebrate animal experiments as well as experimental time and effort, many investigators have proposed the nematode Caenorhabditis elegans as an appropriate invertebrate model. Therefore, four known neurotoxic compounds (positive compounds: chlorpyrifos, abamectin, atropine, and acrylamide) were chosen to verify the expected impacts on autonomic (locomotion, feeding, defecation) and sensory (thermal, chemical, and mechanical sensory perception) functions in C. elegans. This study is another step towards successfully establishing C. elegans as an alternative neurotoxicity model. By using this protocol, anatoxin-a adversely affected locomotive behavior and pharyngeal pumping frequency and, most strongly, chemotactic and thermotactic behavior, whereas MC-LR impacted locomotion, pumping, and mechanical behavior, but not chemical sensory behavior. Environmental samples can also be screened in this simple and fast way for neurotoxic characteristics. The filtrate of a Microcystis aeruginosa culture, known for its hepatotoxicity, also displayed mild neurotoxicity (modulated short-term thermotaxis). These results show the suitability of this assay for environmental cyanotoxin-containing samples.
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Affiliation(s)
- Jingjuan Ju
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing 210009, China.
| | - Nadine Saul
- Department of Biology, Freshwater and Stress Ecology, Humboldt-Universität zu Berlin, Späthstr. 80/81, Berlin 12437, Germany.
| | - Cindy Kochan
- Chair of Water Quality Control, Technische Universität Berlin, Straße des 17. Juni 135, Berlin 10623, Germany.
| | - Anke Putschew
- Chair of Water Quality Control, Technische Universität Berlin, Straße des 17. Juni 135, Berlin 10623, Germany.
| | - Yuepu Pu
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing 210009, China.
| | - Lihong Yin
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing 210009, China.
| | - Christian E W Steinberg
- Department of Biology, Freshwater and Stress Ecology, Humboldt-Universität zu Berlin, Späthstr. 80/81, Berlin 12437, Germany.
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Lai Y, Xiang M, Liu S, Li E, Che Y, Liu X. A novel high-throughput nematicidal assay using embryo cells and larvae of Caenorhabditis elegans. Exp Parasitol 2014; 139:33-41. [PMID: 24594258 DOI: 10.1016/j.exppara.2014.02.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2013] [Revised: 02/12/2014] [Accepted: 02/18/2014] [Indexed: 12/29/2022]
Abstract
Human health safety and environmental concerns have resulted in the widespread deregistration of several agronomic important nematicides. New and safer nematicides are urgently needed. However, a high-throughput bioassay for screening potential nematicides has not been established. We developed a two-step high-throughput nematicidal screening method to combine a cell-based MTS colorimetric assay with Caenorhabditis elegans embryo cells for preliminary cytotoxicity screening (step 1) followed by in vitro larval assay for nematicidal activity (step 2). Based on three conventional nematicides' test, high correlations were obtained between cell viability and larval viability and "r" values were 0.78 for Avermectin, 0.95 for Fosthiazate, and 0.65 for Formaldehyde solution. Further assays with 60 fungal secondary metabolites (extracts, fractions and pure compounds) also demonstrated the high correlation between cell viability and larval viability (r=0.60) and between the C. elegans cell viability and the juvenile viability of soybean cyst nematode Heterodera glycines (r=0.48) and pine wood nematode Bursaphelenchus xylophilus (r=0.56). Six metabolites with high cytotoxicity have performed high larval mortality with a LC50 range of 6.8-500μg/ml. These results indicate that the proposed two-step screening assay represents an efficient and labor-saving method for screening natural nematicidal products.
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Affiliation(s)
- Yiling Lai
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, No. 3 Park 1, Beichen West Road, Chaoyang District, Beijing 100101, China; University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China
| | - Meichun Xiang
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, No. 3 Park 1, Beichen West Road, Chaoyang District, Beijing 100101, China.
| | - Shuchun Liu
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, No. 3 Park 1, Beichen West Road, Chaoyang District, Beijing 100101, China
| | - Erwei Li
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, No. 3 Park 1, Beichen West Road, Chaoyang District, Beijing 100101, China
| | - Yongsheng Che
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, No. 3 Park 1, Beichen West Road, Chaoyang District, Beijing 100101, China; Beijing Institute of Pharmacology and Toxicology, No. 27 Taiping Road, Haidian District, Beijing 100850, China
| | - Xingzhong Liu
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, No. 3 Park 1, Beichen West Road, Chaoyang District, Beijing 100101, China.
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Galano E, Arciello A, Piccoli R, Monti DM, Amoresano A. A proteomic approach to investigate the effects of cadmium and lead on human primary renal cells. Metallomics 2014; 6:587-97. [DOI: 10.1039/c3mt00344b] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Cadmium and lead affect the viability of primary human renal cells, inducing alterations in the cellular proteome.
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Affiliation(s)
- Eugenio Galano
- Department of Chemical Sciences
- University of Naples “Federico II”
- Naples, Italy
- National Institute of Biostructures and Biosystems (INBB)
- Rome, Italy
| | - Angela Arciello
- Department of Chemical Sciences
- University of Naples “Federico II”
- Naples, Italy
- National Institute of Biostructures and Biosystems (INBB)
- Rome, Italy
| | - Renata Piccoli
- Department of Chemical Sciences
- University of Naples “Federico II”
- Naples, Italy
- National Institute of Biostructures and Biosystems (INBB)
- Rome, Italy
| | - Daria Maria Monti
- Department of Chemical Sciences
- University of Naples “Federico II”
- Naples, Italy
- National Institute of Biostructures and Biosystems (INBB)
- Rome, Italy
| | - Angela Amoresano
- Department of Chemical Sciences
- University of Naples “Federico II”
- Naples, Italy
- National Institute of Biostructures and Biosystems (INBB)
- Rome, Italy
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Shahid M, Pourrut B, Dumat C, Nadeem M, Aslam M, Pinelli E. Heavy-metal-induced reactive oxygen species: phytotoxicity and physicochemical changes in plants. REVIEWS OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2014; 232:1-44. [PMID: 24984833 DOI: 10.1007/978-3-319-06746-9_1] [Citation(s) in RCA: 91] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
As a result of the industrial revolution, anthropogenic activities have enhanced there distribution of many toxic heavy metals from the earth's crust to different environmental compartments. Environmental pollution by toxic heavy metals is increasing worldwide, and poses a rising threat to both the environment and to human health.Plants are exposed to heavy metals from various sources: mining and refining of ores, fertilizer and pesticide applications, battery chemicals, disposal of solid wastes(including sewage sludge), irrigation with wastewater, vehicular exhaust emissions and adjacent industrial activity.Heavy metals induce various morphological, physiological, and biochemical dysfunctions in plants, either directly or indirectly, and cause various damaging effects. The most frequently documented and earliest consequence of heavy metal toxicity in plants cells is the overproduction of ROS. Unlike redox-active metals such as iron and copper, heavy metals (e.g, Pb, Cd, Ni, AI, Mn and Zn) cannot generate ROS directly by participating in biological redox reactions such as Haber Weiss/Fenton reactions. However, these metals induce ROS generation via different indirect mechanisms, such as stimulating the activity of NADPH oxidases, displacing essential cations from specific binding sites of enzymes and inhibiting enzymatic activities from their affinity for -SH groups on the enzyme.Under normal conditions, ROS play several essential roles in regulating the expression of different genes. Reactive oxygen species control numerous processes like the cell cycle, plant growth, abiotic stress responses, systemic signalling, programmed cell death, pathogen defence and development. Enhanced generation of these species from heavy metal toxicity deteriorates the intrinsic antioxidant defense system of cells, and causes oxidative stress. Cells with oxidative stress display various chemical,biological and physiological toxic symptoms as a result of the interaction between ROS and biomolecules. Heavy-metal-induced ROS cause lipid peroxidation, membrane dismantling and damage to DNA, protein and carbohydrates. Plants have very well-organized defense systems, consisting of enzymatic and non-enzymatic antioxidation processes. The primary defense mechanism for heavy metal detoxification is the reduced absorption of these metals into plants or their sequestration in root cells.Secondary heavy metal tolerance mechanisms include activation of antioxidant enzymes and the binding of heavy metals by phytochelatins, glutathione and amino acids. These defense systems work in combination to manage the cascades of oxidative stress and to defend plant cells from the toxic effects of ROS.In this review, we summarized the biochemiCal processes involved in the over production of ROS as an aftermath to heavy metal exposure. We also described the ROS scavenging process that is associated with the antioxidant defense machinery.Despite considerable progress in understanding the biochemistry of ROS overproduction and scavenging, we still lack in-depth studies on the parameters associated with heavy metal exclusion and tolerance capacity of plants. For example, data about the role of glutathione-glutaredoxin-thioredoxin system in ROS detoxification in plant cells are scarce. Moreover, how ROS mediate glutathionylation (redox signalling)is still not completely understood. Similarly, induction of glutathione and phytochelatins under oxidative stress is very well reported, but it is still unexplained that some studied compounds are not involved in the detoxification mechanisms. Moreover,although the role of metal transporters and gene expression is well established for a few metals and plants, much more research is needed. Eventually, when results for more metals and plants are available, the mechanism of the biochemical and genetic basis of heavy metal detoxification in plants will be better understood. Moreover, by using recently developed genetic and biotechnological tools it may be possible to produce plants that have traits desirable for imparting heavy metal tolerance.
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Affiliation(s)
- Muhammad Shahid
- Department of Environmental Sciences, COMSATS Institute of Information Technology, Vehari, 61100, Pakistan
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Hasson SA, Inglese J. Innovation in academic chemical screening: filling the gaps in chemical biology. Curr Opin Chem Biol 2013; 17:329-38. [PMID: 23683346 PMCID: PMC3719966 DOI: 10.1016/j.cbpa.2013.04.018] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2013] [Revised: 03/26/2013] [Accepted: 04/15/2013] [Indexed: 12/12/2022]
Abstract
Academic screening centers across the world have endeavored to discover small molecules that can modulate biological systems. To increase the reach of functional-genomic and chemical screening programs, universities, research institutes, and governments have followed their industrial counterparts in adopting high-throughput paradigms. As academic screening efforts have steadily grown in scope and complexity, so have the ideas of what is possible with the union of technology and biology. This review addresses the recent conceptual and technological innovation that has been propelling academic screening into its own unique niche. In particular, high-content and whole-organism screening are changing how academics search for novel bioactive compounds. Importantly, we recognize examples of successful chemical probe development that have punctuated the changing technology landscape.
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Affiliation(s)
- Samuel A Hasson
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD 20850, USA
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Hunt PR, Marquis BJ, Tyner KM, Conklin S, Olejnik N, Nelson BC, Sprando RL. Nanosilver suppresses growth and induces oxidative damage to DNA in Caenorhabditis elegans. J Appl Toxicol 2013; 33:1131-42. [PMID: 23636779 DOI: 10.1002/jat.2872] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Revised: 01/15/2013] [Accepted: 01/31/2013] [Indexed: 01/02/2023]
Abstract
Studies on the effects of nanomaterial exposure in mammals are limited, and new methods for rapid risk assessment of nanomaterials are urgently required. The utility of Caenorhabditis elegans cultured in axenic liquid media was evaluated as an alternative in vivo model for the purpose of screening nanomaterials for toxic effects. Spherical silver nanoparticles of 10 nm diameter (10nmAg) were used as a test material, and ionic silver from silver acetate as a positive control. Silver uptake and localization, larval growth, morphology and DNA damage were utilized as endpoints for toxicity evaluation. Confocal reflection analysis indicated that 10nmAg localized to the lumen and tissues of the digestive tract of C. elegans. 10nmAg at 10 µg ml(-1) reduced the growth of C. elegans larvae, and induced oxidative damage to DNA as measured by 8-OH guanine levels. Consistent with previously published studies using mammalian models, ionic silver suppressed growth in C. elegans larvae to a greater extent than 10nmAg. Our data suggest that medium-throughput growth screening and DNA damage analysis along with morphology assessments in C. elegans could together provide powerful tools for rapid toxicity screening of nanomaterials.
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Affiliation(s)
- Piper Reid Hunt
- United States Food and Drug Administration, Center for Food Safety and Applied Nutrition, Office of Applied Research and Safety Assessment, Division of Toxicology, Laurel, MD 20708, USA.
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Li Y, Gao S, Jing H, Qi L, Ning J, Tan Z, Yang K, Zhao C, Ma L, Li G. Correlation of chemical acute toxicity between the nematode and the rodent. Toxicol Res (Camb) 2013. [DOI: 10.1039/c3tx50039j] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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