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Eliason O, Malitsky S, Panizel I, Feldmesser E, Porat Z, Sperfeld M, Segev E. The photo-protective role of vitamin D in the microalga Emiliania huxleyi. iScience 2024; 27:109884. [PMID: 38799580 PMCID: PMC11126961 DOI: 10.1016/j.isci.2024.109884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2024] [Revised: 04/16/2024] [Accepted: 04/30/2024] [Indexed: 05/29/2024] Open
Abstract
An essential interaction between sunlight and eukaryotes involves vitamin D production through exposure to ultraviolet (UV) radiation. While extensively studied in vertebrates, the role of vitamin D in non-animal eukaryotes like microalgae remains unclear. Here, we investigate the potential involvement of vitamin D in the UV-triggered response of Emiliania huxleyi, a microalga inhabiting shallow ocean depths that are exposed to UV. Our results show that E. huxleyi produces vitamin D2 and D3 in response to UV. We further demonstrate that E. huxleyi responds to external administration of vitamin D at the transcriptional level, regulating protective mechanisms that are also responsive to UV. Our data reveal that vitamin D addition enhances algal photosynthetic performance while reducing harmful reactive oxygen species buildup. This study contributes to understanding the function of vitamin D in E. huxleyi and its role in non-animal eukaryotes, as well as its potential importance in marine ecosystems.
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Affiliation(s)
- Or Eliason
- Department of Plant and Environmental Sciences, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Sergey Malitsky
- Department of Life Sciences Core Facilities, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Irina Panizel
- Department of Life Sciences Core Facilities, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Ester Feldmesser
- Department of Life Sciences Core Facilities, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Ziv Porat
- Department of Life Sciences Core Facilities, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Martin Sperfeld
- Department of Plant and Environmental Sciences, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Einat Segev
- Department of Plant and Environmental Sciences, Weizmann Institute of Science, Rehovot 7610001, Israel
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2
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López-Ibáñez S, Quade J, Wlodarczyk A, Abad MJ, Beiras R. Marine degradation and ecotoxicity of conventional, recycled and compostable plastic bags. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 351:124096. [PMID: 38703982 DOI: 10.1016/j.envpol.2024.124096] [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: 01/09/2024] [Revised: 04/12/2024] [Accepted: 04/30/2024] [Indexed: 05/06/2024]
Abstract
Plastic bags are currently a major component of marine litter, causing aesthetical nuisance, and undesirable effects on marine fauna that ingest them or are entangled. Plastic litter also rises concern on the ecotoxicological effects due to the potential toxicity of the chemical additives leached in aquatic environments. Conventional plastic bags are made of polyethylene, either from first use or recycled, but regulations restricting single-use plastics and limiting lightweight carrier bags (<50 μm thickness) have fostered the replacement of thin PE bags by compostable materials advertised as safer for the environment. In this study, we assess the degradation of commercially available plastic bags in marine conditions at two scales: aquariums (60 days) and outdoors flow-through mesocosm (120 days). Strength at break point and other tensile strength parameters were used as ecologically relevant endpoints to track mechanical degradation. Ecotoxicity has been assessed along the incubation period using the sensitive Paracentrotus lividus embryo test. Whereas PE bags did not substantially lose their mechanical properties within the 60 d aquarium exposures, compostable bags showed remarkable weight loss and tensile strength decay, some of them fragmenting in the aquarium after 3-4 weeks. Sediment pore water inoculum promoted a more rapid degradation of compostable bags, while nutrient addition pattern did not affect the degradation rate. Longer-term mesocosms exposures supported these findings, as well as pointed out the influence of the microbial processes on the degradation efficiency of compostable/bioplastic bags. Compostable materials, in contrast toPE, showed moderate toxicity on sea-urchin larvae, partially associated to degradation of these materials, but the environmental implications of these findings remain to be assessed. These methods proved to be useful to classify plastic materials, according to their degradability in marine conditions, in a remarkably shorter time than current standard tests and promote new materials safer for the marine fauna.
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Affiliation(s)
- Sara López-Ibáñez
- ECIMAT, Centro de Investigación Mariña (CIM), Universidade de Vigo, 36331, Vigo, Galicia, Spain; Facultade de Ciencias do Mar, Universidade de Vigo, 36310, Vigo, Galicia, Spain.
| | - Jakob Quade
- ECIMAT, Centro de Investigación Mariña (CIM), Universidade de Vigo, 36331, Vigo, Galicia, Spain; RWTH Aachen University, Institute for Environmental Research, Worringer Weg 1, 52074, Aachen, Germany
| | - Angelika Wlodarczyk
- ECIMAT, Centro de Investigación Mariña (CIM), Universidade de Vigo, 36331, Vigo, Galicia, Spain; University of Applied Sciences Technikum Wien, Höchstädtpl. 6, 1200, Vienna, Austria
| | - María-José Abad
- Universidade da Coruña, Campus Industrial de Ferrol, CITENI- Grupo de Polímeros, Campus de Esteiro, Ferrol, Galicia, Spain
| | - Ricardo Beiras
- ECIMAT, Centro de Investigación Mariña (CIM), Universidade de Vigo, 36331, Vigo, Galicia, Spain; Facultade de Ciencias do Mar, Universidade de Vigo, 36310, Vigo, Galicia, Spain
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3
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Powley HR, Polimene L, Torres R, Al Azhar M, Bell V, Cooper D, Holt J, Wakelin S, Artioli Y. Modelling terrigenous DOC across the north west European Shelf: Fate of riverine input and impact on air-sea CO 2 fluxes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:168938. [PMID: 38029982 DOI: 10.1016/j.scitotenv.2023.168938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 11/24/2023] [Accepted: 11/25/2023] [Indexed: 12/01/2023]
Abstract
Terrigenous carbon in aquatic systems is increasingly recognised as an important part of the global carbon cycle. Despite this, the fate and distribution of terrigenous dissolved organic carbon (tDOC) in coastal and oceanic systems is poorly understood. We have implemented a theoretical framework for the degradation of tDOC across the land to ocean continuum in a 3D hydrodynamical-biogeochemical model on the North West European Shelf. A key feature of this model is that both photochemical and bacterial tDOC degradation rates are age dependant constituting an advance in our ability to describe carbon cycling in the marine environment. Over the time period 1986-2015, 182±17 Gmol yr-1 of riverine tDOC is input to the shelf. Results indicate that bacterial degradation is by far the most important process in removing tDOC on the shelf, contributing to 73±6 % (132±11 Gmol yr-1) of the total removal flux, while 21±3 % (39±6 Gmol yr-1) of riverine tDOC was advected away from the shelf and photochemical degradation removing 5±0.5 % of the riverine flux. Explicitly including tDOC in the model decreased the air-sea carbon dioxide (CO2) flux by 112±8 Gmol yr-1 (4±0.4 %), an amount approximately equivalent to the CO2 released by the UK chemical industry in 2020. The reduction is equivalent to 62 % of the riverine tDOC input to the shelf while approximately 17 % of riverine input is incorporated into the foodweb. This work can improve the assumptions of the fate of tDOC by Earth System Models and demonstrates that the inclusion of tDOC in models can impact ecosystem dynamics and change predicted global carbon budgets for the ocean.
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Affiliation(s)
- Helen R Powley
- Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth PL1 3DH, UK.
| | - Luca Polimene
- Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth PL1 3DH, UK
| | - Ricardo Torres
- Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth PL1 3DH, UK
| | - Muchamad Al Azhar
- Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth PL1 3DH, UK
| | - Victoria Bell
- UK Centre for Ecology and Hydrology, Benson Lane, Crowmarsh Gifford, Wallingford, Oxfordshire OX10 8BB, UK
| | - David Cooper
- UK Centre for Ecology and Hydrology, Bangor, ECW Building, Deiniol Rd., Bangor LL57 2UW, UK
| | - Jason Holt
- National Oceanography Centre, 6 Brownlow Street, Liverpool L3 5DA, UK
| | - Sarah Wakelin
- National Oceanography Centre, 6 Brownlow Street, Liverpool L3 5DA, UK
| | - Yuri Artioli
- Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth PL1 3DH, UK
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4
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Clarke RG, Klapstein SJ, Keenan R, O'Driscoll NJ. Salinity and total suspended solids control mercury speciation in a tidal river: Comparisons with a photochemical mercury model. CHEMOSPHERE 2023; 344:140313. [PMID: 37775057 DOI: 10.1016/j.chemosphere.2023.140313] [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: 05/26/2023] [Revised: 09/25/2023] [Accepted: 09/26/2023] [Indexed: 10/01/2023]
Abstract
Daytime volatilization of gaseous elemental mercury (Hg(0)aq) is a significant mechanism for mercury removal from aquatic systems and potentially limits the production and bioaccumulation of methylmercury. Changes in incoming solar radiation (in the ultraviolet range), dissolved organic matter, salinity, and total suspended particles were investigated concurrently with several mercury species (Hg(0)aq, dissolved total mercury (THg), easily reducible mercury (ERM), and mercury associated with total suspended solids (THgTSS)) during daylight hours near the mouth of a hypertidal river. There were no predictable temporal changes observed for Hg(0)aq in unfiltered surface water. Hg(0)aq ranged from 0 to 12 pg L-1, THg ranged from 0 to 492 pg L-1, ERM ranged from 13 to 381 pg L-1, and THgTSS ranged from <1.58 ng g-1 to 261.32 ng g-1. The range of Hg(0)aq predicted by the empirical model was similar to measured ERM concentrations, but it was shown that ERM did not significantly predict in-situ photoreducible Hg(II) (Hg(II)RED). Production of Hg(0)aq appears to largely be suppressed by suspended solids, which limits ultraviolet radiation transmission through surface water. Comparison of these results to an empirical model developed for this site to predict Hg(0)aq indicates that significantly more mercury is available for photoreduction near the mouth of the tidal river, and that Hg(II) will likely photoreduce quickly when TSS levels decrease with ocean mixing.
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Affiliation(s)
- Rachel G Clarke
- . Department of Earth & Environmental Science. Acadia University, Wolfville, Nova Scotia, B4P 2R6, Canada.
| | - Sara J Klapstein
- . Department of Earth & Environmental Science. Acadia University, Wolfville, Nova Scotia, B4P 2R6, Canada
| | - Robert Keenan
- . Environment and Climate Change Canada, Dartmouth, Nova Scotia, B2Y 2N6, Canada
| | - Nelson J O'Driscoll
- . Department of Earth & Environmental Science. Acadia University, Wolfville, Nova Scotia, B4P 2R6, Canada
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5
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Zhang Z, Gao C, Lu Z, Xie X, You J, Li Z. Sunlight-directed fluorophore-switch in photosynthesis of cyanine subcellular organelle markers for bio-imaging. Biosens Bioelectron 2023; 237:115485. [PMID: 37348191 DOI: 10.1016/j.bios.2023.115485] [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: 05/11/2023] [Revised: 06/14/2023] [Accepted: 06/15/2023] [Indexed: 06/24/2023]
Abstract
The photoconvertible fluorophore synthesis enables the light controlled imaging channels switch for accurate tracking the quantity and localization of intracellular biomolecules in chemical biology. Herein, we repurposed the photochemistry of Fischer's base and developed a sunlight-directed fluorophore-switch strategy for high-efficiency trimethine cyanine (Cy3.5/Cy3) synthesis. The unexpected sunlight-directed photoconversion of Fischer's base proceeds in conventional solvents and accelerates in chloroform via photo-oxidation and hydrogen atom transfer without using extra additives, and the heterogenous dimerization mechanism was proposed and confirmed by isolation of the reactive intermediates. The reliable strategy is employed in the photosynthesis of commercially available cytomembrane marker (DiI) and other cyanine based organelle markers with appreciable yields. Sunlight-controlled fluorophore-switch of subcellular organelle markers in living cells validated the feasibility of our strategy with cell-tolerant character. Moreover, remote control synthesis of Cy3.5 in vivo directed via sunlight further demonstrated the extended application of our strategy. Therefore, this sunlight-directed strategy will facilitate exploitation of cyanine-based probes with switched fluorescence imaging channels and further enable precise description of the dynamic variations in living cells with minimal autofluorescence and cellular disturbance.
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Affiliation(s)
- Zhiyong Zhang
- Key Laboratory of Life-Organic Analysis of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165, PR China; State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, PR China
| | - Chunyu Gao
- Key Laboratory of Life-Organic Analysis of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165, PR China; State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, PR China
| | - Zhihao Lu
- Key Laboratory of Life-Organic Analysis of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165, PR China
| | - Xiunan Xie
- Key Laboratory of Life-Organic Analysis of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165, PR China
| | - Jinmao You
- Key Laboratory of Life-Organic Analysis of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165, PR China
| | - Zan Li
- Key Laboratory of Life-Organic Analysis of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165, PR China; State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, PR China.
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6
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Kan D, Zhang Y, Zeng J, Lian H, Feng L, Feng Y, Liu X, Han C, Yang J. Physiological response and molecular mechanisms against UV-B radiation in Brachionus asplanchnoidis (Rotifera). ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 262:115319. [PMID: 37542982 DOI: 10.1016/j.ecoenv.2023.115319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 07/24/2023] [Accepted: 07/31/2023] [Indexed: 08/07/2023]
Abstract
Ultraviolet B (UV-B, 280-320 nm) radiation is a major environmental stressor for aquatic organisms on Earth's surface. Its effects on biological systems are well known, but the mechanisms by which organisms respond and adapt to UV-B radiation are still being explored. In this study, we investigated the effects of UV-B radiation on the monogonont rotifer Brachionus asplanchnoidis, focusing on physiological parameters, antioxidant systems, DNA damage, and DNA repair-related molecular mechanism. Our results showed that the LD50 was at 28.53 kJ/m2, indicating strong tolerance to UV-B. However, UV-B radiation caused adverse effects on growth and reproduction, with shortened reproductive period and longevity, decreased fecundity and hatchability, and inhibition of population growth. Biochemical analyses revealed severe oxidative damage and lipid peroxidation, with increased ROS and MDA levels. Activities of antioxidant enzymes were highly induced at low doses but decreased at high doses. DNA damage also occurred in UV-B-exposed rotifers. Furthermore, selected DNA repair-related genes were up-regulated in a dose-dependent manner. These findings provide a comprehensive understanding of the effects of UV-B radiation on rotifers and highlight the importance of considering both ecological and molecular responses in assessing the impact of UV-B radiation on aquatic organisms.
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Affiliation(s)
- Dongqi Kan
- School of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu Province 210023, People's Republic of China
| | - Yu Zhang
- School of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu Province 210023, People's Republic of China
| | - Jiancheng Zeng
- School of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu Province 210023, People's Republic of China
| | - Hairong Lian
- School of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu Province 210023, People's Republic of China; School of Ecology and Environment, Anhui Normal University, Wuhu, Anhui Province 241002, People's Republic of China
| | - Lei Feng
- School of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu Province 210023, People's Republic of China
| | - Yifan Feng
- School of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu Province 210023, People's Republic of China
| | - Xiaojie Liu
- School of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu Province 210023, People's Republic of China
| | - Cui Han
- School of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu Province 210023, People's Republic of China
| | - Jiaxin Yang
- School of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu Province 210023, People's Republic of China.
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7
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Okubo R, Yamamoto A, Kurima A, Sakabe T, Ide Y, Isobe A. Estimation of the age of polyethylene microplastics collected from oceans: Application to the western North Pacific Ocean. MARINE POLLUTION BULLETIN 2023; 192:114951. [PMID: 37172339 DOI: 10.1016/j.marpolbul.2023.114951] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 03/29/2023] [Accepted: 04/12/2023] [Indexed: 05/14/2023]
Abstract
The knowledge of microplastic (MP) age could aid the deduction of the origin and fate of a fragment carried by ocean currents over long time periods and distances. The present study developed a novel method to estimate the age of MPs (i.e., UV radiation exposure time) using the oxidation level of polyethylene (i.e., carbonyl index) from infrared spectrometry, ultraviolet erythemal radiation (UVER) data, and ambient seawater temperatures. Accelerated and outdoor exposure experiments were conducted to establish relationships among the temporally integrated UVER, ambient temperature, and carbonyl index. Thereafter, the age of MPs was computed, with Miyakojima Island serving as the reference location. The estimated ages of MPs collected from the western North Pacific Ocean ranged from 1 to 3 years, and those MPs from nearshore waters ranged from 0 to 5 years.
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Affiliation(s)
- Rie Okubo
- Platform Laboratory for Science & Technology, Asahi Kasei Corporation, 2-1 Samejima, Fuji-shi, Shizuoka 416-8501, Japan.
| | - Aguru Yamamoto
- Platform Laboratory for Science & Technology, Asahi Kasei Corporation, 2-1 Samejima, Fuji-shi, Shizuoka 416-8501, Japan
| | - Akihiro Kurima
- Platform Laboratory for Science & Technology, Asahi Kasei Corporation, 2-1 Samejima, Fuji-shi, Shizuoka 416-8501, Japan
| | - Terumi Sakabe
- Platform Laboratory for Science & Technology, Asahi Kasei Corporation, 2-1 Samejima, Fuji-shi, Shizuoka 416-8501, Japan
| | - Youichiroh Ide
- Circular Economy Project, Emerging IT Dept. Informatics Initiative Digital Value Co-Creation, Asahi Kasei Corporation, Yurakucho, Chiyoda- Ku, Tokyo 100-0006, Japan
| | - Atsuhiko Isobe
- Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-Koen, Kasuga 816-8580, Japan
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8
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Wang B, Zhang P, Wang Q, Zou S, Song J, Zhang F, Liu G, Zhang L. Protective Effects of a Jellyfish-Derived Thioredoxin Fused with Cell-Penetrating Peptide TAT-PTD on H 2O 2-Induced Oxidative Damage. Int J Mol Sci 2023; 24:ijms24087340. [PMID: 37108504 PMCID: PMC10138494 DOI: 10.3390/ijms24087340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 04/03/2023] [Accepted: 04/04/2023] [Indexed: 04/29/2023] Open
Abstract
Thioredoxin (Trx) plays a critical role in maintaining redox balance in various cells and exhibits anti-oxidative, anti-apoptotic, and anti-inflammatory effects. However, whether exogenous Trx can inhibit intracellular oxidative damage has not been investigated. In previous study, we have identified a novel Trx from the jellyfish Cyanea capillata, named CcTrx1, and confirmed its antioxidant activities in vitro. Here, we obtained a recombinant protein, PTD-CcTrx1, which is a fusion of CcTrx1 and protein transduction domain (PTD) of HIV TAT protein. The transmembrane ability and antioxidant activities of PTD-CcTrx1, and its protective effects against H2O2-induced oxidative damage in HaCaT cells were also detected. Our results revealed that PTD-CcTrx1 exhibited specific transmembrane ability and antioxidant activities, and it could significantly attenuate the intracellular oxidative stress, inhibit H2O2-induced apoptosis, and protect HaCaT cells from oxidative damage. The present study provides critical evidence for application of PTD-CcTrx1 as a novel antioxidant to treat skin oxidative damage in the future.
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Affiliation(s)
- Bo Wang
- Department of Marine Biomedicine and Polar Medicine, Naval Special Medical Center, Naval Medical University, Shanghai 200433, China
- Department of Infectious Disease, No. 971 Hospital of the PLA Navy, Qingdao 266071, China
| | - Peipei Zhang
- Department of Marine Biological Injury and Dermatology, Naval Special Medical Center, Naval Medical University, Shanghai 200052, China
| | - Qianqian Wang
- Department of Marine Biomedicine and Polar Medicine, Naval Special Medical Center, Naval Medical University, Shanghai 200433, China
| | - Shuaijun Zou
- Department of Marine Biomedicine and Polar Medicine, Naval Special Medical Center, Naval Medical University, Shanghai 200433, China
| | - Juxingsi Song
- Department of Marine Biomedicine and Polar Medicine, Naval Special Medical Center, Naval Medical University, Shanghai 200433, China
| | - Fuhai Zhang
- Department of Marine Biomedicine and Polar Medicine, Naval Special Medical Center, Naval Medical University, Shanghai 200433, China
| | - Guoyan Liu
- Department of Marine Biomedicine and Polar Medicine, Naval Special Medical Center, Naval Medical University, Shanghai 200433, China
| | - Liming Zhang
- Department of Marine Biomedicine and Polar Medicine, Naval Special Medical Center, Naval Medical University, Shanghai 200433, China
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9
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Alloy MM, Finch BE, Ward CP, Redman AD, Bejarano AC, Barron MG. Recommendations for advancing test protocols examining the photo-induced toxicity of petroleum and polycyclic aromatic compounds. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2023; 256:106390. [PMID: 36709615 PMCID: PMC10519366 DOI: 10.1016/j.aquatox.2022.106390] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 12/06/2022] [Accepted: 12/07/2022] [Indexed: 06/18/2023]
Abstract
Photo-induced toxicity of petroleum products and polycyclic aromatic compounds (PACs) is the enhanced toxicity caused by their interaction with ultraviolet radiation and occurs by two distinct mechanisms: photosensitization and photomodification. Laboratory approaches for designing, conducting, and reporting of photo-induced toxicity studies are reviewed and recommended to enhance the original Chemical Response to Oil Spills: Ecological Research Forum (CROSERF) protocols which did not address photo-induced toxicity. Guidance is provided on conducting photo-induced toxicity tests, including test species, endpoints, experimental design and dosing, light sources, irradiance measurement, chemical characterization, and data reporting. Because of distinct mechanisms, aspects of photosensitization (change in compound energy state) and photomodification (change in compound structure) are addressed separately, and practical applications in laboratory and field studies and advances in predictive modeling are discussed. One goal for developing standardized testing protocols is to support lab-to-field extrapolations, which in the case of petroleum substances often requires a modeling framework to account for differential physicochemical properties of the constituents. Recommendations are provided to promote greater standardization of laboratory studies on photo-induced toxicity, thus facilitating comparisons across studies and generating data needed to improve models used in oil spill science.
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Affiliation(s)
- Matthew M Alloy
- Office of Research and Development, US EPA, Cincinnati, OH, USA.
| | - Bryson E Finch
- Department of Ecology, State of Washington, Lacey, WA, USA
| | - Collin P Ward
- Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, USA
| | | | | | - Mace G Barron
- Office of Research & Development, US EPA, Gulf Breeze, FL, USA
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10
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Johnson LE, Treible LM. Hanging under the ledge: synergistic consequences of UVA and UVB radiation on scyphozoan polyp reproduction and health. PeerJ 2023; 11:e14749. [PMID: 36751631 PMCID: PMC9899436 DOI: 10.7717/peerj.14749] [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: 08/19/2022] [Accepted: 12/27/2022] [Indexed: 02/05/2023] Open
Abstract
Overexposure to ultraviolet radiation (UVR) emitted by the sun can damage and kill living cells in animals, plants, and microorganisms. In aquatic environments, UVR can penetrate nearly 47 m into the water column, severely impacting many marine organisms. Jellyfish are often considered resilient to environmental stressors, potentially explaining their success in environmentally disturbed areas, but the extent of their resilience to UVR is not well known. Here, we tested resiliency to UVR by exposing benthic polyps of the moon jellyfish, Aurelia sp., to UVA and UVB-the two types of UVR that reach Earth's surface-both separately and in combination. We quantified asexual reproduction rates and polyp attachment to hard substrate, in addition to qualitative observations of polyp health. There were no differences in asexual reproduction rates between polyps exposed to isolated UVA and polyps that received no UVR. Polyps reproduced when exposed to short term (∼7-9 days) isolated UVB, but long-term exposure limited reproduction and polyp attachment to the substrate. When exposed to both UVA and UVB, polyps were unable to feed and unable to remain attached to the substrate, did not reproduce, and ultimately, experienced 100% mortality within 20 days. Although many studies only examine the effects of UVB, the combination of UVA and UVB here resulted in greater negative impacts than either form of UVR in isolation. Therefore, studies that only examine effects of UVB potentially underestimate environmentally relevant effects of UVR. These results suggest that polyps are unsuccessful under UVR stress, so the planula larval stage must settle in low-UVR environments to establish the success of the polyp stage.
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Affiliation(s)
- Lauren E. Johnson
- Institute for Coastal Plain Science, Georgia Southern University, Statesboro, GA, United States of America,Department of Biology, Washington University in St. Louis, St. Louis, MO, United States of America
| | - Laura M. Treible
- Institute for Coastal Plain Science, Georgia Southern University, Statesboro, GA, United States of America,Skidaway Institute of Oceanography, University of Georgia, Savannah, GA, United States of America
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11
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Santos MBD, Londero JEL, Mainardi ÁA, Cechin SZ, Schuch AP. Genotoxic risk assessment of solar UV radiation in tadpoles from Brazilian wetlands. MUTATION RESEARCH. GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2023; 885:503578. [PMID: 36669814 DOI: 10.1016/j.mrgentox.2022.503578] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Revised: 11/03/2022] [Accepted: 12/07/2022] [Indexed: 12/14/2022]
Abstract
Solar ultraviolet (UV) radiation is an environmental genotoxic factor linked to amphibian decline. Here we assessed the genotoxic risk of UVB and UVA exposure for tadpoles from open ponds in southern Brazil, a mid-latitude region influenced by stratospheric ozone depletion. Daily UV doses were measured on the surface of a pond in Taim Ecological Station (TAIM; 32°49'24''S; 52°38'31''W) on a cloudless summer day to predict the worst-case scenario for UV-induced DNA damage. Pond descriptors were related to the use of microhabitats by Boana pulchella tadpoles in two ponds over the climate seasons of 2013 and 2014. Our results indicate that shaded microhabitats were more frequent than unshaded ones in autumn, winter, and spring but not in summer. Hence, the penetration of UV radiation into the water of unshaded microhabitats was evaluated through laboratory experiments with artificial UV sources and pond water samples. Physical and biological sensors were applied in the experiments to measure the incident UV radiation and its genotoxic action. By integrating field and laboratory data, we demonstrate that low doses of biologically effective UV radiation reached the tadpoles in autumn, winter, spring, and early summer due to a high proportion of shaded microhabitats and a high concentration of solids in unshaded microhabitats. However, the relative reduction of shaded microhabitats jointly with a declining water level in late summer may have exposed tadpoles to high UV doses. Our experiments also indicate that solar UVB radiation, but not UVA, is primarily responsible for the induction of DNA pyrimidine dimers in organisms living under the surface of aquatic ecosystems. The present work highlights the determinant role of wetland descriptors for minimizing the genotoxic potential of UV radiation and its consequences for amphibians.
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Affiliation(s)
- Maurício Beux Dos Santos
- Federal University of Santa Maria, Department of Biochemistry and Molecular Biology, Post-Graduation Program in Biological Sciences: Toxicological Biochemistry, Santa Maria, RS, Brazil
| | - James Eduardo Lago Londero
- Federal University of Santa Maria, Department of Biochemistry and Molecular Biology, Post-Graduation Program in Biological Sciences: Toxicological Biochemistry, Santa Maria, RS, Brazil
| | - Álvaro Augusto Mainardi
- Federal University of Santa Maria, Post-Graduation Program in Animal Biodiversity, Santa Maria, RS, Brazil
| | - Sonia Zanini Cechin
- Federal University of Santa Maria, Post-Graduation Program in Animal Biodiversity, Santa Maria, RS, Brazil
| | - André Passaglia Schuch
- Federal University of Santa Maria, Department of Biochemistry and Molecular Biology, Post-Graduation Program in Biological Sciences: Toxicological Biochemistry, Santa Maria, RS, Brazil; Federal University of Santa Maria, Post-Graduation Program in Animal Biodiversity, Santa Maria, RS, Brazil.
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12
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Andrady AL, Barnes PW, Bornman JF, Gouin T, Madronich S, White CC, Zepp RG, Jansen MAK. Oxidation and fragmentation of plastics in a changing environment; from UV-radiation to biological degradation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 851:158022. [PMID: 35970458 PMCID: PMC9765214 DOI: 10.1016/j.scitotenv.2022.158022] [Citation(s) in RCA: 46] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 08/09/2022] [Accepted: 08/10/2022] [Indexed: 05/26/2023]
Abstract
Understanding the fate of plastics in the environment is of critical importance for the quantitative assessment of the biological impacts of plastic waste. Specially, there is a need to analyze in more detail the reputed longevity of plastics in the context of plastic degradation through oxidation and fragmentation reactions. Photo-oxidation of plastic debris by solar UV radiation (UVR) makes material prone to subsequent fragmentation. The fragments generated following oxidation and subsequent exposure to mechanical stresses include secondary micro- or nanoparticles, an emerging class of pollutants. The paper discusses the UV-driven photo-oxidation process, identifying relevant knowledge gaps and uncertainties. Serious gaps in knowledge exist concerning the wavelength sensitivity and the dose-response of the photo-fragmentation process. Given the heterogeneity of natural UV irradiance varying from no exposure in sediments to full UV exposure of floating, beach litter or air-borne plastics, it is argued that the rates of UV-driven degradation/fragmentation will also vary dramatically between different locations and environmental niches. Biological phenomena such as biofouling will further modulate the exposure of plastics to UV radiation, while potentially also contributing to degradation and/or fragmentation of plastics independent of solar UVR. Reductions in solar UVR in many regions, consequent to the implementation of the Montreal Protocol and its Amendments for protecting stratospheric ozone, will have consequences for global UV-driven plastic degradation in a heterogeneous manner across different geographic and environmental zones. The interacting effects of global warming, stratospheric ozone and UV radiation are projected to increase UV irradiance at the surface in localized areas, mainly because of decreased cloud cover. Given the complexity and uncertainty of future environmental conditions, this currently precludes reliable quantitative predictions of plastic persistence on a global scale.
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Affiliation(s)
- A L Andrady
- Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC, USA
| | - P W Barnes
- Biological Sciences and Environmental Program, Loyola University New Orleans, New Orleans, LA, USA
| | - J F Bornman
- Food Futures Institute, Murdoch University, Perth, Australia
| | - T Gouin
- TG Environmental Research, Sharnbrook, Bedfordshire, UK
| | - S Madronich
- Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
| | | | - R G Zepp
- ORD/CEMM, US Environmental Protection Agency, Athens, GA, USA
| | - M A K Jansen
- School of BEES, Environmental Research Institute, University College Cork, Cork, Ireland.
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13
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Kwok ACM, Li C, Lam WT, Wong JTY. Responses of dinoflagellate cells to ultraviolet-C irradiation. Environ Microbiol 2022; 24:5936-5950. [PMID: 35837869 DOI: 10.1111/1462-2920.16135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 06/30/2022] [Accepted: 07/09/2022] [Indexed: 01/12/2023]
Abstract
Dinoflagellates are important aquatic microbes and major harmful algal bloom (HAB) agents that form invasive species through ship ballast transfer. UV-C installations are recommended for ballast treatments and HAB controls, but there is a lack of knowledge in dinoflagellate responses to UV-C. We report here dose-dependent cell cycle delay and viability loss of dinoflagellate cells irradiated with UV-C, with significant proliferative reduction at 800 Jm-2 doses or higher, but immediate LD50 was in the range of 2400-3200 Jm-2 . At higher dosages, some dinoflagellate cells surprisingly survived after days of recovery incubation, and continued viability loss, with samples exhibiting DNA fragmentations per proliferative resumption. Sequential cell cycle postponements, suggesting DNA damages were repaired over one cell cycle, were revealed with flow cytometric analysis and transcriptomic analysis. Over a sustained level of other DNA damage repair pathways, transcript elevation was observed only for several components of base pair repair and mismatch repair. Cumulatively, our findings demonstrated special DNA damage responses in dinoflagellate cells, which we discussed in relation to their unique chromo-genomic characters, as well as indicating resilience of dinoflagellate cells to UV-C.
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Affiliation(s)
- Alvin Chun Man Kwok
- Division of Life Science, Hong Kong University of Science and Technology, Kowloon, Hong Kong
| | - Chongping Li
- Division of Life Science, Hong Kong University of Science and Technology, Kowloon, Hong Kong.,Department of Ocean Science, Hong Kong University of Science and Technology, Kowloon, Hong Kong
| | - Wing Tai Lam
- Division of Life Science, Hong Kong University of Science and Technology, Kowloon, Hong Kong
| | - Joseph Tin Yum Wong
- Division of Life Science, Hong Kong University of Science and Technology, Kowloon, Hong Kong
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14
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Picard MMM, Johnson LE, Côté IM. Effects of sediment on spore performance as a potential constraint on kelp distribution. MARINE POLLUTION BULLETIN 2022; 185:114336. [PMID: 36372050 DOI: 10.1016/j.marpolbul.2022.114336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 09/24/2022] [Accepted: 10/31/2022] [Indexed: 06/16/2023]
Abstract
Kelp habitats contribute to marine productivity and diversity, making understanding the constraints on their distribution important. In the Gulf of St. Lawrence, Alaria esculenta occupies a subset of Saccharina latissima's range. Since tolerance to sedimentation by early life stages was suggested to cause this contrasting distribution, we tested the influence of sediment levels on spore attachment and development. For both species, the proportion of attached spores that developed decreased with increasing sediment. However, spore attachment and gametophyte density increased with sediment concentration but only for Saccharina. At the maximum sediment level examined, spore attachment and gametophyte densities of the two species were similar, contrary to the idea that sediment effects on early life stages explain differences in adult distribution. Further investigation, particularly with higher sediment loads, is required to confirm this conclusion. As turbidity is increasing globally, understanding the mechanisms underpinning changes in seaweed distribution will facilitate appropriate local-scale management.
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Affiliation(s)
- Manon M M Picard
- Department of Biological Sciences, Simon Fraser University, Burnaby, BC V5A 1S6, Canada.
| | - Ladd E Johnson
- Québec-Océan, Département de biologie, Université Laval, Québec, QC G1V 0A6, Canada
| | - Isabelle M Côté
- Department of Biological Sciences, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
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15
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Tamre E, Fournier GP. Inferred ancestry of scytonemin biosynthesis proteins in cyanobacteria indicates a response to Paleoproterozoic oxygenation. GEOBIOLOGY 2022; 20:764-775. [PMID: 35851984 PMCID: PMC9796282 DOI: 10.1111/gbi.12514] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 04/20/2022] [Accepted: 07/02/2022] [Indexed: 06/15/2023]
Abstract
Protection from radiation damage is an important adaptation for phototrophic microbes. Living in surface, shallow water, and peritidal environments, cyanobacteria are especially exposed to long-wavelength ultraviolet (UVA) radiation. Several groups of cyanobacteria within these environments are protected from UVA damage by the production of the pigment scytonemin. Paleontological evidence of cyanobacteria in UVA-exposed environments from the Proterozoic, and possibly as early as the Archaean, suggests a long evolutionary history of radiation protection within this group. We show that phylogenetic analyses of enzymes in the scytonemin biosynthesis pathway support this hypothesis and reveal a deep history of vertical inheritance of this pathway within extant cyanobacterial diversity. Referencing this phylogeny to cyanobacterial molecular clocks suggests that scytonemin production likely appeared during the early Proterozoic, soon after the Great Oxygenation Event. This timing is consistent with an adaptive scenario for the evolution of scytonemin production, wherein the threat of UVA-generated reactive oxygen species becomes significantly greater once molecular oxygen is more pervasive across photosynthetic environments.
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Affiliation(s)
- Erik Tamre
- Department of Earth, Atmospheric and Planetary SciencesMassachusetts Institute of TechnologyCambridgeMassachusettsUSA
| | - Gregory P. Fournier
- Department of Earth, Atmospheric and Planetary SciencesMassachusetts Institute of TechnologyCambridgeMassachusettsUSA
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16
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Araújo MJ, Quintaneiro C, Rocha RJM, Pousão-Ferreira P, Candeias-Mendes A, Soares AMVM, Monteiro MS. Single and combined effects of ultraviolet radiation and triclosan during the metamorphosis of Solea senegalensis. CHEMOSPHERE 2022; 307:135583. [PMID: 35792207 DOI: 10.1016/j.chemosphere.2022.135583] [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: 05/20/2022] [Revised: 06/27/2022] [Accepted: 06/29/2022] [Indexed: 06/15/2023]
Abstract
Ultraviolet radiation (UV) and triclosan (TCS) affect the early development of marine fish; however, the corresponding molecular mechanisms are still not fully understood. Therefore, this work aims to study the effects of the single and combined exposure to these stressors during the thyroid-regulated metamorphosis of the flatfish Solea senegalensis. Sub-lethal exposure (5.89 kJ m-2 UV and/or 0.546 and 1.090 mg L-1 TCS for 48 h) was performed at the beginning of metamorphosis (13 days after hatching, dah), followed by a period in clean media until complete metamorphosis (24 dah). Malformations, metamorphosis progression, length, behavior and the expression of thyroid axis-related genes were studied. TCS induced malformations, decreased swimming performance, and induced metamorphosis acceleration at 15 dah, followed by a significant metamorphosis delay. Such effects were more noticeable in the presence of UV. The down-regulation of five thyroid axis-related genes occurred after exposure to TCS (15 dah), and after 9 days in clean media two genes were still down-regulated. UV exposure increased the effect of TCS by further down-regulating gene expression immediately after the exposure. Since several effects persisted after the period in clean media, implications of these stressors (mainly TCS) on the ecological performance of the species are suggested.
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Affiliation(s)
- M J Araújo
- CESAM & Dbio, Universidade de Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal; CIIMAR-UP-Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Terminal de Cruzeiros Do Porto de Leixões, Av. General Norton de Matos, S/n, 4450-208, Porto, Portugal.
| | - C Quintaneiro
- CESAM & Dbio, Universidade de Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal
| | - R J M Rocha
- CESAM & Dbio, Universidade de Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal
| | - P Pousão-Ferreira
- IPMA - Portuguese Institute for the Ocean and Atmosphere, EPPO -Aquaculture Research Station, Av. Parque Natural da Ria Formosa S/n, 8700-194, Olhão, Portugal
| | - A Candeias-Mendes
- IPMA - Portuguese Institute for the Ocean and Atmosphere, EPPO -Aquaculture Research Station, Av. Parque Natural da Ria Formosa S/n, 8700-194, Olhão, Portugal
| | - A M V M Soares
- CESAM & Dbio, Universidade de Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal
| | - M S Monteiro
- CESAM & Dbio, Universidade de Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal
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17
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In situ laboratory for plastic degradation in the Red Sea. Sci Rep 2022; 12:11956. [PMID: 35831329 PMCID: PMC9279475 DOI: 10.1038/s41598-022-15310-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Accepted: 06/22/2022] [Indexed: 11/08/2022] Open
Abstract
Degradation and fragmentation of plastics in the environment are still poorly understood. This is partly caused by the lack of long-term studies and methods that determine weathering duration. We here present a novel study object that preserves information on plastic age: microplastic (MP) resin pellets from the wreck of the SS Hamada, a ship that foundered twenty-nine years ago at the coast of Wadi el Gemal national park, Egypt. Its sinking date enabled us to precisely determine how long MP rested in the wreck and a nearby beach, on which part of the load was washed off. Pellets from both sampling sites were analyzed by microscopy, X-ray tomography, spectroscopy, calorimetry, gel permeation chromatography, and rheology. Most pellets were made of low-density polyethylene, but a minor proportion also consisted of high-density polyethylene. MP from inside the wreck showed no signs of degradation compared to pristine reference samples. Contrary, beached plastics exhibited changes on all structural levels, which sometimes caused fragmentation. These findings provide further evidence that plastic degradation under saltwater conditions is comparatively slow, whereas UV radiation and high temperatures on beaches are major drivers of that process. Future long-term studies should focus on underlying mechanisms and timescales of plastic degradation.
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18
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McCartin LJ, Vohsen SA, Ambrose SW, Layden M, McFadden CS, Cordes EE, McDermott JM, Herrera S. Temperature Controls eDNA Persistence across Physicochemical Conditions in Seawater. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:8629-8639. [PMID: 35658125 PMCID: PMC9231374 DOI: 10.1021/acs.est.2c01672] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Revised: 05/21/2022] [Accepted: 05/23/2022] [Indexed: 05/20/2023]
Abstract
Environmental DNA (eDNA) quantification and sequencing are emerging techniques for assessing biodiversity in marine ecosystems. Environmental DNA can be transported by ocean currents and may remain at detectable concentrations far from its source depending on how long it persist. Thus, predicting the persistence time of eDNA is crucial to defining the spatial context of the information derived from it. To investigate the physicochemical controls of eDNA persistence, we performed degradation experiments at temperature, pH, and oxygen conditions relevant to the open ocean and the deep sea. The eDNA degradation process was best explained by a model with two phases with different decay rate constants. During the initial phase, eDNA degraded rapidly, and the rate was independent of physicochemical factors. During the second phase, eDNA degraded slowly, and the rate was strongly controlled by temperature, weakly controlled by pH, and not controlled by dissolved oxygen concentration. We demonstrate that marine eDNA can persist at quantifiable concentrations for over 2 weeks at low temperatures (≤10 °C) but for a week or less at ≥20 °C. The relationship between temperature and eDNA persistence is independent of the source species. We propose a general temperature-dependent model to predict the maximum persistence time of eDNA detectable through single-species eDNA quantification methods.
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Affiliation(s)
- Luke J. McCartin
- Department
of Biological Sciences, Lehigh University, Bethlehem, Pennsylvania 18015-3027, United States
| | - Samuel A. Vohsen
- Department
of Biological Sciences, Lehigh University, Bethlehem, Pennsylvania 18015-3027, United States
| | - Susan W. Ambrose
- Department
of Earth and Environmental Sciences, Lehigh
University, Bethlehem, Pennsylvania 18015-3027, United States
| | - Michael Layden
- Department
of Biological Sciences, Lehigh University, Bethlehem, Pennsylvania 18015-3027, United States
| | - Catherine S. McFadden
- Department
of Biology, Harvey Mudd College, Claremont, California 91711, United States
| | - Erik E. Cordes
- Department
of Biology, Temple University, Philadelphia, Pennsylvania 19122-6008, United States
| | - Jill M. McDermott
- Department
of Earth and Environmental Sciences, Lehigh
University, Bethlehem, Pennsylvania 18015-3027, United States
| | - Santiago Herrera
- Department
of Biological Sciences, Lehigh University, Bethlehem, Pennsylvania 18015-3027, United States
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19
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Udayantha HMV, Samaraweera AV, Liyanage DS, Sandamalika WMG, Lim C, Yang H, Lee JH, Lee S, Lee J. Molecular characterization, antiviral activity, and UV-B damage responses of Caspase-9 from Amphiprion clarkii. FISH & SHELLFISH IMMUNOLOGY 2022; 125:247-257. [PMID: 35588907 DOI: 10.1016/j.fsi.2022.05.023] [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: 09/22/2021] [Revised: 04/18/2022] [Accepted: 05/11/2022] [Indexed: 06/15/2023]
Abstract
Apoptosis plays a vital role in maintaining cellular homeostasis in multicellular organisms. Caspase-9 (casp-9) is one of the major initiator caspases that induces apoptosis by activating downstream intrinsic apoptosis pathway genes. Here, we isolated the cDNA sequence (1992 bp) of caspase-9 from Amphiprion clarkii (Accasp-9) that consists of a 1305 bp coding region and encodes a 434 aa protein. In silico analysis showed that Accasp-9 has a theoretical isoelectric point of 5.81 and a molecular weight of 48.45 kDa. Multiple sequence alignment revealed that the CARD domain is located at the N-terminus, whereas the large P-20 and small P-10 domains are located at the C-terminus. Moreover, a highly conserved pentapeptide active site (296QACGG301), as well as histidine and cysteine active sites, are also retained at the C-terminus. In phylogenetic analysis, Accasp-9 formed a clade with casp-9 from different species, distinct from other caspases. Accasp-9 was highly expressed in the gill and intestine compared with other tissues analyzed in healthy A. clarkii. Accasp-9 expression was significantly elevated in the blood after stimulation with Vibrio harveyi and polyinosinic:polycytidylic acid (poly I:C; 12-48 h), but not with lipopolysaccharide. The nucleoprotein expression of the viral hemorrhagic septicemia virus was significantly reduced in Accasp-9 overexpressed fathead minnow (FHM) cells compared with that in the control. In addition, other in vitro assays revealed that cell apoptosis was significantly elevated in poly I:C and UV-B-treated Accasp-9 transfected FHM cells. However, H248P or C298S mutated Accasp-9 significantly reduced apoptosis in UV-B irradiated cells. Collectively, our results show that Accasp-9 might play a defensive role against invading pathogens and UV-B radiation and H248 and C298 active residues are significantly involved in apoptosis in teleosts.
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Affiliation(s)
- H M V Udayantha
- Department of Marine Life Sciences & Fish Vaccine Research Center, Jeju National University, Jeju, 63243, Republic of Korea
| | - Anushka Vidurangi Samaraweera
- Department of Marine Life Sciences & Fish Vaccine Research Center, Jeju National University, Jeju, 63243, Republic of Korea
| | - D S Liyanage
- Department of Marine Life Sciences & Fish Vaccine Research Center, Jeju National University, Jeju, 63243, Republic of Korea
| | - W M Gayashani Sandamalika
- Department of Marine Life Sciences & Fish Vaccine Research Center, Jeju National University, Jeju, 63243, Republic of Korea
| | - Chaehyeon Lim
- Department of Marine Life Sciences & Fish Vaccine Research Center, Jeju National University, Jeju, 63243, Republic of Korea
| | - Hyerim Yang
- Department of Marine Life Sciences & Fish Vaccine Research Center, Jeju National University, Jeju, 63243, Republic of Korea
| | - Ji Hun Lee
- Department of Marine Life Sciences & Fish Vaccine Research Center, Jeju National University, Jeju, 63243, Republic of Korea
| | - Sukkyoung Lee
- Department of Marine Life Sciences & Fish Vaccine Research Center, Jeju National University, Jeju, 63243, Republic of Korea; Marine Science Institute, Jeju National University, Jeju, 63333, Republic of Korea
| | - Jehee Lee
- Department of Marine Life Sciences & Fish Vaccine Research Center, Jeju National University, Jeju, 63243, Republic of Korea; Marine Science Institute, Jeju National University, Jeju, 63333, Republic of Korea.
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20
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Physiological response of the symbiotic dinoflagellate Pelagodinium béii to ultraviolet radiation: synthesis and accumulation of mycosporine-like amino acids. Symbiosis 2022. [DOI: 10.1007/s13199-022-00839-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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21
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Haber M, Roth Rosenberg D, Lalzar M, Burgsdorf I, Saurav K, Lionheart R, Lehahn Y, Aharonovich D, Gómez-Consarnau L, Sher D, Krom MD, Steindler L. Spatiotemporal Variation of Microbial Communities in the Ultra-Oligotrophic Eastern Mediterranean Sea. Front Microbiol 2022; 13:867694. [PMID: 35464964 PMCID: PMC9022036 DOI: 10.3389/fmicb.2022.867694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Accepted: 03/14/2022] [Indexed: 11/13/2022] Open
Abstract
Marine microbial communities vary seasonally and spatially, but these two factors are rarely addressed together. In this study, the temporal and spatial patterns of the bacterial and archaeal community were studied along a coast-to-offshore transect in the Eastern Mediterranean Sea (EMS) over six cruises, in three seasons of 2 consecutive years. Amplicon sequencing of 16S rRNA genes and transcripts was performed to determine presence and activity, respectively. The ultra-oligotrophic status of the Southeastern Mediterranean Sea was reflected in the microbial community composition dominated by oligotrophic bacterial groups such as SAR11, even at the most coastal station sampled, throughout the year. Seasons significantly affected the microbial communities, explaining more than half of the observed variability. However, the same few taxa dominated the community over the 2-year sampling period, varying only in their degree of dominance. While there was no overall effect of station location on the microbial community, the most coastal site (16 km offshore) differed significantly in community structure and activity from the three further offshore stations in early winter and summer. Our data on the microbial community compositions and their seasonality support previous notions that the EMS behaves like an oceanic gyre.
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Affiliation(s)
- Markus Haber
- Department of Marine Biology, Leon H. Charney School of Marine Sciences, University of Haifa, Haifa, Israel.,Department of Aquatic Microbial Ecology, Institute of Hydrobiology, Biology Centre CAS, České Budějovice, Czechia
| | - Dalit Roth Rosenberg
- Department of Marine Biology, Leon H. Charney School of Marine Sciences, University of Haifa, Haifa, Israel
| | - Maya Lalzar
- Bioinformatics Service Unit, University of Haifa, Haifa, Israel
| | - Ilia Burgsdorf
- Department of Marine Biology, Leon H. Charney School of Marine Sciences, University of Haifa, Haifa, Israel
| | - Kumar Saurav
- Department of Marine Biology, Leon H. Charney School of Marine Sciences, University of Haifa, Haifa, Israel
| | - Regina Lionheart
- The Dr. Moses Strauss Department of Marine Geosciences, Leon H. Charney School of Marine Sciences, University of Haifa, Haifa, Israel
| | - Yoav Lehahn
- The Dr. Moses Strauss Department of Marine Geosciences, Leon H. Charney School of Marine Sciences, University of Haifa, Haifa, Israel
| | - Dikla Aharonovich
- Department of Marine Biology, Leon H. Charney School of Marine Sciences, University of Haifa, Haifa, Israel
| | - Laura Gómez-Consarnau
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, United States.,Department of Biological Oceanography, Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Mexico
| | - Daniel Sher
- Department of Marine Biology, Leon H. Charney School of Marine Sciences, University of Haifa, Haifa, Israel
| | - Michael D Krom
- Department of Marine Biology, Leon H. Charney School of Marine Sciences, University of Haifa, Haifa, Israel.,Morris Kahn Marine Research Station, Environmental Geochemistry Lab., Leon H. Charney School of Marine Sciences, University of Haifa, Haifa, Israel
| | - Laura Steindler
- Department of Marine Biology, Leon H. Charney School of Marine Sciences, University of Haifa, Haifa, Israel
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22
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Wang Y, Lee Z, Ondrusek M, Li X, Zhang S, Wu J. An evaluation of remote sensing algorithms for the estimation of diffuse attenuation coefficients in the ultraviolet bands. OPTICS EXPRESS 2022; 30:6640-6655. [PMID: 35299445 DOI: 10.1364/oe.446114] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Accepted: 12/23/2021] [Indexed: 06/14/2023]
Abstract
In this study, six algorithms (both empirical and semi-analytical) developed for the estimation of Kd in the ultraviolet (UV) domain (specifically 360, 380, and 400 nm) were evaluated from a dataset of 316 stations covering oligotrophic ocean and coastal waters. In particular, the semi-analytical algorithm (Lee et al. 2013) used remote sensing reflectance in these near-blue UV bands estimated from a recently developed deep learning system as the input. For Kd(380) in a range of 0.018 - 2.34 m-1, it is found that the semi-analytical algorithm has the best performance, where the mean absolute relative difference (MARD) is 0.19, and the coefficient of determination (R2) is 0.94. For the empirical algorithms, the MARD values are 0.23-0.90, with R2 as 0.70-0.92, for this evaluation dataset. For a VIIRS and in situ matchup dataset (N = 62), the MARD of Kd(380) is 0.21 (R2 as 0.94) by the semi-analytical algorithm. These results indicate that a combination of deep learning system and semi-analytical algorithms can provide reliable Kd(UV) for past and present satellite ocean color missions that have no spectral bands in the UV, where global Kd(UV) products are required for comprehensive studies of UV radiation on marine primary productivity and biogeochemical processes in the ocean.
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23
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Pasparakis C, Wang Y, Heuer RM, Zhang W, Stieglitz JD, McGuigan CJ, Benetti DD, Scholey VP, Margulies D, Grosell M. Ultraviolet avoidance by embryonic buoyancy control in three species of marine fish. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 806:150542. [PMID: 34582874 DOI: 10.1016/j.scitotenv.2021.150542] [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: 06/06/2021] [Revised: 09/16/2021] [Accepted: 09/19/2021] [Indexed: 05/20/2023]
Abstract
Pelagic fish embryos are thought to float in or near surface waters for the majority of their development and are presumed to have little to no control over their mobility, rendering these embryos at high risk for damages associated with surface stressors such as ultraviolet radiation (UVR). We recently challenged these long-standing paradigms by characterizing a potential mechanism of stressor avoidance in early-life stage mahi-mahi (Coryphaena hippurus) in which embryos sense external cues, such as UVR, and modify their buoyancy to reduce further exposure. It is unknown whether embryos of other marine fish with pelagic spawning strategies have similar capabilities. To fill this knowledge gap, we investigated buoyancy change in response to UVR in three additional species of marine fish that utilize a pelagic spawning strategy: yellowfin tuna (Thunnus albacares), red snapper (Lutjanus campechanus), and cobia (Rachycentron canadum). Embryos of all three species displayed increased specific gravity and loss of buoyancy after exposures to environmentally relevant doses of UVR, a response that may be ubiquitous to fish with pelagic embryos. To gain further insight into this response, we investigated recovery of buoyancy, oxygen consumption, energy depletion, and photolyase induction in response to UVR exposures in at least one of the three species listed above.
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Affiliation(s)
- Christina Pasparakis
- University of Miami, Rosenstiel School of Marine and Atmospheric Science, Miami, FL, USA; University of California Davis, Davis, CA, USA.
| | - Yadong Wang
- University of Miami, Rosenstiel School of Marine and Atmospheric Science, Miami, FL, USA
| | - Rachael M Heuer
- University of Miami, Rosenstiel School of Marine and Atmospheric Science, Miami, FL, USA
| | - Wenlong Zhang
- University of Miami, Rosenstiel School of Marine and Atmospheric Science, Miami, FL, USA
| | - John D Stieglitz
- University of Miami, Rosenstiel School of Marine and Atmospheric Science, Miami, FL, USA
| | - Charles J McGuigan
- University of Miami, Rosenstiel School of Marine and Atmospheric Science, Miami, FL, USA
| | - Daniel D Benetti
- University of Miami, Rosenstiel School of Marine and Atmospheric Science, Miami, FL, USA
| | - Vernon P Scholey
- Inter-American Tropical Tuna Commission, Achotines Laboratory, Panama
| | | | - Martin Grosell
- University of Miami, Rosenstiel School of Marine and Atmospheric Science, Miami, FL, USA
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Zedek F, Veselý P, Tichý L, Elliott TL, Garbolino E, de Ruffray P, Bureš P. Holocentric plants are more competitive under higher UV-B doses. THE NEW PHYTOLOGIST 2022; 233:15-21. [PMID: 34547106 DOI: 10.1111/nph.17750] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2021] [Accepted: 09/08/2021] [Indexed: 05/28/2023]
Affiliation(s)
- František Zedek
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic
| | - Pavel Veselý
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic
| | - Lubomír Tichý
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic
| | - Tammy L Elliott
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic
| | - Emmanuel Garbolino
- Climpact Data Science (CDS), Nova Sophia - Regus Nova, 291 rue Albert Caquot, CS 40095, 06902, Sophia Antipolis Cedex, France
| | - Patrice de Ruffray
- Institut de biologie moléculaire des plantes-CNRS, Université de Strasbourg, 12, rue du Général-Zimmer, F-67084, Strasbourg, France
| | - Petr Bureš
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic
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25
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Cooke GJ, Marsh DR, Walsh C, Black B, Lamarque JF. A revised lower estimate of ozone columns during Earth's oxygenated history. ROYAL SOCIETY OPEN SCIENCE 2022; 9:211165. [PMID: 35070343 PMCID: PMC8728182 DOI: 10.1098/rsos.211165] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Accepted: 11/25/2021] [Indexed: 05/17/2023]
Abstract
The history of molecular oxygen (O2) in Earth's atmosphere is still debated; however, geological evidence supports at least two major episodes where O2 increased by an order of magnitude or more: the Great Oxidation Event (GOE) and the Neoproterozoic Oxidation Event. O2 concentrations have likely fluctuated (between 10-3 and 1.5 times the present atmospheric level) since the GOE ∼2.4 Gyr ago, resulting in a time-varying ozone (O3) layer. Using a three-dimensional chemistry-climate model, we simulate changes in O3 in Earth's atmosphere since the GOE and consider the implications for surface habitability, and glaciation during the Mesoproterozoic. We find lower O3 columns (reduced by up to 4.68 times for a given O2 level) compared to previous work; hence, higher fluxes of biologically harmful UV radiation would have reached the surface. Reduced O3 leads to enhanced tropospheric production of the hydroxyl radical (OH) which then substantially reduces the lifetime of methane (CH4). We show that a CH4 supported greenhouse effect during the Mesoproterozoic is highly unlikely. The reduced O3 columns we simulate have important implications for astrobiological and terrestrial habitability, demonstrating the relevance of three-dimensional chemistry-climate simulations when assessing paleoclimates and the habitability of faraway worlds.
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Affiliation(s)
- G. J. Cooke
- School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK
| | - D. R. Marsh
- School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK
- National Center for Atmospheric Research, Boulder, CO 80301, USA
| | - C. Walsh
- School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK
| | - B. Black
- Department of Earth and Planetary Sciences, Rutgers University, Piscataway, NJ, USA
- Department of Earth and Atmospheric Sciences, CUNY City College, New York, NY, USA
| | - J.-F. Lamarque
- National Center for Atmospheric Research, Boulder, CO 80301, USA
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Abstract
Water is the cellular milieu, drives all biochemistry within Earth's biosphere and facilitates microbe-mediated decay processes. Instead of reviewing these topics, the current article focuses on the activities of water as a preservative-its capacity to maintain the long-term integrity and viability of microbial cells-and identifies the mechanisms by which this occurs. Water provides for, and maintains, cellular structures; buffers against thermodynamic extremes, at various scales; can mitigate events that are traumatic to the cell membrane, such as desiccation-rehydration, freeze-thawing and thermal shock; prevents microbial dehydration that can otherwise exacerbate oxidative damage; mitigates against biocidal factors (in some circumstances reducing ultraviolet radiation and diluting solute stressors or toxic substances); and is effective at electrostatic screening so prevents damage to the cell by the intense electrostatic fields of some ions. In addition, the water retained in desiccated cells (historically referred to as 'bound' water) plays key roles in biomacromolecular structures and their interactions even for fully hydrated cells. Assuming that the components of the cell membrane are chemically stable or at least repairable, and the environment is fairly constant, water molecules can apparently maintain membrane geometries over very long periods provided these configurations represent thermodynamically stable states. The spores and vegetative cells of many microbes survive longer in the presence of vapour-phase water (at moderate-to-high relative humidities) than under more-arid conditions. There are several mechanisms by which large bodies of water, when cooled during subzero weather conditions remain in a liquid state thus preventing potentially dangerous (freeze-thaw) transitions for their microbiome. Microbial life can be preserved in pure water, freshwater systems, seawater, brines, ice/permafrost, sugar-rich aqueous milieux and vapour-phase water according to laboratory-based studies carried out over periods of years to decades and some natural environments that have yielded cells that are apparently thousands, or even (for hypersaline fluid inclusions of mineralized NaCl) hundreds of millions, of years old. The term preservative has often been restricted to those substances used to extend the shelf life of foods (e.g. sodium benzoate, nitrites and sulphites) or those used to conserve dead organisms, such as ethanol or formaldehyde. For living microorganisms however, the ultimate preservative may actually be water. Implications of this role are discussed with reference to the ecology of halophiles, human pathogens and other microbes; food science; biotechnology; biosignatures for life and other aspects of astrobiology; and the large-scale release/reactivation of preserved microbes caused by global climate change.
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Affiliation(s)
- John E. Hallsworth
- Institute for Global Food SecuritySchool of Biological SciencesQueen’s University Belfast19 Chlorine GardensBelfastBT9 5DLUK
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27
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Alves RN, Agustí S. Oxidative stress in tissues of gilthead seabream (Sparus aurata) and European seabass (Dicentrarchus labrax) juveniles exposed to ultraviolet-B radiation. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY 2021. [DOI: 10.1016/j.jpap.2021.100070] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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Yan F, Li L, Yu D, Cui C, Zang S, Xu Z, Wu H. Physiological Responses of Sargassum muticum, a Potential Golden Tide Species, to Different Levels of Light and Nitrogen. Front Ecol Evol 2021. [DOI: 10.3389/fevo.2021.759732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Sargassum golden tides have bloomed frequently in many sea areas throughout the world, and negatively impacted on the local marine ecology. Sargassum muticum commonly inhabits rocky shores. It is now distributed worldwide due to its invasiveness, and recently drifting individuals have been observed on the coasts of Canary Islands. However, as a potential golden tide alga, physiological, and ecological studies of this species have not been frequently explored. To investigate the responses of S. muticum to light and nitrogen, two key environmental factors in golden tide formation, we established three light levels (LL, low light, 10 μmol photons m–2 s–1; ML, medium light, 60 μmol photons m–2 s–1, and HL, high light, 300 μmol photons m–2 s–1) and two nitrogen levels (LN, low nitrogen, 25.0 μM of natural seawater; HN, high nitrogen, 125.0 μM), and cultivated the thalli under different conditions for 12 days before measuring the physiological properties of alga. The results showed that higher light and/or nitrogen levels enhanced the relative algal growth rate. The maximum net photosynthesis rate of alga increased with the light, while it remained unaffected by the nitrogen. The HN treatment had no effect on the apparent photosynthetic efficiency of algae in the LL culture, while increased it in the ML and HL cultures. The irradiance saturation point of photosynthesis was approximately 300 μmol photons m–2 s–1 with no significant difference among the six treatments, except for a slight increase under HLHN in contrast to the LLHN and MLLN treatments. HL treatment decreased the maximum quantum yield of photosynthesis (Fv/Fm) in both nitrogen levels. In the HN culture, ML and HL led to lower values of photoinhibition, indicating higher survivability in the alga. The HN culture led to higher nitrogen uptake but had no effects on Fv/Fm and the contents of pigments and soluble protein, regardless of culture light level. Based on these results, we speculate that drifting individuals of S. muticum would be possible to form a golden tide owing to its rapid growth rate at light level of 300 μmol photons m–2 s–1, when they encountered the sustained lower light level on the sea surface (≤300 μmol photons m–2 s–1). A high nitrogen supply caused by eutrophication of seawater might facilitate this process. Our results provide an important reference for the prediction of golden tides formed by S. muticum.
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29
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Zhang X, Guo Y, Liu G, Liu Y, Song M, Shi J, Hu L, Li Y, Yin Y, Cai Y, Jiang G. Dark Reduction of Mercury by Microalgae-Associated Aerobic Bacteria in Marine Environments. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:14258-14268. [PMID: 34585579 DOI: 10.1021/acs.est.1c03608] [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] [Indexed: 05/20/2023]
Abstract
Redox transformation of mercury (Hg) is critical for Hg exchange at the air-sea interface and it can also affect the methylation of Hg in marine environments. However, the contributions of microalgae and aerobic bacteria in oxic seawater to Hg2+ reduction are largely unknown. Here, we studied the reduction of Hg2+ mediated by microalgae and aerobic bacteria in surface marine water and microalgae cultures under dark and sunlight conditions. The comparable reduction rates of Hg2+ with and without light suggest that dark reduction by biological processes is as important as photochemical reduction in the tested surface marine water and microalgae cultures. The contributions of microalgae, associated free-living aerobic bacteria, and extracellular substances to dark reduction were distinguished and quantified in 7 model microalgae cultures, demonstrating that the associated aerobic bacteria are directly involved in dark Hg2+ reduction. The aerobic bacteria in the microalgae cultures were isolated and a rapid dark reduction of Hg2+ followed by a decrease of Hg0 was observed. The reduction of Hg2+ and re-oxidation of Hg0 were demonstrated in aerobic bacteria Alteromonas spp. using double isotope tracing (199Hg2+ and 201Hg0). These findings highlight the importance of algae-associated aerobic bacteria in Hg transformation in oxic marine water.
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Affiliation(s)
- Xiaoyan Zhang
- Laboratory of Environmental Nanotechnology and Health Effect, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yingying Guo
- Laboratory of Environmental Nanotechnology and Health Effect, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Guangliang Liu
- Department of Chemistry and Biochemistry, Florida International University, Miami, Florida 33199, United States
| | - Yanwei Liu
- Laboratory of Environmental Nanotechnology and Health Effect, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Maoyong Song
- Laboratory of Environmental Nanotechnology and Health Effect, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Jianbo Shi
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Ligang Hu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Yanbin Li
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education and College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
| | - Yongguang Yin
- Laboratory of Environmental Nanotechnology and Health Effect, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- School of Environment, Hangzhou Institute for Advanced Study, UCAS, Chinese Academy of Sciences, Hangzhou 310024, China
| | - Yong Cai
- Laboratory of Environmental Nanotechnology and Health Effect, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Department of Chemistry and Biochemistry, Florida International University, Miami, Florida 33199, United States
| | - Guibin Jiang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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Sea Turtles in the Cancer Risk Landscape: A Global Meta-Analysis of Fibropapillomatosis Prevalence and Associated Risk Factors. Pathogens 2021; 10:pathogens10101295. [PMID: 34684244 PMCID: PMC8540842 DOI: 10.3390/pathogens10101295] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 09/29/2021] [Accepted: 10/04/2021] [Indexed: 12/17/2022] Open
Abstract
Several cancer risk factors (exposure to ultraviolet-B, pollution, toxins and pathogens) have been identified for wildlife, to form a “cancer risk landscape.” However, information remains limited on how the spatiotemporal variability of these factors impacts the prevalence of cancer in wildlife. Here, we evaluated the cancer risk landscape at 49 foraging sites of the globally distributed green turtle (Chelonia mydas), a species affected by fibropapillomatosis, by integrating data from a global meta-analysis of 31 publications (1994–2019). Evaluated risk factors included ultraviolet light exposure, eutrophication, toxic phytoplanktonic blooms, sea surface temperature, and the presence of mechanical vectors (parasites and symbiotic species). Prevalence was highest in areas where nutrient concentrations facilitated the emergence of toxic phytoplankton blooms. In contrast, ultraviolet light exposure and the presence of parasitic and/or symbiotic species did not appear to impact disease prevalence. Our results indicate that, to counter outbreaks of fibropapillomatosis, management actions that reduce eutrophication in foraging areas should be implemented.
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31
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Lee YH, Lee MC, Han J, Park JC, Kim MS, Kim DH, Byeon E, Kim S, Yim JH, Lee JS. iTRAQ-based proteomic profiling, pathway analyses, and apoptotic mechanism in the Antarctic copepod Tigriopus kingsejongensis in response to ultraviolet B radiation. Comp Biochem Physiol C Toxicol Pharmacol 2021; 248:109120. [PMID: 34182096 DOI: 10.1016/j.cbpc.2021.109120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 06/21/2021] [Accepted: 06/22/2021] [Indexed: 11/29/2022]
Abstract
iTRAQ proteomic profiling was conducted to examine the proteomic responses of the Antarctic copepod Tigriopus kingsejongensis under ultraviolet B (UVB) exposure. Of the 5507 proteins identified, 3479 proteins were annotated and classified into 25 groups using clusters of orthologous genes analysis. After exposing the T. kingsejongensis to 12 kJ/m2 UVB radiation, 77 biological processes were modulated over different time periods (0, 6, 12, 24, and 48 h) compared with the control. A Kyoto Encyclopedia of Genes and Genomes pathway enrichment analysis showed that UVB exposure in T. kingsejongensis downregulated ribosome and glyoxylate and dicarboxylate metabolism at all time points. Furthermore, antioxidant and chaperone proteins were highly downregulated in response to UVB exposure, causing protein damage and activating apoptotic processes in the 48 h UVB exposure group. These proteomic changes show the mechanisms that underlie the detrimental effects of UVB on the cellular defense systems of the Antarctic copepod T. kingsejongensis.
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Affiliation(s)
- Young Hwan Lee
- Department of Biological Sciences, College of Science, Sungkyunkwan University, Suwon 16419, South Korea
| | - Min-Chul Lee
- Department of Biological Sciences, College of Science, Sungkyunkwan University, Suwon 16419, South Korea
| | - Jeonghoon Han
- Department of Biological Sciences, College of Science, Sungkyunkwan University, Suwon 16419, South Korea
| | - Jun Chul Park
- Department of Biological Sciences, College of Science, Sungkyunkwan University, Suwon 16419, South Korea
| | - Min-Sub Kim
- Department of Biological Sciences, College of Science, Sungkyunkwan University, Suwon 16419, South Korea
| | - Duck-Hyun Kim
- Department of Biological Sciences, College of Science, Sungkyunkwan University, Suwon 16419, South Korea
| | - Eunjin Byeon
- Department of Biological Sciences, College of Science, Sungkyunkwan University, Suwon 16419, South Korea
| | - Sanghee Kim
- Division of Polar Life Science, Korea Polar Research Institute, Incheon 21990, South Korea
| | - Joung Han Yim
- Division of Polar Life Science, Korea Polar Research Institute, Incheon 21990, South Korea
| | - Jae-Seong Lee
- Department of Biological Sciences, College of Science, Sungkyunkwan University, Suwon 16419, South Korea.
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32
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Rizzo M, Corbau C, Lane B, Malkin SY, Bezzi V, Vaccaro C, Nardin W. Examining the dependence of macroplastic fragmentation on coastal processes (Chesapeake Bay, Maryland). MARINE POLLUTION BULLETIN 2021; 169:112510. [PMID: 34062324 DOI: 10.1016/j.marpolbul.2021.112510] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 05/10/2021] [Accepted: 05/12/2021] [Indexed: 06/12/2023]
Abstract
Plastic debris in the coastal environment is subject to complex and poorly characterized weathering processes. To better understand how key environmental factors affect plastic degradation in a coastal zone, we conducted an in situ experiment. We deployed strips of high density polyethylene (HDPE) and polystyrene (PS) in paired coastal areas of contrasting conditions (hydrodynamic activity: erosional or depositional; water depths: subtidal or intertidal). Strips were collected after environmental exposures at 4, 8, and 43 weeks and analyzed for change in mass, algal biofilm growth, and imaged by petrographic and electron microscopy (SEM-EDS). Significant surface erosion was evident on both polymers, and was more rapid and more extensive with PS. Degradation of PS was responsive to intensity of hydrodynamic activity, and was greater at intertidal depths, highlighting the critical role played by photo-oxidation in the coastal zone, and suggesting that algal biofilms may slow degradation by playing a photo-protective role.
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Affiliation(s)
- Marzia Rizzo
- Horn Point Laboratory, University of Maryland Center for Environmental Science, Cambridge, MD, USA; Department of Physics and Earth Sciences, University of Ferrara, Ferrara, Italy
| | - Corinne Corbau
- Horn Point Laboratory, University of Maryland Center for Environmental Science, Cambridge, MD, USA; Department of Physics and Earth Sciences, University of Ferrara, Ferrara, Italy.
| | - Benjamin Lane
- Horn Point Laboratory, University of Maryland Center for Environmental Science, Cambridge, MD, USA
| | - Sairah Y Malkin
- Horn Point Laboratory, University of Maryland Center for Environmental Science, Cambridge, MD, USA
| | - Virginia Bezzi
- Department of Physics and Earth Sciences, University of Ferrara, Ferrara, Italy
| | - Carmela Vaccaro
- Department of Physics and Earth Sciences, University of Ferrara, Ferrara, Italy
| | - William Nardin
- Horn Point Laboratory, University of Maryland Center for Environmental Science, Cambridge, MD, USA
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Gaylor MO, Miro P, Vlaisavljevich B, Kondage AAS, Barge LM, Omran A, Videau P, Swenson VA, Leinen LJ, Fitch NW, Cole KL, Stone C, Drummond SM, Rageth K, Dewitt LR, González Henao S, Karanauskus V. Plausible Emergence and Self Assembly of a Primitive Phospholipid from Reduced Phosphorus on the Primordial Earth. ORIGINS LIFE EVOL B 2021; 51:185-213. [PMID: 34279769 DOI: 10.1007/s11084-021-09613-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Accepted: 06/19/2021] [Indexed: 11/28/2022]
Abstract
How life arose on the primitive Earth is one of the biggest questions in science. Biomolecular emergence scenarios have proliferated in the literature but accounting for the ubiquity of oxidized (+ 5) phosphate (PO43-) in extant biochemistries has been challenging due to the dearth of phosphate and molecular oxygen on the primordial Earth. A compelling body of work suggests that exogenous schreibersite ((Fe,Ni)3P) was delivered to Earth via meteorite impacts during the Heavy Bombardment (ca. 4.1-3.8 Gya) and there converted to reduced P oxyanions (e.g., phosphite (HPO32-) and hypophosphite (H2PO2-)) and phosphonates. Inspired by this idea, we review the relevant literature to deduce a plausible reduced phospholipid analog of modern phosphatidylcholines that could have emerged in a primordial hydrothermal setting. A shallow alkaline lacustrine basin underlain by active hydrothermal fissures and meteoritic schreibersite-, clay-, and metal-enriched sediments is envisioned. The water column is laden with known and putative primordial hydrothermal reagents. Small system dimensions and thermal- and UV-driven evaporation further concentrate chemical precursors. We hypothesize that a reduced phospholipid arises from Fischer-Tropsch-type (FTT) production of a C8 alkanoic acid, which condenses with an organophosphinate (derived from schreibersite corrosion to hypophosphite with subsequent methylation/oxidation), to yield a reduced protophospholipid. This then condenses with an α-amino nitrile (derived from Strecker-type reactions) to form the polar head. Preliminary modeling results indicate that reduced phospholipids do not aggregate rapidly; however, single layer micelles are stable up to aggregates with approximately 100 molecules.
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Affiliation(s)
- Michael O Gaylor
- Department of Chemistry, Dakota State University, Madison, SD, 57042, USA.
| | - Pere Miro
- Department of Chemistry, University of South Dakota, Vermillion, SD, 57069, USA
| | - Bess Vlaisavljevich
- Department of Chemistry, University of South Dakota, Vermillion, SD, 57069, USA
| | | | - Laura M Barge
- NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, 91109, USA
| | - Arthur Omran
- School of Geosciences, University of South Florida, Tampa, FL, 33620, USA.,Department of Chemistry, University of North Florida, Jacksonville, FL, 32224, USA
| | - Patrick Videau
- Department of Biology, Southern Oregon University, Ashland, OR, 97520, USA.,Bayer Crop Science, Chesterfield, MO, 63017, USA
| | - Vaille A Swenson
- Department of Chemistry, Dakota State University, Madison, SD, 57042, USA.,Department of Molecular Medicine, Mayo Clinic, Rochester, MN, 55905, USA
| | - Lucas J Leinen
- Department of Chemistry, Dakota State University, Madison, SD, 57042, USA
| | - Nathaniel W Fitch
- Department of Chemistry, Dakota State University, Madison, SD, 57042, USA
| | - Krista L Cole
- Department of Chemistry, Dakota State University, Madison, SD, 57042, USA
| | - Chris Stone
- Department of Biology, Southern Oregon University, Ashland, OR, 97520, USA
| | - Samuel M Drummond
- Department of Chemistry, Dakota State University, Madison, SD, 57042, USA
| | - Kayli Rageth
- Department of Chemistry, Dakota State University, Madison, SD, 57042, USA
| | - Lillian R Dewitt
- Department of Chemistry, Dakota State University, Madison, SD, 57042, USA
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34
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Yamashita H, Koike K, Shinzato C, Jimbo M, Suzuki G. Can Acropora tenuis larvae attract native Symbiodiniaceae cells by green fluorescence at the initial establishment of symbiosis? PLoS One 2021; 16:e0252514. [PMID: 34061893 PMCID: PMC8168901 DOI: 10.1371/journal.pone.0252514] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Accepted: 05/17/2021] [Indexed: 11/21/2022] Open
Abstract
Most corals acquire symbiodiniacean symbionts from the surrounding environment to initiate symbiosis. The cell densities of Symbiodiniaceae in the environment are usually low, and mechanisms may exist by which new coral generations attract suitable endosymbionts. Phototaxis of suitable symbiodiniacean cells toward green fluorescence in corals has been proposed as one such mechanism. In the present study, we observed the phototaxis action wavelength of various strains of Symbiodiniaceae and the fluorescence spectra of aposymbiotic Acropora tenuis larvae at the time of endosymbiont uptake. The phototaxis patterns varied among the Symbiodiniaceae species and “native” endosymbionts—commonly found in Acropora juveniles present in natural environments; that is, Symbiodinium microadriaticum was attracted to blue light rather than to green light. Another native endosymbiont, Durusdinium trenchii, showed no phototaxis specific to any wavelength. Although the larvae exhibited green and broad orange fluorescence under blue-violet excitation light, the maximum green fluorescence peak did not coincide with that of the phototaxis action spectrum of S. microadriaticum. Rather, around the peak wavelength of larval green fluorescence, this native endosymbiont showed slightly negative phototaxis, suggesting that the green fluorescence of A. tenuis larvae may not play a role in the initial attraction of native endosymbionts. Conversely, broad blue larval fluorescence under UV-A excitation covered the maximum phototaxis action wavelength of S. microadriaticum. We also conducted infection tests using native endosymbionts and aposymbiotic larvae under red LED light that does not excite visible larval fluorescence. Almost all larvae failed to acquire S. microadriaticum cells, whereas D. trenchii cells were acquired by larvae even under red illumination. Thus, attraction mechanisms other than visible fluorescence might exist, at least in the case of D. trenchii. Our results suggest that further investigation and discussion, not limited to green fluorescence, would be required to elucidate the initial attraction mechanisms.
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Affiliation(s)
- Hiroshi Yamashita
- Fisheries Technology Institute, Japan Fisheries Research and Education Agency, Ishigaki, Okinawa, Japan
- * E-mail:
| | - Kazuhiko Koike
- Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
| | - Chuya Shinzato
- Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba, Japan
| | - Mitsuru Jimbo
- School of Marine Biosciences, Kitasato University, Sagamihara, Kanagawa, Japan
| | - Go Suzuki
- Fisheries Technology Institute, Japan Fisheries Research and Education Agency, Ishigaki, Okinawa, Japan
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Blanckaert ACA, de Barros Marangoni LF, Rottier C, Grover R, Ferrier-Pagès C. Low levels of ultra-violet radiation mitigate the deleterious effects of nitrate and thermal stress on coral photosynthesis. MARINE POLLUTION BULLETIN 2021; 167:112257. [PMID: 33756374 DOI: 10.1016/j.marpolbul.2021.112257] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Revised: 03/05/2021] [Accepted: 03/07/2021] [Indexed: 05/20/2023]
Abstract
Reef ecosystems are under increasing pressure from global and local stressors. Rising seawater temperature and high ultraviolet radiation (UVR) levels are the main drivers of the disruption of the coral-dinoflagellate symbiosis (bleaching). Bleaching can also be exacerbated by nitrate contamination in coastal reefs. However, the underlying physiological mechanisms are still poorly understood. Here, we assessed the physiological and oxidative state of the scleractinian coral Pocillopora damicornis, maintained eight weeks in a crossed-factorial design including two temperatures (26 °C or 30 °C), and two nitrate (0.5 and 3 μM-enriched), and UVR (no UVR and 25/1.5 Wm-2 UVA/B) levels. Nitrate enrichment, and high temperature, significantly impaired coral photosynthesis. However, UVR alleviated the nitrate and temperature-induced decrease in photosynthesis, by increasing the coral's antioxidant capacity. The present study contributes to our understanding of the combined effects of abiotic stressors on coral bleaching susceptibility. Such information is urgently needed to refine reef management strategies.
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Affiliation(s)
- Alice C A Blanckaert
- Sorbonne Université, UPMC Université Paris VI, IFD-ED 129, Paris Cedex 05, France; Centre Scientifique de Monaco, Coral Ecophysiology team, 8 Quai Antoine 1er, MC 98000, Monaco.
| | | | - Cécile Rottier
- Centre Scientifique de Monaco, Coral Ecophysiology team, 8 Quai Antoine 1er, MC 98000, Monaco
| | - Renaud Grover
- Centre Scientifique de Monaco, Coral Ecophysiology team, 8 Quai Antoine 1er, MC 98000, Monaco
| | - Christine Ferrier-Pagès
- Centre Scientifique de Monaco, Coral Ecophysiology team, 8 Quai Antoine 1er, MC 98000, Monaco
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Araújo MJ, Quintaneiro C, Soares AMVM, Monteiro MS. Effects of ultraviolet radiation to Solea senegalensis during early development. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 764:142899. [PMID: 33127138 DOI: 10.1016/j.scitotenv.2020.142899] [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: 07/21/2020] [Revised: 09/11/2020] [Accepted: 10/01/2020] [Indexed: 05/20/2023]
Abstract
Ultraviolet radiation (UVR) reaching the Earth surface is increasing and scarce information is available regarding effects of this stressor to early life stages of marine vertebrates. Therefore, this work aims to study the effects of UVR exposure during early development stages of the flatfish Solea senegalensis. Firstly, fish were exposed to UVR (six daily doses between 3.4 ± 0.08 and 8.6 ± 0.14 kJ m-2) at the following moments: gastrula stage (24 h post fertilization, hpf), 1 and 2 days after hatching (dah, 48 and 72 hpf, respectively). In a second bioassay, fish at the beginning of metamorphosis were exposed to UVR (one or two daily doses of 7.2 ± 0.39 or 11.1 ± 0.49 kJ m-2) and then maintained until the end of metamorphosis. Mortality and effects on development, growth and behaviour were evaluated at the end of both bioassays (3 dah and 18 dah, respectively). Biomarkers of neurotransmission (acetylcholinesterase, AChE), oxidative stress (catalase, CAT) and biotransformation (glutathione S-transferase, GST) were also determined at the end of the early larvae bioassay, and metamorphosis progression was evaluated during the second bioassay. UVR exposure caused distinct effects depending on life stage. Altered pigmentation, decreased growth, impaired fish behaviour and AChE and GST inhibition were observed at the earlier larval phase. Whereas, decrease in growth was the main effect observed at the metamorphosis stage. In summary, the exposure of S. senegalensis early stages to environmentally relevant UVR doses led to adverse responses at different levels of biological organization, which might lead to implications in later life stages.
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Affiliation(s)
- Mário J Araújo
- CESAM (Centre for Environmental and Marine Studies) & Department of Biology, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal; CIIMAR (Interdisciplinary Centre of Marine and Environmental Research), University of Porto, Terminal de Cruzeiros do Porto de Leixões, Av. General Norton de Matos s/n, 4450-208 Matosinhos, Portugal.
| | - Carla Quintaneiro
- CESAM (Centre for Environmental and Marine Studies) & Department of Biology, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Amadeu M V M Soares
- CESAM (Centre for Environmental and Marine Studies) & Department of Biology, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Marta S Monteiro
- CESAM (Centre for Environmental and Marine Studies) & Department of Biology, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
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Bonaventura R, Zito F, Russo R, Costa C. A preliminary gene expression analysis on Paracentrotus lividus embryos exposed to UVB, Cadmium and their combination. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2021; 232:105770. [PMID: 33581547 DOI: 10.1016/j.aquatox.2021.105770] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 01/18/2021] [Accepted: 01/27/2021] [Indexed: 06/12/2023]
Abstract
Paracentrotus lividus is a Mediterranean and Eastern Atlantic sea urchin species, very sensitive to chemical and physical environmental changes and widely used in eco-toxicological studies. Here, we applied a high throughput screening approach on P. lividus embryos exposed to UVB radiation (UV), Cadmium Chloride (Cd) and their combination (Cd/UV), to deeply characterize the molecular responses adopted by embryos to cope with these stressors. in vitro eco-toxicological assays were performed by exposing embryos to Cd (10-4 M) soon after fertilization, to UV (200 and 400J/m2) at early stage of development, while in co-exposure experiments, Cd-exposed embryos were irradiated with UV at 200 J/m2. By NanoString nCounter technology, custom-made probes were developed and hybridized on total RNA extracted from exposed embryos at 51h after fertilization. By in silico analyses, we selected and retrieved at the NCBI nucleotide database a panel of P. lividus transcripts encoding for many regulatory and structural proteins that we ranked in categories, i.e., Apoptosis, Biomineralization, Defense, Development, Immunity, Signaling and Transcription Factors. The analysis of 127 transcripts highlighted the dysregulation of many genes, some specifically activated to cope with stress agents, others involved in the complex molecular network of genes that regulate embryo development. We revealed the downregulation of Biomineralization and Development genes and the upregulation of Defensive genes in Cd and Cd/UV embryos. Our approach, using sea urchin embryo as an in vivomodel, contributes to advance our knowledge about cellular responses to UV, Cd and their combination.
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Affiliation(s)
- Rosa Bonaventura
- Consiglio Nazionale delle Ricerche, Istituto per la Ricerca e l'Innovazione Biomedica, Via Ugo La Malfa 153, Palermo, 90146, Italy.
| | - Francesca Zito
- Consiglio Nazionale delle Ricerche, Istituto per la Ricerca e l'Innovazione Biomedica, Via Ugo La Malfa 153, Palermo, 90146, Italy
| | - Roberta Russo
- Consiglio Nazionale delle Ricerche, Istituto per la Ricerca e l'Innovazione Biomedica, Via Ugo La Malfa 153, Palermo, 90146, Italy.
| | - Caterina Costa
- Consiglio Nazionale delle Ricerche, Istituto per la Ricerca e l'Innovazione Biomedica, Via Ugo La Malfa 153, Palermo, 90146, Italy
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Dur G, Won EJ, Han J, Lee JS, Souissi S. An individual-based model for evaluating post-exposure effects of UV-B radiation on zooplankton reproduction. Ecol Modell 2021. [DOI: 10.1016/j.ecolmodel.2020.109379] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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39
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How macroalgae can deal with radiation variability and photoacclimation capacity: The example of Gracilaria tenuistipitata (Rhodophyta) in laboratory. ALGAL RES 2020. [DOI: 10.1016/j.algal.2020.102007] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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40
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Qarri A, Rosner A, Rabinowitz C, Rinkevich B. UV-B radiation bearings on ephemeral soma in the shallow water tunicate Botryllus schlosseri. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 196:110489. [PMID: 32278137 DOI: 10.1016/j.ecoenv.2020.110489] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 02/05/2020] [Accepted: 03/15/2020] [Indexed: 06/11/2023]
Abstract
Sedentary shallow water marine organisms acquire numerous protective mechanisms to mitigate the detrimental effects of UV radiation (UV-R). Here we investigated morphological and gene expression outcomes in colonies of the cosmopolitan ascidian Botryllus schlosseri, up to 15-days post UV-B irradiation. Astogeny in Botryllus is characterized by weekly repeating sets of asexual budding, coinciding with apoptotic elimination of functional zooids (blastogenesis). Ten UV-B doses were administered to three clusters: sublethal, enhanced-mortality, lethal (LD50 = 6.048 kJ/m2) which differed in mortality rates, yet reflected similar distorted morphotypes, and arrested blastogenesis, all intensified in the enhanced-mortality/lethal clusters. Even the sub-lethal doses inflicted expression modifications in 8 stress proteins (HSP 90/70 families and NIMA) as well as morphological blastogenesis. The morphological/gene-expression impacts in surviving colonies lasted for 15 days post irradiation (two blastogenic-cycles), where all damaged and arrested zooids/buds were absorbed, after which the colonies returned to their normal blastogenic-cycles and gene expression profiles, and initiated new buds. The above reflects a novel colonial maintenance strategy associated with the disposable-soma tenet, where the ephemeral soma in Botryllus is eliminated without engaging with the costs of repair, whereas other colonial components, primarily the pool of totipotent stem cells, are sustained under yet unknown colonial-level regulatory cues.
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Affiliation(s)
- Andy Qarri
- Israel Oceanographic & Limnological Research, National Institute of Oceanography, POB 8030, Tel Shikmona, 31080, Haifa, Israel; The Department of Maritime Civilizations, Leon H. Charney School of Marine Sciences, University of Haifa, Mount Carmel, Haifa, 3498838, Israel.
| | - Amalia Rosner
- Israel Oceanographic & Limnological Research, National Institute of Oceanography, POB 8030, Tel Shikmona, 31080, Haifa, Israel
| | - Claudette Rabinowitz
- Israel Oceanographic & Limnological Research, National Institute of Oceanography, POB 8030, Tel Shikmona, 31080, Haifa, Israel
| | - Baruch Rinkevich
- Israel Oceanographic & Limnological Research, National Institute of Oceanography, POB 8030, Tel Shikmona, 31080, Haifa, Israel
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41
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Krause S, Molari M, Gorb EV, Gorb SN, Kossel E, Haeckel M. Persistence of plastic debris and its colonization by bacterial communities after two decades on the abyssal seafloor. Sci Rep 2020; 10:9484. [PMID: 32528001 PMCID: PMC7289819 DOI: 10.1038/s41598-020-66361-7] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Accepted: 02/25/2020] [Indexed: 12/14/2022] Open
Abstract
The fate of plastic debris entering the oceans is largely unconstrained. Currently, intensified research is devoted to the abiotic and microbial degradation of plastic floating near the ocean surface for an extended period of time. In contrast, the impacts of environmental conditions in the deep sea on polymer properties and rigidity are virtually unknown. Here, we present unique results of plastic items identified to have been introduced into deep-sea sediments at a water depth of 4150 m in the eastern equatorial Pacific Ocean more than two decades ago. The results, including optical, spectroscopic, physical and microbial analyses, clearly demonstrate that the bulk polymer materials show no apparent sign of physical or chemical degradation. Solely the polymer surface layers showed reduced hydrophobicity, presumably caused by microbial colonization. The bacterial community present on the plastic items differed significantly (p < 0.1%) from those of the adjacent natural environment by a dominant presence of groups requiring steep redox gradients (Mesorhizobium, Sulfurimonas) and a remarkable decrease in diversity. The establishment of chemical gradients across the polymer surfaces presumably caused these conditions. Our findings suggest that plastic is stable over extended times under deep-sea conditions and that prolonged deposition of polymer items at the seafloor may induce local oxygen depletion at the sediment-water interface.
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Affiliation(s)
- S Krause
- GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany.
| | - M Molari
- HGF-MPG Joint Research Group on Deep Sea Ecology and Technology, Max Planck Institute for Marine Microbiology, Bremen, Germany
| | - E V Gorb
- Zoological Institute, Christian-Albrechts-University, Kiel, Germany
| | - S N Gorb
- Zoological Institute, Christian-Albrechts-University, Kiel, Germany
| | - E Kossel
- GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany
| | - M Haeckel
- GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany
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42
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Nordborg FM, Jones RJ, Oelgemöller M, Negri AP. The effects of ultraviolet radiation and climate on oil toxicity to coral reef organisms - A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 720:137486. [PMID: 32325569 DOI: 10.1016/j.scitotenv.2020.137486] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 02/20/2020] [Accepted: 02/20/2020] [Indexed: 05/20/2023]
Abstract
Oil pollution remains a significant local threat to shallow tropical coral reef environments, but the environmental conditions typical of coral reefs are rarely considered in oil toxicity testing and risk assessments. Here we review the effects of three environmental co-factors on petroleum oil toxicity towards coral reef organisms, and show that the impacts of oil pollution on coral reef taxa can be exacerbated by environmental conditions commonly encountered in tropical reef environments. Shallow reefs are routinely exposed to high levels of ultraviolet radiation (UVR), which can substantially increase the toxicity of some oil components through phototoxicity. Exposure to UVR represents the most likely and harmful environmental co-factor reviewed here, leading to an average toxicity increase of 7.2-fold across all tests reviewed. The clear relevance of UVR co-exposure and its strong influence on tropical reef oil toxicity highlights the need to account for UVR as a standard practice in future oil toxicity studies. Indeed, quantifying the influence of UVR on toxic thresholds of oil to coral reef species is essential to develop credible oil spill risk models required for oil extraction developments, shipping management and spill responses in the tropics. The few studies available indicate that co-exposure to elevated temperature and low pH, both within the range of current daily and seasonal fluctuations and/or projected under continued climate change, can increase oil toxicity on average by 3.0- and 1.3-fold, respectively. While all three of the reviewed environmental co-factors have the potential to substantially increase the impacts of oil pollution in shallow reef environments, their simultaneous effects have not been investigated. Assessments of the combined effects of oil pollution, UVR, temperature and low pH will become increasingly important to identify realistic hazard thresholds suitable for future risk assessments over the coming century.
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Affiliation(s)
- F Mikaela Nordborg
- James Cook University, College of Science & Engineering, Townsville, Queensland 4810, Australia; AIMS@JCU, Division of Research & Innovation, James Cook University and Australian Institute of Marine Science, Townsville 4810, Queensland, Australia; Australian Institute of Marine Science, Townsville 4810, Queensland, Australia.
| | - Ross J Jones
- Australian Institute of Marine Science, Crawley 6009, Western Australia, Australia
| | - Michael Oelgemöller
- James Cook University, College of Science & Engineering, Townsville, Queensland 4810, Australia
| | - Andrew P Negri
- AIMS@JCU, Division of Research & Innovation, James Cook University and Australian Institute of Marine Science, Townsville 4810, Queensland, Australia; Australian Institute of Marine Science, Townsville 4810, Queensland, Australia
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Wu Y, Zhang M, Li Z, Xu J, Beardall J. Differential Responses of Growth and Photochemical Performance of Marine Diatoms to Ocean Warming and High Light Irradiance. Photochem Photobiol 2020; 96:1074-1082. [DOI: 10.1111/php.13268] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Accepted: 03/20/2020] [Indexed: 01/24/2023]
Affiliation(s)
- Yaping Wu
- College of Marine Life and Fisheries Jiangsu Ocean University Lianyungang China
- Co‐Innovation Center of Jiangsu Marine Bio‐industry Technology Jiangsu Ocean University Lianyungang China
| | - Mengjuan Zhang
- College of Marine Life and Fisheries Jiangsu Ocean University Lianyungang China
| | - Zhenzhen Li
- The Swire Institute of Marine Science and School of Biological Sciences The University of Hong Kong Hong Kong China
| | - Juntian Xu
- College of Marine Life and Fisheries Jiangsu Ocean University Lianyungang China
- Co‐Innovation Center of Jiangsu Marine Bio‐industry Technology Jiangsu Ocean University Lianyungang China
| | - John Beardall
- School of Biological Sciences Monash University Clayton Vic. Australia
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Lambrecht SJ, Steglich C, Hess WR. A minimum set of regulators to thrive in the ocean. FEMS Microbiol Rev 2020; 44:232-252. [DOI: 10.1093/femsre/fuaa005] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Accepted: 02/19/2020] [Indexed: 12/25/2022] Open
Abstract
ABSTRACT
Marine cyanobacteria of the genus Prochlorococcus thrive in high cell numbers throughout the euphotic zones of the world's subtropical and tropical oligotrophic oceans, making them some of the most ecologically relevant photosynthetic microorganisms on Earth. The ecological success of these free-living phototrophs suggests that they are equipped with a regulatory system competent to address many different stress situations. However, Prochlorococcus genomes are compact and streamlined, with the majority encoding only five different sigma factors, five to six two-component systems and eight types of other transcriptional regulators. Here, we summarize the existing information about the functions of these protein regulators, about transcriptomic responses to defined stress conditions, and discuss the current knowledge about riboswitches, RNA-based regulation and the roles of certain metabolites as co-regulators. We focus on the best-studied isolate, Prochlorococcus MED4, but extend to other strains and ecotypes when appropriate, and we include some information gained from metagenomic and metatranscriptomic analyses.
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Affiliation(s)
- S Joke Lambrecht
- Genetics and Experimental Bioinformatics, Institute of Biology III, Faculty of Biology, University of Freiburg, Schänzlestr. 1, D-79104 Freiburg, Germany
| | - Claudia Steglich
- Genetics and Experimental Bioinformatics, Institute of Biology III, Faculty of Biology, University of Freiburg, Schänzlestr. 1, D-79104 Freiburg, Germany
| | - Wolfgang R Hess
- Genetics and Experimental Bioinformatics, Institute of Biology III, Faculty of Biology, University of Freiburg, Schänzlestr. 1, D-79104 Freiburg, Germany
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45
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Tribelli PM, Pezzoni M, Brito MG, Montesinos NV, Costa CS, López NI. Response to lethal UVA radiation in the Antarctic bacterium Pseudomonas extremaustralis: polyhydroxybutyrate and cold adaptation as protective factors. Extremophiles 2019; 24:265-275. [DOI: 10.1007/s00792-019-01152-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Accepted: 12/03/2019] [Indexed: 12/14/2022]
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Bashevkin SM, Christy JH, Morgan SG. Adaptive specialization and constraint in morphological defences of planktonic larvae. Funct Ecol 2019. [DOI: 10.1111/1365-2435.13464] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Samuel M. Bashevkin
- Bodega Marine Laboratory and Department of Environmental Science and Policy University of California, Davis Bodega Bay CA USA
| | - John H. Christy
- Smithsonian Tropical Research Institute Panamá República de Panamá
| | - Steven G. Morgan
- Bodega Marine Laboratory and Department of Environmental Science and Policy University of California, Davis Bodega Bay CA USA
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Wang H, Zhang M, He X, Du T, Wang Y, Li Y, Hao T. Facile prepared ball-like TiO 2 at GO composites for oxytetracycline removal under solar and visible lights. WATER RESEARCH 2019; 160:197-205. [PMID: 31151001 DOI: 10.1016/j.watres.2019.05.073] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 05/21/2019] [Accepted: 05/22/2019] [Indexed: 05/27/2023]
Abstract
With the widespread use of oxytetracycline (OTC), residual OTCs have been detected in natural surface waters, as well as in water and wastewater treatment systems. Semiconductor photocatalysis has been proven to be a green and high-performing method for the removal of organic contaminants. However, most photocatalysts are only effective when irradiated by UV light. This study explores the efficiency of a new semiconductor photocatalysis method for OTC removal under solar and visible light. To expand the spectral range from the UV to the visible region, a facile prepared ball-like TiO2 at graphene oxide (TiO2@GO) composite, a TiO2-associated catalyst, was synthesized. Chemical characterization indicated that the TiO2@GO has the features of both TiO2 and GO, with the regular TiO2 fiber balls cladded by GO nanosheets. The photocatalytic activity of TiO2@GO composites under solar and visible light was evaluated in terms of OTC degradation. Values of 100% and 90% OTC removal efficiencies were achieved with TiO2@GO at 6 mg/L under solar and visible light irradiation, respectively. The band structure of TiO2@GO expanded the spectral range to full light wavelengths, facilitating formation of a light-induced electron hole (h+), which was identified in this study as the major cause of OTC degradation. The pH and TSS levels (>100 mg/L) were found to have high and low impacts, respectively, on the removal efficiency of OTC, while natural organic matter (NOM) was found to have an insignificant impact. Furthermore, the degradation of OTC with catalysis by TiO2@GO was verified using two real water samples, and averages of 90% and 75% OTC removal efficiencies were achieved under solar and visible light respectively. The results indicate that the synthesized TiO2@GO composites can provide an effective way of removing toxic organic compounds, including OTC, from the water system.
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Affiliation(s)
- Huihui Wang
- College of Environmental Science and Engineering/Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tong Yan Road 38, Tianjin, 300350, China
| | - Min Zhang
- College of Environmental Science and Engineering/Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tong Yan Road 38, Tianjin, 300350, China
| | - Xizhen He
- College of Environmental Science and Engineering/Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tong Yan Road 38, Tianjin, 300350, China
| | - Tingting Du
- College of Environmental Science and Engineering/Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tong Yan Road 38, Tianjin, 300350, China
| | - Yingying Wang
- College of Environmental Science and Engineering/Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tong Yan Road 38, Tianjin, 300350, China
| | - Yao Li
- College of Environmental Science and Engineering/Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tong Yan Road 38, Tianjin, 300350, China.
| | - Tianwei Hao
- Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Macau, China.
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Ding J, Zhang L, Sun J, Shi D, Chi X, Yang M, Chang Y, Zhao C. Transgenerational effects of UV-B radiation on egg size, fertilization, hatching and larval size of sea urchins Strongylocentrotus intermedius. PeerJ 2019; 7:e7598. [PMID: 31523520 PMCID: PMC6714959 DOI: 10.7717/peerj.7598] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 07/31/2019] [Indexed: 01/14/2023] Open
Abstract
Transgenerational effects are important for phenotypic plasticity and adaptation of marine invertebrates in the changing ocean. Ultraviolet-B (UV-B) radiation is an increasing threat to marine invertebrates. For the first time, we reported positive and negative transgenerational effects of UV-B radiation on egg size, fertilization, hatchability and larval size of a marine invertebrate. Strongylocentrotus intermedius exposed to UV-B radiation showed positive transgenerational effects and adaptation on egg size, hatching rate and post-oral arm length of larvae. Negative transgenerational effects were found in body length, stomach length and stomach width of larvae whose parents were exposed to UV-B radiation. Sires probably play important roles in transgenerational effects of UV-B. The present study provides valuable information into transgenerational effects of UV-B radiation on fitness related traits of sea urchins (at least Strongylocentrotus intermedius).
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Affiliation(s)
- Jingyun Ding
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture and Rural Affairs, Dalian Ocean University, Dalian, China
| | - Lingling Zhang
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture and Rural Affairs, Dalian Ocean University, Dalian, China
| | - Jiangnan Sun
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture and Rural Affairs, Dalian Ocean University, Dalian, China
| | - Dongtao Shi
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture and Rural Affairs, Dalian Ocean University, Dalian, China
| | - Xiaomei Chi
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture and Rural Affairs, Dalian Ocean University, Dalian, China
| | - Mingfang Yang
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture and Rural Affairs, Dalian Ocean University, Dalian, China
| | - Yaqing Chang
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture and Rural Affairs, Dalian Ocean University, Dalian, China
| | - Chong Zhao
- Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture and Rural Affairs, Dalian Ocean University, Dalian, China
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Overmans S, Agustí S. Latitudinal Gradient of UV Attenuation Along the Highly Transparent Red Sea Basin. Photochem Photobiol 2019; 95:1267-1279. [PMID: 31066904 PMCID: PMC6852308 DOI: 10.1111/php.13112] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2019] [Accepted: 04/21/2019] [Indexed: 01/01/2023]
Abstract
The tropical and subtropical oceans experience intense incident ultraviolet radiation (280–400 nm) while their water columns are thought to be highly transparent. This combination represents a high potential for harmful effects on organisms, yet only few reports on the UV penetration properties of oligotrophic tropical waters exist. Here, we present the pattern of UV attenuation over a wide latitudinal range of the oligotrophic Red Sea. We recorded spectroradiometer profiles of PAR and UV, together with chlorophyll‐a (Chl‐a) and light absorption by chromophoric dissolved organic matter (CDOM) to determine the contribution of phytoplankton and CDOM toward UV attenuation. Transparency to UV exhibited a distinct latitudinal gradient, with the lowest and highest diffuse attenuation coefficients at 313 nm (Kd (313)) of 0.130 m−1 and 0.357 m−1 observed at the northern coast off Duba, and in the south close to the Farasan islands, respectively. Phytoplankton and CDOM both modulated UV attenuation, but CDOM was found to be the key driver despite the lack of riverine inputs. We confirm that ultraviolet radiation can reach deeper into the Red Sea than previously described, which means its potential to act as a stressor and selective driver for Red Sea organisms may have been underestimated to date.
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Affiliation(s)
- Sebastian Overmans
- King Abdullah University of Science and Technology (KAUST), Red Sea Research Center (RSRC), Thuwal, 23955-6900, Saudi Arabia
| | - Susana Agustí
- King Abdullah University of Science and Technology (KAUST), Red Sea Research Center (RSRC), Thuwal, 23955-6900, Saudi Arabia
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50
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Lawrence KP, Long PF, Young AR. Mycosporine-Like Amino Acids for Skin Photoprotection. Curr Med Chem 2019; 25:5512-5527. [PMID: 28554325 PMCID: PMC6446518 DOI: 10.2174/0929867324666170529124237] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 05/15/2017] [Accepted: 05/15/2017] [Indexed: 11/22/2022]
Abstract
BACKGROUND Excessive human exposure to solar ultraviolet radiation (UVR) continues to be a major public health concern, with skin cancer rates increasing year on year. The major protective measure is the use of synthetic UVR filters formulated into sunscreens, but there is a growing concern that some of these chemicals cause damage to delicate marine ecosystems. One alternative is the use of biocompatible mycosporine-like amino acids (MAA), which occur naturally in a wide range of marine species. Their role within nature is mainly thought to be photoprotective. However, their potential for human photoprotection is largely understudied. OBJECTIVE To review the role of MAA in nature and assess their potential as natural sunscreens for human skin photoprotection. METHOD A literature review of all relevant papers was conducted. CONCLUSION MAA are natural photostable compounds that are thought to offer photoprotection to marine species. Initially thought of as protective based on their absorption properties in the solar UVR spectrum, it is clear that MAA are multifunctional photoprotective compounds acting as chemical and biological anti-oxidants. This suggests that MAA may offer a novel eco-friendly approach to human skin photoprotection. Most studies have been carried out in vitro and current data strongly suggest that MAA have potential for development as natural biocompatible sunscreens that protect against a diverse range of solar UVR induced adverse effects on human health.
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Affiliation(s)
- Karl P Lawrence
- St. John's Institute of Dermatology, Faculty of Life Sciences and Medicine, King's College London, London, United Kingdom
| | - Paul F Long
- Institute of Pharmaceutical Science, Faculty of Life Sciences and Medicine, King's College London, London, United Kingdom
| | - Antony R Young
- St. John's Institute of Dermatology, Faculty of Life Sciences and Medicine, King's College London, London, United Kingdom
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