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Shoman N, Solomonova E, Akimov A, Rylkova O, Mansurova I. Activation of stress reactions in the dinophyte microalga Prorocentrum cordatum as a consequence of the toxic effect of ZnO nanoparticles and zinc sulfate. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2024; 272:106964. [PMID: 38781690 DOI: 10.1016/j.aquatox.2024.106964] [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: 03/20/2024] [Revised: 05/16/2024] [Accepted: 05/17/2024] [Indexed: 05/25/2024]
Abstract
According to the results of the experimental study, the main regularities of changes in morphological, structural-functional and fluorescent indices of P. cordatum were established when zinc oxide nanoparticles ZnO NPs (0.3-6.4 mg L-1) and Zn in form of salt (0.09-0.4 mg L-1) were added to the medium. The studied pollutants have cytotoxic (growth inhibition, development of oxidative stress, destruction of cytoplasmic organelles, disorganization of mitochondria) and genotoxic (changes in the morphology of nuclei, chromatin condensation) effects on microalgae, affecting almost all aspects of cell functioning. Despite the similar mechanism of action of zinc sulfate and ZnO NPs on P. cordatum cells, the negative effect of ZnO NPs is also due to the inhibition of photosynthetic activity of cells (significant decrease in the maximum quantum yield of photosynthesis and electron transport rate), reduction of chlorophyll concentration from 3.5 to 1.8 pg cell-1, as well as mechanical effect on cells: deformation and damage of cell membranes, aggregation of NPs on the cell surface. Apoptosis-like signs of cell death upon exposure to zinc sulfate and ZnO NPs were identified by flow cytometry and laser scanning confocal microscopy methods: changes in cell morphology, cytoplasm retraction, development of oxidative stress, deformation of nuclei, and disorganization of mitochondria. It was shown that the first signs of cell apoptosis appear at 0.02 mg L-1 Zn and 0.6 mg L-1 ZnO NPs after 72 h of exposure. At higher concentrations of pollutants, a dose-dependent decrease in algal enzymatic activity (up to 5 times relative to control) and mitochondrial membrane potential (up to 4 times relative to control), and an increase in the production of reactive oxygen species (up to 4-5 times relative to control) were observed. The results of the presented study contribute to the disclosure of fundamental mechanisms of toxic effects of pollutants and prediction of ways of phototrophic microorganisms reaction to this impact.
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Affiliation(s)
- Natalia Shoman
- A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS, 2, Nakhimov Ave., Sevastopol, Russia.
| | - Ekaterina Solomonova
- A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS, 2, Nakhimov Ave., Sevastopol, Russia
| | - Arkady Akimov
- A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS, 2, Nakhimov Ave., Sevastopol, Russia
| | - Olga Rylkova
- A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS, 2, Nakhimov Ave., Sevastopol, Russia
| | - Irina Mansurova
- A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS, 2, Nakhimov Ave., Sevastopol, Russia
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Cotelle S, Masfaraud JF, Curie T, Lafay L. A proposal for new genotoxic and cytotoxic endpoints to assess chemical effects on the red algae Ceramium tenuicorne. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024:10.1007/s11356-024-33634-x. [PMID: 38767794 DOI: 10.1007/s11356-024-33634-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Accepted: 05/06/2024] [Indexed: 05/22/2024]
Abstract
Macroalgae provide key contributions to aquatic ecosystems, including their role as primary producers and the provision of biotopes for marine organisms, fish spawning, and fish nurseries. The aim of this study was to evaluate the feasibility of a micronucleus test and a comet assay in Ceramium tenuicorne, a red macroalga. This alga is widely distributed in marine ecosystems and brackish waters, and is therefore a potential bioindicator of the effects of anthropogenic pollution in these ecosystems. Unfortunately, the two genotoxicity tests evaluated were not suitable for this alga because the nuclei are generally very small (between 2 and 10 µm), are variable in size, and there may be several nuclei in each cell (between 1 and 5 in our observations). However, the present study allowed us to define conditions for observing these algal cells and optimizing the choice of DNA dye (orcein), cell fixation solution (Carnoy's solution), and hydrolysis step (HCl, 1200 mmol/L solution for 1 min). This research allowed us to propose two genotoxicity and cytotoxicity endpoints for assessing chemical effects on the algal cells: counting of nuclei in cortical cell areas, and the frequency of axial cells in mitosis. These two criteria were measured after exposing C. tenuicorne to two reference substances: cadmium chloride and maleic hydrazide, and we highlight the effects from 1 × 10-5 M of CdCl2 and 5 × 10-5 M of maleic hydrazide.
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Affiliation(s)
- Sylvie Cotelle
- LIEC, CNRS, Université de Lorraine, 57000, Metz, France.
| | | | - Thomas Curie
- LIEC, CNRS, Université de Lorraine, 57000, Metz, France
| | - Léo Lafay
- EDF Recherche & Développement - Laboratoire National d'Hydraulique et Environnement, 6 Quai Watier, 78400, Chatou, France
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Zhan D, Liu Y, Yu N, Hao C. Photosynthetic response of Chlamydomonas reinhardtii and Chlamydomonas sp. 1710 to zinc toxicity. Front Microbiol 2024; 15:1383360. [PMID: 38650883 PMCID: PMC11033396 DOI: 10.3389/fmicb.2024.1383360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2024] [Accepted: 03/25/2024] [Indexed: 04/25/2024] Open
Abstract
Zinc (Zn) is an essential trace element but can lead to water contamination and ecological deterioration when present in excessive amounts. Therefore, investigating the photosynthetic response of microalgae to Zn stress is of great significance. In this study, we assessed the photosynthetic responses of neutrophilic Chlamydomonas reinhardtii and acidophilic Chlamydomonas sp. 1710 to Zn exposure for 96 h. The specific growth rate (μ), chlorophyll-a (Chl-a) content, and chlorophyll fluorescence parameters were determined. The results demonstrated that Chlamydomonas sp. 1710 was much more tolerant to Zn than C. reinhardtii, with the half-maximal inhibitory concentration (IC50) values of 225.4 mg/L and 23.4 mg/L, respectively. The μ and Chl-a content of C. reinhardtii decreased in the presence of 15 mg/L Zn, whereas those of Chlamydomonas sp. 1710 were unaffected by as high as 100 mg/L Zn. Chlorophyll fluorescence parameters indicated that the regulation of energy dissipation, including non-photochemical quenching, played a crucial role in Zn stress resistance for both Chlamydomonas strains. However, in the case of C. reinhardtii, non-photochemical quenching was inhibited by 5 mg/L Zn in the first 48 h, whereas for Chlamydomonas sp. 1710, it remained unaffected under 100 mg/L Zn. Chlamydomonas sp. 1710 also exhibited a 20 times stronger capacity for regulating the electron transfer rate than C. reinhardtii under Zn stress. The light energy utilization efficiency (α) of Chlamydomonas sp. 1710 had the most highly non-linear correlation with μ, indicating the energy utilization and regulation process of Chlamydomonas sp. 1710 was well protected under Zn stress. Collectively, our findings demonstrate that the photosystem of Chlamydomonas sp. 1710 is much more resilient and tolerant than that of C. reinhardtii under Zn stress.
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Affiliation(s)
- Di Zhan
- Center for Geomicrobiology and Biogeochemistry Research, State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing, China
- School of Earth Sciences and Resources, China University of Geosciences, Beijing, China
| | - Yue Liu
- Center for Geomicrobiology and Biogeochemistry Research, State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing, China
- School of Water Resources and Environment, China University of Geosciences, Beijing, China
| | - Na Yu
- Center for Geomicrobiology and Biogeochemistry Research, State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing, China
- School of Water Resources and Environment, China University of Geosciences, Beijing, China
| | - Chunbo Hao
- Center for Geomicrobiology and Biogeochemistry Research, State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing, China
- School of Water Resources and Environment, China University of Geosciences, Beijing, China
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Solomonova E, Shoman N, Akimov A, Rylkova O, Meger Y. Application of confocal microscopy and flow cytometry to identify physiological responses of Prorocentrum micans to the herbicide glyphosate. MARINE ENVIRONMENTAL RESEARCH 2024; 196:106417. [PMID: 38394976 DOI: 10.1016/j.marenvres.2024.106417] [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: 10/27/2023] [Revised: 01/25/2024] [Accepted: 02/19/2024] [Indexed: 02/25/2024]
Abstract
The physiological response of the dinoflagellate P. micans to the effect of the herbicide glyphosate at a concentration of 25-200 μg L-1 was evaluated. It has been shown that P. micans is able to grow due to the consumption of dissolved organic phosphorus formed as a result of the mineralization of glyphosate by bacteria. The addition of glyphosate to the medium inhibits the photosynthetic activity of cells; there is a pronounced inhibition of the relative electron transfer rate along the electron transport chain and the maximum quantum efficiency of the use of light energy. Morphological and ultrastructural changes in P. micans cells were evaluated at sublethal (150 μg L-1) and lethal (200 μg L-1) glyphosate concentrations. It has been shown that at a herbicide concentration of 150 μg L-1, the first signs of apoptosis appear in most P. micans cells: a decrease in lateral light scattering, cytoplasmic retraction, partial destruction of cytoplasmic organelles, a change in the morphology of nuclei, mitochondria, a change in the potential of mitochondrial membranes, and a decrease in the autofluorescence of chlorophyll in cells. At a glyphosate concentration of 200 μg L-1, P. micans showed signs of a late stage of apoptosis: violation of the integrity of intracellular organelles and chromatin organization, fragmentation of nuclei, condensation of cytoplasm, disorganization of chloroplasts in the cells, and the release of cell contents beyond the cell membrane. The effectiveness of using flow cytometry and laser scanning confocal microscopy methods for identifying signs and stages of cell apoptosis when exposed to glyphosate is discussed.
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Affiliation(s)
- Ekaterina Solomonova
- A.O. Kovalevsky Institute of Biology of the Southern Seas of the Russian Academy of Sciences, 2, Nahimov Avе., Sevastopol, Russian Federation.
| | - Natalia Shoman
- A.O. Kovalevsky Institute of Biology of the Southern Seas of the Russian Academy of Sciences, 2, Nahimov Avе., Sevastopol, Russian Federation
| | - Arkady Akimov
- A.O. Kovalevsky Institute of Biology of the Southern Seas of the Russian Academy of Sciences, 2, Nahimov Avе., Sevastopol, Russian Federation
| | - Olga Rylkova
- A.O. Kovalevsky Institute of Biology of the Southern Seas of the Russian Academy of Sciences, 2, Nahimov Avе., Sevastopol, Russian Federation
| | - Yakov Meger
- Sevastopol State University, 299053, Universitetskaya Street, 33, Sevastopol, Russian Federation
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Fayaz T, Rana SS, Goyal E, Ratha SK, Renuka N. Harnessing the potential of microalgae-based systems for mitigating pesticide pollution and its impact on their metabolism. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 357:120723. [PMID: 38565028 DOI: 10.1016/j.jenvman.2024.120723] [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: 12/30/2023] [Revised: 02/28/2024] [Accepted: 03/19/2024] [Indexed: 04/04/2024]
Abstract
Due to increased pesticide usage in agriculture, a significant concentration of pesticides is reported in the environment that can directly impact humans, aquatic flora, and fauna. Utilizing microalgae-based systems for pesticide removal is becoming more popular because of their environmentally friendly nature, ability to degrade pesticide molecules into simpler, nontoxic molecules, and cost-effectiveness of the technology. Thus, this review focused on the efficiency, mechanisms, and factors governing pesticide removal using microalgae-based systems and their effect on microalgal metabolism. A wide range of pesticides, like atrazine, cypermethrin, malathion, trichlorfon, thiacloprid, etc., can be effectively removed by different microalgal strains. Some species of Chlorella, Chlamydomonas, Scenedesmus, Nostoc, etc., are documented for >90% removal of different pesticides, mainly through the biodegradation mechanism. The antioxidant enzymes such as ascorbate peroxidase, superoxide dismutase, and catalase, as well as the complex structure of microalgae cell walls, are mainly involved in eliminating pesticides and are also crucial for the defense mechanism of microalgae against reactive oxygen species. However, higher pesticide concentrations may alter the biochemical composition and gene expression associated with microalgal growth and metabolism, which may vary depending on the type of strain, the pesticide type, and the concentration. The final section of this review discussed the challenges and prospects of how microalgae can become a successful tool to remediate pesticides.
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Affiliation(s)
- Tufail Fayaz
- Algal Biotechnology Laboratory, Department of Botany, Central University of Punjab, Bathinda, 151401, India
| | - Soujanya S Rana
- Algal Biotechnology Laboratory, Department of Botany, Central University of Punjab, Bathinda, 151401, India
| | - Esha Goyal
- Algal Biotechnology Laboratory, Department of Botany, Central University of Punjab, Bathinda, 151401, India
| | - Sachitra Kumar Ratha
- Algology Laboratory, CSIR-National Botanical Research Institute, Lucknow, 226001, India
| | - Nirmal Renuka
- Algal Biotechnology Laboratory, Department of Botany, Central University of Punjab, Bathinda, 151401, India.
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Wang M, Wang WX. Infiltration of freshwater food chain by nanoplastics: An examination of trophic transfer and biological impact. CHEMOSPHERE 2023; 345:140541. [PMID: 37890797 DOI: 10.1016/j.chemosphere.2023.140541] [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: 09/09/2023] [Revised: 10/20/2023] [Accepted: 10/24/2023] [Indexed: 10/29/2023]
Abstract
The contamination of freshwater by nanoplastics (NPs) poses a significant threat to various organisms. However, the influence of food factors on the NPs toxicity and the associated risks to water safety remains poorly understood. In this study, we employed highly fluorescent NPs incorporating aggregation-induced emission fluorogens to quantify and visualize the interactions of NPs with freshwater phytoplanktonic alga Chlamydomonas reinhardtii and zooplankton Daphnia magna, including the uptake of NPs by algae and daphnids, as well as gut environment responses through both waterborne and foodborne routes. NPs at environmentally relevant concentrations were capable of aggregating and internalizing in planktonic algae, thus permeating the food chain and potentially causing ecological risks. Notably, positively charged NPs exhibited greater infiltration than the negatively charged NPs. Our findings indicated that NPs had a greater tendency to accumulate in Daphnia via the food chain rather than through direct exposure to water. This was attributed to the loss of selectivity, suggesting a potential mechanism for NP accumulation in aquatic food chains. However, daphnids exposed to NPs through waterborne route exhibited more gut pH acidification, esterase activity, and gut inflammation compared to those exposed via the foodborne route. Moreover, chronic exposure to NPs through waterborne routes significantly disrupted the growth, molting, and reproduction of Daphnia compared to the foodborne group. These findings provided valuable insights into the complexities of plastic pollution on primary trophic levels in aquatic environments.
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Affiliation(s)
- Mengjing Wang
- School of Energy and Environment and State Key Laboratory of Marine Pollution, City University of Hong Kong, Kowloon, Hong Kong; Research Centre for the Oceans and Human Health, City University of Hong Kong Shenzhen Research Institute, Shenzhen, 518057, China
| | - Wen-Xiong Wang
- School of Energy and Environment and State Key Laboratory of Marine Pollution, City University of Hong Kong, Kowloon, Hong Kong; Research Centre for the Oceans and Human Health, City University of Hong Kong Shenzhen Research Institute, Shenzhen, 518057, China.
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7
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Seoane M, Conde-Pérez K, Esperanza M, Cid Á, Rioboo C. Unravelling joint cytotoxicity of ibuprofen and oxytetracycline on Chlamydomonas reinhardtii using a programmed cell death-related biomarkers panel. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2023; 257:106455. [PMID: 36841069 DOI: 10.1016/j.aquatox.2023.106455] [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: 01/11/2023] [Revised: 02/16/2023] [Accepted: 02/19/2023] [Indexed: 06/18/2023]
Abstract
Pharmaceutical active compounds (PhACs) are emerging contaminants that pose a growing concern due to their ubiquitous presence and harmful impact on aquatic ecosystems. Among PhACs, the anti-inflammatory ibuprofen (IBU) and the antibiotic oxytetracycline (OTC) are two of the most used compounds whose presence has been reported in different aquatic environments worldwide. However, there is still scarce information about the cellular and molecular alterations provoked by IBU and OTC on aquatic photosynthetic microorganisms as microalgae, even more if we refer to their potential combined toxicity. To test the cyto- and genotoxicity provoked by IBU, OTC and their binary combination on Chlamydomonas reinhardtii, a flow cytometric panel was performed after 24 h of single and co-exposure to both contaminants. Assayed parameters were cell vitality, metabolic activity, intracellular ROS levels, and other programmed cell death (PCD)-related biomarkers as cytoplasmic and mitochondrial membrane potentials and caspase-like and endonuclease activities. In addition, a nuclear DNA fragmentation analysis by comet assay was carried out. For most of the parameters analysed (vitality, metabolic activity, cytoplasmic and mitochondrial membrane potentials, and DNA fragmentation) the most severe damages were observed in the cultures exposed to the binary mixture (IBU+OTC), showing a joint cyto- and genotoxicity effect. Both PhACs and their mixture caused a remarkable decrease in cell proliferation and metabolic activity and markedly increased intracellular ROS levels, parallel to a noticeable depolarization of cytoplasmic and mitochondrial membranes. Moreover, a strong increase in both caspase and endonuclease activities as well as a PCD-related loss of nuclear DNA integrity was observed in all treatments. Results analysis showed that the PhACs caused cell death on this non-target organism, involving mitochondrial membrane depolarization, enhanced ROS production and activation of PCD process. Thus, PCD should be an applicable toxicological target for unraveling the harmful effects of co-exposure to PhACs in aquatic organisms as microalgae.
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Affiliation(s)
- Marta Seoane
- Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, A Coruña 15071, Spain
| | - Kelly Conde-Pérez
- Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, A Coruña 15071, Spain
| | - Marta Esperanza
- Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, A Coruña 15071, Spain
| | - Ángeles Cid
- Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, A Coruña 15071, Spain
| | - Carmen Rioboo
- Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, A Coruña 15071, Spain.
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Tamayo-Belda M, Pérez-Olivares AV, Pulido-Reyes G, Martin-Betancor K, González-Pleiter M, Leganés F, Mitrano DM, Rosal R, Fernández-Piñas F. Tracking nanoplastics in freshwater microcosms and their impacts to aquatic organisms. JOURNAL OF HAZARDOUS MATERIALS 2023; 445:130625. [PMID: 37056024 DOI: 10.1016/j.jhazmat.2022.130625] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 12/14/2022] [Accepted: 12/16/2022] [Indexed: 06/19/2023]
Abstract
In this work, we used palladium-doped polystyrene NPLs (PS-NPLs with a primary size of 286 ± 4 nm) with an irregular surface morphology which allowed for particle tracking and evaluation of their toxicity on two primary producers (cyanobacterium, Anabaena sp. PCC7120 and green algae, Chlamydomonas reinhardtii) and one primary consumer (crustacean, Daphnia magna). the concentration range for Anabaena and C. reinhardtii was from 0.01 to 1000 mg/L and for D. magna, the range was from 7.5 to 120 mg/L.EC50 s ranged from 49 mg NPLs/L for D. magna (48hEC50 s) to 248 mg NPLs/L (72hEC50 s for C. reinhardtii). PS-NPLs induced dose-dependent reactive oxygen species overproduction, membrane damage and metabolic alterations. To shed light on the environmental fate of PS-NPLs, the short-term distribution of PS-NPLs under static (using lake water and sediments) and stirring (using river water and sediments) conditions was studied at laboratory scale. The results showed that most NPLs remained in the water column over the course of 48 h. The maximum percentage of settled particles (∼ 30 %) was found under stirring conditions in comparison with the ∼ 10 % observed under static ones. Natural organic matter increased the stability of the NPLs under colloidal state while organisms favored their settlement. This study expands the current knowledge of the biological effects and fate of NPLs in freshwater environments.
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Affiliation(s)
- Miguel Tamayo-Belda
- Department of Biology, Faculty of Science, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | | | - Gerardo Pulido-Reyes
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, Ueberlandstrasse 133, 8600 Duebendorf, Switzerland; Department of Environment and Agronomy, Spanish National Institute for Agricultural and Food Research and Technology (INIA-CSIC), Crta. de la Coruña, km 7.5, 28040 Madrid, Spain
| | - Keila Martin-Betancor
- Department of Biology, Faculty of Science, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - Miguel González-Pleiter
- Department of Biology, Faculty of Science, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - Francisco Leganés
- Department of Biology, Faculty of Science, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - Denise M Mitrano
- Environmental Systems Science Department, ETH Zurich, 8092 Zurich, Switzerland
| | - Roberto Rosal
- Department of Chemical Engineering, Universidad de Alcalá, E-28871 Alcalá de Henares, Madrid, Spain
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Lee J, Hong S, An SA, Khim JS. Methodological advances and future directions of microalgal bioassays for evaluation of potential toxicity in environmental samples: A review. ENVIRONMENT INTERNATIONAL 2023; 173:107869. [PMID: 36905773 DOI: 10.1016/j.envint.2023.107869] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 03/04/2023] [Accepted: 03/05/2023] [Indexed: 06/18/2023]
Abstract
Microalgal bioassays are widely applied to evaluate the potential toxicity of various persistent toxic substances in environmental samples due to multiple advantages, including high sensitivity, short test duration, and cost-effectiveness. Microalgal bioassay is gradually developing in method, and the scope of application to environmental samples is also expanding. Here, we reviewed the published literature on microalgal bioassays for environmental assessments, focusing on types of samples, sample preparation methods, and endpoints, and highlighted key scientific advancements. Bibliographic analysis was performed with the keywords 'microalgae' and 'toxicity' or 'bioassay', and 'microalgal toxicity'; 89 research articles were selected and reviewed. Traditionally, most studies implementing microalgal bioassays focused on water samples (44%) with passive samplers (38%). Studies using the direct exposure method (41%) of injecting microalgae into sampled water mainly evaluated toxic effects by growth inhibition (63%). Recently, various automated sampling techniques, in situ bioanalytical methods with multiple endpoints, and targeted and non-targeted chemical analyses have been applied. More research is needed to identify causative toxicants affecting microalgae and to quantify the cause-effect relationships. This study provides the first comprehensive overview of recent advances in microalgal bioassays performed with environmental samples, suggesting future research directions based on current understanding and limitations.
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Affiliation(s)
- Junghyun Lee
- School of Earth and Environmental Sciences & Research Institute of Oceanography, Seoul National University, Seoul 08826, Republic of Korea
| | - Seongjin Hong
- Department of Marine Environmental Science, Chungnam National University, Daejeon 34134, Republic of Korea.
| | - Seong-Ah An
- Department of Marine Environmental Science, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Jong Seong Khim
- School of Earth and Environmental Sciences & Research Institute of Oceanography, Seoul National University, Seoul 08826, Republic of Korea.
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10
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Li Y, Wang WX. Internalization of the Metal-Organic Framework MIL-101(Cr)-NH 2 by a Freshwater Alga and Transfer to Zooplankton. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:118-127. [PMID: 36503235 DOI: 10.1021/acs.est.2c03780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The common metal-organic framework (MOF) MIL-101(Cr)-NH2 has attracted considerable attention due to its great potential applications in the environmental field. Nevertheless, its behavior and fate in aquatic systems are unknown. This study quantified and visualized the interactions of MIL-101(Cr)-NH2 with the freshwater phytoplanktonic alga Chlamydomonas reinhardtii and its potential trophic transfer to zooplankton. The unicellular alga absorbed and accumulated the MOF by surface attachment, forming agglomerates and eventually cosettling out from water. Bioimaging revealed that MIL-101(Cr)-NH2 was internalized by the algal cells and mainly occurred in the pyrenoid. Without algae in a freshwater system, MIL-101(Cr)-NH2 was ingested by Daphnia magna, showing steadily increasing concentrations approaching 1-9% of dry body weight. Addition of algae substantially suppressed D. magna uptake of MIL-101(Cr)-NH2 by 63.8-97.9%. Such inhibition could be explained by the competitive uptake of MOF by the algae and the inductive effects of algal food on MOF elimination by D. magna. The MOF (≤1 mg/L) ingested by D. magna was centered in the gut regions, whereas large MOF or algae-MOF aggregates were adsorbed onto the carapace and appendages, including the antennae, at 10 mg/L. Overall, the algae were the major targets for MIL-101(Cr)-NH2, with nearly all algal cells settling out at 10 mg/L within 24 h. The possibility of trophic transfer of MIL-101(Cr)-NH2 to D. magna in aquatic systems with algae present was limited due to its low accumulation potential and short retention time in D. magna.
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Affiliation(s)
- Yiling Li
- School of Energy and Environment and State Key Laboratory of Marine Pollution, City University of Hong Kong, Kowloon 999077, Hong Kong SAR, People's Republic of China
- Research Centre for the Oceans and Human Health, City University of Hong Kong Shenzhen Research Institute, Shenzhen 518057, People's Republic of China
| | - Wen-Xiong Wang
- School of Energy and Environment and State Key Laboratory of Marine Pollution, City University of Hong Kong, Kowloon 999077, Hong Kong SAR, People's Republic of China
- Research Centre for the Oceans and Human Health, City University of Hong Kong Shenzhen Research Institute, Shenzhen 518057, People's Republic of China
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Bai F, Jia Y, Li J, Wu Z, Li L, Song L. Paraquat induces different programmed cell death patterns in Microcystis aeruginosa and Chlorella luteoviridis. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 249:114429. [PMID: 36516625 DOI: 10.1016/j.ecoenv.2022.114429] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 12/10/2022] [Accepted: 12/11/2022] [Indexed: 06/17/2023]
Abstract
Although programmed cell death (PCD) has been reported in phytoplankton, knowledge of the characterization of the PCD pathway and cascade process in different phytoplankton species is still limited. In this study, PCD progression in cyanobacterium Microcystis aeruginosa and green algae Chlorella luteoviridis by paraquat-induced oxidative stress was monitored. The results showed that paraquat-induced PCD in the two species belonged to the caspase-dependent pathway. Dose- and time-dependent PCD characteristics in the two strains under paraquat included the increase in caspase-like activity, DNA fragmentation, and chromatin condensation. However, the signaling pathway and cascade events of PCD in M. aeruginosa and C. luteoviridis differed. In M. aeruginosa, the free Ca2+ concentration was rapidly increased at 8 h, followed by a significant elevation of the reactive oxygen species (ROS) level at 24 h, and eventual cell death. In C. luteoviridis, the mitochondrial apoptosis pathway, revealed by the depolarization of the mitochondrial membrane potential at 1 h and increase in the ROS level and caspase-like activity at 8 h, might contribute to cell death. In addition, the dynamics of ROS levels and metacaspase activity were synchronized, suggesting that paraquat-triggered PCD was ROS-mediated in both M. aeruginosa and C. luteoviridis. These results provide insights into PCD patterns in prokaryotic cyanobacteria and eukaryotic green algae under similar stress.
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Affiliation(s)
- Fang Bai
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Yunlu Jia
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
| | - Jie Li
- School of Life Sciences, Central South University, Changsha 410013, China
| | - Zhongxing Wu
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region, School of Life Sciences, Southwest University, Chongqing 400715, China
| | - Lin Li
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Lirong Song
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
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de Carpentier F, Maes A, Marchand CH, Chung C, Durand C, Crozet P, Lemaire SD, Danon A. How abiotic stress-induced socialization leads to the formation of massive aggregates in Chlamydomonas. PLANT PHYSIOLOGY 2022; 190:1927-1940. [PMID: 35775951 PMCID: PMC9614484 DOI: 10.1093/plphys/kiac321] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Accepted: 06/16/2022] [Indexed: 05/05/2023]
Abstract
Multicellular organisms implement a set of reactions involving signaling and cooperation between different types of cells. Unicellular organisms, on the other hand, activate defense systems that involve collective behaviors between individual organisms. In the unicellular model alga Chlamydomonas (Chlamydomonas reinhardtii), the existence and the function of collective behaviors mechanisms in response to stress remain mostly at the level of the formation of small structures called palmelloids. Here, we report the characterization of a mechanism of abiotic stress response that Chlamydomonas can trigger to form massive multicellular structures. We showed that these aggregates constitute an effective bulwark within which the cells are efficiently protected from the toxic environment. We generated a family of mutants that aggregate spontaneously, the socializer (saz) mutants, of which saz1 is described here in detail. We took advantage of the saz mutants to implement a large-scale multiomics approach that allowed us to show that aggregation is not the result of passive agglutination, but rather genetic reprogramming and substantial modification of the secretome. The reverse genetic analysis we conducted allowed us to identify positive and negative regulators of aggregation and to make hypotheses on how this process is controlled in Chlamydomonas.
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Affiliation(s)
- Félix de Carpentier
- Institut de Biologie Physico-Chimique, UMR 8226, CNRS, Sorbonne Université, 75005 Paris, France
- Institut de Biologie Paris-Seine, UMR 7238, CNRS, Sorbonne Université, 75005 Paris, France
- Université Paris-Saclay, 91190 Saint-Aubin, France
| | - Alexandre Maes
- Institut de Biologie Physico-Chimique, UMR 8226, CNRS, Sorbonne Université, 75005 Paris, France
| | - Christophe H Marchand
- Institut de Biologie Physico-Chimique, UMR 8226, CNRS, Sorbonne Université, 75005 Paris, France
- Institut de Biologie Paris-Seine, UMR 7238, CNRS, Sorbonne Université, 75005 Paris, France
| | - Céline Chung
- Institut de Biologie Physico-Chimique, UMR 8226, CNRS, Sorbonne Université, 75005 Paris, France
| | - Cyrielle Durand
- Institut de Biologie Physico-Chimique, UMR 8226, CNRS, Sorbonne Université, 75005 Paris, France
| | - Pierre Crozet
- Institut de Biologie Physico-Chimique, UMR 8226, CNRS, Sorbonne Université, 75005 Paris, France
- Institut de Biologie Paris-Seine, UMR 7238, CNRS, Sorbonne Université, 75005 Paris, France
- Polytech-Sorbonne, Sorbonne Université, 75005 Paris, France
| | - Stéphane D Lemaire
- Institut de Biologie Physico-Chimique, UMR 8226, CNRS, Sorbonne Université, 75005 Paris, France
- Institut de Biologie Paris-Seine, UMR 7238, CNRS, Sorbonne Université, 75005 Paris, France
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Anido-Varela L, Seoane M, Esperanza M, Cid Á, Rioboo C. Cytotoxicity of BP-3 and BP-4: Blockage of extrusion pumps, oxidative damage and programmed cell death on Chlamydomonas reinhardtii. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2022; 251:106285. [PMID: 36087491 DOI: 10.1016/j.aquatox.2022.106285] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 08/29/2022] [Accepted: 08/30/2022] [Indexed: 06/15/2023]
Abstract
The health concern associated with the dangers related to exposure to UV radiation has led to an increase in the use of sunscreens containing UV-filters that can reach aquatic environments and possibly affect ecosystems. Benzophenone-3 (BP-3) and benzophenone-4 (BP-4) are two of the most used UV-filters. In the present work, the microalga Chlamydomonas reinhardtii was exposed to several concentrations of both chemicals. To evaluate their potential cytotoxicity on microalgal cells, different parameters were analysed including fast response biomarkers (increase in intracellular free Ca2+) as well as biomarkers related with the presence of oxidative stress (lipid peroxidation), energy metabolism (photosynthetic yield and cytoplasmic lipid accumulations), cell division (proliferation and F-actin content), programmed cell death (PCD) (caspase activation and DNA fragmentation) and possible mechanisms of resistance to xenobiotics (operation of extrusion pumps and presence of autophagic vacuoles). Results showed an increment of the percentage of cells with cytosolic free Ca2+ that could act as a secondary messenger in response to the stress. A decrease in photosynthetic yield and an increase in cytoplasmic lipid accumulations and lipid peroxidation levels were also detected. In addition, a decrease in cell proliferation was observed, linked to a decrease in the percentage of cells with F-actin. The increase observed in the microalgal population with caspase activity, together with the DNA fragmentation and the alterations in the cytoskeleton, suggested the induction of processes linked to PCD. Moreover, a blockage of extrusion pumps, which could be related to the toxicity mechanism of these compounds, and an increase in autophagic vacuoles, as an attempt to repair the damage caused by benzophenones, were detected. Overall, these biomarkers indicate that both UV-filters can be a serious threat to non-target photosynthetic microorganisms in aquatic environments, although BP-3 affected C. reinhardtii more markedly.
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Affiliation(s)
- Laura Anido-Varela
- Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, 15071 A Coruña, SPAIN
| | - Marta Seoane
- Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, 15071 A Coruña, SPAIN
| | - Marta Esperanza
- Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, 15071 A Coruña, SPAIN
| | - Ángeles Cid
- Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, 15071 A Coruña, SPAIN
| | - Carmen Rioboo
- Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, 15071 A Coruña, SPAIN.
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Shoman N, Solomonova E, Akimov A, Rylkova OA, Meger Y. Responses of Prorocentrum cordatum (Ostenfeld) Dodge, 1975 (Dinoflagellata) to copper nanoparticles and copper ions effect. PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS : AN INTERNATIONAL JOURNAL OF FUNCTIONAL PLANT BIOLOGY 2022; 28:1625-1637. [PMID: 36389098 PMCID: PMC9530086 DOI: 10.1007/s12298-022-01228-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 08/08/2022] [Accepted: 08/30/2022] [Indexed: 06/16/2023]
Abstract
In the present study, changes were determined in morphological, structural-functional, and fluorescent parameters of Prorocentrum cordatum with the addition of CuO nanoparticles (NPs) and copper ions (CuSO4). A stimulating effect of low Cu2+ concentrations (30 μg L-1) on algal growth characteristics was observed. Higher Cu2+ concentration of 60-600 μg L-1 and CuO NPs concentration of 100-520 μg L-1 inhibited algal growth. Ionic copper is more toxic to P. cordatum than NPs. After 72 h of algae cultivation in the medium supplemented with CuSO4 and CuO NPs, EC50 values (calculated based on cell abundance) were of 60 and 300 μg L-1 (in terms of copper ions), respectively. Reduction in algal growth rate is due to disruption in cell cycle, changes in nuclear morphology, chromatin dispersion, and DNA damage. The studied pollutants slightly affected the efficiency of P. cordatum photosynthetic apparatus. Addition of the pollutants resulted in an increased production of reactive oxygen species (ROS). At a concentration of Cu2+ of 120 μg L-1 and a concentration of CuO NPs 0-300 μg L-1 of CuO NPs increase in ROS production is short-term with a decrease at later stages of the experiment. This is probably due to the activation of antioxidant mechanisms in cells and an increase in the concentration of carotenoids (peridinin) in cells. The high values of ROS production persisted throughout the experiment at sublethal copper concentrations (400-600 μg L-1 of CuSO4 and 520 μg L-1 of CuO NPs). Sublethal concentrations of pollutants caused restructuring of cell membranes in P. cordatum. Shedding of cell membranes (ecdysis) and formation of immobile stages (temporary or resting cysts) were recorded. The pronounced mechanical impact of NPs on the cell surface was observed such as-deformation and damage of a cell wall, its "wrinkling" and shrinkage, and adsorption of NP aggregates.
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Affiliation(s)
- Natalia Shoman
- Algae Ecological Physiology Department, Moscow Representative Office of A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS, Moscow, Russian Federation
| | - Ekaterina Solomonova
- Algae Ecological Physiology Department, Moscow Representative Office of A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS, Moscow, Russian Federation
| | - Arkadii Akimov
- Algae Ecological Physiology Department, Moscow Representative Office of A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS, Moscow, Russian Federation
| | - Olga A. Rylkova
- Department of Biotechnology and Phytoresources, Moscow Representative Office of A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS, Moscow, Russian Federation
| | - Yakov Meger
- Sevastopol State University, Sevastopol, Russian Federation
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15
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Zhang YJ, Jiang L, Ahamd S, Chen Y, Zhang JY, Stanley D, Miao H, Ge LQ. The octopamine receptor, OA2B2, modulates stress resistance and reproduction in Nilaparvata lugens Stål (Hemiptera: Delphacidae). INSECT MOLECULAR BIOLOGY 2022; 31:33-48. [PMID: 34480382 DOI: 10.1111/imb.12736] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 08/19/2021] [Accepted: 08/31/2021] [Indexed: 06/13/2023]
Abstract
The brown planthopper (BPH), Nilaparvata lugens (Stål) is a resurgent pest of rice crops throughout Asia. We recently discovered that octopamine (OA) and OA2B2 operate in the BPH mating system, where it mediates a wide range of molecular, physiological and behavioural changes. Here, we report on outcomes of experiments designed to test the hypothesis that OA/OA2B2 signalling mediates responses to three abiotic stressors, starvation, high temperature (37 °C), and induced oxidative stress. We found per os RNAi-mediated OA2B2 silencing led to significantly decreased survival, measured in days, following exposure to each of these stressors. We selected a biologically costly process, reproductive biology, as a biotic stressor. Silencing of OA2B2 led to decreased total protein content in ovaries and fat bodies, downregulated expression of vitellogenin (Vg) and Vg receptor (VgR), inhibited fat body Vg protein synthesis, shortened the oviposition period, prolonged the preoviposition period, reduced the number of laid eggs, body weight and female longevity. In addition, the silencing treatments also led to inhibited ovarian development, and ovarian Vg uptake, reduced numbers of egg masses and offspring and lower hatching rates and population growth index. These data support our hypothesis that OA2B2 acts in mediating BPH resistance to biotic and abiotic stressors.
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Affiliation(s)
- Y J Zhang
- School of Horticulture and Plant Protection, Yangzhou University, Yangzhou, Jiangsu Province, China
- College of Mechanical Engineering, Yangzhou University, Yangzhou, Jiangsu Province, China
| | - L Jiang
- School of Horticulture and Plant Protection, Yangzhou University, Yangzhou, Jiangsu Province, China
| | - S Ahamd
- School of Horticulture and Plant Protection, Yangzhou University, Yangzhou, Jiangsu Province, China
| | - Y Chen
- School of Horticulture and Plant Protection, Yangzhou University, Yangzhou, Jiangsu Province, China
| | - J Y Zhang
- School of Horticulture and Plant Protection, Yangzhou University, Yangzhou, Jiangsu Province, China
| | - D Stanley
- USDA/Agricultural Research Service, Biological Control of Insects Research Laboratory, Columbia, MO, USA
| | - H Miao
- College of Mechanical Engineering, Yangzhou University, Yangzhou, Jiangsu Province, China
| | - L Q Ge
- School of Horticulture and Plant Protection, Yangzhou University, Yangzhou, Jiangsu Province, China
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16
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Almeida AC, Gomes T, Lomba JAB, Lillicrap A. Specific toxicity of azithromycin to the freshwater microalga Raphidocelis subcapitata. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 222:112553. [PMID: 34325198 DOI: 10.1016/j.ecoenv.2021.112553] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 07/12/2021] [Accepted: 07/21/2021] [Indexed: 06/13/2023]
Abstract
Pharmaceuticals are produced to inflict a specific physiological response in organisms. However, as only partially metabolized after administration, these types of compounds can also originate harmful side effects to non-target organisms. Additionally, there is still a lack of knowledge on the toxicological effects of legacy pharmaceuticals such as the antibiotic azithromycin. This macrolide occurs at high concentrations in the aquatic environment and can constitute a threat to aquatic organisms that are at the basis of the aquatic food chain, namely microalgae. This study established a high-throughput methodology to study the toxicity of azithromycin to the freshwater microalga Raphidocelis subcapitata. Flow cytometry and pulse amplitude modulated (PAM) fluorometry were used as screening tools. General toxicity was shown by effects in growth rate, cell size, cell complexity, cell viability and cell cycle. More specific outcomes were indicated by the analysis of mitochondrial and cytoplasmatic membrane potentials, DNA content, formation of ROS and LPO, natural pigments content and photosystem II performance. The specific mode of action (MoA) of azithromycin to crucial components of microalgae cells was revealed. Azithromycin had a negative impact on the regulation of energy dissipation at the PSII centers, along with an insufficient protection by the regulatory mechanisms leading to photodamage. The blockage of photosynthetic electrons led to ROS formation and consequent oxidative damage, affecting membranes and DNA. Overall, the used methodology exhibited its high potential for detecting the toxic MoA of compounds in microalgae and should be considered for future risk assessment of pharmaceuticals.
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Affiliation(s)
- Ana Catarina Almeida
- Norwegian Institute for Water Research (NIVA), Gaustadalléen 21, Oslo 0349, Norway.
| | - Tânia Gomes
- Norwegian Institute for Water Research (NIVA), Gaustadalléen 21, Oslo 0349, Norway
| | | | - Adam Lillicrap
- Norwegian Institute for Water Research (NIVA), Gaustadalléen 21, Oslo 0349, Norway
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17
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You X, Xu N, Yang X, Sun W. Pollutants affect algae-bacteria interactions: A critical review. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 276:116723. [PMID: 33611207 DOI: 10.1016/j.envpol.2021.116723] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2020] [Revised: 02/05/2021] [Accepted: 02/08/2021] [Indexed: 06/12/2023]
Abstract
With increasing concerns on the ecological risks of pollutants, many efforts have been devoted to revealing the toxic effects of pollutants on algae or bacteria in their monocultures. However, how pollutants affect algae and bacteria in their cocultures is still elusive but crucial due to its more environmental relevance. The present review outlines the interactions between algae and bacteria, reveals the influential mechanisms of pollutants (including pesticides, metals, engineered nanomaterials, pharmaceutical and personal care products, and aromatic pollutants) to algae and bacteria in their coexisted systems, and puts forward prospects for further advancing toxic studies in algal-bacterial systems. Pollutants affect the physiological and ecological functions of bacteria and algae by interfering with their relationships. Cell-to-cell adhesion, substrate exchange and biodegradation of organic pollutants, enhancement of signal transduction, and horizontal transfer of tolerance genes are important defense strategies in algal-bacterial systems to cope with pollution stress. Developing suitable algal-bacterial models, identifying cross-kingdom signaling molecules, and deciphering the horizontal transfer of pollutant resistant genes between algae and bacteria under pollution stress are the way forward to fully exploit the risks of pollutants in natural aquatic environments.
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Affiliation(s)
- Xiuqi You
- College of Environmental Sciences and Engineering, Peking University, State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, International Joint Laboratory for Regional Pollution Control, Ministry of Education, Beijing, 100871, China
| | - Nan Xu
- Shenzhen Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen, 518055, China
| | - Xi Yang
- State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining, 810016, China
| | - Weiling Sun
- College of Environmental Sciences and Engineering, Peking University, State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, International Joint Laboratory for Regional Pollution Control, Ministry of Education, Beijing, 100871, China.
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18
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Liu J, Yu Q, Ye B, Zhu K, Yin J, Zheng T, Xu S, Sun Q, Li Y, Zuo Z. Programmed cell death of Chlamydomonas reinhardtii induced by three cyanobacterial volatiles β-ionone, limonene and longifolene. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 762:144539. [PMID: 33360449 DOI: 10.1016/j.scitotenv.2020.144539] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 11/22/2020] [Accepted: 12/12/2020] [Indexed: 06/12/2023]
Abstract
β-Ionone, limonene and longifolene are 3 main components in cyanobacterial volatile organic compounds, which are formed through different pathways and can poison and even kill other algae. To uncover their toxic mechanism from programmed cell death (PCD), the photosynthetic pigments, chlorophyll fluorescence, caspase-like activities, cell size, nuclear variations and DNA ladders were investigated in Chlamydomonas reinhardtii treated with β-ionone (0.2 mM), limonene (0.2 mM) and longifolene (0.4 mM) at lethal concentration during 24 h. In the treatments with the 3 compounds, the photosynthetic pigments in C. reinhardtii cells gradually degraded, and Fv/Fm gradually decreased and disappeared at 24 h, suggesting that the cell death might be a PCD, due to the physiological activities gradually disappearing. During the cell death, the activities of caspase-9-like and caspase-3-like significantly increased, with the highest at 1 h. With prolonging the treatment time, C. reinhardtii cells gradually shrank, and the nuclei concentrated firstly following by a broken process, with moving to the cell edge. For DNA, obvious ladders were detected at 1 h, and then they gradually degraded to fragments of 100-250 bp at 24 h. These hallmarks suggested that β-ionone, limonene and longifolene may poison other algae by inducing PCD.
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Affiliation(s)
- Jialu Liu
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China
| | - Qianpeng Yu
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China
| | - Bingqi Ye
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China
| | - Kaiqi Zhu
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China
| | - Jiawen Yin
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China
| | - Tiefeng Zheng
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China
| | - Sun Xu
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China
| | - Qing Sun
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China
| | - Yan Li
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China
| | - Zhaojiang Zuo
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China.
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19
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Míguez L, Esperanza M, Seoane M, Cid Á. Assessment of cytotoxicity biomarkers on the microalga Chlamydomonas reinhardtii exposed to emerging and priority pollutants. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 208:111646. [PMID: 33396166 DOI: 10.1016/j.ecoenv.2020.111646] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 10/29/2020] [Accepted: 11/09/2020] [Indexed: 06/12/2023]
Abstract
Contamination of aquatic ecosystems linked to anthropogenic activity is currently a major concern; therefore, ecotoxicological studies are needed to assess its effect on organisms. The main objective of this study was to investigate the effects of different pollutants on microalgae in search of sensitive biomarkers that can promote a common cytotoxic response regardless of the contaminant. Cultures of the freshwater microalga Chlamydomonas reinhardtii were exposed for 24 h to four chemicals, three emerging pollutants (benzophenone-3, bisphenol A and oxytetracycline) and one priority substance (atrazine). A cytometric panel was carried out to assess toxicity biomarkers including cellular growth, inherent cell properties, viability, vitality, cytoplasmic membrane potential and ROS levels. Lipid peroxidation, photosynthetic efficiency and transcriptional responses of photosynthesis- and oxidative stress-related genes using RT-qPCR were also studied. Some toxicity responses showed a similar pattern; a decrease in growth rate, vitality and photosynthetic efficiency and an increase in autofluorescence and in the number of cells with depolarised cytoplasmic membrane and were found for all chemicals tested. However, ATZ and OTC provoked a decrease in cell size, whereas BP-3 and BPA caused an increase in cell size, intracellular complexity and ROS levels and a decrease in cell viability. Assayed pollutants generally promoted an overexpression of genes related to cellular antioxidant defence system and a subexpression of photosynthesis-related genes. In addition to the traditional growth endpoint, cell vitality, autofluorescence and gene expression of catalase, glutathione peroxidase and Fe-superoxide dismutase were significantly affected for all chemicals tested, showing a common cytotoxic response. Among the tested substances, BP-3 provoked the strongest cytotoxic alterations on this microalga, pointing out that some emerging contaminants could be more harmful to organisms than priority pollutants.
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Affiliation(s)
- Laura Míguez
- Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, 15071 A Coruña, Spain
| | - Marta Esperanza
- Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, 15071 A Coruña, Spain
| | - Marta Seoane
- Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, 15071 A Coruña, Spain
| | - Ángeles Cid
- Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, 15071 A Coruña, Spain.
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20
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Wang S, Liu M, Wang J, Huang J, Wang J. Polystyrene nanoplastics cause growth inhibition, morphological damage and physiological disturbance in the marine microalga Platymonas helgolandica. MARINE POLLUTION BULLETIN 2020; 158:111403. [PMID: 32753188 DOI: 10.1016/j.marpolbul.2020.111403] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 06/22/2020] [Accepted: 06/22/2020] [Indexed: 05/25/2023]
Abstract
Effects of nanoplastics at low level on the marine primary producer are largely unclear. To assess the potential risk of nanoplastic pollution, this study exposed marine green microalgae Platymonas helgolandica to 20, 200, and 2000 μg/L 70-nm polystyrene nanoplastics for 6 days. Nanoplastics significantly inhibited the growth of P. helgolandica during the first 4 days of exposure, and elevated heterocyst frequency was observed in 200 and 2000 μg/L exposure groups in the early exposure stage. Exposure to 200 and 2000 μg/L nanoplastics for 4 days increased the membrane permeability and mitochondrial membrane potential, and decreased light energy used in photochemical processes of microalgae. Moreover, clear morphological changes, including surface folds, fragmentation, aggregation cluster, and rupture, in the microalgae exposed to nanoplastics were observed under scanning electron microscope and transmission electron microscope. These results demonstrate that nanoplastics could reduce the microalgal vitality by the damage on cell morphology and organelle function.
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Affiliation(s)
- Shuyu Wang
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China
| | - Minhao Liu
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China
| | - Jinman Wang
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China
| | - Jingshan Huang
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China
| | - Jun Wang
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
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Gomes T, Almeida AC, Georgantzopoulou A. Characterization of cell responses in Rhodomonas baltica exposed to PMMA nanoplastics. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 726:138547. [PMID: 32320882 DOI: 10.1016/j.scitotenv.2020.138547] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 04/05/2020] [Accepted: 04/06/2020] [Indexed: 06/11/2023]
Abstract
Due to their small size, nanoplastics (NPLs) possess specific properties which can potentiate their toxicity towards aquatic organisms. As primary producers, microalgae are at the base of aquatic food chains, thus negative impacts of NPLs will likely lead to disturbances in ecosystem productivity. The majority of data available on the toxicity of NPLs is limited to polystyrene and green microalgae, leaving a significant lack of knowledge on impacts of other polymer types across different taxonomic groups. So, the main objective of this study was to evaluate the cell responses of the red microalgae Rhodomonas baltica to plain and carboxylated poly(methyl methacrylate) NPLs (PMMA and PMMA-COOH, 50 nm). Results showed different NPL behaviour in media over time, with PMMA forming micro-scale aggregates and PMMA-COOH maintaining its nominal size range. PMMA caused a higher impact in cellular and physiological parameters than PMMA-COOH, even though a decrease in algal growth was only seen for the later. Overall, PMMA caused a significant decrease in cell viability followed by an increase in cell size and complexity, overproduction of pigments, loss of membrane integrity, hyperpolarization of the mitochondrial membrane, increased production of ROS and LPO, decrease in DNA content and reduced photosynthetic capacity. Conversely, a decrease in algal growth for PMMA-COOH was connected to an impairment in cell cycle and consequent decrease in cell viability, metabolic activity and photosynthetic performance, with negligible effects in ROS formation and pigments content. This study provided a first insight into the mechanistic understanding of the toxic impacts of PMMA and PMMA-COOH NPLs in red microalgae. Results obtained suggest an interaction between both NPLs and R. baltica cell surface that is dependent on particle behaviour and surface chemistry. Future experiments focusing on the in-depth characterization of the mode of action of these particles are recommended.
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Affiliation(s)
- Tânia Gomes
- Norwegian Institute for Water Research (NIVA), Section of Ecotoxicology and Risk Assessment, Gaustadalléen 21, N-0349 Oslo, Norway.
| | - Ana Catarina Almeida
- Norwegian Institute for Water Research (NIVA), Section of Ecotoxicology and Risk Assessment, Gaustadalléen 21, N-0349 Oslo, Norway
| | - Anastasia Georgantzopoulou
- Norwegian Institute for Water Research (NIVA), Section of Ecotoxicology and Risk Assessment, Gaustadalléen 21, N-0349 Oslo, Norway
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22
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Almeida AC, Gomes T, Habuda-Stanić M, Lomba JAB, Romić Ž, Turkalj JV, Lillicrap A. Characterization of multiple biomarker responses using flow cytometry to improve environmental hazard assessment with the green microalgae Raphidocelis subcapitata. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 687:827-838. [PMID: 31412486 DOI: 10.1016/j.scitotenv.2019.06.124] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Revised: 06/06/2019] [Accepted: 06/07/2019] [Indexed: 06/10/2023]
Abstract
Microalgal toxicity tests using integrative endpoints as algal growth are regularly required to analyse the toxicity of potentially hazardous substances in the aquatic environment. However, these do not provide mechanistic information on the toxic mode of action by which contaminants may affect algae. Bottled waters can be used as a substitute for culturing media and should not impose any stress to the cultured organisms. However, certain chemical components can interfere with specific cell targets which are not revealed by general toxicity assays. The present study investigated the sensitivity of flow cytometry (FCM) to analyse sub-lethal effects of different bottled waters to the freshwater microalgae Raphidocelis subcapitata. Several endpoints were analysed including growth rate, natural pigments content, cell size, complexity, viability and cycle, Reactive Oxygen Species (ROS) formation, mitochondrial membrane potential and Lipid Peroxidation (LPO). Additionally, photosystem II (PSII) performance was analysed by PAM fluorometry, to provide further information on the absorption, distribution and use of energy in photosynthesis. Results indicated that the most sensitive endpoints were the oxidative stress related endpoints ROS formation and LPO, pigment content, morphological endpoints as cell size, complexity and cycle, with growth rate being one of the least sensitive. Although being essential macronutrients for algal growth, the chemical elements Ca, Na, Mg, and NH4 were identified as being primarily responsible for the observed toxicological effects to exposed algae. The applied methodology proved to be of high throughput, simultaneously assembling information on morphological, biochemical, and physiological status of algal cells. FCM also showed potential to reveal mechanistic information on the toxic mode of action of the bottled waters before any effects on algal growth was observed. The used approach demonstrated its potential for being integrated into future microalgal toxicity bioassays for testing chemicals to improve the hazard information obtained from currently approved internationally accepted test guidelines.
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Affiliation(s)
- Ana Catarina Almeida
- Norwegian Institute for Water Research (NIVA), Gaustadalléen 21, Oslo 0349, Norway.
| | - Tânia Gomes
- Norwegian Institute for Water Research (NIVA), Gaustadalléen 21, Oslo 0349, Norway
| | - Mirna Habuda-Stanić
- Josip Juraj Strossmayer University of Osijek, Faculty of Food Technology Osijek, Franje Kuhača 20, 31000 Osijek, Croatia
| | | | - Željka Romić
- Vodovod-Osijek d.o.o., Poljski put 1, 31000 Osijek, Croatia
| | | | - Adam Lillicrap
- Norwegian Institute for Water Research (NIVA), Gaustadalléen 21, Oslo 0349, Norway
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23
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Esperanza M, Seoane M, Rioboo C, Herrero C, Cid Á. Differential toxicity of the UV-filters BP-3 and BP-4 in Chlamydomonas reinhardtii: A flow cytometric approach. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 669:412-420. [PMID: 30884265 DOI: 10.1016/j.scitotenv.2019.03.116] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Revised: 03/06/2019] [Accepted: 03/08/2019] [Indexed: 06/09/2023]
Abstract
Due to the concern about the negative effects of exposure to sunlight, UV-filters are being introduced in all kind of cosmetic formulas. Wastewater treatment plants are not able to remove and/or degrade them; consequently they find their way into rivers, lakes and oceans. These chemicals are acquiring a concerning status due to their increasingly common use and the potential risk for the environment. Benzophenone-3 (BP-3) and Benzophenone-4 (BP-4) are broad-spectrum UV-filters used for the same purpose in personal care products, insecticides and plastic bags; however, after 96 h of exposure to several concentrations of these UV-filters, the growth of C. reinhardtii was more affected by BP-3 than by BP-4, being the 96 h-EC50 for growth 5 mg L-1 and 38 mg L-1, respectively. Based on these values Chlamydomonas reinhardtii cultures were exposed during 24 h to 2.5, 5 and 10 mg L-1 of BP-3 and 19, 38 and 76 mg L-1 of BP-4. A cytometric panel was carried out to evaluate the effect of sublethal concentrations of these UV-filters, thus several cytotoxicity biomarkers were analysed, including chlorophyll a fluorescence, viability, metabolic activity, oxidative stress, cytoplasmic and mitochondrial membrane potentials, and intracellular pH. BP-3 and BP-4 affect C.reinhardtii cells in a different way, showing differences for three of the examined parameters. Chlorophyll a fluorescence and mitochondrial membrane potential showed a significant increase (p < 0.05) in BP-3 and a significant decrease in BP-4, whereas viability only decreased significantly in the highest concentrations of BP-3. Regarding to the other parameters analysed, a similar pattern of cytotoxicity was observed. Growth rate, vital population and metabolic activity (esterase activity) and intracellular pH decreased significantly and cytoplasmic membrane potential and ROS levels increased significantly in cultures exposed to both pollutants.
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Affiliation(s)
- Marta Esperanza
- Laboratorio de Microbiología, Facultad de Ciencias, Universidad de A Coruña, Campus de A Zapateira s/n, 15071 A Coruña, Spain.
| | - Marta Seoane
- Laboratorio de Microbiología, Facultad de Ciencias, Universidad de A Coruña, Campus de A Zapateira s/n, 15071 A Coruña, Spain
| | - Carmen Rioboo
- Laboratorio de Microbiología, Facultad de Ciencias, Universidad de A Coruña, Campus de A Zapateira s/n, 15071 A Coruña, Spain
| | - Concepción Herrero
- Laboratorio de Microbiología, Facultad de Ciencias, Universidad de A Coruña, Campus de A Zapateira s/n, 15071 A Coruña, Spain
| | - Ángeles Cid
- Laboratorio de Microbiología, Facultad de Ciencias, Universidad de A Coruña, Campus de A Zapateira s/n, 15071 A Coruña, Spain
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24
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Dupraz V, Ménard D, Akcha F, Budzinski H, Stachowski-Haberkorn S. Toxicity of binary mixtures of pesticides to the marine microalgae Tisochrysis lutea and Skeletonema marinoi: Substance interactions and physiological impacts. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2019; 211:148-162. [PMID: 30981038 DOI: 10.1016/j.aquatox.2019.03.015] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Revised: 03/21/2019] [Accepted: 03/21/2019] [Indexed: 06/09/2023]
Abstract
This study screened binary mixtures of pesticides for potential synergistic interaction effects on growth of the marine microalgae Tisochrysis lutea and Skeletonema marinoi. It also examined the single and combined effects of three of the most toxic substances on microalgal physiology. Single substances were first tested on each microalgal species to determine their respective EC50 and concentration-response relationships. The toxicity of six and seven binary mixtures was then evaluated in microplate experiments on the growth of T. lutea and S. marinoi, respectively, using two mixture modelling approaches: isobolograms and the MIXTOX tool, based on Concentration Addition (CA) or Independent Action (IA) models. Significant cases of antagonism (for both species) and synergism (for S. marinoi) were observed for the mixtures of isoproturon and spiroxamine, and isoproturon and metazachlor, respectively. These two mixtures, together with that of isoproturon and diuron, for which additivity was observed, were further studied for their impacts on the physiology of each species. Exposures were thus made in culture flasks at three concentrations, or concentration combinations for mixtures, selected to cause 25%, 50% and 75% growth rate inhibition. The effects of the selected pesticides singly and in combination were evaluated at three perceived effect concentrations on esterase metabolic activity, relative lipid content, cytoplasmic membrane potential and reactive oxygen species (ROS) content by flow cytometry, and on photosynthetic quantum yield (ϕ'M) by PAM-fluorescence. Isoproturon and diuron singly and in mixtures induced 20-40% decreases in ϕ'M which was in turn responsible for a significant decrease in relative lipid content for both species. Spiroxamine and metazachlor were individually responsible for an increase in relative lipid content (up to nearly 300% for metazachlor on S. marinoi), as well as cell depolarization and increased ROS content. The mixture of isoproturon and metazachlor tested on S. marinoi caused a 28-34% decrease in ϕ'M that was significantly higher than levels induced by each of substances when tested alone. This strong decrease in ϕ'M could be due to a combined effect of these substances on the photosynthetic apparatus, which is likely the cause of the synergy found for this mixture.
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Affiliation(s)
- Valentin Dupraz
- Ifremer, Laboratoire d'Écotoxicologie, rue de l'île d'Yeu, BP 21105, F-44311, Nantes cedex 03, France; Université de Nantes, UFR Sciences et Techniques, 2, rue de la Houssinière, BP 92208, 44322, Nantes Cedex 03, France.
| | - Dominique Ménard
- Ifremer, Laboratoire d'Écotoxicologie, rue de l'île d'Yeu, BP 21105, F-44311, Nantes cedex 03, France
| | - Farida Akcha
- Ifremer, Laboratoire d'Écotoxicologie, rue de l'île d'Yeu, BP 21105, F-44311, Nantes cedex 03, France
| | - Hélène Budzinski
- Université de Bordeaux, UMR 5805, EPOC, Laboratoire de Physico Toxico Chimie de l'environnement, 351 Cours de la Libération, CS 10004, F-33405, Talence Cedex, France; CNRS, UMR 5805, EPOC, Laboratoire de Physico Toxico Chimie de l'environnement, 351 Cours de la Libération, CS 10004, F-33405, Talence Cedex, France
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25
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Bautista-Chamizo E, Sendra M, Cid Á, Seoane M, Romano de Orte M, Riba I. Will temperature and salinity changes exacerbate the effects of seawater acidification on the marine microalga Phaeodactylum tricornutum? THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 634:87-94. [PMID: 29626774 DOI: 10.1016/j.scitotenv.2018.03.314] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Revised: 03/25/2018] [Accepted: 03/25/2018] [Indexed: 06/08/2023]
Abstract
To evaluate the effects related to the combination of potential future changes in pH, temperature and salinity on microalgae, a laboratory experiment was performed using the marine diatom Phaeodactylum tricornutum. Populations of this species were exposed during 48h to a three-factor experimental design (3×2×2) with two artificial pH values (6, 7.4), two levels of temperature (23°C, 28°C), two levels of salinity (34psu, 40psu) and a control (pH8, Temp 23°C, Sal 34psu). The effects on growth, cell viability, metabolic activity, and inherent cell properties (size, complexity and autofluorescence) of P. tricornutum were studied using flow cytometry. The results showed adverse effects on cultures exposed to pH6 and high temperature and salinity, being the inherent cell properties the most sensitive response. Also, linked effects of these parameters resulted on cell viability and cell size decrease and an increase of cell autofluorescence. The conclusions obtained from this work are useful to address the potential effects of climate change (in terms of changes on pH, salinity and temperature) in microalgae.
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Affiliation(s)
- Esther Bautista-Chamizo
- Departamento de Química-Física, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, Spain.
| | - Marta Sendra
- Departamento de Ecología y Gestión Costera, Instituto de Ciencias Marinas de Andalucía (CSIC), Spain
| | - Ángeles Cid
- Departamento de Biología, Facultad de Ciencias, Universidade da Coruña, Spain
| | - Marta Seoane
- Departamento de Biología, Facultad de Ciencias, Universidade da Coruña, Spain
| | - Manoela Romano de Orte
- Departamento de Ciências do Mar, Campus Baixada Santista, Universidade Federal de São Paulo, Brazil; Department of Global Ecology, Carnegie Institution for Science, Stanford, USA
| | - Inmaculada Riba
- Departamento de Química-Física, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, Spain
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26
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Charry MP, Keesing V, Costello M, Tremblay LA. Assessment of the ecotoxicity of urban estuarine sediment using benthic and pelagic copepod bioassays. PeerJ 2018; 6:e4936. [PMID: 29868297 PMCID: PMC5984583 DOI: 10.7717/peerj.4936] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Accepted: 05/21/2018] [Indexed: 12/25/2022] Open
Abstract
Urban estuarine sediments are sinks to a range of contaminants of anthropogenic origin, and a key challenge is to characterize the risk of these compounds to receiving environments. In this study, the toxicity of urban estuarine sediments was tested using acute and chronic bioassays in the benthic harpacticoid Quinquelaophonte sp., and in the planktonic calanoid Gladioferens pectinatus, two New Zealand copepod species. The sediment samples from the estuary tributary sites significantly impacted reproduction in Quinquelaophonte sp. However, results from one of the estuary sites were not significantly different to those from the tributaries sites, suggesting that chemicals other than trace metals, polycyclic aromatic hydrocarbons and ammonia may be the causative stressors. Sediment elutriate samples had significant effects on reproductive endpoints in G. pectinatus, and on the induction of DNA damage in cells, as shown by the comet assay. The results indicate that sediment contamination at the Ahuriri Estuary has the potential to impact biological processes of benthic and pelagic organisms. The approach used provides a standardized methodology to assess the toxicity of estuarine sediments.
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Affiliation(s)
- Maria P Charry
- School of Biological Sciences, University of Auckland, Auckland, New Zealand.,Cawthron Institute, Nelson, New Zealand
| | | | - Mark Costello
- Institute of Marine Science, University of Auckland, Auckland, New Zealand
| | - Louis A Tremblay
- School of Biological Sciences, University of Auckland, Auckland, New Zealand.,Cawthron Institute, Nelson, New Zealand
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27
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Seoane M, Esperanza M, Cid Á. Cytotoxic effects of the proton pump inhibitor omeprazole on the non-target marine microalga Tetraselmis suecica. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2017; 191:62-72. [PMID: 28800409 DOI: 10.1016/j.aquatox.2017.08.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Revised: 06/19/2017] [Accepted: 08/01/2017] [Indexed: 05/14/2023]
Abstract
Omeprazole (OMP) is one of the most commonly used drugs for the treatment of gastro-intestinal disorders. Although it is daily consumed in high quantities and commonly detected in waters worldwide, relatively little is known about its ecotoxicity. The aim of this study was to evaluate the potential acute toxicity of increasing concentrations of OMP on the marine microalga Tetraselmis suecica analysing several cytotoxicity biomarkers by flow cytometry after 24h of exposure. Results showed that OMP caused a decrease in growth and autofluorescence, an increase in cellular volume and intracellular complexity, hyperpolarization of cytoplasmic and mitochondrial membranes and intracellular acidification. In addition, large amounts of reactive oxygen species (ROS) were generated which resulted in a decrease in the percentage of the viable population. However, the viable population showed an increase in their metabolic activity as an early response to overcome the stress. In conclusion, OMP may affect proton pumps in non-target organisms such as microalgae; it disturbed pH homeostasis and provoked an early accumulation of ROS that resulted in a rapid cell death in cells exposed to the highest concentration assayed.
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Affiliation(s)
- Marta Seoane
- Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, 15071, A Coruña, Spain
| | - Marta Esperanza
- Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, 15071, A Coruña, Spain
| | - Ángeles Cid
- Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, 15071, A Coruña, Spain.
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28
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Fucic A, Guszak V, Mantovani A. Transplacental exposure to environmental carcinogens: Association with childhood cancer risks and the role of modulating factors. Reprod Toxicol 2017. [PMID: 28624605 DOI: 10.1016/j.reprotox.2017.06.044] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Biological responses to carcinogens from environmental exposure during adulthood are modulated over years or decades. Conversely, during transplacental exposure, the effects on the human foetus change within weeks, intertwining with developmental mechanisms: even short periods of transplacental exposure may be imprinted in the organism for a lifetime. The pathways leading to childhood and juvenile cancers, such as leukaemias, neuroblastoma/brain tumours, hepatoblastoma, and Willm's tumour involve prenatally-induced genomic, epigenomic and/or non-genomic effects caused by xenobiotics. Pregnant women most often live in complex environmental settings that cause transplacental exposure of the foetus to xenobiotic mixtures. Mother-child biomonitoring should integrate the analysis of chemicals/radiation present in the living and workplace environment with relevant risk modulators related to life style. The interdisciplinary approach for transplacental cancer risk assessment in high-pressure areas should be based on an integrated model for mother-child exposure estimation via profiling the exposure level by water quality analysis, usage of emission grids, and land use maps.
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Affiliation(s)
- A Fucic
- Institute for Medical Research and Occupational Health, Zagreb, Croatia.
| | - V Guszak
- University Clinical Centre "Zagreb", Zagreb, Croatia
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29
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González-Pleiter M, Rioboo C, Reguera M, Abreu I, Leganés F, Cid Á, Fernández-Piñas F. Calcium mediates the cellular response of Chlamydomonas reinhardtii to the emerging aquatic pollutant Triclosan. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2017; 186:50-66. [PMID: 28249228 DOI: 10.1016/j.aquatox.2017.02.021] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Revised: 02/17/2017] [Accepted: 02/19/2017] [Indexed: 06/06/2023]
Abstract
The present study was aimed at investigating the role of intracellular free calcium, [Ca2+]c, in the early cellular response of the green alga Chlamydomonas reinhardtii to the emergent pollutant Triclosan (13.8μM; 24h of exposure). There is a growing concern about the persistence and toxicity of this antimicrobial in aquatic environments, where non-target organisms such as C. reinhardtii, a primary producer of ecological relevance, might be severely impacted. A mechanistic study was undertaken which combined flow cytometry protocols, physiological as well as gene expression analysis. As an early response, Triclosan strongly altered [Ca2+]c homeostasis which could be prevented by prechelation with the intracellular calcium chelator BAPTA-AM. Triclosan induced ROS overproduction which ultimately leads to oxidative stress with loss of membrane integrity, membrane depolarization, photosynthesis inhibition and mitochondrial membrane depolarization; within this context, Triclosan also induced an increase in caspase 3/7 activity and altered the expression of metacaspase genes which are indicative of apoptosis. All these adverse outcomes were dependent on [Ca2+]c. Interestingly, an interconnection between [Ca2+]c alterations and increased ROS formation by Triclosan was found. Taken altogether these results shed light on the mechanisms behind Triclosan toxicity in the green alga Chlamydomonas reinhardtii and demonstrate the role of [Ca2+]c in mediating the observed toxicity.
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Affiliation(s)
- Miguel González-Pleiter
- Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Carmen Rioboo
- Laboratorio de Microbiología, Facultad de Ciencias, Universidad da Coruña, Campus de A Zapateira s/n, 15008 A Coruña, Spain
| | - María Reguera
- Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Isidro Abreu
- Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Francisco Leganés
- Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Ángeles Cid
- Laboratorio de Microbiología, Facultad de Ciencias, Universidad da Coruña, Campus de A Zapateira s/n, 15008 A Coruña, Spain
| | - Francisca Fernández-Piñas
- Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
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30
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Sun J, Zhang R, Qin L, Zhu H, Huang Y, Xue Y, An S, Xie X, Li A. Genotoxicity and cytotoxicity reduction of the polluted urban river after ecological restoration: a field-scale study of Jialu River in northern China. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:6715-6723. [PMID: 28091988 DOI: 10.1007/s11356-016-8352-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Accepted: 12/28/2016] [Indexed: 06/06/2023]
Abstract
To further treat the reclaimed municipal wastewater and rehabilitate the aquatic ecosystem of polluted urban rivers, an 18.5-km field-scale ecological restoration project was constructed along Jialu River, a polluted urban river which receives only reclaimed municipal wastewater from Zhengzhou City without natural upland water dilution. This study investigated the potential efficiency of water quality improvement, as well as genotoxicity and cytotoxicity reduction along the ecological restoration project of this polluted urban river. Results showed that the chemical oxygen demand (COD) and ammonia nitrogen (NH3-N) of the reclaimed municipal effluent were reduced by more than 45 and 70%, respectively, meeting the Chinese surface water environmental quality standard level IV, while the total phosphorus and metal concentrations had no significant reduction along the restoration project, and Pb concentrations in all river water samples exceeded permissible limit in drinking water set by WHO (2006) and China (GB5749-2006). The in vitro SOS/umu assay showed 4-nitroquinoline-1-oxide equivalent (4-NQO-EQ) values of reclaimed municipal wastewater of 0.69 ± 0.05 μg/L in April and 0.68 ± 0.06 μg/L in December, respectively, indicating the presence of genotoxic compounds. The results of 8-hydroxy-2'-deoxyguanosine (8-OHdG) and hepatic cell apoptosis in zebrafish after a chorionic long-term (21 days) in vivo exposure also demonstrated that the reclaimed municipal wastewater caused significant DNA oxidative damage and cytotoxicity. After the ecological purification of 18.5-km field-scale restoration project, the genotoxicity assessed by in vitro assay was negligible, while the DNA oxidative damage and cytotoxicity in exposed fish were still significantly elevated. The mechanisms of DNA oxidative damage and cytotoxicity caused by the reclaimed municipal wastewater need further study.
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Affiliation(s)
- Jie Sun
- State Key Laboratory of Pollution Control and Resource Reuse, Center for Hydrosciences Research, School of the Environment, School of Life Science, Nanjing University, Nanjing, People's Republic of China
| | - Rui Zhang
- School of Resources and Environment, University of Jinan, Jinan, Shandong, 250022, China
| | - Long Qin
- State Key Laboratory of Pollution Control and Resource Reuse, Center for Hydrosciences Research, School of the Environment, School of Life Science, Nanjing University, Nanjing, People's Republic of China
| | - Haixiao Zhu
- State Key Laboratory of Pollution Control and Resource Reuse, Center for Hydrosciences Research, School of the Environment, School of Life Science, Nanjing University, Nanjing, People's Republic of China
| | - Yu Huang
- State Key Laboratory of Pollution Control and Resource Reuse, Center for Hydrosciences Research, School of the Environment, School of Life Science, Nanjing University, Nanjing, People's Republic of China
| | - Yingang Xue
- State Key Laboratory of Pollution Control and Resource Reuse, Center for Hydrosciences Research, School of the Environment, School of Life Science, Nanjing University, Nanjing, People's Republic of China
- Changzhou Environmental Monitoring Center, Changzhou, Jiangsu, People's Republic of China
| | - Shuqing An
- State Key Laboratory of Pollution Control and Resource Reuse, Center for Hydrosciences Research, School of the Environment, School of Life Science, Nanjing University, Nanjing, People's Republic of China
| | - Xianchuan Xie
- State Key Laboratory of Pollution Control and Resource Reuse, Center for Hydrosciences Research, School of the Environment, School of Life Science, Nanjing University, Nanjing, People's Republic of China.
| | - Aimin Li
- State Key Laboratory of Pollution Control and Resource Reuse, Center for Hydrosciences Research, School of the Environment, School of Life Science, Nanjing University, Nanjing, People's Republic of China
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Ockleford C, Adriaanse P, Berny P, Brock T, Duquesne S, Grilli S, Hernandez-Jerez AF, Bennekou SH, Klein M, Kuhl T, Laskowski R, Machera K, Pelkonen O, Pieper S, Smith R, Stemmer M, Sundh I, Teodorovic I, Tiktak A, Topping CJ, Wolterink G, Angeli K, Fritsche E, Hernandez-Jerez AF, Leist M, Mantovani A, Menendez P, Pelkonen O, Price A, Viviani B, Chiusolo A, Ruffo F, Terron A, Bennekou SH. Investigation into experimental toxicological properties of plant protection products having a potential link to Parkinson's disease and childhood leukaemia. EFSA J 2017; 15:e04691. [PMID: 32625422 PMCID: PMC7233269 DOI: 10.2903/j.efsa.2017.4691] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
In 2013, EFSA published a literature review on epidemiological studies linking exposure to pesticides and human health outcome. As a follow up, the EFSA Panel on Plant Protection Products and their residues (PPR Panel) was requested to investigate the plausible involvement of pesticide exposure as a risk factor for Parkinson's disease (PD) and childhood leukaemia (CHL). A systematic literature review on PD and CHL and mode of actions for pesticides was published by EFSA in 2016 and used as background documentation. The Panel used the Adverse Outcome Pathway (AOP) conceptual framework to define the biological plausibility in relation to epidemiological studies by means of identification of specific symptoms of the diseases as AO. The AOP combines multiple information and provides knowledge of biological pathways, highlights species differences and similarities, identifies research needs and supports regulatory decisions. In this context, the AOP approach could help in organising the available experimental knowledge to assess biological plausibility by describing the link between a molecular initiating event (MIE) and the AO through a series of biologically plausible and essential key events (KEs). As the AOP is chemically agnostic, tool chemical compounds were selected to empirically support the response and temporal concordance of the key event relationships (KERs). Three qualitative and one putative AOP were developed by the Panel using the results obtained. The Panel supports the use of the AOP framework to scientifically and transparently explore the biological plausibility of the association between pesticide exposure and human health outcomes, identify data gaps, define a tailored testing strategy and suggests an AOP's informed Integrated Approach for Testing and Assessment (IATA).
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Seoane M, Esperanza M, Rioboo C, Herrero C, Cid Á. Flow cytometric assay to assess short-term effects of personal care products on the marine microalga Tetraselmis suecica. CHEMOSPHERE 2017; 171:339-347. [PMID: 28030786 DOI: 10.1016/j.chemosphere.2016.12.097] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Revised: 11/29/2016] [Accepted: 12/20/2016] [Indexed: 06/06/2023]
Abstract
Large quantities of personal care products (PCPs) are used daily and many of their chemical ingredients are subsequently released into marine environments. Cultures of the marine microalga Tetraselmis suecica were exposed for 24 h to three emerging compounds included in the main classes of PCPs: the UV filter benzophenone-3 (BP-3), the disinfectant triclosan (TCS) and the fragrance tonalide (AHTN). Concentrations tested, expressed as cellular quota (pg cell-1), ranged from 5 to 40 for BP-3, from 2 to 16 for TCS and from 1.2 to 2.4 for AHTN. A small cytometric panel was carried out to evaluate key cytotoxicity biomarkers including inherent cell properties, growth and metabolic activity and cytoplasmic membrane properties. BP-3 caused a significant increase in growth rate, metabolic activity and chlorophyll a fluorescence from 10 pg cell-1. However, growth and esterase activity decreased in cells exposed to all TCS and AHTN concentrations, except the lowest ones. Also these two compounds provoked a significant swelling of cells, more pronounced in the case of TCS-exposed cells. Although all treated cells remained viable, changes in membrane potential were observed. BP-3 and AHTN caused a significant depolarization of cells from 10 to 1.6 pg cell-1, respectively; however all TCS concentrations assayed caused a noticeable hyperpolarization of cells. Metabolic activity and cytoplasmic membrane potential were the most sensitive parameters. It can be concluded that the toxicological model used and the toxicological parameters evaluated are suitable to assess the toxicity of these emerging contaminants.
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Affiliation(s)
- Marta Seoane
- Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, 15071 A Coruña, Spain
| | - Marta Esperanza
- Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, 15071 A Coruña, Spain
| | - Carmen Rioboo
- Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, 15071 A Coruña, Spain
| | - Concepción Herrero
- Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, 15071 A Coruña, Spain
| | - Ángeles Cid
- Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, 15071 A Coruña, Spain.
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Hernández AF, Menéndez P. Linking Pesticide Exposure with Pediatric Leukemia: Potential Underlying Mechanisms. Int J Mol Sci 2016; 17:461. [PMID: 27043530 PMCID: PMC4848917 DOI: 10.3390/ijms17040461] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Revised: 03/15/2016] [Accepted: 03/23/2016] [Indexed: 01/01/2023] Open
Abstract
Leukemia is the most common cancer in children, representing 30% of all childhood cancers. The disease arises from recurrent genetic insults that block differentiation of hematopoietic stem and/or progenitor cells (HSPCs) and drives uncontrolled proliferation and survival of the differentiation-blocked clone. Pediatric leukemia is phenotypically and genetically heterogeneous with an obscure etiology. The interaction between genetic factors and environmental agents represents a potential etiological driver. Although information is limited, the principal toxic mechanisms of potential leukemogenic agents (e.g., etoposide, benzene metabolites, bioflavonoids and some pesticides) include topoisomerase II inhibition and/or excessive generation of free radicals, which may induce DNA single- and double-strand breaks (DNA-DSBs) in early HSPCs. Chromosomal rearrangements (duplications, deletions and translocations) may occur if these lesions are not properly repaired. The initiating hit usually occurs in utero and commonly leads to the expression of oncogenic fusion proteins. Subsequent cooperating hits define the disease latency and occur after birth and may be of a genetic, epigenetic or immune nature (i.e., delayed infection-mediated immune deregulation). Here, we review the available experimental and epidemiological evidence linking pesticide exposure to infant and childhood leukemia and provide a mechanistic basis to support the association, focusing on early initiating molecular events.
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Affiliation(s)
- Antonio F Hernández
- Department of Legal Medicine and Toxicology, University of Granada School of Medicine, Granada 18016, Spain.
| | - Pablo Menéndez
- Department of Biomedicine, Josep Carreras Leukemia Research Institute, School of Medicine, University of Barcelona, Barcelona 08036, Spain.
- Instituciò Catalana de Recerca i Estudis Avançats (ICREA), Barcelona 08010, Spain.
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