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Pan J, Li X, Zhu S. High-resolution estimation of near-surface ozone concentration and population exposure risk in China. ENVIRONMENTAL MONITORING AND ASSESSMENT 2024; 196:249. [PMID: 38340249 DOI: 10.1007/s10661-024-12416-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Accepted: 01/29/2024] [Indexed: 02/12/2024]
Abstract
Considering the spatial and temporal effects of atmospheric pollutants, using the geographically and temporally weighted regression and geo-intelligent random forest (GTWR-GeoiRF) model and Sentinel-5P satellite remote sensing data, combined with meteorological, emission inventory, site observation, population, elevation, and other data, the high-precision ozone concentration and its spatiotemporal distribution near the ground in China from March 2020 to February 2021 were estimated. On this basis, the pollution status, near-surface ozone concentration, and population exposure risk were analyzed. The findings demonstrate that the estimation outcomes of the GTWR-GeoiRF model have high precision, and the precision of the estimation results is higher compared with that of the non-hybrid model. The downscaling method enhances estimation results to some extent while addressing the issue of limited spatial resolution in some data. China's near-surface ozone concentration distribution in space shows obvious regional and seasonal characteristics. The eastern region has the highest ozone concentrations and the lowest in the northeastern region, and the wintertime low is higher than the summertime high. There are significant differences in ozone population exposure risks, with the highest exposure risks being found in China's eastern region, with population exposure risks mostly ranging from 0.8 to 5.
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Affiliation(s)
- Jinghu Pan
- College of Geography and Environmental Science, Northwest Normal University, No. 967 Anning East Road, Lanzhou, Gansu Province, People's Republic of China.
| | - Xuexia Li
- College of Geography and Environmental Science, Northwest Normal University, No. 967 Anning East Road, Lanzhou, Gansu Province, People's Republic of China
| | - Shixin Zhu
- College of Geography and Environmental Science, Northwest Normal University, No. 967 Anning East Road, Lanzhou, Gansu Province, People's Republic of China
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Cleary DFR, de Voogd NJ, Stuij TM, Swierts T, Oliveira V, Polónia ARM, Louvado A, Gomes NCM, Coelho FJRC. A Study of Sponge Symbionts from Different Light Habitats. MICROBIAL ECOLOGY 2023; 86:2819-2837. [PMID: 37597041 PMCID: PMC10640470 DOI: 10.1007/s00248-023-02267-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Accepted: 07/07/2023] [Indexed: 08/21/2023]
Abstract
The amount of available light plays a key role in the growth and development of microbial communities. In the present study, we tested to what extent sponge-associated prokaryotic communities differed between specimens of the sponge species Cinachyrella kuekenthali and Xestospongia muta collected in dimly lit (caves and at greater depths) versus illuminated (shallow water) habitats. In addition to this, we also collected samples of water, sediment, and another species of Cinachyrella, C. alloclada. Overall, the biotope (sponge host species, sediment, and seawater) proved the major driver of variation in prokaryotic community composition. The light habitat, however, also proved a predictor of compositional variation in prokaryotic communities of both C. kuekenthali and X. muta. We used an exploratory technique based on machine learning to identify features (classes, orders, and OTUs), which distinguished X. muta specimens sampled in dimly lit versus illuminated habitat. We found that the classes Alphaproteobacteria and Rhodothermia and orders Puniceispirillales, Rhodospirillales, Rhodobacterales, and Thalassobaculales were associated with specimens from illuminated, i.e., shallow water habitat, while the classes Dehalococcoidia, Spirochaetia, Entotheonellia, Nitrospiria, Schekmanbacteria, and Poribacteria, and orders Sneathiellales and Actinomarinales were associated with specimens sampled from dimly lit habitat. There was, however, considerable variation within the different light habitats highlighting the importance of other factors in structuring sponge-associated bacterial communities.
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Affiliation(s)
- D F R Cleary
- CESAM & Department of Biology, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal.
| | - N J de Voogd
- Naturalis Biodiversity Center, Leiden, The Netherlands.
- Institute of Environmental Sciences (CML), Leiden University, Leiden, The Netherlands.
| | - T M Stuij
- CESAM & Department of Biology, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal
| | - T Swierts
- Naturalis Biodiversity Center, Leiden, The Netherlands
| | - V Oliveira
- CESAM & Department of Biology, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal
| | - A R M Polónia
- CESAM & Department of Biology, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal
| | - A Louvado
- CESAM & Department of Biology, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal
| | - N C M Gomes
- CESAM & Department of Biology, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal
| | - F J R C Coelho
- CESAM & Department of Biology, University of Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal
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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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Teixeira TR, Rangel KC, Tavares RSN, Kawakami CM, Dos Santos GS, Maria-Engler SS, Colepicolo P, Gaspar LR, Debonsi HM. In Vitro Evaluation of the Photoprotective Potential of Quinolinic Alkaloids Isolated from the Antarctic Marine Fungus Penicillium echinulatum for Topical Use. MARINE BIOTECHNOLOGY (NEW YORK, N.Y.) 2021; 23:357-372. [PMID: 33811268 DOI: 10.1007/s10126-021-10030-x] [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: 01/13/2021] [Accepted: 03/12/2021] [Indexed: 06/12/2023]
Abstract
Marine-derived fungi proved to be a rich source of biologically active compounds. The genus Penicillium has been extensively studied regarding their secondary metabolites and biological applications. However, the photoprotective effects of these metabolites remain underexplored. Herein, the photoprotective potential of Penicillium echinulatum, an Antarctic alga-associated fungus, was assessed by UV absorption, photostability study, and protection from UVA-induced ROS generation assay on human immortalized keratinocytes (HaCaT) and reconstructed human skin (RHS). The photosafety was evaluated by the photoreactivity (OECD TG 495) and phototoxicity assays, performed by 3T3 neutral red uptake (3T3 NRU PT, OECD TG 432) and by the RHS model. Through a bio-guided purification approach, four known alkaloids, (-)-cyclopenin (1), dehydrocyclopeptine (2), viridicatin (3), and viridicatol (4), were isolated. Compounds 3 and 4 presented absorption in UVB and UVA-II regions and were considered photostable after UVA irradiation. Despite compounds 3 and 4 showed phototoxic potential in 3T3 NRU PT, no phototoxicity was observed in the RHS model (reduction of cell viability < 30%), which indicates their very low acute photoirritation and high photosafety potential in humans. Viridicatin was considered weakly photoreactive, while viridicatol showed no photoreactivity; both compounds inhibited UVA-induced ROS generation in HaCaT cells, although viridicatol was not able to protect the RHS model against UVA-induced ROS production. Thus, the results highlighted the photoprotective and antioxidant potential of metabolites produced by P. echinulatum which can be considered a new class of molecules for photoprotection, since their photosafety and non-cytotoxicity were predicted using recommended in vitro methods for topical use.
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Affiliation(s)
- Thaiz Rodrigues Teixeira
- Department of Biomolecular Sciences, School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Karen Cristina Rangel
- Department of Pharmaceutical Sciences, School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Renata Spagolla Napoleão Tavares
- Department of Pharmaceutical Sciences, School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Camila Martins Kawakami
- Department of Pharmaceutical Sciences, School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Gustavo Souza Dos Santos
- Department of Biomolecular Sciences, School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Silvya Stuchi Maria-Engler
- Department of Clinical and Toxicological Analysis, School of Pharmaceutical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - Pio Colepicolo
- Department of Biochemistry, Chemistry Institute, University of São Paulo, São Paulo, SP, Brazil
| | - Lorena Rigo Gaspar
- Department of Pharmaceutical Sciences, School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Hosana Maria Debonsi
- Department of Biomolecular Sciences, School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil.
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Glippa O, Engström-Öst J, Kanerva M, Rein A, Vuori K. Oxidative stress and antioxidant defense responses in Acartia copepods in relation to environmental factors. PLoS One 2018; 13:e0195981. [PMID: 29652897 PMCID: PMC5898752 DOI: 10.1371/journal.pone.0195981] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Accepted: 04/03/2018] [Indexed: 01/02/2023] Open
Abstract
On a daily basis, planktonic organisms migrate vertically and thus experience widely varying conditions in their physico-chemical environment. In the Gulf of Finland, these changes are larger than values predicted by climate change scenarios predicted for the next century (up to 0.5 units in pH and 5°C in temperature). In this work, we are interested in how temporal variations in physico-chemical characteristics of the water column on a daily and weekly scale influence oxidative stress level and antioxidant responses in the planktonic copepod of the genus Acartia. Responses were determined from samples collected during a two-week field survey in the western Gulf of Finland, Baltic Sea. Our results showed that GST (Glutathione-S-transferase) enzyme activity increased in the surface waters between Weeks I and II, indicating antioxidant defense mechanism activation. This is most likely due to elevating temperature, pH, and dissolved oxygen observed between these two weeks. During Week II also GSSG (oxidized glutathione) was detected, indicating that copepods responded to stressor(s) in the environment. Our results suggest that Acartia copepods seem fairly tolerant to weekly fluctuations in environmental conditions in coastal and estuarine areas, in terms of antioxidant defense and oxidative stress. This could be directly connected to a very efficient glutathione cycling system acting as antioxidant defense system for neutralizing ROS and avoiding elevated levels of LPX.
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Affiliation(s)
- Olivier Glippa
- Novia University of Applied Sciences, Ekenäs, Finland
- * E-mail:
| | | | - Mirella Kanerva
- Laboratory of Animal Physiology, Department of Biology, University of Turku, Turku, Finland
| | - Anni Rein
- Novia University of Applied Sciences, Ekenäs, Finland
| | - Kristiina Vuori
- Laboratory of Animal Physiology, Department of Biology, University of Turku, Turku, Finland
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Kim BM, Rhee JS, Lee KW, Kim MJ, Shin KH, Lee SJ, Lee YM, Lee JS. UV-B radiation-induced oxidative stress and p38 signaling pathway involvement in the benthic copepod Tigriopus japonicus. Comp Biochem Physiol C Toxicol Pharmacol 2015; 167:15-23. [PMID: 25152408 DOI: 10.1016/j.cbpc.2014.08.003] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Revised: 08/08/2014] [Accepted: 08/14/2014] [Indexed: 12/17/2022]
Abstract
Ultraviolet B (UV-B) radiation presents an environmental hazard to aquatic organisms. To understand the molecular responses of the intertidal copepod Tigriopus japonicus to UV-B radiation, we measured the acute toxicity response to 96 h of UV-B radiation, and we also assessed the intracellular reactive oxygen species (ROS) levels, glutathione (GSH) content, and antioxidant enzyme (GST, GR, GPx, and SOD) activities after 24 h of exposure to UV-B with LD50 and half LD50 values. Also, expression patterns of p53 and hsp gene families with phosphorylation of p38 MAPK were investigated in UV-B-exposed copepods. We found that the ROS level, GSH content, and antioxidant enzyme activity levels were increased with the transcriptional upregulation of antioxidant-related genes, indicating that UV-B induces oxidative stress by generating ROS and stimulating antioxidant enzymatic activity as a defense mechanism. Additionally, we found that p53 expression was significantly increased after UV-B irradiation due to increases in the phosphorylation of the stress-responsive p38 MAPK, indicating that UV-B may be responsible for inducing DNA damage in T. japonicus. Of the hsp family genes, transcriptional levels of hsp20, hsp20.7, hsp70, and hsp90 were elevated in response to a low dose of UV-B radiation (9 kJ m(-2)), suggesting that these hsp genes may be involved in cellular protection against UV-B radiation. In this paper, we performed a pathway-oriented mechanistic analysis in response to UV-B radiation, and this analysis provides a better understanding of the effects of UV-B in the intertidal benthic copepod T. japonicus.
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Affiliation(s)
- Bo-Mi Kim
- Department of Biological Sciences, College of Science, Sungkyunkwan University, Suwon 440-746, South Korea
| | - Jae-Sung Rhee
- Department of Marine Science, College of Natural Sciences, Incheon National University, Incheon 406-772, South Korea
| | - Kyun-Woo Lee
- Pacific Ocean Research Center, Korea Institute of Ocean Science and Technology, Ansan 426-744, South Korea
| | - Min-Jung Kim
- Department of Life Science, College of Natural Sciences, Hanyang University, Seoul 133-791, South Korea
| | - Kyung-Hoon Shin
- Department of Marine Sciences and Convergent Technology, College of Science and Technology, Hanyang University, Ansan 426-791, South Korea
| | - Su-Jae Lee
- Department of Life Science, College of Natural Sciences, Hanyang University, Seoul 133-791, South Korea
| | - Young-Mi Lee
- Department of Life Science, College of Natural Sciences, Sangmyung University, Seoul 110-743, South Korea.
| | - Jae-Seong Lee
- Department of Biological Sciences, College of Science, Sungkyunkwan University, Suwon 440-746, South Korea.
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7
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Marija S, Dieter H. Sensitivity of photosynthesis to UV radiation in several Cosmarium strains (Zygnematophyceae, Streptophyta) is related to their geographical distribution. Photochem Photobiol Sci 2014; 13:1066-81. [DOI: 10.1039/c3pp50192b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The application of UV radiation in vitro on desmid strains collected from various climatic areas and long-term grown under identical laboratory conditions revealed their preference for specific climatic niches, as judged from their different photosynthetic behaviours.
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Chen L, Xie M, Bi Y, Wang G, Deng S, Liu Y. The combined effects of UV-B radiation and herbicides on photosynthesis, antioxidant enzymes and DNA damage in two bloom-forming cyanobacteria. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2012; 80:224-30. [PMID: 22464588 DOI: 10.1016/j.ecoenv.2012.03.007] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2012] [Revised: 02/13/2012] [Accepted: 03/09/2012] [Indexed: 05/31/2023]
Abstract
In this study, we investigated the combined effects of UV-B irradiation and herbicides (glyphosate, GPS; 2-Methyl-4-chlorophenoxyacetic acid, MCPA-Na; 3-(3,4-dichlorophenyl)-1,1-dimethylurea, DCMU) and the antioxidant (ascorbic acid, ASC) on photosynthesis, antioxidant enzymes and DNA damage in two bloom-forming cyanobacteria, Anabaena sp. and Microcystis viridis. UV-B irradiance increased reactive oxygen species (ROS) production, which decreased chlorophyll a fluorescence yield, pigment content and superoxide dismutase (SOD) activity, and increased malondialdehyde (MDA) content and caused serious DNA damage. The degree of these damages was aggravated by the addition of DCMU, GPS and MCPA, and was partially mitigated by the addition of ASC. During the recovery process, the degree and mechanism in restoring DNA damage and photosynthesis inhibition were different by the removal of UV-B and herbicides (DCMU, GPS and MCPA) in both cyanobacteria. These results suggest that the combination of UV-B and exogenous herbicides have detrimental effects on cyanobacterial metabolism through either a ROS-mediated process or by affecting the electron transport chain, and may cause the shifts in the phytoplankton community.
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Affiliation(s)
- Lanzhou Chen
- School of Resource & Environmental Sciences, Hubei Key Laboratory of Biomass-Resources Chemistry and Environmantal Biotechnology, Wuhan University, Wuhan 430079, PR China.
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Aminov RI. Horizontal gene exchange in environmental microbiota. Front Microbiol 2011; 2:158. [PMID: 21845185 PMCID: PMC3145257 DOI: 10.3389/fmicb.2011.00158] [Citation(s) in RCA: 354] [Impact Index Per Article: 27.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2011] [Accepted: 07/11/2011] [Indexed: 01/21/2023] Open
Abstract
Horizontal gene transfer (HGT) plays an important role in the evolution of life on the Earth. This view is supported by numerous occasions of HGT that are recorded in the genomes of all three domains of living organisms. HGT-mediated rapid evolution is especially noticeable among the Bacteria, which demonstrate formidable adaptability in the face of recent environmental changes imposed by human activities, such as the use of antibiotics, industrial contamination, and intensive agriculture. At the heart of the HGT-driven bacterial evolution and adaptation are highly sophisticated natural genetic engineering tools in the form of a variety of mobile genetic elements (MGEs). The main aim of this review is to give a brief account of the occurrence and diversity of MGEs in natural ecosystems and of the environmental factors that may affect MGE-mediated HGT.
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Affiliation(s)
- Rustam I Aminov
- Rowett Institute of Nutrition and Health, University of Aberdeen Aberdeen, UK
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Kim RO, Rhee JS, Won EJ, Lee KW, Kang CM, Lee YM, Lee JS. Ultraviolet B retards growth, induces oxidative stress, and modulates DNA repair-related gene and heat shock protein gene expression in the monogonont rotifer, Brachionus sp. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2011; 101:529-39. [PMID: 21276479 DOI: 10.1016/j.aquatox.2010.12.005] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2010] [Revised: 12/01/2010] [Accepted: 12/11/2010] [Indexed: 05/22/2023]
Abstract
Ultraviolet B (UV-B) radiation causes direct cellular damage by breakage of DNA strands and oxidative stress induction in aquatic organisms. To understand the effect of UV-B radiation on the rotifer, Brachionus sp., several parameters including 24-h survival rate, population growth rate, and ROS level were measured after exposure to a wide range of UV-B doses. To check the expression of other important inducible genes such as replication protein A (RPA), DNA-dependent protein kinase (DNA-PK), Ku70, Ku80, and heat shock proteins (hsps) after UV-B radiation, we observed dose- and time-dependency at 2kJ/m(2). We also examined 13 hsp genes for their roles in the UV-B damaged rotifer. Results showed that UV-B remarkably inhibited the population growth of Brachionus sp. The level of intracellular reactive oxygen species (ROS) was high at 2kJ/m(2), suggesting that 2kJ/m(2) would already be toxic. This result was supported by other enzymatic activities, such as GSH levels, glutathione peroxidase, glutathione S-transferase, and glutathione reductase. For dose dependency, low doses of UV-B radiation (2, 4, and 6kJ/m(2)) significantly up-regulated the examined genes (e.g. RPA, DNA-PK, Ku70, and Ku80). For the time course study, RPA genes showed immediate up-regulation but returned to basal or lower expression levels compared to the control 3h after UV-B exposure. The DNA-PK and Ku70/80 genes significantly increased, indicating that they may be involved in repairing processes against a low dose of UV-B exposure (2kJ/m(2)). At the basal level, the hsp90α1 gene showed the highest expression, and followed by hsp10, hsp30, hsp60, and hsc70, and hsp90β in adults (w/o egg). In eggs, the hsp10 gene was expressed the highest, and followed by hsp30, hsp27, hsp90α1, and hsp60 genes. In real-time RT-PCR array on rotifer hsp genes, low doses of UV-B radiation (2 and 4kJ/m(2)) showed up-regulation of several hsp genes but most of the hsp genes showed down-regulation at 8kJ/m(2) and higher, indicating that significant Hsp-mediated cellular damage already occurred at low doses. For the time course study of four hsp genes (hsp20, hsp27, hsp70, hsp90α1), they showed a significant correlation for UV-B radiation (2kJ/m(2)). In this paper, we demonstrated that UV-B radiation would affect growth retardation with up- or down-regulation of some important genes in DNA replication, repair process, and chaperoning. This finding provides a better understanding of molecular mechanisms involved in UV-B-mediated cellular damage in the rotifer, Brachionus sp.
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Affiliation(s)
- Ryeo-Ok Kim
- Department of Chemistry, and Research Institute for Natural Sciences, College of Natural Sciences, Hanyang University, Seoul, South Korea
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Echinoderms as Blueprints for Biocalcification: Regulation of Skeletogenic Genes and Matrices. MOLECULAR BIOMINERALIZATION 2011; 52:225-48. [DOI: 10.1007/978-3-642-21230-7_8] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Russo R, Zito F, Costa C, Bonaventura R, Matranga V. Transcriptional increase and misexpression of 14-3-3 epsilon in sea urchin embryos exposed to UV-B. Cell Stress Chaperones 2010; 15:993-1001. [PMID: 20607471 PMCID: PMC3024062 DOI: 10.1007/s12192-010-0210-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2010] [Revised: 06/15/2010] [Accepted: 06/17/2010] [Indexed: 12/19/2022] Open
Abstract
Members of the 14-3-3 protein family are involved in many important cellular events, including stress response, survival and apoptosis. Genes of the 14-3-3 family are conserved from plants to humans, and some members are responsive to UV radiation. Here, we report the isolation of the complete cDNA encoding the 14-3-3 epsilon isoform from Paracentrotus lividus sea urchin embryos, referred to as Pl14-3-3ε, and the phylogenetic relationship with other homologues described in different phyla. Pl14-3-3ε mRNA levels were measured by QPCR during development and found to increase from the mesenchyme blastula to the prism stage. In response to UV-B (312 nm) exposure, early stage embryos collected 2 h later showed a 2.3-fold (at 400 J/m(2)) and a 2.7-fold (at 800 J/m(2)) increase in Pl14-3-3ε transcript levels compared with controls. The spatial expression of Pl14-3-3ε mRNA, detected by whole mount in situ hybridization in both control and UV-B exposed embryos, harvested at late developmental stages, showed transcripts to be located in the archenteron of gastrula stage and widely distributed in all germ layers, respectively. The Pl14-3-3ε mRNA delocalization parallels the failure in archenteron elongation observed morphologically, as well as the lack of specific endoderm markers, investigated by indirect immuno-fluorescence on whole mount embryos. Results confirm the involvement of 14-3-3ε in the stress response elicited by UV-B and demonstrate, for the first time, its contribution at the transcriptional level in the sea urchin embryo.
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Affiliation(s)
- Roberta Russo
- Consiglio Nazionale delle Ricerche, Istituto di Biomedicina e Immunologia Molecolare, “Alberto Monroy”, Via Ugo La Malfa 153, 90146 Palermo, Italy
| | - Francesca Zito
- Consiglio Nazionale delle Ricerche, Istituto di Biomedicina e Immunologia Molecolare, “Alberto Monroy”, Via Ugo La Malfa 153, 90146 Palermo, Italy
| | - Caterina Costa
- Consiglio Nazionale delle Ricerche, Istituto di Biomedicina e Immunologia Molecolare, “Alberto Monroy”, Via Ugo La Malfa 153, 90146 Palermo, Italy
| | - Rosa Bonaventura
- Consiglio Nazionale delle Ricerche, Istituto di Biomedicina e Immunologia Molecolare, “Alberto Monroy”, Via Ugo La Malfa 153, 90146 Palermo, Italy
| | - Valeria Matranga
- Consiglio Nazionale delle Ricerche, Istituto di Biomedicina e Immunologia Molecolare, “Alberto Monroy”, Via Ugo La Malfa 153, 90146 Palermo, Italy
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Jung J, Kim Y, Kim J, Jeong DH, Choi K. Environmental levels of ultraviolet light potentiate the toxicity of sulfonamide antibiotics in Daphnia magna. ECOTOXICOLOGY (LONDON, ENGLAND) 2008; 17:37-45. [PMID: 17940867 DOI: 10.1007/s10646-007-0174-9] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2007] [Accepted: 09/28/2007] [Indexed: 05/25/2023]
Abstract
We assessed the phototoxicity of several major sulfonamide antibiotics, i.e., sulfathiazole, sulfamethazine, and sulfamethoxazole, using acute 48 and 96 h Daphnia magna immobilization toxicity test under several indoor and outdoor lighting conditions. The lighting conditions were as follows: (1) fluorescent light only, (2) continuous irradiation with 15 microW/cm(2) UVB, (3) pulsed irradiation with 90 microW/cm(2) UVB for 4 h/d, and (4) natural sunlight (outdoors). Laboratory tests showed that phototoxicity resulting from exposure to continuous UVB light generally increased the acute toxicity of the sulfonamides in D. magna by up to 2.3-fold. However, pulsed UVB exposure resulted in a greater increase in phototoxicity. Compared to fluorescent light only (no UVB), pulsed UVB irradiation (96 h) resulted in 12.0-, 5.8-, and 4.4-fold increases in toxicity for sulfamethazine, sulfathiazole, and sulfamethoxazole, respectively. This suggests that the mode of UV irradiation is more important than the dose (UV-intensity x exposure time) for the photo-enhancement of sulfonamide toxicity. Natural sunlight enhanced the toxicity of the sulfonamides to an even greater degree, likely because of the contribution of UVA light. This study suggests that without taking into account the effects of UV irradiation, it is possible to underestimate the actual consequences of phototoxic sulfonamide antibiotics in the aquatic environment.
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Affiliation(s)
- Jinyong Jung
- Institute of Health and Environment, School of Public Health, Seoul National University, 28 Yunkeon, Chongro, Seoul 110-799, Korea
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Gao K, Yu H, Brown MT. Solar PAR and UV radiation affects the physiology and morphology of the cyanobacterium Anabaena sp. PCC 7120. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2007; 89:117-24. [DOI: 10.1016/j.jphotobiol.2007.09.006] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2007] [Revised: 09/05/2007] [Accepted: 09/13/2007] [Indexed: 10/22/2022]
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Abstract
Prokaryotic extremophiles were the first representatives of life on Earth and they are responsible for the genesis of geological structures during the evolution and creation of all currently known ecosystems. Flexibility of the genome probably allowed life to adapt to a wide spectrum of extreme environments. As a result, modern prokaryotic diversity formed in a framework of physico-chemical factors, and it is composed of: thermophilic, psychrophilic, acidophilic, alkaliphilic, halophilic, barophilic, and radioresistant species. This artificial systematics cannot reflect the multiple actions of different environmental factors since one organism could unite characteristics of several extreme-groups. In this review we show the current status of studies in all fields of extremophiles and summarize the limits of life for different species of microbial extremophiles. We also discuss the finding of extremophiles from unusual places such as soils, and briefly review recent studies of microfossils in meteorites in the context of the significance of microbial extremophiles to Astrobiology.
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Affiliation(s)
- Elena V Pikuta
- National Space Sciences and Technology Center, NASA, Astrobiology Laboratory, Huntsville, Alabama 35805, USA.
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16
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Agogué H, Joux F, Obernosterer I, Lebaron P. Resistance of marine bacterioneuston to solar radiation. Appl Environ Microbiol 2005; 71:5282-9. [PMID: 16151115 PMCID: PMC1214640 DOI: 10.1128/aem.71.9.5282-5289.2005] [Citation(s) in RCA: 114] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2004] [Accepted: 04/19/2005] [Indexed: 11/20/2022] Open
Abstract
A total of 90 bacterial strains were isolated from the sea surface microlayer (i.e., bacterioneuston) and underlying waters (i.e., bacterioplankton) from two sites of the northwestern Mediterranean Sea. The strains were identified by sequence analysis, and growth recovery was investigated after exposure to simulated solar radiation. Bacterioneuston and bacterioplankton isolates were subjected to six different exposure times, ranging from 0.5 to 7 h of simulated noontime solar radiation. Following exposure, the growth of each isolate was monitored, and different classes of resistance were determined according to the growth pattern. Large interspecific differences among the 90 marine isolates were observed. Medium and highly resistant strains accounted for 41% and 22% of the isolates, respectively, and only 16% were sensitive strains. Resistance to solar radiation was equally distributed within the bacterioneuston and bacterioplankton. Relative contributions to the highly resistant class were 43% for gamma-proteobacteria and 14% and 8% for alpha-proteobacteria and the Cytophaga/Flavobacterium/Bacteroides (CFB) group, respectively. Within the gamma-proteobacteria, the Pseudoalteromonas and Alteromonas genera appeared to be highly resistant to solar radiation. The majority of the CFB group (76%) had medium resistance. Our study further provides evidence that pigmented bacteria are not more resistant to solar radiation than nonpigmented bacteria.
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Affiliation(s)
- Hélène Agogué
- Observatoire Océanologique, Université Pierre et Marie Curie, UMR 7621-INSU-CNRS, BP44, 66651 Banyuls-sur-Mer, France
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17
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Wu H, Gao K, Villafañe VE, Watanabe T, Helbling EW. Effects of solar UV radiation on morphology and photosynthesis of filamentous cyanobacterium Arthrospira platensis. Appl Environ Microbiol 2005; 71:5004-13. [PMID: 16151080 PMCID: PMC1214621 DOI: 10.1128/aem.71.9.5004-5013.2005] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2005] [Accepted: 03/29/2005] [Indexed: 11/20/2022] Open
Abstract
To study the impact of solar UV radiation (UVR) (280 to 400 nm) on the filamentous cyanobacterium Arthrospira (Spirulina) platensis, we examined the morphological changes and photosynthetic performance using an indoor-grown strain (which had not been exposed to sunlight for decades) and an outdoor-grown strain (which had been grown under sunlight for decades) while they were cultured with three solar radiation treatments: PAB (photosynthetically active radiation [PAR] plus UVR; 280 to 700 nm), PA (PAR plus UV-A; 320 to 700 nm), and P (PAR only; 400 to 700 nm). Solar UVR broke the spiral filaments of A. platensis exposed to full solar radiation in short-term low-cell-density cultures. This breakage was observed after 2 h for the indoor strain but after 4 to 6 h for the outdoor strain. Filament breakage also occurred in the cultures exposed to PAR alone; however, the extent of breakage was less than that observed for filaments exposed to full solar radiation. The spiral filaments broke and compressed when high-cell-density cultures were exposed to full solar radiation during long-term experiments. When UV-B was screened off, the filaments initially broke, but they elongated and became loosely arranged later (i.e., there were fewer spirals per unit of filament length). When UVR was filtered out, the spiral structure hardly broke or became looser. Photosynthetic O(2) evolution in the presence of UVR was significantly suppressed in the indoor strain compared to the outdoor strain. UVR-induced inhibition increased with exposure time, and it was significantly lower in the outdoor strain. The concentration of UV-absorbing compounds was low in both strains, and there was no significant change in the amount regardless of the radiation treatment, suggesting that these compounds were not effectively used as protection against solar UVR. Self-shading, on the other hand, produced by compression of the spirals over adaptive time scales, seems to play an important role in protecting this species against deleterious UVR. Our findings suggest that the increase in UV-B irradiance due to ozone depletion not only might affect photosynthesis but also might alter the morphological development of filamentous cyanobacteria during acclimation or over adaptive time scales.
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Affiliation(s)
- Hongyan Wu
- Marine Biology Institute, Shantou University, Shantou, Guangdong 515063, China
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Czyz A, Plata K, Wegrzyn G. Stimulation of DNA repair as an evolutionary drive for bacterial luminescence. LUMINESCENCE 2003; 18:140-4. [PMID: 12701089 DOI: 10.1002/bio.715] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
It was demonstrated recently that luminescence of a free-living marine bacterium, Vibrio harveyi, stimulates DNA repair, most probably by activation of the photoreactivation process. Here, we ask whether the stimulation of DNA repair could be an evolutionary drive that ensured maintenance and development of early bacterial luminescent systems. To test this hypothesis, we cultivated V. harveyi lux(+) bacteria and luxA mutants in mixed cultures. Initial cultures were mixed to obtain a culture consisting of roughly 50% lux(+) cells and 50% luxA mutants. Then bacteria were cultivated for several days and ratio of luminescent to dark bacteria was measured. Under these conditions, luxA mutants became highly predominant within a few days of cultivation. This indicates that, without a selective pressure, the luminescence is a disadvantage for bacteria, perhaps due to consumption of significant portion of cell energy. However, when the same experiments were repeated but cultures were irradiated with low UV doses, luminescent bacteria started to predominate shortly after the irradiation. Therefore, we conclude that stimulation of photoreactivation may be an evolutionary drive for bacterial bioluminescence.
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Affiliation(s)
- Agata Czyz
- Laboratory of Molecular Biology (affiliated with the University of Gdańsk), Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Kładki 24, 80-822 Gdańsk, Poland
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