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Lenoble V, Cindrić AM, Briand JF, Pedrotti ML, Lacerda AL, Muniategui-Lorenzo S, Fernández-González V, Moscoso-Pérez CM, Andrade-Garda JM, Casotti R, Murano C, Donnarumma V, Frizzi S, Hannon C, Joyce H, Nash R, Frias J. Bioaccumulation of trace metals in the plastisphere: Awareness of environmental risk from a European perspective. Environ Pollut 2024; 348:123808. [PMID: 38521396 DOI: 10.1016/j.envpol.2024.123808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Revised: 03/08/2024] [Accepted: 03/15/2024] [Indexed: 03/25/2024]
Abstract
The term "Plastisphere" refers to the biofilm layer naturally formed by microorganisms attaching to plastic surfaces. This layer possesses the capability to adsorb persistent organic and inorganic pollutants, particularly trace metals, which are the focus of this research study. Immersion experiments were concurrently conducted in five locations spanning four European countries (France, Ireland, Spain, and Italy) utilising eight distinct polymers. These immersions, repeated every three months over a one-year period, aimed to evaluate the baseline bioaccumulation of 12 trace metals. The study underscores the intricate nature of metal bioaccumulation, influenced by both micro-scale factors (such as polymer composition) and macro-scale factors (including geographical site and seasonal variations). Villefranche Bay in France exhibited the lowest metals bioaccumulation, whereas Naples in Italy emerged as the site where bioaccumulation was often the highest for the considered metals. Environmental risk assessment was also conducted in the study. The lightweight nature of certain plastics allows them to be transported across significant distances in the ocean. Consequently, evaluating trace metal concentrations in the plastisphere is imperative for assessing potential environmental repercussions that plastics, along with their associated biota, may exert even in locations distant from their point of emission.
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Affiliation(s)
- Véronique Lenoble
- Université de Toulon, Aix Marseille Univ., CNRS, IRD, MIO, Toulon, France.
| | - Ana-Marija Cindrić
- Ruđer Bošković Institute, Center for Marine and Environmental Research, Zagreb, Croatia.
| | | | - Maria Luiza Pedrotti
- Laboratoire d'Océanographie de Villefranche sur mer (LOV), UPMC Université Paris 06, CNRS UMR 7093, Sorbonne Université, Villefranche sur Mer, France.
| | - Ana Luzia Lacerda
- Laboratoire d'Océanographie de Villefranche sur mer (LOV), UPMC Université Paris 06, CNRS UMR 7093, Sorbonne Université, Villefranche sur Mer, France
| | - Soledad Muniategui-Lorenzo
- University of A Coruña. Grupo Química Analítica Aplicada (QANAP), Instituto Universitario de Medio Ambiente (IUMA), Department of Chemistry. Faculty of Sciences. A Coruña 15071, Spain.
| | - Veronica Fernández-González
- University of A Coruña. Grupo Química Analítica Aplicada (QANAP), Instituto Universitario de Medio Ambiente (IUMA), Department of Chemistry. Faculty of Sciences. A Coruña 15071, Spain.
| | - Carmen Ma Moscoso-Pérez
- University of A Coruña. Grupo Química Analítica Aplicada (QANAP), Instituto Universitario de Medio Ambiente (IUMA), Department of Chemistry. Faculty of Sciences. A Coruña 15071, Spain.
| | - José M Andrade-Garda
- University of A Coruña. Grupo Química Analítica Aplicada (QANAP), Instituto Universitario de Medio Ambiente (IUMA), Department of Chemistry. Faculty of Sciences. A Coruña 15071, Spain.
| | | | - Carola Murano
- Stazione Zoologica Anton Dohrn, Naples, Italy; NBFC, National Biodiversity Future Center, Piazza Marina 61, 90133 Palermo, Italy.
| | - Vincenzo Donnarumma
- Institute of Marine Sciences - National Research Council ISMAR-CNR. Forte Santa Teresa Pozzuolo di Lerici, 19032 La Spezia, Italy.
| | - Sébastien Frizzi
- Université de Toulon, Aix Marseille Univ., CNRS, IRD, MIO, Toulon, France
| | - Colin Hannon
- Marine & Freshwater Research Centre, Atlantic Technological University, Dublin Road, H91 T8NW, Galway, Ireland
| | - Haleigh Joyce
- Marine & Freshwater Research Centre, Atlantic Technological University, Dublin Road, H91 T8NW, Galway, Ireland
| | - Róisín Nash
- Marine & Freshwater Research Centre, Atlantic Technological University, Dublin Road, H91 T8NW, Galway, Ireland.
| | - João Frias
- Marine & Freshwater Research Centre, Atlantic Technological University, Dublin Road, H91 T8NW, Galway, Ireland.
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Portas A, Carriot N, Ortalo-Magné A, Damblans G, Thiébaut M, Culioli G, Quillien N, Briand JF. Impact of hydrodynamics on community structure and metabolic production of marine biofouling formed in a highly energetic estuary. Mar Environ Res 2023; 192:106241. [PMID: 37922705 DOI: 10.1016/j.marenvres.2023.106241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 10/02/2023] [Accepted: 10/23/2023] [Indexed: 11/07/2023]
Abstract
Biofouling is a specific lifestyle including both marine prokaryotic and eukaryotic communities. Hydrodynamics are poorly studied parameters affecting biofouling formation. This study aimed to investigate how water dynamics in the Etel Estuary (Northwest Atlantic coasts of France) influences the colonization of artificial substrates. Hydrodynamic conditions, mainly identified as shear stress, were characterized by measuring current velocity, turbulence intensity and energy using Acoustic Doppler Current Profiler (ADCP). One-month biofouling was analyzed by coupling metabarcoding (16S rRNA, 18S rRNA and COI genes), untargeted metabolomics (liquid chromatography coupled with high-resolution mass spectrometry, LC-HRMS) and characterization of the main biochemical components of the microbial exopolymeric matrix. A higher richness was observed for biofouling communities (prokaryotes and eukaryotes) exposed to the strongest currents. Ectopleura (Cnidaria) and its putative symbionts Endozoicomonas (Gammaproteobacteria) were dominant in the less dynamic conditions. Eukaryotes assemblages were specifically shaped by shear stress, leading to drastic changes in metabolite profiles. Under high hydrodynamic conditions, the exopolymeric matrix increased and was composed of 6 times more polysaccharides than proteins, these latter playing a crucial role in the adhesion and cohesion properties of biofilms. This original multidisciplinary approach demonstrated the importance of shear stress on both the structure of marine biofouling and the metabolic response of these complex communities.
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Affiliation(s)
- Aurélie Portas
- France Energies Marines, Plouzané, France; MAPIEM, EA 4323, Université de Toulon, France
| | | | | | | | | | - Gérald Culioli
- MAPIEM, EA 4323, Université de Toulon, France; IMBE, Aix-Marseille Université, Avignon Université, CNRS, IRD, Avignon, France
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Védie E, Barry-Martinet R, Senez V, Berglin M, Stenlund P, Brisset H, Bressy C, Briand JF. Influence of Sharklet-Inspired Micropatterned Polymers on Spatio-Temporal Variations of Marine Biofouling. Macromol Biosci 2022; 22:e2200304. [PMID: 36153836 DOI: 10.1002/mabi.202200304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 09/07/2022] [Indexed: 12/25/2022]
Abstract
This article aims to show the influence of surface characteristics (microtopography, chemistry, mechanical properties) and seawater parameters on the settlement of marine micro- and macroorganisms. Polymers with nine microtopographies, three distinct mechanical properties, and wetting characteristics are immersed for one month into two contrasting coastal sites (Toulon and Kristineberg Center) and seasons (Winter and Summer). Influence of microtopography and chemistry on wetting is assessed through static contact angle and captive air bubble measurements over 3-weeks immersion in artificial seawater. Microscopic analysis, quantitative flow cytometry, metabarcoding based on the ribulose biphosphate carboxylase (rbcL) gene amplification, and sequencing are performed to characterize the settled microorganisms. Quantification of macrofoulers is done by evaluating the surface coverage and the type of organism. It is found that for long static in situ immersion, mechanical properties and non-evolutive wettability have no major influence on both abundance and diversity of biofouling assemblages, regardless of the type of organisms. The apparent contradiction with previous results, based on model organisms, may be due to the huge diversity of marine environments, both in terms of taxa and their size. Evolutive wetting properties with wetting switching back and forth over time have shown to strongly reduce the colonization by macrofoulers.
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Affiliation(s)
- Elora Védie
- Laboratoire MAPIEM, E.U. 4323, SeaTech Ecole d'Ingénieur, Université de Toulon, CS 60584, Toulon, 83041 Cedex 9, France
| | - Raphaëlle Barry-Martinet
- Laboratoire MAPIEM, E.U. 4323, SeaTech Ecole d'Ingénieur, Université de Toulon, CS 60584, Toulon, 83041 Cedex 9, France
| | - Vincent Senez
- Univ. Lille, CNRS, Inserm, CHU Lille, UMR9020-U1277 - CANTHER - Cancer Heterogeneity Plasticity and Resistance to Therapies, Lille, F-59000, France
| | - Mattias Berglin
- RISE Research Institutes of Sweden AB, Arvid Wallgrens backe 20, Göteborg, SE-413 46, Sweden
| | - Patrik Stenlund
- RISE Research Institutes of Sweden AB, Arvid Wallgrens backe 20, Göteborg, SE-413 46, Sweden
| | - Hugues Brisset
- Laboratoire MAPIEM, E.U. 4323, SeaTech Ecole d'Ingénieur, Université de Toulon, CS 60584, Toulon, 83041 Cedex 9, France
| | - Christine Bressy
- Laboratoire MAPIEM, E.U. 4323, SeaTech Ecole d'Ingénieur, Université de Toulon, CS 60584, Toulon, 83041 Cedex 9, France
| | - Jean-François Briand
- Laboratoire MAPIEM, E.U. 4323, SeaTech Ecole d'Ingénieur, Université de Toulon, CS 60584, Toulon, 83041 Cedex 9, France
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Djaoudi K, Onrubia JAT, Boukra A, Guesnay L, Portas A, Barry-Martinet R, Angeletti B, Mounier S, Lenoble V, Briand JF. Seawater copper content controls biofilm bioaccumulation and microbial community on microplastics. Sci Total Environ 2022; 814:152278. [PMID: 34902408 DOI: 10.1016/j.scitotenv.2021.152278] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 12/01/2021] [Accepted: 12/05/2021] [Indexed: 06/14/2023]
Abstract
The adsorption of trace metals on microplastics (MPs) is affected by the presence of surficial biofilms but their interactions are poorly understood. Here, we present the influence of Cu levels in real seawater (Toulon Bay, NW Mediterranean Sea) on microbial communities and Cu content of the resulting biofilms grown during incubation experiments on high density polyethylene. Two sets of incubation experiments were run with seawater supplied with MPs, sampled in two sites with contrasting Cu levels: Pt12 (most contaminated site) and Pt41P (less contaminated site). For each incubation experiment, 5 treatments were considered differing in Cu concentrations, ranging between 30 and 400 nM and between 6 and 60 nM, for Pt12 and Pt41p, respectively. A control experiment (filtered at 0.2 μm) was run in parallel for each incubation experiment. We observed that, at the time scale of the incubation period, both prokaryotic and eukaryotic richness and diversity were higher in the biofilms formed from the most contaminated site. In addition, we showed that Cu levels are shaping biofilm communities, evidencing co-occurrence patterns between prokaryotes and eukaryotes with diatoms playing a central role. These differences in biofilm formation were reflected in the amount of bioaccumulated Cu per dry weight of MPs, exhibiting higher values in the most contaminated site. Within this site, the increase of Cu seawater content enhanced its bioaccumulation onto MPs until reaching saturation. This study strongly suggests a striking link between seawater copper content, biofilm community shaping and the resulting Cu bioaccumulation onto MPs.
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Affiliation(s)
- Kahina Djaoudi
- Université de Toulon, Aix Marseille Univ., CNRS/INSU, IRD, MIO UM 110, Mediterranean Institute of Oceanography, CS 60584, 83041 Toulon, France; Department of Molecular and Cellular Biology, University of Arizona, Tucson, AZ 85721, USA.
| | - Javier Angel Tesán Onrubia
- Université de Toulon, Aix Marseille Univ., CNRS/INSU, IRD, MIO UM 110, Mediterranean Institute of Oceanography, CS 60584, 83041 Toulon, France
| | - Amine Boukra
- Université de Toulon, Aix Marseille Univ., CNRS/INSU, IRD, MIO UM 110, Mediterranean Institute of Oceanography, CS 60584, 83041 Toulon, France
| | - Lucas Guesnay
- Laboratoire MAPIEM, EA 4323, Université de Toulon, Toulon, France
| | - Aurélie Portas
- Laboratoire MAPIEM, EA 4323, Université de Toulon, Toulon, France
| | | | - Bernard Angeletti
- Aix Marseille Univ, CNRS, IRD, INRA, Coll France, CEREGE, Aix-en-Provence, France
| | - Stéphane Mounier
- Université de Toulon, Aix Marseille Univ., CNRS/INSU, IRD, MIO UM 110, Mediterranean Institute of Oceanography, CS 60584, 83041 Toulon, France
| | - Véronique Lenoble
- Université de Toulon, Aix Marseille Univ., CNRS/INSU, IRD, MIO UM 110, Mediterranean Institute of Oceanography, CS 60584, 83041 Toulon, France
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Carriot N, Barry-Martinet R, Briand JF, Ortalo-Magné A, Culioli G. Impact of phosphate concentration on the metabolome of biofilms of the marine bacterium Pseudoalteromonas lipolytica. Metabolomics 2022; 18:18. [PMID: 35290545 DOI: 10.1007/s11306-022-01875-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Accepted: 02/22/2022] [Indexed: 10/18/2022]
Abstract
INTRODUCTION Marine biofilms are the most widely distributed mode of life on Earth and drive biogeochemical cycling processes of most elements. Phosphorus (P) is essential for many biological processes such as energy transfer mechanisms, biological information storage and membrane integrity. OBJECTIVES Our aim was to analyze the effect of a gradient of ecologically relevant phosphate concentrations on the biofilm-forming capacity and the metabolome of the marine bacterium Pseudoalteromonas lipolytica TC8. METHODS In addition to the evaluation of the effect of different phosphate concentration on the biomass, structure and gross biochemical composition of biofilms of P. lipolytica TC8, untargeted metabolomics based on liquid chromatography-mass spectrometry (LC-MS) analysis was used to determine the main metabolites impacted by P-limiting conditions. Annotation of the most discriminating and statistically robust metabolites was performed through the concomitant use of molecular networking and MS/MS fragmentation pattern interpretation. RESULTS At the lowest phosphate concentration, biomass, carbohydrate content and three-dimensional structures of biofilms tended to decrease. Furthermore, untargeted metabolomics allowed for the discrimination of the biofilm samples obtained at the five phosphate concentrations and the highlighting of a panel of metabolites mainly implied in such a discrimination. A large part of the metabolites of the resulting dataset were then putatively annotated. Ornithine lipids were found in increasing quantity when the phosphate concentration decreased, while the opposite trend was observed for oxidized phosphatidylethanolamines (PEs). CONCLUSION This study demonstrated the suitability of LC-MS-based untargeted metabolomics for evaluating the effect of culture conditions on marine bacterial biofilms. More precisely, these results supported the high plasticity of the membrane of P. lipolytica TC8, while the role of the oxidized PEs remains to be clarified.
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Affiliation(s)
- Nathan Carriot
- Laboratoire MAPIEM, Université de Toulon, EA 4323, La Garde, France
| | | | | | | | - Gérald Culioli
- Laboratoire MAPIEM, Université de Toulon, EA 4323, La Garde, France.
- Institut Méditerranéen de Biodiversité et d'Ecologie Marine et Continentale (IMBE), UMR CNRS-IRD-Avignon, Université-Aix-Marseille Université, Avignon, France.
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Paix B, Potin P, Schires G, Le Poupon C, Misson B, Leblanc C, Culioli G, Briand JF. Synergistic effects of temperature and light affect the relationship between Taonia atomaria and its epibacterial community: a controlled conditions study. Environ Microbiol 2021; 23:6777-6797. [PMID: 34490980 DOI: 10.1111/1462-2920.15758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 09/03/2021] [Accepted: 09/03/2021] [Indexed: 11/29/2022]
Abstract
In the context of global warming, this study aimed to assess the effect of temperature and irradiance on the macroalgal Taonia atomaria holobiont dynamics. We developed an experimental set-up using aquaria supplied by natural seawater with three temperatures combined with three irradiances. The holobiont response was monitored over 14 days using a multi-omics approach coupling algal surface metabolomics and metabarcoding. Both temperature and irradiance appeared to shape the microbiota and the surface metabolome, but with a distinct temporality. Epibacterial community first changed according to temperature, and later in relation to irradiance, while the opposite occurred for the surface metabolome. An increased temperature revealed a decreasing richness of the epiphytic community together with an increase of several bacterial taxa. Irradiance changes appeared to quickly impact surface metabolites production linked with the algal host photosynthesis (e.g. mannitol, fucoxanthin, dimethylsulfoniopropionate), which was hypothesized to explain modifications of the structure of the epiphytic community. Algal host may also directly adapt its surface metabolome to changing temperature with time (e.g. lipids content) and also in response to changing microbiota (e.g. chemical defences). Finally, this study brought new insights highlighting complex direct and indirect responses of seaweeds and their associated microbiota under changing environments.
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Affiliation(s)
- Benoit Paix
- Université de Toulon, Laboratoire MAPIEM, La Garde, EA 4323, France
| | - Philippe Potin
- Sorbonne Université, CNRS, Integrative Biology of Marine Models (LBI2M), UMR 8227, Station Biologique de Roscoff (SBR), Roscoff, France
| | - Gaëtan Schires
- Sorbonne Université, CNRS, Center for Biological Marine Resources (CRBM), FR 2424, Station Biologique de Roscoff (SBR), Roscoff, France
| | - Christophe Le Poupon
- Université de Toulon, Aix Marseille Université, CNRS, IRD, Mediterranean Institute of Oceanography (MIO), UM110, La Garde, France
| | - Benjamin Misson
- Université de Toulon, Aix Marseille Université, CNRS, IRD, Mediterranean Institute of Oceanography (MIO), UM110, La Garde, France
| | - Catherine Leblanc
- Sorbonne Université, CNRS, Integrative Biology of Marine Models (LBI2M), UMR 8227, Station Biologique de Roscoff (SBR), Roscoff, France
| | - Gérald Culioli
- Université de Toulon, Laboratoire MAPIEM, La Garde, EA 4323, France
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Paix B, Vieira C, Potin P, Leblanc C, De Clerck O, Briand JF, Culioli G. French Mediterranean and Atlantic populations of the brown algal genus Taonia (Dictyotales) display differences in phylogeny, surface metabolomes and epibacterial communities. ALGAL RES 2021. [DOI: 10.1016/j.algal.2021.102452] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Paix B, Layglon N, Le Poupon C, D'Onofrio S, Misson B, Garnier C, Culioli G, Briand JF. Integration of spatio-temporal variations of surface metabolomes and epibacterial communities highlights the importance of copper stress as a major factor shaping host-microbiota interactions within a Mediterranean seaweed holobiont. Microbiome 2021; 9:201. [PMID: 34641951 PMCID: PMC8507236 DOI: 10.1186/s40168-021-01124-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 07/04/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND Although considered as holobionts, macroalgae and their surface microbiota share intimate interactions that are still poorly understood. Little is known on the effect of environmental parameters on the close relationships between the host and its surface-associated microbiota, and even more in a context of coastal pollutions. Therefore, the main objective of this study was to decipher the impact of local environmental parameters, especially trace metal concentrations, on an algal holobiont dynamics using the Phaeophyta Taonia atomaria as a model. Through a multidisciplinary multi-omics approach combining metabarcoding and untargeted LC-MS-based metabolomics, the epibacterial communities and the surface metabolome of T. atomaria were monitored along a spatio-temporal gradient in the bay of Toulon (Northwestern Mediterranean coast) and its surrounding. Indeed, this geographical area displays a well-described trace metal gradient particularly relevant to investigate the effect of such pollutants on marine organisms. RESULTS Epibacterial communities of T. atomaria exhibited a high specificity whatever the five environmentally contrasted collecting sites investigated on the NW Mediterranean coast. By integrating metabarcoding and metabolomics analyses, the holobiont dynamics varied as a whole. During the occurrence period of T. atomaria, epibacterial densities and α-diversity increased while the relative proportion of core communities decreased. Pioneer bacterial colonizers constituted a large part of the specific and core taxa, and their decrease might be linked to biofilm maturation through time. Then, the temporal increase of the Roseobacter was proposed to result from the higher temperature conditions, but also the increased production of dimethylsulfoniopropionate (DMSP) at the algal surface which could constitute of the source of carbon and sulfur for the catabolism pathways of these taxa. Finally, as a major result of this study, copper concentration constituted a key factor shaping the holobiont system. Thus, the higher expression of carotenoids suggested an oxidative stress which might result from an adaptation of the algal surface metabolome to high copper levels. In turn, this change in the surface metabolome composition could result in the selection of particular epibacterial taxa. CONCLUSION We showed that associated epibacterial communities were highly specific to the algal host and that the holobiont dynamics varied as a whole. While temperature increase was confirmed to be one of the main parameters associated to Taonia dynamics, the originality of this study was highlighting copper-stress as a major driver of seaweed-epibacterial interactions. In a context of global change, this study brought new insights on the dynamics of a Mediterranean algal holobiont submitted to heavy anthropic pressures. Video abstract.
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Affiliation(s)
- Benoît Paix
- Université de Toulon, Laboratoire MAPIEM, EA, 4323, Toulon, France
- Present adress: Marine Biodiversity, Naturalis Biodiversity Center, Leiden, The Netherlands
| | - Nicolas Layglon
- Université de Toulon, Aix Marseille Université, CNRS, IRD, Mediterranean Institute of Oceanography (MIO), UM, 110, Toulon, France
| | - Christophe Le Poupon
- Université de Toulon, Aix Marseille Université, CNRS, IRD, Mediterranean Institute of Oceanography (MIO), UM, 110, Toulon, France
| | - Sébastien D'Onofrio
- Université de Toulon, Aix Marseille Université, CNRS, IRD, Mediterranean Institute of Oceanography (MIO), UM, 110, Toulon, France
| | - Benjamin Misson
- Université de Toulon, Aix Marseille Université, CNRS, IRD, Mediterranean Institute of Oceanography (MIO), UM, 110, Toulon, France
| | - Cédric Garnier
- Université de Toulon, Aix Marseille Université, CNRS, IRD, Mediterranean Institute of Oceanography (MIO), UM, 110, Toulon, France
| | - Gérald Culioli
- Université de Toulon, Laboratoire MAPIEM, EA, 4323, Toulon, France.
- Present address: Institut Méditerranéen de Biodiversité et d'Ecologie marine et continentale (IMBE), UMR CNRS-IRD-Avignon Université-Aix-Marseille Université, Avignon, France.
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Catão C P E, Pollet T, Garnier C, Barry-Martinet R, Rehel K, Linossier I, Tunin-Ley A, Turquet J, Briand JF. Temperate and tropical coastal waters share relatively similar microbial biofilm communities while free-living or particle-attached communities are distinct. Mol Ecol 2021; 30:2891-2904. [PMID: 33887078 DOI: 10.1111/mec.15929] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 04/12/2021] [Accepted: 04/13/2021] [Indexed: 12/25/2022]
Abstract
Free-living (FL) marine microbial communities differ from those attached to particles (PA). Likewise, biofilms (B) colonizing artificial surfaces, including plastics or ship hulls, hardly resemble their planktonic surroundings. However, few studies have examined the effect of the environment on these lifestyles and on the source of organisms colonizing marine surfaces. Using 16S rRNA gene metabarcoding, we identified specificities of marine prokaryotic community lifestyles (FL, PA or B) sampled in three coastal polluted locations with dissimilar environmental conditions: the North-Western Mediterranean Sea and the Atlantic and Indian Oceans. Biofilms developed over polyvinyl chloride (PVC) were found to be significantly different from FL or PA collected during the immersions. Alpha-diversity increased from FL to PA and to B, illustrating the integrative aspect of the latter, with little proportion of operational taxonomic units shared with the first two. Beta-diversity clustered first the lifestyles and then the sites. FL and PA were more affected by water quality, especially by trace metal contamination, whereas B were as sensitive to trace metals as to nutrients. Although biofilms should be supplied by the planktonic (ultra) rare biosphere, source tracking could only detect small contributions of FL or PA taxa to B communities.
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Affiliation(s)
- Elisa Catão C P
- Laboratoire MAPIEM, EA 4323, Université de Toulon, Toulon, France
| | - Thomas Pollet
- Laboratoire MAPIEM, EA 4323, Université de Toulon, Toulon, France.,UMR ASTRE, Univ Montpellier, CIRAD, INRAE, Montpellier, France
| | - Cédric Garnier
- Mediterranean Institute of Oceanography, CNRS/INSU, IRD, MIO UM 110, Univ Toulon, Aix Marseille Univ, La Garde, France
| | | | - Karine Rehel
- Institut Européen de la Mer, Université de Bretagne-Sud, EA 3884, LBCM, Lorient, France
| | - Isabelle Linossier
- Institut Européen de la Mer, Université de Bretagne-Sud, EA 3884, LBCM, Lorient, France
| | | | - Jean Turquet
- CITEB/c/o CYROI, Sainte Clotilde, La Réunion, France
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Coclet C, Garnier C, D’Onofrio S, Durrieu G, Pasero E, Le Poupon C, Omanović D, Mullot JU, Misson B, Briand JF. Trace Metal Contamination Impacts Predicted Functions More Than Structure of Marine Prokaryotic Biofilm Communities in an Anthropized Coastal Area. Front Microbiol 2021; 12:589948. [PMID: 33679628 PMCID: PMC7933014 DOI: 10.3389/fmicb.2021.589948] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 01/29/2021] [Indexed: 12/25/2022] Open
Abstract
Trace metal (TM) contamination in marine coastal areas is a worldwide threat for aquatic communities. However, little is known about the influence of a multi-chemical contamination on both marine biofilm communities' structure and functioning. To determine how TM contamination potentially impacted microbial biofilms' structure and their functions, polycarbonate (PC) plates were immerged in both surface and bottom of the seawater column, at five sites, along strong TM contamination gradients, in Toulon Bay. The PC plates were incubated during 4 weeks to enable colonization by biofilm-forming microorganisms on artificial surfaces. Biofilms from the PC plates, as well as surrounding seawaters, were collected and analyzed by 16S rRNA amplicon gene sequencing to describe prokaryotic community diversity, structure and functions, and to determine the relationships between bacterioplankton and biofilm communities. Our results showed that prokaryotic biofilm structure was not significantly affected by the measured environmental variables, while the functional profiles of biofilms were significantly impacted by Cu, Mn, Zn, and salinity. Biofilms from the contaminated sites were dominated by tolerant taxa to contaminants and specialized hydrocarbon-degrading microorganisms. Functions related to major xenobiotics biodegradation and metabolism, such as methane metabolism, degradation of aromatic compounds, and benzoate degradation, as well as functions involved in quorum sensing signaling, extracellular polymeric substances (EPS) matrix, and biofilm formation were significantly over-represented in the contaminated site relative to the uncontaminated one. Taken together, our results suggest that biofilms may be able to survive to strong multi-chemical contamination because of the presence of tolerant taxa in biofilms, as well as the functional responses of biofilm communities. Moreover, biofilm communities exhibited significant variations of structure and functional profiles along the seawater column, potentially explained by the contribution of taxa from surrounding sediments. Finally, we found that both structure and functions were significantly distinct between the biofilm and bacterioplankton, highlighting major differences between the both lifestyles, and the divergence of their responses facing to a multi-chemical contamination.
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Affiliation(s)
- Clément Coclet
- Université de Toulon, Laboratoire MAPIEM, EA 4323, Toulon, France
- Université de Toulon, Aix Marseille Université, CNRS, IRD, Mediterranean Institute of Oceanography, UM110, La Garde, France
| | - Cédric Garnier
- Université de Toulon, Aix Marseille Université, CNRS, IRD, Mediterranean Institute of Oceanography, UM110, La Garde, France
| | - Sébastien D’Onofrio
- Université de Toulon, Aix Marseille Université, CNRS, IRD, Mediterranean Institute of Oceanography, UM110, La Garde, France
| | - Gaël Durrieu
- Université de Toulon, Aix Marseille Université, CNRS, IRD, Mediterranean Institute of Oceanography, UM110, La Garde, France
| | - Emilie Pasero
- Microbia Environnement Observatoire Océanologique, Banyuls-sur-Mer, France
| | - Christophe Le Poupon
- Université de Toulon, Aix Marseille Université, CNRS, IRD, Mediterranean Institute of Oceanography, UM110, La Garde, France
| | - Dario Omanović
- Division for Marine and Environmental Research, Ruðer Bošković Institute, Zagreb, Croatia
| | | | - Benjamin Misson
- Université de Toulon, Aix Marseille Université, CNRS, IRD, Mediterranean Institute of Oceanography, UM110, La Garde, France
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11
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Catao ECP, Gallois N, Fay F, Misson B, Briand JF. Metal resistance genes enrichment in marine biofilm communities selected by biocide-containing surfaces in temperate and tropical coastal environments. Environ Pollut 2021; 268:115835. [PMID: 33099201 DOI: 10.1016/j.envpol.2020.115835] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 09/28/2020] [Accepted: 10/10/2020] [Indexed: 06/11/2023]
Abstract
Microorganisms able to form biofilms in marine ecosystems are selected depending on immersed surfaces and environmental conditions. Cell attachment directly on toxic surfaces like antifouling coatings suggests a selection of tolerant (or resistant) organisms with characteristics conferring adaptive advantages. We investigated if environment would drive metal resistance gene abundance in biofilms on artificial surfaces. Biofilms were sampled from three surfaces (a PVC reference and two antifouling coatings) deployed in three coastal waters with dissimilar characteristics: The Mediterranean Sea (Toulon) and Atlantic (Lorient) and Indian (Reunion) Oceans. The two coatings differed in metals composition, either Cu thiocyanate and Zn pyrithione (A3) or Cu2O (Hy). Metal resistance genes (MRG) specific to copper (cusA, copA, cueO) or other metals (czcA and pbrT) were monitored with qPCR in parallel to the microbial community using 16S rRNA gene metabarcoding. A lower α-diversity on A3 or Hy than on PVC was observed independent on the site. Weighted Unifrac suggested segregation of communities primarily by surface, with lower site effect. Metacoder log2 fold change ratio and LeFSe discrimination suggested Marinobacter to be specific of Hy and Altererythrobacter, Erythrobacter and Sphingorhabdus of A3. Likewise, the relative abundance of MRG (MRG/bacterial 16S rRNA) varied between surfaces and sites. A3 presented the greatest relative abundances for cusA, cueO and czcA. The latter could only be amplified from A3 communities, except at Toulon. Hy surface presented the highest relative abundance for copA, specifically at Lorient. These relative abundances were correlated with LeFSe discriminant taxa. Dasania correlated positively with all MRG except cueO. Marinobacter found in greater abundance in Hy biofilm communities correlated with the highest abundances of copA and Roseovarius with czcA. These results prove the selection of specific communities with abilities to tolerate metallic biocides forming biofilms over antifouling surfaces, and the secondary but significant influence of local environmental factors.
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Affiliation(s)
- Elisa C P Catao
- Laboratoire MAPIEM, EA 4323, Université de Toulon, 83041, Toulon, France
| | - Nicolas Gallois
- Univ Toulon, Aix Marseille Univ., CNRS/INSU, IRD, MIO UM 110, Mediterranean Institute of Oceanography, La Garde, France
| | - Fabienne Fay
- Institut Européen de la Mer, Université de Bretagne-Sud, EA 3884, LBCM, Lorient, France
| | - Benjamin Misson
- Univ Toulon, Aix Marseille Univ., CNRS/INSU, IRD, MIO UM 110, Mediterranean Institute of Oceanography, La Garde, France
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12
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Carriot N, Paix B, Greff S, Viguier B, Briand JF, Culioli G. Integration of LC/MS-based molecular networking and classical phytochemical approach allows in-depth annotation of the metabolome of non-model organisms - The case study of the brown seaweed Taonia atomaria. Talanta 2020; 225:121925. [PMID: 33592802 DOI: 10.1016/j.talanta.2020.121925] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 11/24/2020] [Accepted: 11/25/2020] [Indexed: 12/15/2022]
Abstract
Untargeted LC-MS based metabolomics is a useful approach in many research areas such as medicine, systems biology, environmental sciences or even ecology. In such an approach, annotation of metabolomes of non-model organisms remains a significant challenge. In this study, an analytical workflow combining a classical phytochemical approach, using the isolation and the full characterization of the chemical structure of natural products, together with the use of MS/MS-based molecular networking with various levels of restrictiveness was developed. This protocol was applied to the marine brown seaweed Taonia atomaria, a cosmopolitan algal species, and allowed to annotate more than 200 metabolites. First, the algal organic crude extracts were fractionated by flash-chromatography and the chemical structure of eight of the main chemical constituents of this alga were fully characterized by means of spectroscopic methods (1D and 2D NMR, HRMS). These compounds were further used as chemical standards. In a second step, the main fractions of the algal extracts were analyzed by UHPLC-MS/MS and the resulting data were uploaded to the Global Natural Products Social Molecular Networking platform (GNPS) to create several molecular networks (MNs). A first MN (MN-1) was built with restrictive parameters and allowed the creation of clusters composed by nodes with highly similar MS/MS spectra. Then, using database hits and chemical standards as "seed" nodes and/or similarity between MS/MS fragmentation pattern, the main clusters were easily annotated as common glycerolipids and phospholipids, much rare lipids -such as acylglycerylhydroxymethyl-N,N,N-trimethyl-ß-alanines or fulvellic acid derivatives- but also new glycerolipids bearing a terpene moiety. Lastly, the use of less and less constrained MNs allowed to further increase the number of annotated metabolites.
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Affiliation(s)
| | - Benoît Paix
- Université de Toulon, MAPIEM, Toulon, EA 4323, France
| | - Stéphane Greff
- Aix Marseille Université, CNRS, IRD, Avignon Université, Institut Méditerranéen de Biodiversité et d'Ecologie Marine et Continentale (IMBE), Station Marine d'Endoume, Marseille, France
| | - Bruno Viguier
- Université de Toulon, MAPIEM, Toulon, EA 4323, France
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13
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Coclet C, Garnier C, Durrieu G, D'onofrio S, Layglon N, Briand JF, Misson B. Impacts of copper and lead exposure on prokaryotic communities from contaminated contrasted coastal seawaters: the influence of previous metal exposure. FEMS Microbiol Ecol 2020; 96:5809961. [PMID: 32188980 DOI: 10.1093/femsec/fiaa048] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Accepted: 03/17/2020] [Indexed: 01/04/2023] Open
Abstract
Our understanding of environmental factors controlling prokaryotic community is largely hampered by the large environmental variability across spatial scales (e.g. trace metal contamination, nutrient enrichment and physicochemical variations) and the broad diversity of bacterial pre-exposure to environmental factors. In this article, we investigated the specific influence of copper (Cu) and lead (Pb) on prokaryotic communities from the uncontaminated site, using mesocosm experiments. In addition, we studied how pre-exposure (i.e. life history) affects communities, with reference to previous metal exposure on the response of three prokaryotic communities to similar Cu exposition. This study showed a stronger influence of Cu contamination than Pb contamination on prokaryotic diversity and structure. We identified 12 and 34 bacterial families and genera, respectively, contributing to the significant differences observed in community structure between control and spiked conditions. Taken altogether, our results point toward a combination of direct negative responses to Cu contamination and indirect responses mediated by interaction with phytoplankton. These identified responses were largely conditioned by the previous exposure of community to contaminants.
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Affiliation(s)
- Clément Coclet
- Université de Toulon, Aix Marseille Université, CNRS, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 83041 Toulon, Cedex 9, Franc.,Université de Toulon, MAPIEM, EA 4323, Toulon, 83041 Toulon, Cedex 9, Franc
| | - Cédric Garnier
- Université de Toulon, Aix Marseille Université, CNRS, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 83041 Toulon, Cedex 9, Franc
| | - Gaël Durrieu
- Université de Toulon, Aix Marseille Université, CNRS, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 83041 Toulon, Cedex 9, Franc
| | - Sébastien D'onofrio
- Université de Toulon, Aix Marseille Université, CNRS, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 83041 Toulon, Cedex 9, Franc
| | - Nicolas Layglon
- Université de Toulon, Aix Marseille Université, CNRS, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 83041 Toulon, Cedex 9, Franc
| | | | - Benjamin Misson
- Université de Toulon, Aix Marseille Université, CNRS, IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 83041 Toulon, Cedex 9, Franc
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14
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Guazzelli E, Martinelli E, Pelloquet L, Briand JF, Margaillan A, Bunet R, Galli G, Bressy C. Amphiphilic hydrolyzable polydimethylsiloxane- b-poly(ethyleneglycol methacrylate- co-trialkylsilyl methacrylate) block copolymers for marine coatings. II. Antifouling laboratory tests and field trials. Biofouling 2020; 36:378-388. [PMID: 32425065 DOI: 10.1080/08927014.2020.1762868] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Revised: 04/21/2020] [Accepted: 04/23/2020] [Indexed: 06/11/2023]
Abstract
Poly(dimethylsiloxane) (PDMS) elastomer coatings containing an amphiphilic hydrolyzable diblock copolymer additive were prepared and their potential as marine antifouling and antiadhesion materials was tested. The block copolymer additive consisted of a PDMS first block and a random poly(trialkylsilyl methacrylate (TRSiMA, R = butyl, isopropyl)-co-poly(ethyleneglycol) methacrylate (PEGMA) copolymer second block. PDMS-b-TRSiMA block copolymer additives without PEGMA units were also used as additives. The amphiphilic character of the coating surface was assessed in water using the captive air bubble technique for measurements of static and dynamic contact angles. The attachment of macro- and microorganisms on the coatings was evaluated by field tests and by performing adhesion tests to the barnacle Amphibalanus amphitrite and the green alga Ulva rigida. All the additive-based PDMS coatings showed better antiadhesion properties to A. amphitrite larvae than to U. rigida spores. Field tests provided meaningful information on the antifouling and fouling release activity of coatings over an immersion period of 23 months.
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Affiliation(s)
- Elisa Guazzelli
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Pisa, Italy
| | - Elisa Martinelli
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Pisa, Italy
| | - Lucile Pelloquet
- Laboratoire MAPIEM, E.A.4323, SeaTech Ecole d'Ingénieur, Université de Toulon, Toulon Cedex 9, France
| | - Jean-François Briand
- Laboratoire MAPIEM, E.A.4323, SeaTech Ecole d'Ingénieur, Université de Toulon, Toulon Cedex 9, France
| | - André Margaillan
- Laboratoire MAPIEM, E.A.4323, SeaTech Ecole d'Ingénieur, Université de Toulon, Toulon Cedex 9, France
| | - Robert Bunet
- Institut Océanographique Paul Ricard, Six-Fours-les-Plages, France
| | - Giancarlo Galli
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Pisa, Italy
| | - Christine Bressy
- Laboratoire MAPIEM, E.A.4323, SeaTech Ecole d'Ingénieur, Université de Toulon, Toulon Cedex 9, France
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15
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Paix B, Carriot N, Barry-Martinet R, Greff S, Misson B, Briand JF, Culioli G. A Multi-Omics Analysis Suggests Links Between the Differentiated Surface Metabolome and Epiphytic Microbiota Along the Thallus of a Mediterranean Seaweed Holobiont. Front Microbiol 2020; 11:494. [PMID: 32269559 PMCID: PMC7111306 DOI: 10.3389/fmicb.2020.00494] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Accepted: 03/06/2020] [Indexed: 11/13/2022] Open
Abstract
Marine macroalgae constitute an important living resource in marine ecosystems and complex ecological interactions occur at their surfaces with microbial communities. In this context, the present study aimed to investigate how the surface metabolome of the algal holobiont Taonia atomaria could drive epiphytic microbiota variations at the thallus scale. First, a clear discrimination was observed between algal surface, planktonic and rocky prokaryotic communities. These data strengthened the hypothesis of an active role of the algal host in the selection of epiphytic communities. Moreover, significant higher epibacterial density and α-diversity were found at the basal algal parts compared to the apical ones, suggesting a maturation gradient of the community along the thallus. In parallel, a multiplatform mass spectrometry-based metabolomics study, using molecular networking to annotate relevant metabolites, highlighted a clear chemical differentiation at the algal surface along the thallus with similar clustering as for microbial communities. In that respect, higher amounts of sesquiterpenes, phosphatidylcholines (PCs), and diacylglycerylhydroxymethyl-N,N,N-trimethyl-β-alanines (DGTAs) were observed at the apical regions while dimethylsulfoniopropionate (DMSP) and carotenoids were predominantly found at the basal parts of the thalli. A weighted UniFrac distance-based redundancy analysis linking the metabolomics and metabarcoding datasets indicated that these surface compounds, presumably of algal origin, may drive the zonal variability of the epibacterial communities. As only few studies were focused on microbiota and metabolome variation along a single algal thallus, these results improved our understanding about seaweed holobionts. Through this multi-omics approach at the thallus scale, we suggested a plausible scenario where the chemical production at the surface of T. atomaria, mainly induced by the algal physiology, could explain the specificity and the variations of the surface microbiota along the thallus.
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Affiliation(s)
- Benoît Paix
- EA 4323, Matériaux Polymères Interfaces Environnement Marin, Université de Toulon, Toulon, France
| | - Nathan Carriot
- EA 4323, Matériaux Polymères Interfaces Environnement Marin, Université de Toulon, Toulon, France
| | - Raphaëlle Barry-Martinet
- EA 4323, Matériaux Polymères Interfaces Environnement Marin, Université de Toulon, Toulon, France
| | - Stéphane Greff
- UMR 7263, Aix Marseille Université, CNRS, IRD, Avignon Université, Institut Méditerranéen de Biodiversité et d'Ecologie Marine et Continentale, Station Marine d'Endoume, Marseille, France
| | - Benjamin Misson
- UMR 7294, Université de Toulon, Aix Marseille Université, CNRS, IRD, Mediterranean Institute of Oceanography, Marseille, France
| | - Jean-François Briand
- EA 4323, Matériaux Polymères Interfaces Environnement Marin, Université de Toulon, Toulon, France
| | - Gérald Culioli
- EA 4323, Matériaux Polymères Interfaces Environnement Marin, Université de Toulon, Toulon, France
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16
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Paix B, Othmani A, Debroas D, Culioli G, Briand JF. Temporal covariation of epibacterial community and surface metabolome in the Mediterranean seaweed holobiont Taonia atomaria. Environ Microbiol 2019; 21:3346-3363. [PMID: 30945796 DOI: 10.1111/1462-2920.14617] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 03/31/2019] [Indexed: 11/30/2022]
Abstract
An integrative multi-omics approach allowed monthly variations for a year of the surface metabolome and the epibacterial community of the Mediterranean Phaeophyceae Taonia atomaria to be investigated. The LC-MS-based metabolomics and 16S rDNA metabarcoding data sets were integrated in a multivariate meta-omics analysis (multi-block PLS-DA from the MixOmic DIABLO analysis) showing a strong seasonal covariation (Mantel test: p < 0.01). A network based on positive and negative correlations between the two data sets revealed two clusters of variables, one relative to the 'spring period' and a second to the 'summer period'. The 'spring period' cluster was mainly characterized by dipeptides positively correlated with a single bacterial taxon of the Alteromonadaceae family (BD1-7 clade). Moreover, 'summer' dominant epibacterial taxa from the second cluster (including Erythrobacteraceae, Rhodospirillaceae, Oceanospirillaceae and Flammeovirgaceae) showed positive correlations with few metabolites known as macroalgal antifouling defences [e.g. dimethylsulphoniopropionate (DMSP) and proline] which exhibited a key role within the correlation network. Despite a core community that represents a significant part of the total epibacteria, changes in the microbiota structure associated with surface metabolome variations suggested that both environment and algal host shape the bacterial surface microbiota.
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Affiliation(s)
- Benoît Paix
- Université de Toulon, Laboratoire MAPIEM, EA 4323, Toulon, France
| | - Ahlem Othmani
- Université de Toulon, Laboratoire MAPIEM, EA 4323, Toulon, France
| | - Didier Debroas
- Université Clermont Auvergne, CNRS, Laboratoire Microorganismes: Génome et Environnement, UMR 6023, Clermont-Ferrand, France
| | - Gérald Culioli
- Université de Toulon, Laboratoire MAPIEM, EA 4323, Toulon, France
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17
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Catão ECP, Pollet T, Misson B, Garnier C, Ghiglione JF, Barry-Martinet R, Maintenay M, Bressy C, Briand JF. Shear Stress as a Major Driver of Marine Biofilm Communities in the NW Mediterranean Sea. Front Microbiol 2019; 10:1768. [PMID: 31608016 PMCID: PMC6774042 DOI: 10.3389/fmicb.2019.01768] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Accepted: 07/17/2019] [Indexed: 12/12/2022] Open
Abstract
While marine biofilms depend on environmental conditions and substrate, little is known about the influence of hydrodynamic forces. We tested different immersion modes (dynamic, cyclic and static) in Toulon Bay (north-western Mediterranean Sea; NWMS). The static mode was also compared between Toulon and Banyuls Bays. In addition, different artificial surfaces designed to hamper cell attachment (self-polishing coating: SPC; and fouling-release coating: FRC) were compared to inert plastic. Prokaryotic community composition was affected by immersion mode, surface characteristics and site. Rhodobacteriaceae and Flavobacteriaceae dominated the biofilm community structure, with distinct genera according to surface type or immersion mode. Cell density increased with time, greatly limited by hydrodynamic forces, and supposed to delay biofilm maturation. After 1 year, a significant impact of shear stress on the taxonomic structure of the prokaryotic community developed on each surface type was observed. When surfaces contained no biocides, roughness and wettability shaped prokaryotic community structure, which was not enhanced by shear stress. Conversely, the biocidal effect of SPC surfaces, already major in static immersion mode, was amplified by the 15 knots speed. The biofilm community on SPC was 60% dissimilar to the biofilm on the other surfaces and was distinctly colonized by Sphingomonadaceae ((Alter)Erythrobacter). At Banyuls, prokaryotic community structures were more similar between the four surfaces tested than at Toulon, due possibly to a masking effect of environmental constraints, especially hydrodynamic, which was greater than in Toulon. Finally, predicted functions such as cell adhesion confirmed some of the hypotheses drawn regarding biofilm formation over the artificial surfaces tested here.
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Affiliation(s)
| | - Thomas Pollet
- Laboratoire MAPIEM (EA 4323), Université de Toulon, Toulon, France
- UMR BIPAR, INRA, ANSES, ENVA, Université Paris-Est, Maisons-Alfort, France
| | - Benjamin Misson
- CNRS/INSU, IRD, MIO UM 110, Mediterranean Institute of Oceanography, University of Toulon – Aix-Marseille University, La Garde, France
| | - Cédric Garnier
- CNRS/INSU, IRD, MIO UM 110, Mediterranean Institute of Oceanography, University of Toulon – Aix-Marseille University, La Garde, France
| | - Jean-Francois Ghiglione
- CNRS, Sorbonne Université, UMR 7621, Laboratoire d’Océanographie Microbienne, Banyuls-sur-Mer, France
| | | | - Marine Maintenay
- Laboratoire MAPIEM (EA 4323), Université de Toulon, Toulon, France
| | - Christine Bressy
- Laboratoire MAPIEM (EA 4323), Université de Toulon, Toulon, France
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18
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Coclet C, Garnier C, Durrieu G, Omanović D, D’Onofrio S, Le Poupon C, Mullot JU, Briand JF, Misson B. Changes in Bacterioplankton Communities Resulting From Direct and Indirect Interactions With Trace Metal Gradients in an Urbanized Marine Coastal Area. Front Microbiol 2019; 10:257. [PMID: 30853948 PMCID: PMC6395402 DOI: 10.3389/fmicb.2019.00257] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Accepted: 01/31/2019] [Indexed: 01/21/2023] Open
Abstract
Unraveling the relative importance of both environmental conditions and ecological processes regulating bacterioplankton communities is a central goal in microbial ecology. Marine coastal environments are among the most urbanized areas and as a consequence experience environmental pressures. The highly anthropized Toulon Bay (France) was considered as a model system to investigate shifts in bacterioplankton communities along natural and anthropogenic physicochemical gradients during a 1-month survey. In depth geochemical characterization mainly revealed strong and progressive Cd, Zn, Cu, and Pb contamination gradients between the entrance of the Bay and the north-western anthropized area. On the other hand, low-amplitude natural gradients were observed for other environmental variables. Using 16S rRNA gene sequencing, we observed strong spatial patterns in bacterioplankton taxonomic and predicted function structure along the chemical contamination gradient. Variation partitioning analysis demonstrated that multiple metallic contamination explained the largest part of the spatial biological variations observed, but DOC and salinity were also significant contributors. Network analysis revealed that biotic interactions were far more numerous than direct interactions between microbial groups and environmental variables. This suggests indirect effects of the environment, and especially trace metals, on the community through a few taxonomic groups. These spatial patterns were also partially found for predicted bacterioplankton functions, thus indicating a limited functional redundancy. All these results highlight both potential direct influences of trace metals contamination on coastal bacterioplankton and indirect forcing through biotic interactions and cascading.
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Affiliation(s)
- Clément Coclet
- Mediterranean Institute of Oceanography (MIO), UM110, CNRS, IRD, Université de Toulon, Aix-Marseille Université, Marseille, France
- MAPIEM, EA 4323, Université de Toulon, Toulon, France
| | - Cédric Garnier
- Mediterranean Institute of Oceanography (MIO), UM110, CNRS, IRD, Université de Toulon, Aix-Marseille Université, Marseille, France
| | - Gaël Durrieu
- Mediterranean Institute of Oceanography (MIO), UM110, CNRS, IRD, Université de Toulon, Aix-Marseille Université, Marseille, France
| | - Dario Omanović
- Division for Marine and Environmental Research, Ruđer Bošković Institute, Zagreb, Croatia
| | - Sébastien D’Onofrio
- Mediterranean Institute of Oceanography (MIO), UM110, CNRS, IRD, Université de Toulon, Aix-Marseille Université, Marseille, France
| | - Christophe Le Poupon
- Mediterranean Institute of Oceanography (MIO), UM110, CNRS, IRD, Université de Toulon, Aix-Marseille Université, Marseille, France
| | | | | | - Benjamin Misson
- Mediterranean Institute of Oceanography (MIO), UM110, CNRS, IRD, Université de Toulon, Aix-Marseille Université, Marseille, France
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Gevaux L, Lejars M, Margaillan A, Briand JF, Bunet R, Bressy C. Hydrolyzable Additive-Based Silicone Elastomers: A New Approach for Antifouling Coatings. Polymers (Basel) 2019; 11:E305. [PMID: 30960289 PMCID: PMC6419558 DOI: 10.3390/polym11020305] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Revised: 02/08/2019] [Accepted: 02/08/2019] [Indexed: 01/27/2023] Open
Abstract
Fouling Release Coatings are marine antifouling coatings based on silicone elastomers. Contrary to commonly used biocide-based antifouling coatings, they do not release biocides into the marine environment, however, they suffer from poor antifouling efficacy during idle periods. To improve their antifouling performances in static conditions, various amounts of hydrolyzable polymers were incorporated within a silicone matrix. These hydrolyzable polymers were chosen for the well-known hydrolytic degradation mechanism of their main chain, e.g. poly(ε-caprolactone) (PCL), or of their ester pending groups, e.g. poly(bis(trimethylsilyloxy)methylsilyl methacrylate) (PMATM2). The degradation kinetics of such hydrolyzable silicone coatings were assessed by mass loss measurements during immersion in deionized water. Coatings containing PMATM2 exhibited a maximum mass loss after 12 weeks, whereas PCL-based coatings showed no significant mass loss after 24 weeks. Dynamic contact angle measurements revealed the modifications of the coatings surface chemistry with an amphiphilic behavior after water exposure. The attachment of macrofoulers on these coatings were evaluated by field tests in the Mediterranean Sea, demonstrating the short or long-term antifouling effect of these hydrolyzable polymers embedded in the silicone matrix. The settlement of A. amphitrite barnacles on the different coatings indicated inhospitable behaviors towards larval barnacles for coatings with at least 15 wt % of additives.
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Affiliation(s)
- Laure Gevaux
- Laboratoire Matériaux Polymères Interfaces Environnement Marin (MAPIEM), Université de Toulon, EA 4323, 83957 La Garde, France.
| | - Marlène Lejars
- Laboratoire Matériaux Polymères Interfaces Environnement Marin (MAPIEM), Université de Toulon, EA 4323, 83957 La Garde, France.
| | - André Margaillan
- Laboratoire Matériaux Polymères Interfaces Environnement Marin (MAPIEM), Université de Toulon, EA 4323, 83957 La Garde, France.
| | - Jean-François Briand
- Laboratoire Matériaux Polymères Interfaces Environnement Marin (MAPIEM), Université de Toulon, EA 4323, 83957 La Garde, France.
| | - Robert Bunet
- Institut Océanographique Paul Ricard, Ile des Embiez, 83140 Six-Fours-les-Plages, France.
| | - Christine Bressy
- Laboratoire Matériaux Polymères Interfaces Environnement Marin (MAPIEM), Université de Toulon, EA 4323, 83957 La Garde, France.
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Favre L, Ortalo-Magné A, Kerloch L, Pichereaux C, Misson B, Briand JF, Garnier C, Culioli G. Metabolomic and proteomic changes induced by growth inhibitory concentrations of copper in the biofilm-forming marine bacteriumPseudoalteromonas lipolytica. Metallomics 2019; 11:1887-1899. [DOI: 10.1039/c9mt00184k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Copper exposure inP. lipolyticaTC8 revealed changes in cell membrane lipid composition and in copper cell homeostasis protein regulation.
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Affiliation(s)
| | | | | | - Carole Pichereaux
- Fédération de Recherche FR3450
- Agrobiosciences
- Interaction et Biodiversité (AIB)
- CNRS
- Toulouse
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Nguema Edzang RW, Duong TH, Briand JF, Lejars M, Raimundo JM, Bressy C, Brisset H. Bacterial anti-adhesion activity based on the electrochemical properties of polymethacrylates bearing ferrocenyl pendant groups. Biofouling 2018; 34:1055-1063. [PMID: 30626214 DOI: 10.1080/08927014.2018.1539165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Revised: 10/15/2018] [Accepted: 10/17/2018] [Indexed: 06/09/2023]
Abstract
Much current research is focused on preventing and controlling the natural process of colonization by marine organisms of surfaces submerged in seawater. Previously, the authors' laboratory has reported the synthesis and the full physico-chemical characterization of homopolymers obtained from 1-ferrocenylmethyl methacrylate (FMMA), 2-(ferrocenylmethoxy)ethyl methacrylate (FMOEMA), and 3-(ferrocenylmethoxy)propyl methacrylate (FMOPMA). Here, the bacterial anti-adhesion activity of these homopolymers (pFMMA, pFMOEMA and pFMOPMA) is reported when stimulated in 96-well microplates containing a printed electrochemical cell in each well. Polymers were deposited on the printed carbon working electrode of each well in two columns each comprising eight wells. Their electrochemical anti-adhesion properties were evaluated by inoculating a marine biofilm forming bacterial strain, Pseudoalteramonas lipolytica, in each well and then applying recurrent scans for 15 h. The results revealed an intrinsic anti-adhesion activity of all the polymers. This activity was amplified by a factor of 10 when potential recurrent scans were applied.
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Affiliation(s)
- Ronald W Nguema Edzang
- a MAPIEM-EA 4323 , Université de Toulon , Toulon Cedex 9 , France
- b Department of Chemistry and Biochemistry , University of Health Science (USS) , Libreville , Gabon
| | - The Hy Duong
- c University of Danang, University of Science and Technology , Danang , Vietnam
| | | | - Marlène Lejars
- a MAPIEM-EA 4323 , Université de Toulon , Toulon Cedex 9 , France
| | - Jean-Manuel Raimundo
- d Centre Interdisciplinaire de Nanoscience de Marseille (CINaM - UMR CNRS 7325) , Aix-Marseille Université , Marseille cedex 09 , France
| | - Christine Bressy
- a MAPIEM-EA 4323 , Université de Toulon , Toulon Cedex 9 , France
| | - Hugues Brisset
- a MAPIEM-EA 4323 , Université de Toulon , Toulon Cedex 9 , France
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Zea-Obando C, Tunin-Ley A, Turquet J, Culioli G, Briand JF, Bazire A, Réhel K, Faÿ F, Linossier I. Anti-Bacterial Adhesion Activity of Tropical Microalgae Extracts. Molecules 2018; 23:molecules23092180. [PMID: 30158494 PMCID: PMC6225251 DOI: 10.3390/molecules23092180] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Revised: 08/27/2018] [Accepted: 08/29/2018] [Indexed: 12/16/2022] Open
Abstract
The evolution of regulations concerning biocidal products aimed towards an increased protection of the environment (e.g., EU Regulation No 528/2012) requires the development of new non-toxic anti-fouling (AF) systems. As the marine environment is an important source of inspiration, such AF systems inhibiting the adhesion of organisms without any toxicity could be based on molecules of natural origin. In this context, the antibiofilm potential of tropical microalgal extracts was investigated. The tropics are particularly interesting in terms of solar energy and temperatures which provide a wide marine diversity and a high production of microalgae. Twenty microalgal strains isolated from the Indian Ocean were studied. Their extracts were characterized in terms of global chemical composition by high resolution magic angle spinning (HR-MAS) and nuclear magnetic resonance (NMR) spectroscopy, toxicity against marine bacteria (viability and growth) and anti-adhesion effect. The different observations made by confocal laser scanning microscopy (CLSM) showed a significant activity of three extracts from Dinoflagellate strains against the settlement of selected marine bacteria without any toxicity at a concentration of 50 μg/mL. The Symbiodinium sp. (P-78) extract inhibited the adhesion of Bacillus sp. 4J6 (Atlantic Ocean), Shewanella sp. MVV1 (Indian Ocean) and Pseudoalteromonas lipolytica TC8 (Mediterranean Ocean) at 60, 76 and 52%, respectively. These results underlined the potential of using microalgal extracts to repel fouling organisms.
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Affiliation(s)
- Claudia Zea-Obando
- Institut Européen de la Mer, Université de Bretagne-Sud, EA 3884, LBCM, F-56100 Lorient, France.
| | - Alina Tunin-Ley
- Laboratory c/o CYROL, NEXA, 97490 Sainte Clotilde, Reunion, France.
| | - Jean Turquet
- Laboratory c/o CYROL, NEXA, 97490 Sainte Clotilde, Reunion, France.
| | - Gérald Culioli
- MAPIEM, Biofouling et Substances Naturelles Marines, Université du Sud Toulon-Var, EA 4323, 83041 Toulon, France.
| | - Jean-François Briand
- MAPIEM, Biofouling et Substances Naturelles Marines, Université du Sud Toulon-Var, EA 4323, 83041 Toulon, France.
| | - Alexis Bazire
- Institut Européen de la Mer, Université de Bretagne-Sud, EA 3884, LBCM, F-56100 Lorient, France.
| | - Karine Réhel
- Institut Européen de la Mer, Université de Bretagne-Sud, EA 3884, LBCM, F-56100 Lorient, France.
| | - Fabienne Faÿ
- Institut Européen de la Mer, Université de Bretagne-Sud, EA 3884, LBCM, F-56100 Lorient, France.
| | - Isabelle Linossier
- Institut Européen de la Mer, Université de Bretagne-Sud, EA 3884, LBCM, F-56100 Lorient, France.
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Briand JF, Pochon X, Wood SA, Bressy C, Garnier C, Réhel K, Urvois F, Culioli G, Zaiko A. Metabarcoding and metabolomics offer complementarity in deciphering marine eukaryotic biofouling community shifts. Biofouling 2018; 34:657-672. [PMID: 30185057 DOI: 10.1080/08927014.2018.1480757] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Accepted: 05/18/2018] [Indexed: 06/08/2023]
Abstract
Metabarcoding and metabolomics were used to explore the taxonomic composition and functional diversity of eukaryotic biofouling communities on plates with antifouling paints at two French coastal sites: Lorient (North Eastern Atlantic Ocean; temperate and eutrophic) and Toulon (North-Western Mediterranean Sea; mesotrophic but highly contaminated). Four distinct coatings were tested at each site and season for one month. Metabarcoding showed biocidal coatings had less impact on eukaryotic assemblages compared to spatial and temporal effects. Ciliophora, Chlorophyceae or Cnidaria (mainly hydrozoans) were abundant at Lorient, whereas Arthropoda (especially crustaceans), Nematoda, and Ochrophyta dominated less diversified assemblages at Toulon. Seasonal shifts were observed at Lorient, but not Toulon. Metabolomics also showed clear site discrimination, but these were associated with a coating and not season dependent clustering. The meta-omics analysis enabled identifications of some associative patterns between metabolomic profiles and specific taxa, in particular those colonizing the plates with biocidal coatings at Lorient.
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Affiliation(s)
| | - Xavier Pochon
- b Coastal and Freshwater Group , Cawthron Institute , Private Bag 2 , Nelson 7042 , New Zealand
- c Institute of Marine Science , University of Auckland , Private Bag 349 , Warkworth 0941 , New Zealand
| | - Susanna A Wood
- b Coastal and Freshwater Group , Cawthron Institute , Private Bag 2 , Nelson 7042 , New Zealand
| | | | - Cédric Garnier
- d Université de Toulon , PROTEE-EA 3819 , Toulon , France
| | - Karine Réhel
- e Université de Bretagne Sud , LBCM-EA 3883 , IUEM , Lorient , France
| | - Félix Urvois
- a Université de Toulon , MAPIEM-EA 4323 , Toulon , France
| | - Gérald Culioli
- a Université de Toulon , MAPIEM-EA 4323 , Toulon , France
| | - Anastasija Zaiko
- b Coastal and Freshwater Group , Cawthron Institute , Private Bag 2 , Nelson 7042 , New Zealand
- c Institute of Marine Science , University of Auckland , Private Bag 349 , Warkworth 0941 , New Zealand
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Brisset H, Briand JF, Barry-Martinet R, Duong TH, Frère P, Gohier F, Leriche P, Bressy C. 96X Screen-Printed Gold Electrode Platform to Evaluate Electroactive Polymers as Marine Antifouling Coatings. Anal Chem 2018; 90:4978-4981. [DOI: 10.1021/acs.analchem.8b00357] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Hugues Brisset
- Laboratoire Matériaux Polymères-Interfaces-Environnement Marin (MAPIEM EA 4323), Université de Toulon, CS 60584, 83041 Toulon cedex 9, France
| | - Jean-François Briand
- Laboratoire Matériaux Polymères-Interfaces-Environnement Marin (MAPIEM EA 4323), Université de Toulon, CS 60584, 83041 Toulon cedex 9, France
| | - Raphaëlle Barry-Martinet
- Laboratoire Matériaux Polymères-Interfaces-Environnement Marin (MAPIEM EA 4323), Université de Toulon, CS 60584, 83041 Toulon cedex 9, France
| | - The Hy Duong
- Laboratoire Matériaux Polymères-Interfaces-Environnement Marin (MAPIEM EA 4323), Université de Toulon, CS 60584, 83041 Toulon cedex 9, France
- University of DANANG, University of Science and Technology, 54 Nguyen Luong Bang, Danang, Vietnam
| | - Pierre Frère
- Université d’Angers, MOLTECH-Anjou, UMR CNRS 6200, groupe SCL, UFR Sciences, 2 bd Lavoisier, 49045 Angers, France
| | - Frédéric Gohier
- Université d’Angers, MOLTECH-Anjou, UMR CNRS 6200, groupe SCL, UFR Sciences, 2 bd Lavoisier, 49045 Angers, France
| | - Philippe Leriche
- Université d’Angers, MOLTECH-Anjou, UMR CNRS 6200, groupe SCL, UFR Sciences, 2 bd Lavoisier, 49045 Angers, France
| | - Christine Bressy
- Laboratoire Matériaux Polymères-Interfaces-Environnement Marin (MAPIEM EA 4323), Université de Toulon, CS 60584, 83041 Toulon cedex 9, France
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Briand JF, Barani A, Garnier C, Réhel K, Urvois F, LePoupon C, Bouchez A, Debroas D, Bressy C. Spatio-Temporal Variations of Marine Biofilm Communities Colonizing Artificial Substrata Including Antifouling Coatings in Contrasted French Coastal Environments. Microb Ecol 2017; 74:585-598. [PMID: 28374061 DOI: 10.1007/s00248-017-0966-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Accepted: 03/14/2017] [Indexed: 06/07/2023]
Abstract
Surface colonization in seawater first corresponds to the selection of specific microbial biofilm communities. By coupling flow cytometry, microscopy and high throughput sequencing (HTS, 454 pyrosequencing) with artificial surfaces and environmental analyses, we intend to identify the contribution of biofilm community drivers at two contrasted French sites, one temperate and eutrophic (Lorient, Atlantic coast) and the other at a mesotrophic but highly contaminated bay (Toulon, North-Western Mediterranean Sea). Microbial communities were shaped by high temperatures, salinity and lead at Toulon by but nutrients and DOC at Lorient. Coatings including pyrithione exhibited a significant decrease of their microbial densities except for nanoeukaryotes. Clustering of communities was mainly based on the surface type and secondly the site, whereas seasons appeared of less importance. The in-depth HTS revealed that γ- and α-proteobacteria, but also Bacteroidetes, dominated highly diversified bacterial communities with a relative low β-diversity. Sensitivity to biocides released by the tested antifouling coatings could be noticed at different taxonomic levels: the percentage of Bacteroidetes overall decreased with the presence of pyrithione, whereas the α/γ-proteobacteria ratio decreased at Toulon when increased at Lorient. Small diatom cells (Amphora and Navicula spp.) dominated on all surfaces, whereas site-specific sub-dominant taxa appeared clearly more sensitive to biocides. This overall approach exhibited the critical significance of surface characteristics in biofilm community shaping.
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Affiliation(s)
| | - Aude Barani
- CNRS/INSU, IRD, Institut Méditerranéen d'Océanologie (MIO), Université d'Aix-Marseille, Université de Toulon, Marseille, France
| | | | - Karine Réhel
- LBCM -EA 3883, IUEM, Université de Bretagne Sud, Lorient, France
| | - Félix Urvois
- MAPIEM-EA 4323, Université de Toulon, La Garde, France
| | | | - Agnès Bouchez
- UMR CARRTEL, INRA, Université Savoie Mont Blanc, Thonon-Les-Bains, France
| | - Didier Debroas
- Laboratoire "Microorganismes: Génome et Environnement, Clermont Université, Université Blaise Pascal, BP 10448, F-63000, Clermont-Ferrand, France
- UMR 6023, LMGE, CNRS, F-63171, Aubiere, France
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Faye D, Duong TH, Vieitez I, Gohier F, Brisset H, Frère P, Briand JF, Leriche P, Bressy C. Electroactive polyacrylates bearing linear conjugated systems based on EDOT moieties. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.04.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Othmani A, Briand JF, Ayé M, Molmeret M, Culioli G. Surface metabolites of the brown alga Taonia atomaria have the ability to regulate epibiosis. Biofouling 2016; 32:801-13. [PMID: 27353006 DOI: 10.1080/08927014.2016.1198954] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Accepted: 06/02/2016] [Indexed: 06/06/2023]
Abstract
This study aimed to improve understanding of the strategies developed by the Mediterranean seaweed Taonia atomaria to chemically control bacterial epibiosis. An experimental protocol was optimized to specifically extract algal surface-associated metabolites by a technique involving dipping in organic solvents whilst the integrity of algal cell membranes was assessed by fluorescent microscopy. This methodology was validated using mass spectrometry-based profiles of algal extracts and analysis of their principal components, which led to the selection of methanol as the extraction solvent with a maximum exposure time of 15 s. Six compounds (A-F) were identified in the resulting surface extracts. Two of these surface-associated compounds (B and C) showed selective anti-adhesion properties against reference bacterial strains isolated from artificial surfaces while remaining inactive against epibiotic bacteria of T. atomaria. Such specificity was not observed for commercial antifouling biocides and other molecules identified in the surface or whole-cell extracts of T. atomaria.
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Dufosse L, Bazire A, Blache Y, Bleriot L, Bressy C, Briand JF, Copin D, Culioli G, Delbury M, Fay F, Grondin I, Linossier I, Mangrie L, Réhel K, Sauleau P, Taye T, Tunin-Ley A, Turquet J, Obando CZ, Zubia M. Tropical microalgae isolated on Reunion island (France, Indian Ocean) as sources of antifouling molecules: The BIOPAINTROP project. N Biotechnol 2016. [DOI: 10.1016/j.nbt.2016.06.749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Duong TH, Briand JF, Margaillan A, Bressy C. Polysiloxane-based block copolymers with marine bacterial anti-adhesion properties. ACS Appl Mater Interfaces 2015; 7:15578-15586. [PMID: 26121104 DOI: 10.1021/acsami.5b04234] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Di- and triblock copolymers based on tert-butyldimethylsilyl methacrylate (MASi) and poly(dimethylsiloxane) (PDMS) macro-RAFT agents were synthesized resulting in copolymers with predictable molar masses and low dispersities (Đ < 1.2). The block copolymers exhibited two glass transition temperatures, corresponding to the PDMS- and poly(tert-butyldimethylsilyl methacrylate) (PMASi)-enriched phases, respectively. Contact angle measurements revealed the influence of the copolymer composition on their surface free energy, with block copolymers exhibiting surface free energies as low as 15.0 mJ m(-2). A laboratory assay using 96-well plates was used to assess the activity of the block copolymers against two marine bacteria (Pseudoalteromonas sp. and Shewanella sp.) isolated from the Mediterranean Sea. Coatings based on PDMS-based block copolymers demonstrated anti-adhesive performances against the two strains better than that of the coating containing only PMASi-based polymers. Coatings based on diblock copolymers demonstrated antifouling performances in the field that were better than those of the corresponding coatings containing triblock copolymers. Results of both lab and field assays showed that the antifouling properties were related to coatings possessing the highest receding water contact angle.
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Affiliation(s)
- The Hy Duong
- †Université de Toulon, Laboratoire MAPIEM, EA 4323, 83957 La Garde, France
- ‡The University of Danang, University of Science and Technology, 54 Nguyen Luong Bang, Danang, Vietnam
| | | | - André Margaillan
- †Université de Toulon, Laboratoire MAPIEM, EA 4323, 83957 La Garde, France
| | - Christine Bressy
- †Université de Toulon, Laboratoire MAPIEM, EA 4323, 83957 La Garde, France
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Prevost GP, Xu S, Garrido M, Serova M, Vewer OD, Gespach C, Briand JF, Tijeras-Raballand A, Gutmann M, Hendrix A, Sabbah M, Chachereau A, Gramont AD, Neamati N, Carniato D, Pitty MH, Foster P. Abstract 1812: XCE853: A novel PDI inhibitor that inhibits proliferation of human tumor cells in vitro, ex-vivo and in vivo. Cancer Res 2014. [DOI: 10.1158/1538-7445.am2014-1812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
XCE853 was originally identified within a family of synthetic compounds displaying a preferential antiproliferative activity on drug resistant human cancer cells (Gutmann et al, AACR annual meeting, 2013). XCE853 induced an irreversible cytolysis of human tumor cells after a short in vitro exposure independently of efflux pumps leading to a tumor cell death by autophagy and particles release (vesicles or protein aggregates).
The interest for XCE853 has been reinforced by three in vitro observations: 1) XCE853 inhibits the recombinant human enzyme PDI recognized as one novel target linked to drug resistance 2) XCE853 has a unique antiproliferative profile compared to the NCI database compounds when using the NCI Compare assay and 3) XCE853 has no activity on human normal prostate cells even at high concentrations whereas XCE shows an IC50 in the nanomolar range on human tumoral cells.
In addition, the ex-vivo approach using fresh human tumor explants cultivated in 3 dimensions with low concentrations of XCE853 has shown a strong decrease of the proliferation (KI-67 labeling) with an apoptosis induction (Caspase-3 labeling) of Head & Neck cancers following 24h of exposure.
Finally, XCE853 which displayed an excellent oral bioavailability in mouse is able to block growth of human ovarian cancer using in vivo xenograft model leading to a complete tumor growth arrest even after the stop of the treatment.
Altogether, these data support further efforts on this drug candidate to initiate the preclinical studies and to define the most relevant human tumor types.
Citation Format: Gregoire P. Prevost, Shili Xu, Marine Garrido, Maria Serova, Olivier DE Vewer, Christian Gespach, Jean-François Briand, Annemilaï Tijeras-Raballand, Mathieu Gutmann, An Hendrix, Michele Sabbah, Anne Chachereau, Armand de Gramont, Nouri Neamati, Denis Carniato, Marc-Henry Pitty, Paul Foster. XCE853: A novel PDI inhibitor that inhibits proliferation of human tumor cells in vitro, ex-vivo and in vivo. [abstract]. In: Proceedings of the 105th Annual Meeting of the American Association for Cancer Research; 2014 Apr 5-9; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2014;74(19 Suppl):Abstract nr 1812. doi:10.1158/1538-7445.AM2014-1812
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Affiliation(s)
| | | | | | | | | | | | | | | | | | - An Hendrix
- 5Laboratory of Experimental Cancer Research, Gent, Belgium
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Nguyen XC, Longeon A, Pham VC, Urvois F, Bressy C, Trinh TTV, Nguyen HN, Phan VK, Chau VM, Briand JF, Bourguet-Kondracki ML. Antifouling 26,27-cyclosterols from the Vietnamese marine sponge Xestospongia testudinaria. J Nat Prod 2013; 76:1313-1318. [PMID: 23829580 DOI: 10.1021/np400288j] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Three new C29 sterols with a cyclopropane ring cyclized between C-26 and C-27 of the side chain, aragusterol I (1), 21-O-octadecanoyl-xestokerol A (4), and 7β-hydroxypetrosterol (5b), were isolated from the Vietnamese marine sponge Xestospongia testudinaria, along with the known compounds, aragusterol B (2), xestokerol A (3), 7α-hydroxypetrosterol (5a), 7-oxopetrosterol (6), and petrosterol (7). The structures of the new compounds were established by analysis of spectroscopic data including 1D and 2D NMR, and high-resolution electrospray ionization mass spectrometry (HRESIMS). Their capacity to inhibit the adhesion of isolated bacteria from marine biofilms was evaluated against the bacterial strains Pseudoalteromonas sp. D41, Pseudoalteromonas sp. TC8, and Polaribacter sp. TC5. Aragusterol B (2) and 21-O-octadecanoyl-xestokerol A (4) exhibited the most potent antifouling activity with EC50 values close to these reported in the literature for tributyltin oxide, a marine anti-biofouling agent now considered to be a severe marine pollutant. Due to its comparable activity to tributyltin oxide and its absence of toxicity, the new 26,27-cyclosterol, 21-O-octadecanoyl-xestokerol A (4) constitutes a promising scaffold for further investigations.
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Affiliation(s)
- Xuan Cuong Nguyen
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Caugiay, Hanoi, Vietnam
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Briand JF, Djeridi I, Jamet D, Coupé S, Bressy C, Molmeret M, Le Berre B, Rimet F, Bouchez A, Blache Y. Pioneer marine biofilms on artificial surfaces including antifouling coatings immersed in two contrasting French Mediterranean coast sites. Biofouling 2012; 28:453-63. [PMID: 22582937 DOI: 10.1080/08927014.2012.688957] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Marine biofilm communities that developed on artificial substrata were investigated using molecular and microscopic approaches. Polystyrene, Teflon® and four antifouling (AF) paints were immersed for 2 weeks at two contrasting sites near Toulon on the French Mediterranean coast (Toulon military harbour and the natural protected area of Porquerolles Island). Biofilms comprising bacteria and diatoms were detected on all the coatings. The population structure as well as the densities of the microorganisms differed in terms of both sites and coatings. Lower fouling densities were observed at Porquerolles Island compared to Toulon harbour. All bacterial communities (analysed by PCR-DGGE) showed related structure, controlled both by the sites and the type of substrata. Pioneer microalgal communities were dominated by the same two diatom species, viz. Licmophora gracilis and Cylindrotheca closterium, at both sites, irrespective of the substrata involved. However, the density of diatoms followed the same trend at both sites with a significant effect of all the AF coatings compared to Teflon and polystyrene.
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Pénez N, Culioli G, Pérez T, Briand JF, Thomas OP, Blache Y. Antifouling properties of simple indole and purine alkaloids from the Mediterranean gorgonian Paramuricea clavata. J Nat Prod 2011; 74:2304-2308. [PMID: 21939218 DOI: 10.1021/np200537v] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Chemical investigation of the Mediterranean gorgonian Paramuricea clavata resulted in the isolation of two new alkaloids, 2-bromo-N-methyltryptamine (1) and 3-bromo-N-methyltyramine (2), together with nine known compounds (3-10 and linderazulene). The bromoindole derivative 3 is reported herein for the first time from a natural source. The chemical structures of these compounds were assigned by spectroscopic analyses and comparison with literature values. The antifouling activity and toxicity of compounds 1-10 were assessed using three marine biofilm bacteria and the Microtox assay. In contrast to commercial antifoulants, bufotenine (5) and 1,3,7-trimethylisoguanine (10) showed significant antiadhesion activity against one bacterial strain while being nontoxic.
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Affiliation(s)
- Nicolas Pénez
- Laboratoire MAPIEM, EA 4323, Biofouling et Substances Naturelles Marines, Université du Sud Toulon-Var, Avenue de l'Université, BP 20132, F-83957 La Garde Cedex, France
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Camps M, Briand JF, Guentas-Dombrowsky L, Culioli G, Bazire A, Blache Y. Antifouling activity of commercial biocides vs. natural and natural-derived products assessed by marine bacteria adhesion bioassay. Mar Pollut Bull 2011; 62:1032-1040. [PMID: 21414639 DOI: 10.1016/j.marpolbul.2011.02.031] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2010] [Revised: 02/15/2011] [Accepted: 02/18/2011] [Indexed: 05/30/2023]
Abstract
Biofilm formation is a key step during marine biofouling, the natural colonization of immersed substrata, leading to major economic and ecological consequences. Consequently, bacteria have been used for the screening of new non-toxic antifoulants: the adhesion of five strains isolated on three French locations was monitored using a fluorescence-based assay and toxicity was also evaluated. Nine biocides including commercial, natural and natural-derived products were tested. The commercial antifoulants, TBTO and Sea Nine showed low EC(50) but high toxicity. The non-commercial products TFA-Z showed significant anti-adhesion activities and appeared to be non-toxic, suggesting a specific anti-adhesion mechanism. In addition, the strains could be classified depending on their sensitivity to the molecules used even if strain sensitivity also depended on the molecules tested. In conclusion, TFA-Z would be a promising candidate as non-toxic antifoulant and our results strengthen the need to perform antifouling bioassays with a panel of strains showing different response profiles.
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Affiliation(s)
- Mercedes Camps
- Laboratoire MAPIEM, EA 4323, Biofouling et Substances Naturelles Marines, Université du Sud Toulon-Var, 83162 La Valette-du-Var, France
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Viano Y, Bonhomme D, Camps M, Briand JF, Ortalo-Magné A, Blache Y, Piovetti L, Culioli G. Diterpenoids from the Mediterranean brown alga Dictyota sp. evaluated as antifouling substances against a marine bacterial biofilm. J Nat Prod 2009; 72:1299-304. [PMID: 19548693 DOI: 10.1021/np900102f] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Four new cyclized diterpenes, one xenicane (1) and three dolabellanes (2-4), were isolated, along with seven previously reported metabolites [3beta-hydroxydilophol (5), dictyols E (6) and C (7), hydroxycrenulide (8), 9-acetoxy-15-hydroxy-1,6-dollabelladiene (9), hydroxyacetyldictyolal (10), and fucoxanthin], from a Mediterranean species of Dictyota sp. collected in Le Brusc Lagoon (French Mediterranean coast). Their structures, as well as their relative configurations, were determined through extensive spectrometric (IR, HRESIMS, 1D and 2D NMR) data analysis and molecular modeling studies and by comparison with those reported in literature. Some of the isolated metabolites were evaluated for their antiadhesion activity against a marine bacterial biofilm (Pseudoalteromonas sp. D41).
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Affiliation(s)
- Yannick Viano
- Universite du Sud Toulon-Var, Avenue de l'Universite, BP 20132, F-83957 La Garde Cedex, France
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Humpage AR, Ledreux A, Fanok S, Bernard C, Briand JF, Eaglesham G, Papageorgiou J, Nicholson B, Steffensen D. Application of the neuroblastoma assay for paralytic shellfish poisons to neurotoxic freshwater cyanobacteria: interlaboratory calibration and comparison with other methods of analysis. Environ Toxicol Chem 2007; 26:1512-9. [PMID: 17665694 DOI: 10.1897/06-064r1.1] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Paralytic shellfish poisons (PSPs) are produced by freshwater cyanobacteria and pose a threat to human and animal drinking-water supplies. The wide range of toxin analogues (and the likelihood that further analogues remain to be discovered) means that chromatographic methods are not always reliable indicators of toxicity. Although the mouse bioassay remains the method of choice in the seafood industry, its use is increasingly being questioned on ethical grounds. The cell-based Neuro-2A neuroblastoma toxicity assay is an alternative bioassay validated for testing shellfish extracts, so it was of interest to determine its applicability with the different suite of toxin analogues produced by cyanobacteria. Cyanobacterial bloom samples from Australia, Brazil, and France were assayed using the neuroblastoma assay, liquid chromatography-tandem mass spectrometry (LC-MS/MS), high-performance liquid chromatography with postcolumn derivatization and fluorescence detection, and the Jellett Rapid Test for PSP. To assess interlaboratory variability, the neuroblastoma assay was set up in laboratories in Paris (France) and Adelaide (Australia). Neuroblastoma and chromatographic methods gave comparable results except in the case of the neurotoxic Brazilian samples: LC-MS/MS did not detect the putative new PSPs contained in these samples. Inter- and intralaboratory variability of the neuroblastoma assay was typical of biological assays but no greater than that found for interassay variability between different chromatographic determinations. The batch of Jellett Rapid Tests for PSP used did not yield quantitative results. Overall, the neuroblastoma assay was useful as a screening assay for determination of toxicity caused by saxitoxin neurotoxins in freshwater cyanobacteria, having the advantage of being sensitive to unidentified toxins that currently cannot be quantified by chromatographic means.
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Affiliation(s)
- Andrew R Humpage
- Australian Water Quality Centre, Private Mail Bag 3, Salisbury, South Australia 5108, Australia.
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Zaros C, Briand JF, Boulard Y, Labarre-Mariotte S, Garcia-Lopez MC, Thuriaux P, Navarro F. Functional organization of the Rpb5 subunit shared by the three yeast RNA polymerases. Nucleic Acids Res 2006; 35:634-47. [PMID: 17179178 PMCID: PMC1802627 DOI: 10.1093/nar/gkl686] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2006] [Revised: 07/30/2006] [Accepted: 09/07/2006] [Indexed: 12/05/2022] Open
Abstract
Rpb5, a subunit shared by the three yeast RNA polymerases, combines a eukaryotic N-terminal module with a globular C-end conserved in all non-bacterial enzymes. Conditional and lethal mutants of the moderately conserved eukaryotic module showed that its large N-terminal helix and a short motif at the end of the module are critical in vivo. Lethal or conditional mutants of the C-terminal globe altered the binding of Rpb5 to Rpb1-beta25/26 (prolonging the Bridge helix) and Rpb1-alpha44/47 (ahead of the Switch 1 loop and binding Rpb5 in a two-hybrid assay). The large intervening segment of Rpb1 is held across the DNA Cleft by Rpb9, consistent with the synergy observed for rpb5 mutants and rpb9Delta or its RNA polymerase I rpa12Delta counterpart. Rpb1-beta25/26, Rpb1-alpha44/45 and the Switch 1 loop were only found in Rpb5-containing polymerases, but the Bridge and Rpb1-alpha46/47 helix bundle were universally conserved. We conclude that the main function of the dual Rpb5-Rpb1 binding and the Rpb9-Rpb1 interaction is to hold the Bridge helix, the Rpb1-alpha44/47 helix bundle and the Switch 1 loop into a closely packed DNA-binding fold around the transcription bubble, in an organization shared by the two other nuclear RNA polymerases and by the archaeal and viral enzymes.
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Affiliation(s)
- Cécile Zaros
- Service de Biochimie & Génétique Moléculaire.Bâtiment 144 CEA-Saclay, F-91191, Gif-sur-Yvette, CEDEX, France
| | - Jean-François Briand
- Service de Biochimie & Génétique Moléculaire.Bâtiment 144 CEA-Saclay, F-91191, Gif-sur-Yvette, CEDEX, France
| | - Yves Boulard
- Service de Biochimie & Génétique Moléculaire.Bâtiment 144 CEA-Saclay, F-91191, Gif-sur-Yvette, CEDEX, France
| | - Sylvie Labarre-Mariotte
- Service de Biochimie & Génétique Moléculaire.Bâtiment 144 CEA-Saclay, F-91191, Gif-sur-Yvette, CEDEX, France
| | - M. Carmen Garcia-Lopez
- Department Biología Experimental—Area de Genética (ED.B3) Universidad de Jaén Paraje lasLagunillas E-23071 Jaén, SPAIN
| | - Pierre Thuriaux
- Service de Biochimie & Génétique Moléculaire.Bâtiment 144 CEA-Saclay, F-91191, Gif-sur-Yvette, CEDEX, France
| | - Francisco Navarro
- Department Biología Experimental—Area de Genética (ED.B3) Universidad de Jaén Paraje lasLagunillas E-23071 Jaén, SPAIN
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Le Jeune AH, Charpin M, Deluchat V, Briand JF, Lenain JF, Baudu M, Amblard C. Effect of copper sulphate treatment on natural phytoplanktonic communities. Aquat Toxicol 2006; 80:267-80. [PMID: 17095105 DOI: 10.1016/j.aquatox.2006.09.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2006] [Revised: 09/12/2006] [Accepted: 09/13/2006] [Indexed: 05/12/2023]
Abstract
Copper sulphate treatment is widely used as a global and empirical method to remove or control phytoplankton blooms without precise description of the impact on phytoplanktonic populations. The effects of two copper sulphate treatments on natural phytoplanktonic communities sampled in the spring and summer seasons, were assessed by indoor mesocosm experiments. The initial copper-complexing capacity of each water sample was evaluated before each treatment. The copper concentrations applied were 80 microg l(-1) and 160 microg l(-1) of copper, below and above the water complexation capacity, respectively. The phytoplanktonic biomass recovered within a few days after treatment. The highest copper concentration, which generated a highly toxic environment, caused a global decrease in phytoplankton diversity, and led to the development and dominance of nanophytoplanktonic Chlorophyceae. In mesocosms treated with 80 microg l(-1) of copper, the effect on phytoplanktonic community size-class structure and composition was dependent on seasonal variation. This could be related to differences in community composition, and thus to species sensitivity to copper and to differences in copper bioavailability between spring and summer. Both treatments significantly affected cyanobacterial biomass and caused changes in the size-class structure and composition of phytoplanktonic communities which may imply modifications of the ecosystem structure and function.
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Affiliation(s)
- Anne-Hélène Le Jeune
- UMR CNRS 6023, Laboratoire de Biologie des Protistes, Université Clermont-Ferrand II, 24, Avenue des Landais, 63177 Aubière Cedex, France
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Abstract
Toxigenic cyanobacteria are photosynthetic prokaryotes that are most often recognized in marine and freshwater systems, such as lakes, ponds, rivers, and estuaries. When environmental conditions (such as light, nutrients, water column stability, etc.) are suitable for their growth, cyanobacteria may proliferate and form toxic blooms in the upper, sunlit layers. The biology and ecology of cyanobacteria have been extensively studied throughout the world during the last two decades, but we still know little about the factors and processes involved in regulating toxin production for many cyanobacterial species. In this minireview, we discuss these microorganisms, and more especially the toxins they produce, as a potential and important health risk for wild and domestic animals.
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Affiliation(s)
- Jean-François Briand
- INRA, UMR CARRTEL, Equipe Microbiologie Aquatique, BP 511, 74203 Thonon Cedex, France
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Bernard C, Harvey M, Briand JF, Biré R, Krys S, Fontaine JJ. Toxicological comparison of diverse Cylindrospermopsis raciborskii strains: evidence of liver damage caused by a French C raciborskii strain. Environ Toxicol 2003; 18:176-86. [PMID: 12740803 DOI: 10.1002/tox.10112] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The freshwater cyanobacterium Cylindrospermopsis raciborskii is known to produce toxic effects in several countries. Acute and chronic exposures to C. raciborskii in Australia have been linked to liver damage (hepatotoxicity) with concomitant effects on the kidneys, adrenal glands, small intestine, lungs, thymus, and heart. The alkaloid cylindrospermopsin, which produces these toxic effects, is thought to be a potent inhibitor of protein synthesis. C. raciborskii strains producing cylindrospermopsin or analogue alkaloids have also been reported in Florida, USA, and Thailand. Brazilian isolates of C. raciborskii are also toxic but act by a different mechanism, causing acute death in mice with neurotoxic symptoms similar to those induced by the saxitoxins. In this article we compare the toxicity in the mouse of a C. raciborskii French strain with C. raciborskii strains from various other sources (Australia, Brazil, Mexico, and Hungary). We tested the toxicity of cell extracts by a mouse bioassay. Acute, fatal neurotoxicity was produced by the Brazilian strain, which was confirmed by liquid chromatography with fluorescence detection of the cell extracts, which revealed the presence of saxitoxin, neosaxitoxin, and decarbamoylsaxitoxin, along with two unidentified compounds. Acute hepatotoxicity with severe liver, kidney, and thymus damage was observed with the Australian cylindrospermopsin-producing strain. The Mexican and Hungarian strains were not found to be toxic to mice in our experimental conditions. No animals died after exposure to the extracts of the French C. raciborskii strain. Histological examination of the liver revealed moderate, multifocal necrosis characterized by small areas of hepatocellular necrosis, combined with disorganization of the parenchyma and congestion of the inner sinusoid. These symptoms and lesions resembled those induced by cylindrospermopsin, but the chemical analysis performed by liquid chromatography coupled with either a diode array detector or a mass spectrometer demonstrated that this toxin was not present in our culture extract.
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Affiliation(s)
- C Bernard
- USM0505 Ecosystèmes et interactions toxiques, Muséum National d'Histoire Naturelle, 12 rue Buffon, F-75005 Paris, France.
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Briand JF, Robillot C, Quiblier-Llobéras C, Humbert JF, Couté A, Bernard C. Environmental context of Cylindrospermopsis raciborskii (Cyanobacteria) blooms in a shallow pond in France. Water Res 2002; 36:3183-3192. [PMID: 12188114 DOI: 10.1016/s0043-1354(02)00016-7] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Cylindrospermopsis raciborskii, a potentially toxic blooming cyanobacterium (blue-green alga), responsible for public health problems in Australia, was identified in France in 1994 in a shallow pond south of Paris. A program monitoring the occurrence of C. raciborskii in this pond was conducted from July 1998 to October 1999. The phytoplankton assemblages were studied, and limnological parameters (water temperature, dissolved oxygen, pH, conductivity, and dissolved inorganic nutrients) were measured. By multivariate analysis (principal component analysis), we showed that sufficiently high temperatures to allow the germination of akinetes, relatively low nutrient concentrations (soluble reactive phosphorus with a mean concentration of 1 microM and nitrate between 0 and 5 microM, except in February 1999 (21 microM)) and a characteristic high and constant sulfate concentration (8981+/-471 microM) seemed to be the main factors involved in the proliferation of C. raciborskii in the "Francs-Pêcheurs" (FP) pond. In the light of these findings and of bibliographic data, C. raciborskii would seem to be characterized by good adaptability, but also by low competitiveness with other phytoplanktonic species in the temperate study area.
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Affiliation(s)
- J F Briand
- Laboratoire de Cryptogamie, Muséum National d'Histoire Naturelle, Paris, France
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Briand JF, Navarro F, Rematier P, Boschiero C, Labarre S, Werner M, Shpakovski GV, Thuriaux P. Partners of Rpb8p, a small subunit shared by yeast RNA polymerases I, II and III. Mol Cell Biol 2001; 21:6056-65. [PMID: 11486042 PMCID: PMC87322 DOI: 10.1128/mcb.21.17.6056-6065.2001] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2000] [Accepted: 06/06/2001] [Indexed: 11/20/2022] Open
Abstract
Rpb8p, a subunit common to the three yeast RNA polymerases, is conserved among eukaryotes and absent from noneukaryotes. Defective mutants were found at an invariant GGLLM motif and at two other highly conserved amino acids. With one exception, they are clustered on the Rpb8p structure. They all impair a two-hybrid interaction with a fragment conserved in the largest subunits of RNA polymerases I (Rpa190p), II (Rpb1p), and III (Rpc160p). This fragment corresponds to the pore 1 module of the RNA polymerase II crystal structure and bears a highly conserved motif (P.I.KP.LW.GKQ) facing the GGLLM motif of Rpb8p. An RNA polymerase I mutant (rpa190-G728D) at the invariant glycyl of P.I.KP.LW.GKQ provokes a temperature-sensitive defect. Increasing the gene dosage of another common subunit, Rpb6p, suppresses this phenotype. It also suppresses a conditional growth defect observed when replacing Rpb8p by its human counterpart. Hence, Rpb6p and Rpb8p functionally interact in vivo. These two subunits are spatially separated by the pore 1 module and may also be possibly connected by the disorganized N half of Rpb6p, not included in the present structure data. Human Rpb6p is phosphorylated at its N-terminal Ser2, but an alanyl replacement at this position still complements an rpb6-Delta null allele. A two-hybrid interaction also occurs between Rpb8p and the product of orphan gene YGR089w. A ygr089-Delta null mutant has no detectable growth defect but aggravates the conditional growth defect of rpb8 mutants, suggesting that the interaction with Rpb8p may be physiologically relevant.
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Affiliation(s)
- J F Briand
- Service de Biochimie and Génétique Moléculaire, CEA/Saclay, F-91191 Gif-sur-Yvette, France
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Briand JF, Navarro F, Gadal O, Thuriaux P. Cross talk between tRNA and rRNA synthesis in Saccharomyces cerevisiae. Mol Cell Biol 2001; 21:189-95. [PMID: 11113194 PMCID: PMC88793 DOI: 10.1128/mcb.21.1.189-195.2001] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2000] [Accepted: 10/09/2000] [Indexed: 11/20/2022] Open
Abstract
Temperature-sensitive RNA polymerase III (rpc160-112 and rpc160-270) mutants were analyzed for the synthesis of tRNAs and rRNAs in vivo, using a double-isotopic-labeling technique in which cells are pulse-labeled with [(33)P]orthophosphate and coextracted with [(3)H]uracil-labeled wild-type cells. Individual RNA species were monitored by Northern blot hybridization or amplified by reverse transcription. These mutants impaired the synthesis of RNA polymerase III transcripts with little or no influence on mRNA synthesis but also largely turned off the formation of the 25S, 18S, and 5.8S mature rRNA species derived from the common 35S transcript produced by RNA polymerase I. In the rpc160-270 mutant, this parallel inhibition of tRNA and rRNA synthesis also occurred at the permissive temperature (25 degrees C) and correlated with an accumulation of 20S pre-rRNA. In the rpc160-112 mutant, inhibition of rRNA synthesis and the accumulation of 20S pre-rRNA were found only at 37 degrees C. The steady-state rRNA/tRNA ratio of these mutants reflected their tRNA and rRNA synthesis pattern: the rpc160-112 mutant had the threefold shortage in tRNA expected from its preferential defect in tRNA synthesis at 25 degrees C, whereas rpc160-270 cells completely adjusted their rRNA/tRNA ratio down to a wild-type level, consistent with the tight coupling of tRNA and rRNA synthesis in vivo. Finally, an RNA polymerase I (rpa190-2) mutant grown at the permissive temperature had an enhanced level of pre-tRNA, suggesting the existence of a physiological coupling between rRNA synthesis and pre-tRNA processing.
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Affiliation(s)
- J F Briand
- Service de Biochimie et Génétique Moléculaire, CEA-Saclay, F-91191 Gif Sur Yvette Cedex, France
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Flores A, Briand JF, Gadal O, Andrau JC, Rubbi L, Van Mullem V, Boschiero C, Goussot M, Marck C, Carles C, Thuriaux P, Sentenac A, Werner M. A protein-protein interaction map of yeast RNA polymerase III. Proc Natl Acad Sci U S A 1999; 96:7815-20. [PMID: 10393904 PMCID: PMC22144 DOI: 10.1073/pnas.96.14.7815] [Citation(s) in RCA: 122] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The structure of the yeast RNA polymerase (pol) III was investigated by exhaustive two-hybrid screening using a library of random genomic fragments fused to the Gal4 activation domain. This procedure allowed us to identify contacts between individual polypeptides, localize the contact domains, and deduce a protein-protein interaction map of the multisubunit enzyme. In all but one case, pol III subunits were able to interact in vivo with one or sometimes two partner subunits of the enzyme or with subunits of TFIIIC. Four subunits that are common to pol I, II, and III (ABC27, ABC14.5, ABC10alpha, and ABC10beta), two that are common to pol I and III (AC40 and AC19), and one pol III-specific subunit (C11) can associate with defined regions of the two large subunits. These regions overlapped with highly conserved domains. C53, a pol III-specific subunit, interacted with a 37-kDa polypeptide that copurifies with the enzyme and therefore appears to be a unique pol III subunit (C37). Together with parallel interaction studies based on dosage-dependent suppression of conditional mutants, our data suggest a model of the pol III preinitiation complex.
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Affiliation(s)
- A Flores
- Service de Biochimie et Génétique Moléculaire, Bât. 142, Commissariat à l'Energie Atomique/Saclay, F-91191 Gif-sur-Yvette Cedex, France
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Abstract
The unavoidable senescence process that limits the vegetative growth of Podospora anserina is always associated with an accumulation of various classes of circular, tandemly arranged, defective mitochondrial DNA molecules (senDNAs). The monomers of the senDNAs belonging to the so-called beta class share a common core, but differ in both their length and termini. To understand the mechanism leading to their formation, we have determined the junction sequence of 36 senDNA beta monomers present in various senescent cultures. In most cases, we observe that: (1) short direct repeats precisely bound the senDNA beta termini and (2) one copy of the repeats is retained in the senDNA sequence. Moreover, PCR analysis of the mitochondrial DNA of some of the senescent cultures, has allowed us to detect another genome which is exactly lacking the sequence of the senDNA beta found in the culture. These results demonstrate that an intramolecular unequal cross-over occurring between short direct repeats can generate deleted mtDNA molecules in P. anserina. In addition, the polymorphism displayed by one pair of repeats allows us to establish that this cross-over may be associated with a short conversion tract spanning a few (about 15) nucleotides.
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Affiliation(s)
- C Jamet-Vierny
- Centre de Génétique Moléculaire, Centre national de la Recherche Scientifique, F-91198 Gif sur Yvette cedex, France
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