WorldCat Identities

Châtel, Amélie

Works: 5 works in 7 publications in 2 languages and 10 library holdings
Roles: Other, Author
Publication Timeline
Most widely held works by Amélie Châtel
Voies de signalisation des MAP kinases et apoptose chez l'éponge Suberites domuncula et la moule Mytilus galloprovincialis by Amélie Châtel( Book )

3 editions published between 2009 and 2015 in French and held by 4 WorldCat member libraries worldwide

The aim of this study was to evaluate the effect of two types of pollutants, Tributyltin (TBT) and Polycyclic Aromatic Hydrocarbons (PAHs), on MAP kinase signaling pathway activation and on apoptosis induction, on two marine invertebrates, the mussel Mytilus galloprovincialis and the sponge Suberites domuncula. It was shown that animal exposure to both chemicals depicted p38 activation for all tested experimental conditions. JNK was also activated after exposure to TBT, while for HAPs exposure, JNK was activated in the mussel while ERK was activated in the sponge. Moreover, an induction of Bclx-S was observed in the mussel, protein involved in the apoptosis intrasic pathway. In the sponge, apoptosis was caspase 3-depenclent while in the mussel, apoptosis was dependent of caspase 3 induction only for some pollutant concentrations. In addition, analysis of mussels collected in situ in 19 stations of the Adriatic coast (Croatia), more or less polluted with TBT and HAPs, during winter and summer, showed an activation of the three MAP kinases p38, JNK and ERX. Activation level was correlated to the level of pollution and to the temperature. To conclude, this study had demonstrated the interest of using p38 as exposure biomarker and apoptosis as effect biomarker
Accumulation and immunotoxicity of microplastics in the estuarine worm Hediste diversicolor in environmentally relevant conditions of exposure by Messika Revel( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Investigating the establishment of primary cultures of hemocytes from Mytilus edulis by Andrew Barrick( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Is there any consistency between the microplastics found in the field and those used in laboratory experiments?( )

1 edition published in 2016 in English and held by 1 WorldCat member library worldwide

Abstract: The ubiquitous presence and persistency of microplastics (MPs) in aquatic environments are of particular concern since they represent an increasing threat to marine organisms and ecosystems. Great differences of concentrations and/or quantities in field samples have been observed depending on geographical location around the world. The main types reported have been polyethylene, polypropylene, and polystyrene. The presence of MPs in marine wildlife has been shown in many studies focusing on ingestion and accumulation in different tissues, whereas studies of the biological effects of MPs in the field are scarce. If the nature and abundance/concentrations of MPs have not been systematically determined in field samples, this is due to the fact that the identification of MPs from environmental samples requires mastery and execution of several steps and techniques. For this reason and due to differences in sampling techniques and sample preparation, it remains difficult to compare the published studies. Most laboratory experiments have been performed with MP concentrations of a higher order of magnitude than those found in the field. Consequently, the ingestion and associated effects observed in exposed organisms have corresponded to great contaminant stress, which does not mimic the natural environment. Medium contaminations are produced with only one type of polymer of a precise sizes and homogenous shape whereas the MPs present in the field are known to be a mix of many types, sizes and shapes of plastic. Moreover, MPs originating in marine environments can be colonized by organisms and constitute the sorption support for many organic compounds present in environment that are not easily reproducible in laboratory. Determination of the mechanical and chemical effects of MPs on organisms is still a challenging area of research. Among the potential chemical effects it is necessary to differentiate those related to polymer properties from those due to the sorption/desorption of organic compounds. Highlights: The nature and quantities/abundance of MPs are not systematically determined in field samples. There is an urgent need to establish standardized protocols for sampling, sample preparation, MP analysis and data expression. Laboratory experiments are often performed with MP concentrations of a higher order of magnitude than those found in the field. MP exposure conditions usually involve only one type of polymer of a precise size and homogenous shape. MP exposure conditions are not consistent with the MPs present in the field (many types, sizes, shapes). Abstract : The microplastic contaminations employed in laboratory exposures are not consistent with the exposome in terms of concentration/quantity, nature, form or size
Baseline levels of biochemical biomarkers in the endobenthic ragworm Hediste diversicolor as useful tools in biological monitoring of estuaries under anthropogenic pressure( )

1 edition published in 2018 in English and held by 1 WorldCat member library worldwide

Abstract: Identification of contamination in estuarine ecosystems that are impacted by anthropogenic pressures, such as the Seine estuary, is difficult to determine without considering the role environmental variation plays on the end points selected. Currently, there is interest in identifying methods in which the influence of confounding factors can be described and accounted for. In this context, the aim of this study was to define a baseline assessment criteria (BAC) for enzymatic biomarkers in ragworms (Hediste diversicolor) collected in a reference site (Authie). The model took into consideration the weight, temperature and salinity of the site. Values collected in the Seine estuary were analyzed with the model to determine if differences between the sites could potentially be due to contamination or were explained by environmental variation. In general, biomarker responses from the Seine estuary fell within the range of BAC, suggesting that environmental variation could explain some of the results. Highlights: Thresholds for biomarkers Multiple polynomial regression model to integrate confounding factors Characterization of polluted site using model
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