1
|
Wang X, Ma T, Wei C, Liu J, Yu T, Zou Y, Liu S, Yang Z, Xi J. Toxic effects of exogenous retinoic acid on the neurodevelopment of zebrafish (Danio rerio) embryos. Neurotoxicol Teratol 2023; 100:107291. [PMID: 37689270 DOI: 10.1016/j.ntt.2023.107291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2023] [Revised: 08/30/2023] [Accepted: 08/30/2023] [Indexed: 09/11/2023]
Abstract
Endogenous retinoic acid (RA) is essential for embryonic development and maintaining adult physiological processes. Human-caused RA residues in the environment threaten the survival of organisms in the environment. We employed zebrafish as a model to explore the developmental impacts of excess RA. We used exogenous RA to raise the amount of RA signal in the embryos and looked at the effects of excess RA on embryonic morphological development. Upregulation of the RA signal significantly reduced embryo hatching and increased embryo malformation. To further understand the neurotoxic impact of RA signaling on early neurodevelopment, we measured the expression of neurodevelopmental marker genes and cell death and proliferation markers in zebrafish embryos. Exogenous RA disrupted stem cell (SC) and neuron marker gene expression and exacerbated apoptosis in the embryos. Furthermore, we looked into the links between the transcriptional coactivator RBM14 and RA signaling to better understand the mechanism of RA neurotoxicity. There was a negative interaction between RA signaling and the transcription coactivator RBM14, and the morpholino-induced RBM14 down-regulation can partially block the effects of RAR antagonist BMS493-induced RA signaling inhibition on embryonic malformation and cell apoptosis. In conclusion, exogenous RA causes neurodevelopmental toxicity, and RBM14 may be involved in this neurotoxic process.
Collapse
Affiliation(s)
- Xiaoxuan Wang
- Institute of Pharmaceutical Innovation, Hubei Province Key Laboratory of Occupational Hazard Identification and Control, School of Medicine, Wuhan University of Science and Technology, Wuhan, China
| | - Ting Ma
- Institute of Pharmaceutical Innovation, Hubei Province Key Laboratory of Occupational Hazard Identification and Control, School of Medicine, Wuhan University of Science and Technology, Wuhan, China
| | - Cizhao Wei
- Demonstration Center for Experimental Basic Medicine Education, Wuhan University Taikang Medical School (School of Basic Medical Sciences), Wuhan, Hubei, China
| | - Juan Liu
- Institute of Pharmaceutical Innovation, Hubei Province Key Laboratory of Occupational Hazard Identification and Control, School of Medicine, Wuhan University of Science and Technology, Wuhan, China
| | - Ting Yu
- Institute of Pharmaceutical Innovation, Hubei Province Key Laboratory of Occupational Hazard Identification and Control, School of Medicine, Wuhan University of Science and Technology, Wuhan, China
| | - Yu Zou
- Institute of Pharmaceutical Innovation, Hubei Province Key Laboratory of Occupational Hazard Identification and Control, School of Medicine, Wuhan University of Science and Technology, Wuhan, China
| | - Song Liu
- Institute of Pharmaceutical Innovation, Hubei Province Key Laboratory of Occupational Hazard Identification and Control, School of Medicine, Wuhan University of Science and Technology, Wuhan, China
| | - Zheqiong Yang
- Demonstration Center for Experimental Basic Medicine Education, Wuhan University Taikang Medical School (School of Basic Medical Sciences), Wuhan, Hubei, China.
| | - Jinlei Xi
- Institute of Pharmaceutical Innovation, Hubei Province Key Laboratory of Occupational Hazard Identification and Control, School of Medicine, Wuhan University of Science and Technology, Wuhan, China.
| |
Collapse
|
2
|
Toušová Z, Priebojová J, Javůrek J, Večerková J, Lepšová-Skácelová O, Sychrová E, Smutná M, Hilscherová K. Estrogenic and retinoid-like activity in stagnant waters with mass occurrence of water blooms. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 852:158257. [PMID: 36037903 DOI: 10.1016/j.scitotenv.2022.158257] [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: 05/08/2022] [Revised: 08/19/2022] [Accepted: 08/20/2022] [Indexed: 06/15/2023]
Abstract
Stagnant freshwaters can be affected by anthropogenic pollution and eutrophication that leads to massive growth of cyanobacteria and microalgae forming complex water blooms. These can produce various types of bioactive compounds, some of which may cause embryotoxicity, teratogenicity, endocrine disruption and impair animal or human health. This study focused on potential co-occurrence of estrogenic and retinoid-like activities in diverse stagnant freshwaters affected by phytoplankton blooms with varying taxonomic composition. Samples of phytoplankton bloom biomass and its surrounding water were collected from 17 independent stagnant water bodies in the Czech Republic and Hungary. Total estrogenic equivalents (EEQ) of the most potent samples reached up to 4.9 ng·g-1 dry mass (dm) of biomass extract and 2.99 ng·L-1 in surrounding water. Retinoic acid equivalent (REQ) measured by in vitro assay reached up to 3043 ng·g-1 dm in phytoplankton biomass and 1202 ng·L-1in surrounding water. Retinoid-like and estrogenic activities at some sites exceeded their PNEC and effect-based trigger values, respectively. The observed effects were not associated with any particular species of cyanobacteria or algae dominating the water blooms nor related to phytoplankton density. We found that taxonomically diverse phytoplankton communities can produce and release retinoid-like compounds to surrounding water, while estrogenic potency is likely related to estrogens of anthropogenic origin adsorbed to phytoplankton biomass. Retinoids occurring in water blooms are ubiquitous signalling molecules, which can affect development and neurogenesis. Selected water bloom samples (both water and biomass extracts) with retinoid-like activity caused effects on neurodifferentiation in vitro corresponding to those of equivalent all-trans-retinoic acid concentrations. Co-occurrence of estrogenic and retinoid-like activities in stagnant water bodies as well as the potential of compounds produced by water blooms to interfere with neural differentiation should be considered in the assessment of risks associated with water blooms, which can comprise complex mixtures of natural and anthropogenic bioactive compounds.
Collapse
Affiliation(s)
- Zuzana Toušová
- RECETOX, Faculty of Science, Masaryk University, Kotlarska 2, Brno, Czech Republic
| | - Jana Priebojová
- RECETOX, Faculty of Science, Masaryk University, Kotlarska 2, Brno, Czech Republic
| | - Jakub Javůrek
- RECETOX, Faculty of Science, Masaryk University, Kotlarska 2, Brno, Czech Republic
| | - Jaroslava Večerková
- RECETOX, Faculty of Science, Masaryk University, Kotlarska 2, Brno, Czech Republic
| | - Olga Lepšová-Skácelová
- Department of Botany, Faculty of Science, University of South Bohemia, Na Zlaté stoce 1, České Budějovice, Czech Republic
| | - Eliška Sychrová
- RECETOX, Faculty of Science, Masaryk University, Kotlarska 2, Brno, Czech Republic
| | - Marie Smutná
- RECETOX, Faculty of Science, Masaryk University, Kotlarska 2, Brno, Czech Republic
| | - Klára Hilscherová
- RECETOX, Faculty of Science, Masaryk University, Kotlarska 2, Brno, Czech Republic.
| |
Collapse
|
3
|
Pípal M, Novák J, Rafajová A, Smutná M, Hilscherová K. Teratogenicity of retinoids detected in surface waters in zebrafish embryos and its predictability by in vitro assays. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2022; 246:106151. [PMID: 35390581 DOI: 10.1016/j.aquatox.2022.106151] [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: 11/22/2021] [Revised: 03/08/2022] [Accepted: 03/25/2022] [Indexed: 06/14/2023]
Abstract
Retinoids are newly detected compounds in aquatic ecosystems associated with cyanobacterial water blooms. Their potential health risks are only scarcely described despite numerous detections of all-trans retinoic acid (ATRA) and its derivatives in the environment. Besides the known teratogen ATRA there is only little or no information about their potency and namely their effects in vivo. We characterize ATRA and 8 other retinoids reported to occur in the environment for their bioactivity and teratogenicity using four in vitro reporter gene assays and zebrafish (Danio rerio) embryotoxicity assay. Our results document the ability of these compounds to interfere with retinoid signalling and cause teratogenicity at environmentally relevant levels with EC50 values at nM (hundreds of ng/L) levels and teratogenic indexes ranging from 2.8 (9cis retinoic acid) to 15.8 (retinal). The relative potency of individual compounds for teratogenicity ranged from 0.059 (retinal) to 0.96 (5,6-epoxy ATRA) when compared to ATRA. An environmentally relevant mixture of retinoids was tested showing good predictability of teratogenicity from the in vitro activities and additive toxicity of the mixture. The high teratogenicity of the newly described compounds associated with cyanobacteria presents a concern for developmental stages due to high conservation of the retinoid signalling across vertebrates.
Collapse
Affiliation(s)
- Marek Pípal
- RECETOX, Faculty of Science, Masaryk University, Kotlarska 2, Kamenice, Brno 62500 , Czech Republic
| | - Jiří Novák
- RECETOX, Faculty of Science, Masaryk University, Kotlarska 2, Kamenice, Brno 62500 , Czech Republic
| | - Aneta Rafajová
- RECETOX, Faculty of Science, Masaryk University, Kotlarska 2, Kamenice, Brno 62500 , Czech Republic
| | - Marie Smutná
- RECETOX, Faculty of Science, Masaryk University, Kotlarska 2, Kamenice, Brno 62500 , Czech Republic
| | - Klára Hilscherová
- RECETOX, Faculty of Science, Masaryk University, Kotlarska 2, Kamenice, Brno 62500 , Czech Republic.
| |
Collapse
|
4
|
Smutna M, Vecerkova J, Priebojova J, Pipal M, Krauss M, Hilscherova K. Variability in retinoid-like activity of extracellular compound mixtures produced by wide spectra of phytoplankton species and contributing metabolites. JOURNAL OF HAZARDOUS MATERIALS 2021; 414:125412. [PMID: 34030396 DOI: 10.1016/j.jhazmat.2021.125412] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 01/22/2021] [Accepted: 02/10/2021] [Indexed: 06/12/2023]
Abstract
Some phytoplankton species were shown to produce teratogenic retinoids. This study assessed the variability in the extracellular production of compounds with retinoid-like activity for 50 independent cultivations of wide spectra of species including 12 cyanobacteria (15 strains) and 4 algae of different orders. Extracellular retinoid-like activity was detected for repeated cultivations of six cyanobacteria. The results were consistent for some species including Microcystis aeruginosa and Aphanizomenon gracile. The detected retinoid-like activities ranged from below the limit of quantification of 16 ng/L to over 6 µg all-trans retinoic acid (ATRA) equivalent/L. Nontargeted virtual fractionation together with suspect screening approach enabled to identify some retinoid-like compounds in exudates, including ATRA, 9/13-cis retinoic acid, all-trans 5,6-epoxy retinoic acid, 4keto-ATRA, 4keto-retinal, 4hydroxy-ATRA, and retinal. Most of them were for the first time repeatedly detected in exudates of all studied algae (at ng/L levels) and cyanobacteria. Their relative potencies ranged from 0.018 (retinal) to 1 compared to ATRA. They accounted for less than 0.1-50% of total detected retinoid-like activity. The high detected activities and concentrations of retinoids in some samples and their direct accessibility from exudates document potential risk of developmental toxicity for organisms in proximity of massive water blooms.
Collapse
Affiliation(s)
- Marie Smutna
- RECETOX, Masaryk University, Faculty of Science, Brno, Czech Republic
| | | | - Jana Priebojova
- RECETOX, Masaryk University, Faculty of Science, Brno, Czech Republic
| | - Marek Pipal
- RECETOX, Masaryk University, Faculty of Science, Brno, Czech Republic
| | - Martin Krauss
- UFZ Helmholtz Centre for Environmental Research, Permoserstraße 15, 04318 Leipzig, Germany
| | - Klara Hilscherova
- RECETOX, Masaryk University, Faculty of Science, Brno, Czech Republic.
| |
Collapse
|
5
|
Pípal M, Legradi J, Smutná M, Kočí T, Priebojová J, Bláhová L, Krauss M, Hilscherová K. Neurobehavioral effects of cyanobacterial biomass field extracts on zebrafish embryos and potential role of retinoids. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2020; 228:105613. [PMID: 32949975 DOI: 10.1016/j.aquatox.2020.105613] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Revised: 07/27/2020] [Accepted: 08/24/2020] [Indexed: 06/11/2023]
Abstract
Cyanobacteria are known for their ability to produce and release mixtures of up to thousands of compounds into the environment. Recently, the production of novel metabolites, retinoids, was reported for some cyanobacterial species along with teratogenic effects of samples containing these compounds. Retinoids are natural endogenous substances derived from vitamin A that play a crucial role in early vertebrate development. Disruption of retinoid signalling- especially during the early development of the nervous system- might lead to major malfunctions and malformations. In this study, the toxicity of cyanobacterial biomass samples from the field containing retinoids was characterized by in vivo and in vitro bioassays with a focus on the potential hazards towards nervous system development and function. Additionally, in order to identify the compounds responsible for the observed in vitro and in vivo effects the complex cyanobacterial extracts were fractionated (C18 column, water-methanol gradient) and the twelve obtained fractions were tested in bioassays. In all bioassays, all-trans retinoic acid (ATRA) was tested along with the environmental samples as a positive control. Retinoid-like activity (mediated via the retinoic acid receptor, RAR) was measured in the transgenic cell line p19/A15. The in vitro assay showed retinoid-like activity by specific interaction with RAR for the biomass samples. Neurotoxic effects of selected samples were studied on zebrafish (Danio rerio) embryos using the light/dark transition test (Viewpoint, ZebraLab system) with 120 hpf larvae. In the behavioural assay, the cyanobacterial extracts caused significant hyperactivity in zebrafish at 120 hpf after acute exposure (3 h prior to the measurement) at concentrations below the teratogenicity LOEC (0.2 g dw L-1). Similar effect was observed after exposure to fractions of the extracts with detected retinoid-like activity and additive effect was observed after combining the fractions. However, the effect on behaviour was not observed after exposure to ATRA only. To provide additional insight into the behavioural effects and describe the underlying mechanism gene expression of selected biomarkers was measured. We evaluated an array of 28 genes related to general toxicity, neurodevelopment, retinoid and thyroid signalling. We detected several affected genes, most notably, the Cyp26 enzymes that control endogenous ATRA concentration, which documents an effect on retinoid signalling.
Collapse
Affiliation(s)
- Marek Pípal
- RECETOX, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Jessica Legradi
- Institute for Environmental Science, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands
| | - Marie Smutná
- RECETOX, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Tereza Kočí
- RECETOX, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Jana Priebojová
- RECETOX, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Lucie Bláhová
- RECETOX, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Martin Krauss
- UFZ-Helmholtz Centre for Environmental Research, Department Effect-Directed Analysis, Permoserstrasse 15, 04318 Leipzig, Germany
| | - Klára Hilscherová
- RECETOX, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic.
| |
Collapse
|
6
|
Yeung KWY, Zhou GJ, Hilscherová K, Giesy JP, Leung KMY. Current understanding of potential ecological risks of retinoic acids and their metabolites in aquatic environments. ENVIRONMENT INTERNATIONAL 2020; 136:105464. [PMID: 31926435 DOI: 10.1016/j.envint.2020.105464] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 12/13/2019] [Accepted: 01/02/2020] [Indexed: 06/10/2023]
Abstract
In animals, retinoic acids (RAs), one of the main derivatives of vitamin A, are crucial for a variety of physiological processes. RAs, including all-trans-RA, 9-cis-RA, 13-cis-RA, and their corresponding metabolites (i.e., all-trans-4-oxo-RA, 9-cis-4-oxo-RA and 13-cis-4-oxo-RA) can be excreted through urination from humans and animals. Sewage treatment plants (STPs) are a significant source of RAs and 4-oxo-RAs into aquatic environments. RAs and 4-oxo-RAs can be identified and quantified by use of liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS). RAs and 4-oxo-RAs have been reported in various environmental matrices including rivers, lakes, reservoirs and coastal marine environments as well as in sewage effluents discharged from STPs. Greater concentrations of RAs and 4-oxo-RAs have been observed during blooms of cyanobacteria and microalgae, suggesting that cyanobacteria and microalgae are natural sources of RAs and 4-oxo-RAs in aquatic environments. These potential sources of RAs and 4-oxo-RAs raise concerns about their concentrations and risks in aquatic environments because excessive intake of these chemicals can result in abnormal morphological development in animals. Teratogenic effects were observed in amphibians, fish embryos, gastropods, mammals and birds when exposed to RAs. This review summarizes sources, concentrations, adverse effects and ecological risks of RAs and 4-oxo-RAs in aquatic environments. An interim, predicted no-effect concentration (PNEC) of RAs (in terms of at-RA) for freshwater environments was determined to be 3.93 ng/L at-RA equivalents. Based on limited data on concentrations of RAs in freshwater ecosystems, their hazard quotients were found to range from zero to 16.41, depending on the environmental conditions of receiving waters. Ecological risks of RAs in marine environments are yet to be explored due to the paucity of data related to both their concentrations in marine environment and toxic potencies to marine species. This review updates current knowledge of RAs and 4-oxo-RAs in aquatic environments and calls for more studies on their concentrations and fate in aquatic environments, especially estuarine and coastal marine environments with a view to enabling a comprehensive assessment of their ecological risks around the globe.
Collapse
Affiliation(s)
- Katie Wan Yee Yeung
- The Swire Institute of Marine Science and School of Biological Sciences, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Guang-Jie Zhou
- The Swire Institute of Marine Science and School of Biological Sciences, The University of Hong Kong, Pokfulam, Hong Kong, China.
| | - Klára Hilscherová
- RECETOX, Faculty of Science, Masaryk University, Kamenice 753/5, Pavilion A29, 625 00 Brno, Czech Republic
| | - John P Giesy
- Department of Veterinary Biomedical Sciences and Toxicology Centre, University of Saskatchewan, Saskatoon, SK, Canada; Department of Environmental Science, Baylor University, Waco, TX, United States
| | - Kenneth Mei Yee Leung
- The Swire Institute of Marine Science and School of Biological Sciences, The University of Hong Kong, Pokfulam, Hong Kong, China; State Key Laboratory of Marine Pollution (City University of Hong Kong), Tat Chee Avenue, Kowloon, Hong Kong, China.
| |
Collapse
|
7
|
Pipal M, Priebojova J, Koci T, Blahova L, Smutna M, Hilscherova K. Field cyanobacterial blooms producing retinoid compounds cause teratogenicity in zebrafish embryos. CHEMOSPHERE 2020; 241:125061. [PMID: 31877619 DOI: 10.1016/j.chemosphere.2019.125061] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 10/03/2019] [Accepted: 10/04/2019] [Indexed: 06/10/2023]
Abstract
Cyanobacteria routinely release potentially harmful bioactive compounds into the aquatic environment. Several recent studies suggested a potential link between the teratogenicity of effects caused by cyanobacteria and production of retinoids. To investigate this relationship, we analysed the teratogenicity of field-collected cyanobacterial bloom samples by means of an in vivo zebrafish embryo test, an in vitro reporter gene bioassay and by the chemical analysis of retinoids. Extracts of biomass from cyanobacterial blooms with the dominance of Microcystis aeruginosa and Aphanizomenon klebahnii were collected from water bodies in the Czech Republic and showed significant retinoid-like activity in vitro, as well as high degrees of teratogenicity in vivo. Chemical analysis was then used to identify a set of retinoids in ng per gram of dry weight concentration range. Subsequent fractionation and bioassay-based characterization identified two fractions with significant in vitro retinoid-like activity. Moreover, in most of the retinoids eluted from these fractions, teratogenicity with malformations typical for retinoid signalling disruption was observed in zebrafish embryos after exposure to the total extracts and these in vitro effective fractions. The zebrafish embryo test proved to be a sensitive toxicity indicator of the biomass extracts, as the teratogenic effects occurred at even lower concentrations than those expected from the activity detected in vitro. In fact, teratogenicity with retinoid-like activity was detected at concentrations that are commonly found in biomasses and even in bulk water surrounding cyanobacterial blooms. Overall, these results provide evidence of a link between retinoid-like activity, teratogenicity and the retinoids produced by cyanobacterial water blooms in the surrounding environment.
Collapse
Affiliation(s)
- Marek Pipal
- RECETOX Faculty of Science Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
| | - Jana Priebojova
- RECETOX Faculty of Science Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
| | - Tereza Koci
- RECETOX Faculty of Science Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
| | - Lucie Blahova
- RECETOX Faculty of Science Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
| | - Marie Smutna
- RECETOX Faculty of Science Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
| | - Klara Hilscherova
- RECETOX Faculty of Science Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic.
| |
Collapse
|
8
|
Roegner A, Truong L, Weirich C, Pírez-Schirmer M, Brena B, Miller TR, Tanguay R. Combined Danio rerio embryo morbidity, mortality and photomotor response assay: A tool for developmental risk assessment from chronic cyanoHAB exposure. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 697:134210. [PMID: 32380631 PMCID: PMC7111134 DOI: 10.1016/j.scitotenv.2019.134210] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Revised: 08/19/2019] [Accepted: 08/29/2019] [Indexed: 05/28/2023]
Abstract
Freshwater harmful algal blooms produce a broad array of bioactive compounds, with variable polarity. Acute exposure to cyanotoxins can impact the liver, nervous system, gastrointestinal tract, skin, and immune function. Increasing evidence suggests chronic effects from low-level exposures of cyanotoxins and other associated bioactive metabolites of cyanobacterial origin. These sundry compounds persist in drinking and recreational waters and challenge resource managers in detection and removal. A systematic approach to assess the developmental toxicity of cyanobacterial metabolite standards was employed utilizing a robust and high throughput developmental Danio rerio embryo platform that incorporated a neurobehavioral endpoint, photomotor response. Subsequently, we applied the platform to cyanobacterial bloom surface water samples taken from temperate recreational beaches and tropical lake subsistence drinking water sources as a model approach. Dechorionated Danio rerio embryos were statically immersed beginning at four to six hours post fertilization at environmentally relevant concentrations, and then assessed at 24 h and 5 days for morbidity, morphological changes, and photomotor response. At least one assessed endpoint deviated significantly for exposed embryos for 22 out of 25 metabolites examined. Notably, the alkaloid lyngbyatoxin-a resulted in profound, dose-dependent morbidity and mortality beginning at 5 μg/L. In addition, hydrophobic components of extracts from beach monitoring resulted in potent morbidity and mortality despite only trace cyanotoxins detected. The hydrophilic extracts with several order of magnitude higher concentrations of microcystins resulted in no morbidity or mortality. Developmental photomotor response was consistently altered in environmental bloom samples, independent of the presence or concentration of toxins detected in extracts. While limited with respect to more polar compounds, this novel screening approach complements specific fingerprinting of acutely toxic metabolites with robust assessment of developmental toxicity, critical for chronic exposure scenarios.
Collapse
Affiliation(s)
- Amber Roegner
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR, 97331, USA.
| | - Lisa Truong
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR, 97331, USA; Sinnhuber Aquatic Research Laboratory, Oregon State University, 28645 East Highway 34, Corvallis, OR 97333, USA
| | - Chelsea Weirich
- Joseph J. Zilber School of Public Health, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, USA
| | - Macarena Pírez-Schirmer
- Departamento de Biociencias, Cátedra de Inmunología, Facultad de Química, Universidad de la República, Instituto de Higiene, A. Navarro 3051, 11600 Montevideo, Uruguay
| | - Beatriz Brena
- Departamento de Biociencias, Cátedra de Inmunología, Facultad de Química, Universidad de la República, Instituto de Higiene, A. Navarro 3051, 11600 Montevideo, Uruguay; Departamento de Biociencias, Cátedra de Bioquímica, Facultad de Química, Universidad de la República, Gral. Flores 2124, 11800 Montevideo, Uruguay
| | - Todd R Miller
- Joseph J. Zilber School of Public Health, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, USA
| | - Robert Tanguay
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR, 97331, USA; Sinnhuber Aquatic Research Laboratory, Oregon State University, 28645 East Highway 34, Corvallis, OR 97333, USA
| |
Collapse
|
9
|
Miles JA, Machattou P, Nevin-Jones D, Webb ME, Millard A, Scanlan DJ, Taylor PC. Identification of a cyanobacterial aldehyde dehydrogenase that produces retinoic acid in vitro. Biochem Biophys Res Commun 2019; 510:27-34. [DOI: 10.1016/j.bbrc.2018.12.171] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Accepted: 12/27/2018] [Indexed: 11/15/2022]
|
10
|
Priebojová J, Hilscherová K, Procházková T, Sychrová E, Smutná M. Intracellular and extracellular retinoid-like activity of widespread cyanobacterial species. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2018; 150:312-319. [PMID: 29291583 DOI: 10.1016/j.ecoenv.2017.12.048] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Revised: 12/19/2017] [Accepted: 12/20/2017] [Indexed: 06/07/2023]
Abstract
Cyanobacterial species produce wide range of bioactive compounds. This study characterized production of retinoid-like compounds with embryotoxic and teratogenic potential by commonly occurring cyanobacterial species with tendency to form massive water blooms. The major goal was to simultaneously assess the intracellular and extracellular retinoid-like activity from several independent cultivations of one coccal (Microcystis aeruginosa) and four filamentous cyanobacteria (Aphanizomenon gracile, Cylindrospermopsis raciborskii, Limnothrix redekeii, and Planktothrix agardhii) and characterize the variability in its production among cultivations. The retinoid-like activity was evaluated by in vitro assay along with chemical analyses of nine retinoids: all-trans retinoic acid (ATRA), 9-cis retinoic acid (9cis-RA), 13cis-RA, 13cis-RA methyl ester, 5,6 epoxy-RA, 4keto-ATRA, 4keto-retinal, 4hydoxy-retinoic acid (4OH-ATRA), retinal and retinol. The production of retinoid-like compounds was recalculated per volume, per biomass dry weight and per cell to provide relevant data for risk assessment in relation to occurrence of massive water blooms in the environment. Total produced retinoid-like activity of five selected species ranged from 170 to 25,600ng ATRA-equivalents (REQ)/g dm corresponding to 0.001-0.392ng REQ/106 cyanobacterial cells. Results from chemical analyses showed that all tested extracts contained 4keto-ATRA and retinal. All-trans retinoic acid, 9/13cis-retinoic acid and 5,6 epoxy-retinoic acid were detected in most exudate and extract samples. The reported results of recalculated total retinoid-like activity enable potential predictions of its production by the studied species in water blooms of known cell densities relevant for risk assessment.
Collapse
Affiliation(s)
- Jana Priebojová
- RECETOX - Research Centre for Toxic Compounds in the Environment, Masaryk University, Faculty of Science, Brno Czech Republic
| | - Klára Hilscherová
- RECETOX - Research Centre for Toxic Compounds in the Environment, Masaryk University, Faculty of Science, Brno Czech Republic
| | - Tereza Procházková
- RECETOX - Research Centre for Toxic Compounds in the Environment, Masaryk University, Faculty of Science, Brno Czech Republic
| | - Eliška Sychrová
- RECETOX - Research Centre for Toxic Compounds in the Environment, Masaryk University, Faculty of Science, Brno Czech Republic
| | - Marie Smutná
- RECETOX - Research Centre for Toxic Compounds in the Environment, Masaryk University, Faculty of Science, Brno Czech Republic.
| |
Collapse
|