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Old Challenges Meet Novel Tools: Prospects and Aims for Next-Generation Ecotoxicologists and Environmental Toxicologists

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A special issue of International Journal of Environmental Research and Public Health (ISSN 1660-4601). This special issue belongs to the section "Environmental Health".

Deadline for manuscript submissions: closed (31 October 2019) | Viewed by 19969

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Special Issue Editor

Dr. Pedro M. Costa

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Guest Editor

1. Associate Laboratory i4HB—Institute for Health and Bioeconomy, Faculdade de Ciências e Tecnologia, Universidade NOVA, 2825 Caparica, Portugal
2. UCIBIO—Applied Molecular Biosciences Unit, Departamento de Ciências da Vida, Faculdade de Ciências e Tecnologia, Universidade NOVA, 2825 Caparica, Portugal
Interests: toxicology and environmental toxicology; aquatic biology; genotoxicology; marine toxins and biotechnology; toxicopathology; molecular toxicology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Environmental Toxicology and Ecotoxicology have come a long way since Clair Patterson’s and Rachel Carson’s “heads up”, back in the 1960s, sent shockwaves worldwide. After decades of struggle leaping the boundaries between science, public awareness and the court-of-law, the notion that the discharge of hazardous chemicals into the environment has major implications to wildlife, economy and human health is now firmly rooted. This leads to policy, guidelines and monitoring programs that now reach beyond the mere regional scope. However, the extraordinary pace of our advancing society is a continuous source of new challenges that environmental scientists must keep up with. Emerging pollutants, such as pharmaceuticals and new pesticides, nanomaterials and complex blends of all sorts of noxious chemicals and their metabolites, are just few examples. As we become aware that traditional toxicity testing and biomonitoring versus biomarker approaches are hardly able to objectively determine risk and causality in realistic scenarios (therefore complex), experts are revolutionizing the field by incorporating frontier concepts like ‘Exposome’, ‘Systems Biology’ and ‘Adverse Outcome Pathways’. Consequently, improved methods to determine and validate the presence of chemicals in the environment, high-content screening and bioinformatics are pushing environmental science into its next-generation. We call on specialists worldwide for contributions that integrate such state-of-the-art concepts and technology to respond to the ever-evolving challenges laid before ecotoxicologists and environmental toxicologists.

Dr. Pedro M. Costa
Guest Editor

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2500 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

Emerging and traditional pollutants
Toxicant mixtures
Ecosystem and human health
Environmental Toxicology and Ecotoxicology
Adverse outcome pathways
Next-generation sequencing
Systems Toxicology
‘Omics’
Bioinformatics
Integrated environmental risk assessment

Published Papers (5 papers)

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Research

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11 pages, 1065 KiB

Open AccessArticle

Oxidative Stress Effects of Soluble Sulfide on Human Hepatocyte Cell Line LO2

by Ying Shao, Zhongli Chen and Lingling Wu

Int. J. Environ. Res. Public Health 2019, 16(9), 1662; https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph16091662 - 13 May 2019

Cited by 14 | Viewed by 3078

Abstract

Soluble sulfide is well known for its toxicity and corrosion for hundreds of years. However, recent studies have demonstrated that hydrogen sulfide (H₂S)—a novel gasotransmitter—supports a critical role during neuromodulation, cell proliferation, and cardioprotection for organisms. In particular, soluble sulfide plays multifaceted signaling functions in mammals during oxidative stress processes. However, the specific molecular regulation of soluble sulfide during oxidative stress remains unclear. In this study, Na₂S was implemented as a soluble sulfide donor to expose LO2 cells. The 3-(4,5-dimethylthiazolyl-2),-2,5-diphenyltetrazolium bromide (MTT) assay, hydroxyl radical assay, superoxide dismutase (SOD) assay, and glutathione peroxidase (GSH-PX) assay were applied to analyze cytotoxicity, hydroxyl radical levels, SOD and GSH-Px activities, respectively. Soluble sulfide at a concentration 0.01–1.0 mM/L resulted in a marked and concentration-dependent reduction of LO2 cell viability. At low concentrations, sulfide solutions increased SOD activity and GSH-Px activity of LO2 after 24 h exposure, exhibiting a clear hormesis-effect and indicating the protective ability of soluble sulfide against oxidative stress. The decline in SOD and GSH-Px and the increase in hydroxyl radical (0.08–1.0 mM/L) suggested that oxidative damage could be a possible mechanism for sulfide-induced cytotoxicity. Full article

(This article belongs to the Special Issue Old Challenges Meet Novel Tools: Prospects and Aims for Next-Generation Ecotoxicologists and Environmental Toxicologists)

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12 pages, 3277 KiB

Open AccessArticle

Age Differences in the Relationship between Secondhand Smoke Exposure and Risk of Metabolic Syndrome: A Meta-Analysis

by Hui-Jian Chen, Gai-Ling Li, Ao Sun, Dang-Sheng Peng, Wan-Xia Zhang and You-E Yan

Int. J. Environ. Res. Public Health 2019, 16(8), 1409; https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph16081409 - 19 Apr 2019

Cited by 19 | Viewed by 3579

Abstract

Secondhand smoke (SHS), a common environmental exposure factor, has become a serious public health problem. Metabolic syndrome is another worldwide clinical challenge. Our study tried to determine the age differences in the relationship between SHS and the risk of metabolic syndrome. Studies were searched in PubMed and Web of Science from 11 November to 30 November 2018. Eighteen studies were finally included based on inclusion and exclusion criteria. The relationship between SHS and the risk indicators of metabolic syndrome was analyzed. The weighted mean difference (WMD) of fasting plasma glucose (FPG), insulin, body mass index (BMI), and waist circumference (WC), and the standard mean difference (SMD) of total cholesterol, triglycerides, and low- and high-density lipoprotein-cholesterol (LDL-C, HDL-C) were calculated in a meta-analysis. SHS was positively associated with the level of insulin and WC. According to the subgroup analysis based on age difference, SHS was positively associated with FPG in the upper age group, and positively associated with LDL-C and negatively associated with HDL-C in the lower age group. BMI showed a more obvious positive correlation in the adults group than in the children and the teenagers group. In conclusion, the association of metabolic syndrome with SHS varies with age. When exposed to SHS, older people may be more susceptible to glucose metabolic disorder, but younger people may be more susceptible to lipid metabolic disorder. Full article

(This article belongs to the Special Issue Old Challenges Meet Novel Tools: Prospects and Aims for Next-Generation Ecotoxicologists and Environmental Toxicologists)

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11 pages, 894 KiB

Open AccessArticle

Are Our Farm Workers in Danger? Genetic Damage in Farmers Exposed to Pesticides

by Ana Flavia Marcelino, Catia Cappelli Wachtel and Nédia de Castilhos Ghisi

Int. J. Environ. Res. Public Health 2019, 16(3), 358; https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph16030358 - 27 Jan 2019

Cited by 38 | Viewed by 5036

Abstract

Modern agriculture, practiced after the “green revolution” worldwide, aims to maximize production in order to provide food for the growing world population. Thus, farmers are required to modernize their practices through the mechanization of land use and, above all, the use of chemical pesticides to control agricultural pests. However, in addition to combating the target pest, chemical pesticides indirectly affect a wide range of species, including humans, leading to health damage. Among the main problems caused by the use of pesticides is the genotoxicity caused by chronic exposure. The present study aims to verify the occurrence of genetic damage in farmers who are occupationally exposed to agrochemicals compared to people of other professions that do not use toxic substances (control group). The research was conducted with 36 male participants (18 farmers and 18 control group, ages 24–71 for the farmer group and 22–61 for the control group). The comet assay and micronucleus test results revealed a higher rate of genetic damage in the group of farmers than in the control group. A questionnaire answered by the farmers showed that the Personal Protect Equipment (PPE) is used incorrectly or not used. In summary, our results indicate that farmers are exposed to occupational hazards. To mitigate this risk, we conducted awareness campaigns to notify the farmers of the risks and highlight the importance of using PPE correctly. Intensive efforts and training are thus required to build an awareness of safety practices and change the attitudes of farm workers in the hope of preventing harmful environmental and anthropogenic effects. Full article

(This article belongs to the Special Issue Old Challenges Meet Novel Tools: Prospects and Aims for Next-Generation Ecotoxicologists and Environmental Toxicologists)

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14 pages, 2493 KiB

Open AccessArticle

The Increase of ROS Caused by the Interference of DEHP with JNK/p38/p53 Pathway as the Reason for Hepatotoxicity

by Yuanyuan Huang, Chuancheng Wu, Youbin Ye, Jingwen Zeng, Jianlin Zhu, Yuchen Li, Wenxiang Wang, Wenchang Zhang, Yiqin Chen, Hongyuan Xie, Hongmei Zhang and Jin Liu

Int. J. Environ. Res. Public Health 2019, 16(3), 356; https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph16030356 - 27 Jan 2019

Cited by 41 | Viewed by 4056

Abstract

As the most commonly used plasticizer, Di-(2-ethylhexyl)-phthalate (DEHP) exists everywhere in the environment due to the widespread use of polyvinyl chloride (PVC) in human life, and it is also a recognized environmental pollutant. Studies have proved the hepatotoxicity of DEHP, however the mechanism has not been adequately explored, especially the role of the reactive oxygen species (ROS) in it. In the present study, 21 day-old ICR mice were administered DEHP with dose of 0, 125, 250, and 375 mg/kg/day for 28 days by intragastrical gavage. After contamination, histopathology displayed that liver tissue were damaged mildly with the effect of DEHP; a significant increase of the serum liver function index (including aspartate transaminase (AST) and alanine transaminase (ALT)) were observed. Additionally, the level of lipid peroxidation markedly rise, especially ROS and malondialdehyde (MDA), but the activation of superoxide dismutase (SOD) was obviously decreased in mice liver. In addition, DEHP promoted the phosphorylation of JNK and p38MAPK proteins in mice liver, as well as increased the expression of p53 protein and decreased the level of DNA methylation in the p53 gene promoter region. These results indicated that the hepatotoxicity of mice caused by DEHP may be through activating the JNK/p38MAPK/p53 signaling pathway and further promoting the generation of ROS to induce lipid peroxidation in liver, and the role of DNA methylation may be inevitable. Full article

(This article belongs to the Special Issue Old Challenges Meet Novel Tools: Prospects and Aims for Next-Generation Ecotoxicologists and Environmental Toxicologists)

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Review

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16 pages, 3687 KiB

Open AccessReview

The State-of-the Art of Environmental Toxicogenomics: Challenges and Perspectives of “Omics” Approaches Directed to Toxicant Mixtures

by Carla Martins, Kristian Dreij and Pedro M. Costa

Int. J. Environ. Res. Public Health 2019, 16(23), 4718; https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph16234718 - 26 Nov 2019

Cited by 39 | Viewed by 3820

Abstract

The last decade witnessed extraordinary advances in “omics” methods, particularly transcriptomics, proteomics and metabolomics, enabling toxicologists to integrate toxicokinetics and toxicodynamics with mechanistic insights on the mode-of-action of noxious chemicals, single or combined. The toxicology of mixtures is, nonetheless, a most challenging enterprise, especially for environmental toxicologists and ecotoxicologists, who invariably deal with chemical mixtures, many of which contain unknowns. Despite costs and demanding computations, the systems toxicology framework, of which “omics” is a major component, endeavors extracting adverse outcome pathways for complex mixtures. Still, the interplay between the multiple components of gene expression and cell metabolism tends to be overlooked. As an example, the proteome allocates DNA methyltransferases whose altered transcription or loss of function by action of chemicals can have a global impact on gene expression in the cell. On the other hand, chemical insult can produce reactive metabolites and radicals that can intercalate or bind to DNA as well as to enzymes and structural proteins, compromising their activity. These examples illustrate the importance of exploring multiple “omes” and the purpose of “omics” and multi-“omics” for building truly predictive models of hazard and risk. Here we will review the state-of-the-art of toxicogenomics highlighting successes, shortcomings and perspectives for next-generation environmental toxicologists. Full article

(This article belongs to the Special Issue Old Challenges Meet Novel Tools: Prospects and Aims for Next-Generation Ecotoxicologists and Environmental Toxicologists)

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