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Perina FC, Abessa DMDS, Pinho GLL, Castro ÍB, Fillmann G. Toxicity of antifouling biocides on planktonic and benthic neotropical species. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:61888-61903. [PMID: 36934191 DOI: 10.1007/s11356-023-26368-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Accepted: 03/06/2023] [Indexed: 05/10/2023]
Abstract
Organotin-based (OTs: TBT and TPT) antifouling paints have been banned worldwide, but recent inputs have been detected in tropical coastal areas. However, there is a lack of studies evaluating the toxicity of both legacy and their substitute antifouling booster biocides (e.g., Irgarol and diuron) on neotropical species. Therefore, the acute toxicity of four antifouling biocides (TBT, TPT, Irgarol, and diuron) was investigated using the marine planktonic organisms Acartia tonsa and Mysidopsis juniae, the estuarine tanaid Monokalliapseudes schubarti (water exposure), and the burrowing amphipod Tiburonella viscana (spiked sediment exposure). Results confirmed the high toxicity of the OTs, especially to planktonic species, being about two orders of magnitude higher than Irgarol and diuron. Toxic effects of antifouling compounds were observed at levels currently found in tropical coastal zones, representing a threat to planktonic and benthic invertebrates. Furthermore, deterministic PNECmarine sediment values suggest that environmental hazards in tropical regions may be higher due to the higher sensitivity of tropical organisms. Since regulations on antifouling biocides are still restricted to a few countries, more ecotoxicological studies are needed to derivate environmental quality standards based on realistic scenarios. The present study brings essential contributions regarding the ecological risks of these substances in tropical and subtropical zones.
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Affiliation(s)
- Fernando Cesar Perina
- Programa de Pós-Graduação em Oceanologia, Instituto de Oceanografia - IO. Universidade Federal Do Rio Grande - FURG, Rio Grande, RS, 96203-900, Brazil.
- CESAM-Centre for Environmental and Marine Studies and Department of Biology, University of Aveiro, Aveiro, 3810-193, Portugal.
| | - Denis Moledo de Souza Abessa
- Instituto de Biociências. Campus do Litoral Paulista, Universidade Estadual Paulista - UNESP, São Vicente, SP, 11330-900, Brazil
| | - Grasiela Lopes Leães Pinho
- Programa de Pós-Graduação em Oceanologia, Instituto de Oceanografia - IO. Universidade Federal Do Rio Grande - FURG, Rio Grande, RS, 96203-900, Brazil
- Instituto de Oceanografia, Universidade Federal do Rio Grande (IO-FURG), Av. Itália S/N, Campus Carreiros, Rio Grande, RS, 96203-900, Brazil
| | - Ítalo Braga Castro
- Programa de Pós-Graduação em Oceanologia, Instituto de Oceanografia - IO. Universidade Federal Do Rio Grande - FURG, Rio Grande, RS, 96203-900, Brazil
- Instituto do Mar, Universidade Federal de São Paulo - UNIFESP, Santos, SP, 11070-100, Brazil
| | - Gilberto Fillmann
- Programa de Pós-Graduação em Oceanologia, Instituto de Oceanografia - IO. Universidade Federal Do Rio Grande - FURG, Rio Grande, RS, 96203-900, Brazil.
- Instituto de Oceanografia, Universidade Federal do Rio Grande (IO-FURG), Av. Itália S/N, Campus Carreiros, Rio Grande, RS, 96203-900, Brazil.
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Mikac N, Furdek Turk M, Petrović D, Bigović M, Krivokapić S. First assessment of butyltins (BuTs) contamination of the Montenegrin coast (Southeast Adriatic): Tributyltin (TBT) poses a threat to the marine ecosystem. MARINE POLLUTION BULLETIN 2022; 185:114270. [PMID: 36347191 DOI: 10.1016/j.marpolbul.2022.114270] [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: 08/19/2022] [Revised: 10/13/2022] [Accepted: 10/16/2022] [Indexed: 06/16/2023]
Abstract
This study presents the first assessment of butyltins (BuTs) pollution of the Montenegrin coast. The distribution of tributyltin (TBT), dibutyltin (DBT) and monobutyltin (MBT) was investigated in mussels, sediments and water overlying sediment after the sediment resuspension. The results showed that the investigated sites (marinas, ports, shipyards) are contaminated with BuTs (19-402 ng (Sn)/g in mussels; 43-20,641 ng (Sn)/g in sediments; 9-566 ng (Sn)/L in overlying waters). The measured TBT concentrations indicate that toxic effects on marine organisms are expected at most locations. The simultaneous analysis of BuTs and total Sn in sediment cores allowed the assessment of TBT historical input, while it was demonstrated that resuspension of contaminated sediments leads to the release of all BuTs into the water column. This study shows that, despite the ban of TBT-based antifouling paints more than a decade ago, pollution of the marine environment with TBT is still a problem and regular monitoring remains essential.
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Affiliation(s)
- Nevenka Mikac
- Division for Marine and Environmental Research, Ruđer Bošković Institute, 10000 Zagreb, Croatia
| | - Martina Furdek Turk
- Division for Marine and Environmental Research, Ruđer Bošković Institute, 10000 Zagreb, Croatia.
| | - Dragana Petrović
- Faculty of Natural Sciences and Mathematics, University of Montenegro, 81000 Podgorica, Montenegro
| | - Miljan Bigović
- Faculty of Natural Sciences and Mathematics, University of Montenegro, 81000 Podgorica, Montenegro
| | - Sladjana Krivokapić
- Faculty of Natural Sciences and Mathematics, University of Montenegro, 81000 Podgorica, Montenegro
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3
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Speciation of organotin compounds in water and seafood samples by online hyphenation of porous polymer-based magnetism-enhanced in-tube solid phase microextraction and HPLC. Anal Chim Acta 2022; 1223:340175. [DOI: 10.1016/j.aca.2022.340175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 06/25/2022] [Accepted: 07/13/2022] [Indexed: 11/23/2022]
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Metelkova L, Zhakovskaya Z, Kukhareva G, Voskoboinikov G, Zimina O. Organotin compounds (OTs) in surface sediments, bivalves and algae from the Russian coast of the Barents Sea (Kola Peninsula) and the Fram Strait (Svalbard Archipelago). ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:34659-34669. [PMID: 35040051 DOI: 10.1007/s11356-021-18091-0] [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: 05/03/2021] [Accepted: 12/09/2021] [Indexed: 06/14/2023]
Abstract
Organotin pollution in components of benthic ecosystems was investigated in 2019 in the Barents Sea (South shore, Kola Peninsula) and the Fram Strait (Icefjord, Svalbard Archipelago). Six species of organotin compounds (OTs), including monobutyltin, dibutyltin, tributyltin, tetrabutyltin, triphenyltin and tricyclohexyltin, were measured in the surface sediments, bivalve molluscs (Ciliatocardium ciliatum, Macoma calcarea, Chlamys islandica) and macrophyte algae (Saccharina latissima, Palmaria palmata, Ulvaria obscura, Fucus serratus, Fucus distichus). The results obtained showed moderate contamination of the studied samples with OTs. The total content of six tin compounds was in the ranges 35-139 ng g-1, 13-108 ng g-1 and 2.9-75 ng g-1 (dry weight) in the samples of sediments, bivalves and algae, respectively. In most cases, the concentrations of tributyltin in bottom sediments and mollusc tissues did not exceed the established international regulations. The degradation indices analysis of butyl tin derivatives indicated the active transformation of tributyltin and tetrabutyltin in bottom sediments and macrophyte algae and the accumulation of these compounds in the soft tissues of molluscs. The sediment and mollusc concentrations of OTs measured in this study were comparable to those reported for other areas of the Arctic region.
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Affiliation(s)
- Larisa Metelkova
- St. Petersburg Federal Research Center of the Russian Academy of Sciences (SPC RAS), Scientific Research Centre for Ecological Safety of the Russian Academy of Sciences, 18, Korpusnaya str, St. Petersburg, 197110, Russia.
| | - Zoya Zhakovskaya
- St. Petersburg Federal Research Center of the Russian Academy of Sciences (SPC RAS), Scientific Research Centre for Ecological Safety of the Russian Academy of Sciences, 18, Korpusnaya str, St. Petersburg, 197110, Russia
| | - Galina Kukhareva
- St. Petersburg Federal Research Center of the Russian Academy of Sciences (SPC RAS), Scientific Research Centre for Ecological Safety of the Russian Academy of Sciences, 18, Korpusnaya str, St. Petersburg, 197110, Russia
| | - Grigorii Voskoboinikov
- Murmansk Marine Biological Institute, Russian Academy of Sciences (MMBI RAS), 17, Vladimirskaya str, Murmansk, 183010, Russia
| | - Olga Zimina
- Murmansk Marine Biological Institute, Russian Academy of Sciences (MMBI RAS), 17, Vladimirskaya str, Murmansk, 183010, Russia
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Tang L, Zhang YH, Wang X, Zhang CC, Qin G, Lin Q. Effects of chronic exposure to environmental levels of tributyltin on the lined seahorse (Hippocampus erectus) liver: Analysis of bioaccumulation, antioxidant defense, and immune gene expression. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 801:149646. [PMID: 34416608 DOI: 10.1016/j.scitotenv.2021.149646] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Revised: 08/04/2021] [Accepted: 08/09/2021] [Indexed: 06/13/2023]
Abstract
Tributyltin (TBT), an organotin compound frequently detected in the coastal environments, poses a threat to aquatic organisms. The lined seahorse (Hippocampus erectus) is a vulnerable species found in nearshore water habitats. The mechanisms by which this fish responds to TBT exposure are not yet fully understood. Histological, biochemical, and transcriptional analyses were conducted, and the results showed that 60 days of exposure to 50 and 500 ng/L TBT caused significant tin accumulation and liver damage to seahorses. Antioxidant defenses and immune responses to TBT exposure in the livers of seahorses were further investigated. The enzymatic activity of superoxide dismutase and malondialdehyde content increased, while catalase activity decreased. Transcriptomic analysis revealed that a series of genes involved in the antioxidant defense system were highly induced to protect the hepatic cells from oxidative damage. TBT exposure also resulted in the induction of genes associated with immune and inflammatory processes, representing a stress response to combat the adverse environmental conditions in the exposed seahorses. Furthermore, seahorses showed an increased health risk, according to the elevation of the expression of genes with tumor-promoting effects, when exposed to TBT. These findings contribute to our understanding of the adverse effects of TBT exposure on seahorses, and their potential defense mechanisms.
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Affiliation(s)
- Lu Tang
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Yan-Hong Zhang
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, PR China.
| | - Xin Wang
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, PR China
| | - Can-Chuan Zhang
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Geng Qin
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, PR China
| | - Qiang Lin
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
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6
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Quintas PY, Arias AH, Alvarez MB, Domini CE, Garrido M, Marcovecchio JE. Distribution of Butyltin Compounds in the Coastal Environment of the Bahía Blanca Estuary, Argentina. ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2021; 81:307-323. [PMID: 34268597 DOI: 10.1007/s00244-021-00871-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Accepted: 07/01/2021] [Indexed: 06/13/2023]
Abstract
This study evaluates for the first time the distribution and accumulation of butyltin compounds (BTs) in different compartments such as seawater, sediments, suspended particulate matter (SPM), and mussels (Brachidontes rodriguezii) in the Bahía Blanca estuary. The samples were collected from six sampling sites with different anthropogenic impacts. A better visualization and interpretation of data was achieved using chemometric tools (Tucker4 model), which made it possible to reveal the main relationships among the variables. This analysis showed the presence of BTs in all the estuarine environmental compartments, even in sites with low human intervention. The relationships found among BTs levels, seasons, and environmental matrices show the importance of biological processes such as phytoplankton blooms and remobilization of sediments (by tidal dynamics and/or periodic dredging) in BTs distribution and degradation. In addition, partition coefficients showed that mussels mainly bioaccumulate tributyltin from sediment, water and, to a lesser extent, SPM.
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Affiliation(s)
- Pamela Y Quintas
- Instituto Argentino de Oceanografía (IADO), Universidad Nacional del Sur (UNS)-CONICET, Bahía Blanca, Argentina.
- Laboratorio de Química Analítica para Investigación y Desarrollo (QUIANID), Instituto Interdisciplinario de Ciencias Básicas, Universidad Nacional de Cuyo, Mendoza, Argentina.
| | - Andrés H Arias
- Instituto Argentino de Oceanografía (IADO), Universidad Nacional del Sur (UNS)-CONICET, Bahía Blanca, Argentina
- Departamento de Química, Universidad Nacional del Sur (UNS), Bahía Blanca, Argentina
| | - Mónica B Alvarez
- Departamento de Química, Universidad Nacional del Sur (UNS), Bahía Blanca, Argentina
- INQUISUR, Departamento de Química, Universidad Nacional del Sur (UNS)-CONICET, Av. Alem 1253, 8000, Bahía Blanca, Argentina
| | - Claudia E Domini
- Departamento de Química, Universidad Nacional del Sur (UNS), Bahía Blanca, Argentina
- INQUISUR, Departamento de Química, Universidad Nacional del Sur (UNS)-CONICET, Av. Alem 1253, 8000, Bahía Blanca, Argentina
| | - Mariano Garrido
- Departamento de Química, Universidad Nacional del Sur (UNS), Bahía Blanca, Argentina.
- INQUISUR, Departamento de Química, Universidad Nacional del Sur (UNS)-CONICET, Av. Alem 1253, 8000, Bahía Blanca, Argentina.
| | - Jorge E Marcovecchio
- Instituto Argentino de Oceanografía (IADO), Universidad Nacional del Sur (UNS)-CONICET, Bahía Blanca, Argentina
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Magara G, Elia AC, Dörr AJM, Abete MC, Brizio P, Caldaroni B, Righetti M, Pastorino P, Scoparo M, Prearo M. Metal load and oxidative stress driven by organotin compounds on rainbow trout. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:35012-35022. [PMID: 33665696 PMCID: PMC8275540 DOI: 10.1007/s11356-021-12984-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Accepted: 02/11/2021] [Indexed: 05/17/2023]
Abstract
Tributyltin-based (TBT) antifouling paints, widely used for the treatment of flooded surfaces, have been banned in 2008 for their high environmental persistence and bioaccumulation in aquatic organisms. Although it is still present in aquatic ecosystems, oxidative stress driven by TBT has been still poorly investigated in fish. The aim of the study was to examine the time-course stress responses in liver of rainbow trout that received a single intraperitoneal injection of tributyltin chloride (TBTC) or tributyltin ethoxide (TBTE), both at a dose of 0.05 and 0.5 mg/kg. Levels of metallothioneins, total glutathione, malondialdehyde, superoxide dismutase, catalase, glutathione peroxidase and glutathione S-transferase were evaluated at 3 and 6 days post-injection. Tin load was measured in the muscle of the same fish. Differences were observed in the time-course accumulation of tin with a clear dose-response relationship. Although individual oxidative stress biomarkers varied, the biomarker profile indicated different stress mechanisms caused by both TBTC and TBTE. The weak induction of metal-trapping metallothioneins and the changes of oxidative stress biomarkers suggested a stress-pressure in both TBT-treated trout, advising for an ecotoxicological risk for freshwater ecosystems.
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Affiliation(s)
- Gabriele Magara
- Department of Chemistry, Biology and Biotechnology, University of Perugia, via Elce di Sotto 8, 06123, Perugia, Italy
| | - Antonia Concetta Elia
- Department of Chemistry, Biology and Biotechnology, University of Perugia, via Elce di Sotto 8, 06123, Perugia, Italy.
| | - Ambrosius Josef Martin Dörr
- Department of Chemistry, Biology and Biotechnology, University of Perugia, via Elce di Sotto 8, 06123, Perugia, Italy
| | - Maria Cesarina Abete
- The Veterinary Medical Research Institute for Piemonte, Liguria and Valle d'Aosta, via Bologna 148, 10154, Torino, Italy
| | - Paola Brizio
- The Veterinary Medical Research Institute for Piemonte, Liguria and Valle d'Aosta, via Bologna 148, 10154, Torino, Italy
| | - Barbara Caldaroni
- Department of Chemistry, Biology and Biotechnology, University of Perugia, via Elce di Sotto 8, 06123, Perugia, Italy
| | - Marzia Righetti
- The Veterinary Medical Research Institute for Piemonte, Liguria and Valle d'Aosta, via Bologna 148, 10154, Torino, Italy
| | - Paolo Pastorino
- The Veterinary Medical Research Institute for Piemonte, Liguria and Valle d'Aosta, via Bologna 148, 10154, Torino, Italy
| | - Melissa Scoparo
- Department of Chemistry, Biology and Biotechnology, University of Perugia, via Elce di Sotto 8, 06123, Perugia, Italy
| | - Marino Prearo
- The Veterinary Medical Research Institute for Piemonte, Liguria and Valle d'Aosta, via Bologna 148, 10154, Torino, Italy
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Tang L, Liu YL, Qin G, Lin Q, Zhang YH. Effects of tributyltin on gonad and brood pouch development of male pregnant lined seahorse (Hippocampus erectus) at environmentally relevant concentrations. JOURNAL OF HAZARDOUS MATERIALS 2021; 408:124854. [PMID: 33370696 DOI: 10.1016/j.jhazmat.2020.124854] [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: 09/23/2020] [Revised: 11/26/2020] [Accepted: 12/12/2020] [Indexed: 06/12/2023]
Abstract
The male pregnancy of seahorses is unique, but their reproductive response to environmental disturbances has not yet been clarified. Tributyltin (TBT) is known to have an endocrine disrupting effect on the reproductive system of coastal marine organisms. This study evaluated the potential effects of exposure to environmentally relevant concentrations of TBT on the development of gonads and brood pouch of the lined seahorse (Hippocampus erectus). Physiological, histological, and transcriptional analyses were conducted, and results showed that high levels of TBT bioaccumulation occurred in male and female seahorses. TBT led to ovarian follicular atresia and apoptosis with the elevation of androgen levels, accompanied by the induction of genes associated with lysosomes and autophagosomes. Comparative transcriptional analyses revealed the likely inhibition of spermatogenesis via the suppression of cyclic AMP and androgen synthesis. Notably, the transcriptional profiles showed that TBT potentially affects the immune system, angiogenesis, and embryo nourishment of the brood pouch, which indicates that it has negative effects on the male reproductive system of seahorses. In summary, this study reveals that environmental levels of TBT potentially affect the reproductive efficiency of seahorses, and may ultimately lead to a reduction in their populations in coastal environments.
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Affiliation(s)
- Lu Tang
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China; University of Chinese Academy of Science, Beijing 100049, China
| | - Ya-Li Liu
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
| | - Geng Qin
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
| | - Qiang Lin
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China; University of Chinese Academy of Science, Beijing 100049, China.
| | - Yan-Hong Zhang
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China; University of Chinese Academy of Science, Beijing 100049, China.
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Will JM, Erbacher C, Sperling M, Karst U. A mass spectrometry-based approach gives new insight into organotin-protein interactions. Metallomics 2020; 12:1702-1712. [PMID: 32930317 DOI: 10.1039/d0mt00171f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
In this study, the combination of speciation analysis and native mass spectrometry is presented as a powerful tool to gain new insight into the diverse interactions of environmentally relevant organotin compounds (OTCs) with proteins. Analytical standards of model proteins, such as β-lactoglobulin A (LGA), were thereby incubated with different phenyl- and butyltins. For adduct identification and characterization, the incubated samples were analyzed by inductively coupled plasma-mass spectrometry (ICP-MS) and electrospray ionization-mass spectrometry (ESI-MS) in combination with size exclusion chromatography (SEC). It allowed for a mild separation, which was most crucial to preserve the acid-labile organotin-protein adducts during their analyses. The binding of triorganotin compounds, such as triphenyltin, was shown to be sulfhydryl-directed by using cysteine-specific protein labeling. However, the sole availability of reduced cysteine residues in proteins did not automatically enable adduct formation. This observation complements previous studies and indicates the necessity of a highly specific binding pocket, which was identified for the model protein LGA via enzymatic digestion experiments. In contrast to triorganotins, their natural di- and mono-substituted degradation products, such as dibutyltin, revealed to be less specific regarding their binding to several proteins. Further, it also did not depend on reduced cysteine residues within the protein. In this context, they can probably act as linker molecules, interconnecting proteins, and leading to dimers and probably to higher oligomers. Furthermore, dibutyltin was observed to induce hydrolysis of the protein's peptide backbone at a specific site. Concerning unknown long-term toxic effects, our studies emphasize the importance of future studies on di- and mono-substituted OTCs.
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Affiliation(s)
- Jonas M Will
- Institute of Inorganic and Analytical Chemistry, University of Muenster, Corrensstr. 28/30, 48149 Muenster, Germany.
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