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Di and tripeptides from marine sources can target adipogenic process and contribute to decrease adipocyte number and functions ArchiMer
Ben Henda, Yesmine; Laamari, Mariem; Lanneluc, Isabelle; Travers, Marie-agnes; Agogue, Helene; Arnaudin, Ingrid; Bridiau, Nicolas; Maugard, Thierry; Piot, Jean-marie; Sannier, Frederic; Bordenave-juchereau, Stephanie.
The effect of 11 marine-derived cryptides was investigated on proliferation, differentiation and maturation of human white pre-adipocytes (HWP). They were all formerly identified as potent Angiotensin-Converting-Enzyme inhibitors.Val-Trp (VW),Val-Tyr (VY), Lys-Tyr (KY), Lys-Trp (KW), Ile-Tyr (IY), Ala-Pro (AP),Val-Ile-Tyr (VIY), Leu-Lys-Pro (LKP), Gly-Pro-Leu (GPL), Ala-Lys-Lys (AKK) and Val-Ala-Pro (VAP) were previously found in fish products and coproducts as well as other marine resources like wakame. Treatment with AP, VAP and AKK greatly affected viability of HWP during the proliferation period while KW and VW treatment reduced the number of viable cells during the differentiation stage. A GPL and IY incubation during the differentiation stage allowed...
Tipo: Text Palavras-chave: Bioactive peptides; Obesity; Human white pre-adipocytes'; Proliferation; Differentiation; Adipocyte differentiation markers.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00269/38014/36308.pdf
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Spatiotemporal variations in microbial diversity across the three domains of life in a tropical thalassohaline lake (Dziani Dzaha, Mayotte Island) ArchiMer
Hugoni, Mylene; Escalas, Arthur; Bernard, Cecile; Nicolas, Sebastien; Jezequel, Didier; Vazzoler, Fanny; Sarazin, Gerard; Leboulanger, Christophe; Bouvy, Marc; Got, Patrice; Ader, Magali; Troussellier, Marc; Agogue, Helene.
Thalassohaline ecosystems are hypersaline environments originating from seawater in which sodium chloride is the most abundant salt and the pH is alkaline. Studies focusing on microbial diversity in thalassohaline lakes are still scarce compared with those on athalassohaline lakes such as soda lakes that have no marine origin. In this work, we investigated multiple facets of bacterial, archaeal and eukaryotic diversity in the thalassohaline Lake Dziani Dzaha using a metabarcoding approach. We showed that bacterial and archaeal diversity were mainly affected by contrasting physicochemical conditions retrieved at different depths. While photosynthetic microorganisms were dominant in surface layers, chemotrophic phyla (Firmicutes or Bacteroidetes) and...
Tipo: Text Palavras-chave: Archaea; Bacteria; Eukaryotes; Extreme environment; Metabarcoding; Thalassohaline lake.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00464/57564/59738.pdf
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Bacterial Dynamics in a Microphytobenthic Biofilm: a Tidal Mesocosm Approach ArchiMer
Agogue, Helene; Mallet, Clarisse; Orvain, Francis; De Crignis, Margot; Mornet, Francoise; Dupuy, Christine.
In intertidal mudflats, during low tide exposure, microphytobenthos (MPB) migrate vertically through the surface sediment and form, with the heterotrophic bacteria, a transient biofilm. Inside this biofilm, multiple interactions exist between MPB and bacteria. These micro-organisms secrete a wide range of extracellular polymeric substances (EPS), which are major components of the biofilm matrix. In this study, we used a tidal mesocosm experiment in order to decipher the interactions of the MPB-EPS-bacteria complex within the biofilm. We tried to determine if the EPS could control bacterial activities and/or production and/or richness according to the age of the biofilm and to the immersion/emersion period. The dynamics of biomasses of MPB and prokaryotes,...
Tipo: Text Palavras-chave: Muddy sediment; Microphytobenthos; Bacteria; Extracellular polymeric substances; Interactions; Mesocosm.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00181/29271/27682.pdf
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Key Role of Alphaproteobacteria and Cyanobacteria in the Formation of Stromatolites of Lake Dziani Dzaha (Mayotte, Western Indian Ocean) ArchiMer
Gerard, Emmanuelle; De Goeyse, Siham; Hugoni, Mylene; Agogue, Helene; Richard, Laurent; Milesi, Vincent; Guyot, Francois; Lecourt, Lena; Borensztajn, Stephan; Joseph, Marie-beatrice; Leclerc, Thomas; Sarazin, Gerard; Jezequel, Didier; Leboulanger, Christophe; Ader, Magali.
Lake Dziani Dzaha is a thalassohaline tropical crater lake located on the "Petite Terre" Island of Mayotte (Comoros archipelago, Western Indian Ocean). Stromatolites are actively growing in the shallow waters of the lake shores. These stromatolites are mainly composed of aragonite with lesser proportions of hydromagnesite, calcite, dolomite, and phyllosilicates. They are morphologically and texturally diverse ranging from tabular covered by a cauliflower-like crust to columnar ones with a smooth surface. High-throughput sequencing of bacterial and archaeal 16S rRNA genes combined with confocal laser scanning microscopy (CLSM) analysis revealed that the microbial composition of the mats associated with the stromatolites was clearly distinct from that of the...
Tipo: Text Palavras-chave: Stromatolites; Alkaline lake; Pleurocapsales; Mg-silicate; Alphaproteobacteria; Anoxygenic phototrophic bacteria; Aragonite; Hydromagnesite.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00443/55451/56970.pdf
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Microbial Diversity and Cyanobacterial Production in Dziani Dzaha Crater Lake, a Unique Tropical Thalassohaline Environment ArchiMer
Leboulanger, Christophe; Agogue, Helene; Bernard, Cecile; Bouvy, Marc; Carre, Claire; Cellamare, Maria; Duval, Charlotte; Fouilland, Eric; Got, Patrice; Intertaglia, Laurent; Lavergne, Celine; Le Floc'H, Emilie; Roques, Cecile; Sarazin, Gerard.
This study describes, for the first time, the water chemistry and microbial diversity in Dziani Dzaha, a tropical crater lake located on Mayotte Island (Comoros archipelago, Western Indian Ocean). The lake water had a high level of dissolved matter and high alkalinity (10.614.5 g L-1 eq. CO32-, i.e. 160220 mM compare to around 22.5 in seawater), with salinity up to 52 psu, 1.5 higher than seawater. Hierarchical clustering discriminated Dziani Dzaha water from other alkaline, saline lakes, highlighting its thalassohaline nature. The phytoplankton biomass was very high, with a total chlorophyll a concentration of 524 to 875 mu g chl a L-1 depending on the survey, homogeneously distributed from surface to bottom (4 m). Throughout the whole water column the...
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Ano: 2017 URL: https://archimer.ifremer.fr/doc/00625/73731/74808.pdf
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Response of Core Microbial Consortia to Chronic Hydrocarbon Contaminations in Coastal Sediment Habitats ArchiMer
Jeanbille, Mathilde; Gury, Jerome; Duran, Robert; Tronczynski, Jacek; Agogue, Helene; Ben Said, Olfa; Ghiglione, Jean-francois; Auguet, Jean-christophe.
Traditionally, microbial surveys investigating the effect of chronic anthropogenic pressure such as polyaromatic hydrocarbons (PAHs) contaminations consider just the alpha and beta diversity and ignore the interactions among the different taxa forming the microbial community. Here, we investigated the ecological relationships between the three domains of life (i.e., Bacteria, Archaea, and Eukarya) using 454 pyrosequencing on the 16S rRNA and 18S rRNA genes from chronically impacted and pristine sediments, along the coasts of the Mediterranean Sea (Gulf of Lion, Vermillion coast, Corsica, Bizerte lagoon and Lebanon) and the French Atlantic Ocean (Bay of Biscay and English Channel). Our approach provided a robust ecological framework for the partition of the...
Tipo: Text Palavras-chave: Co-occurrence network; Core community; Microbial consortia; PAH; Chronic contamination; Coastal sediment.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00355/46586/46394.pdf
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Microbial community structure in the sea surface microlayer at two contrasting coastal sites in the northwestern Mediterranean Sea ArchiMer
Joux, Fabien; Agogue, Helene; Obernosterer, Ingrid; Dupuy, Christine; Reinthaler, Thomas; Herndl, Gerhard J.; Lebaron, Philippe.
In an attempt to compare the microbial community structure between the sea surface microlayer (SML) and subsurface waters (SSW), we determined the enrichment factors (EF: the ratio of abundance or activity in the SML to abundance or activity in SSW) of 13 biological parameters. Samples were taken at 2 contrasting coastal sites in the Mediterranean Sea, corresponding to a high (Barcelona, Spain) and low (Banyuls-sur-Mer, France) urbanized area. Principal component analysis showed that temporal variability was much higher at Barcelona than at Banyuls, and that the characteristics of the SML and SSW samples were more closely related at Barcelona. At both sites, the SML was weakly enriched in heterotrophic bacteria (on average 1.1-fold), Synechococcus spp. (on...
Tipo: Text Palavras-chave: Sea surface microlayer; Enrichment factor; Microbial structure; Virus-like particles; Bacteria; Microalgae; Nanoflagellates.
Ano: 2006 URL: https://archimer.ifremer.fr/doc/00243/35434/33961.pdf
Registros recuperados: 7
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