11 research outputs found
Mise en évidence de protéines révélant une réponse au stress adaptative divergente entre les espÚces Dreissena polymorpha et Dreissena rostriformis bugensis
International audienceZebra mussels Dreissena polymorpha, are bivalve molluscs used in ecotoxicology, as a sentinel species with, among other things, a strong bioaccumulation capacity. The quagga mussel, Dreissena rostriformis bugensis, has more recently colonized Western Europe. Also invasive, it competes with zebra mussels for habitats and, in some areas, has completely replaced it. Its use as a sentinel species is envisaged but requires understanding the mechanisms involved during the adaptive stress response and comparing them to those of the zebra mussel, which are better characterized. With this in mind, an exposure of the two species to a classical contaminant was performed to compare their responses. The individuals were exposed to a concentration of 100 ÎŒg / L of cadmium for 7 days, and then the gill proteins were separated by two-dimensional electrophoresis and the variable abundance proteoforms were identified by mass spectrometry. The functional analysis reveals promising elements for the study of the adaptive response in both species. A difference of expression of actors of the energy metabolism pathways points a physiological difference, with a reallocation of energy as well as the appearance of truncated proteins.Les moules zĂ©brĂ©es, Dreissena polymorpha sont des mollusques bivalves utilisĂ©s en Ă©cotoxicologie comme espĂšces sentinelles du fait, entre autre, de leur capacitĂ© de bioaccumulation. La moule quagga, Dreissena rostriformis bugensis, a colonisĂ© plus rĂ©cemment l'Europe occidentale. Egalement invasive, elle est en compĂ©tition avec la moule zĂ©brĂ©e pour les habitats et, dans certaines zones, l'a complĂštement remplacĂ©e. Son utilisation en tant qu'espĂšce sentinelle est envisagĂ©e mais nĂ©cessite de comprendre les mĂ©canismes mis en jeu au cours de la rĂ©ponse adaptative au stress et de les comparer Ă ceux de la moule zĂ©brĂ©e, mieux caractĂ©risĂ©s. Dans cette optique, une exposition des deux espĂšces Ă un contaminant classique a Ă©tĂ© rĂ©alisĂ©e afin de comparer leurs rĂ©ponses. Les individus ont Ă©tĂ© exposĂ©s Ă une concentration de 100ÎŒg/L de cadmium pendant 7 jours, puis les protĂ©ines des branchies ont Ă©tĂ© sĂ©parĂ©es par Ă©lectrophorĂšse bidimensionnelle et les protĂ©oformes d'abondance variable ont Ă©tĂ© identifiĂ©es par spectromĂ©trie de masse. L'analyse fonctionnelle rĂ©vĂšle des Ă©lĂ©ments prometteurs pour l'Ă©tude de la rĂ©ponse adaptative chez les deux espĂšces. Une diffĂ©rence d'expression d'acteurs des voies du mĂ©tabolisme Ă©nergĂ©tique pointe une diffĂ©rence physiologique, avec une rĂ©allocation de l'Ă©nergie ainsi que l'apparition de protĂ©ines tronquĂ©es
PROtéome de Stress chez une EspÚce sentinelle : recherche de nouveaux marqueurs pour la surveillance environnementale
Aquatic organisms are able to adapt to the toxic effects of chemical contaminants in the water. The qualitative study of these responses is even more crucial in a climate change context. The search for biomarkers in ecotoxicology is key to developing tools for environmental monitoring. In this context, proteomics on sentinel bivalve species, such as marine mussels (genus: Mytilus) and freshwater mussels (genus: Dreissena), represent an open approach providing new knowledge on the molecular and cellular mechanisms involved in stress responses. A bioinformatic exploitation of previously acquired proteomic data was performed using results from a series of chemical and/or thermal stress experiments. The strategy was to recombine and cross-reference the acquired data in order to identify recurrent proteins. This work was completed by a literature review which led to a selection of candidates. As expected, i. chaperone proteins involved in the recycling, folding and maintenance of protein conformations, ii. cytoskeleton dynamics facilitators, iii. enzymes involved in the maintenance of ATP production and finally, iv. proteins involved in the cell redox balance were in the forefront. This work has highlighted candidates with a strong biomarker potential, e.g.: 14-3-3-Δ Protein, Heat Shock Protein 40, Major Vault Protein and Phosphoenolpyruvate carboxykinase. In addition, partial proteoforms were revealed; their importance as stress markers was discussed. This work represents a preliminary step for developing new biomarkers, therefore, the proposed candidates will need further study before field application.Les organismes aquatiques sont capables de rĂ©pondre de maniĂšre adaptative aux effets toxiques des contaminants chimiques prĂ©sents dans lâeau. LâĂ©tude qualitative de ces rĂ©ponses est encore plus cruciale dans un contexte de changements climatiques. La recherche de biomarqueurs en Ă©cotoxicologie constitue une clĂ© pour dĂ©velopper des outils pour la surveillance environnementale. Dans ce contexte, la protĂ©omique sur des espĂšces sentinelles bivalves, telles que les moules marines du genre Mytilus et les moules dulcicoles du genre Dreissena, est une approche ouverte qui amĂšne des connaissances nouvelles sur les mĂ©canismes molĂ©culaires et cellulaires mis en jeu dans les rĂ©ponses au stress. Une exploitation bioinformatique de donnĂ©es de protĂ©omique dĂ©jĂ acquises a Ă©tĂ© rĂ©alisĂ©e en utilisant les rĂ©sultats issus dâune sĂ©rie dâexpĂ©riences de stress chimiques et/ou thermiques. La stratĂ©gie a Ă©tĂ© de recribler et croiser les donnĂ©es acquises afin de recenser les protĂ©ines impliquĂ©es de façon rĂ©currente. Ce travail a Ă©tĂ© complĂ©tĂ© par une analyse bibliographique qui a amenĂ© une sĂ©lection de candidats. De façon attendue, ont Ă©tĂ© mis en avant i. lâimplication des protĂ©ines chaperonnes intervenant dans le recyclage, le repliement et le maintien des conformations des protĂ©ines, ii. des acteurs associĂ©s Ă la dynamique du cytosquelette, iii. des enzymes impliquĂ©es dans le maintien de la production dâATP et enfin, iv. des molĂ©cules participant Ă lâĂ©quilibre redox de la cellule. Ces travaux ont mis en Ă©vidence des candidats avec un fort potentiel biomarqueur, parmi lesquels : la protĂ©ine 14-3-3-Δ, la Heat Shock Protein 40, la Major Vault Protein et la phosphoĂ©nolpyruvate carboxykinase. De plus, des protĂ©oformes partielles ont Ă©tĂ© rĂ©vĂ©lĂ©es ; leur importance comme marqueur de stress a Ă©tĂ© discutĂ©e. Ce travail reprĂ©sente une Ă©tape prĂ©alable au dĂ©veloppement de nouveaux biomarqueurs. Les candidats proposĂ©s devront faire lâobjet dâune Ă©tude plus approfondie
PROtéome de Stress chez une EspÚce sentinelle : recherche de nouveaux marqueurs pour la surveillance environnementale
Aquatic organisms are able to adapt to the toxic effects of chemical contaminants in the water. The qualitative study of these responses is even more crucial in a climate change context. The search for biomarkers in ecotoxicology is key to developing tools for environmental monitoring. In this context, proteomics on sentinel bivalve species, such as marine mussels (genus: Mytilus) and freshwater mussels (genus: Dreissena), represent an open approach providing new knowledge on the molecular and cellular mechanisms involved in stress responses. A bioinformatic exploitation of previously acquired proteomic data was performed using results from a series of chemical and/or thermal stress experiments. The strategy was to recombine and cross-reference the acquired data in order to identify recurrent proteins. This work was completed by a literature review which led to a selection of candidates. As expected, i. chaperone proteins involved in the recycling, folding and maintenance of protein conformations, ii. cytoskeleton dynamics facilitators, iii. enzymes involved in the maintenance of ATP production and finally, iv. proteins involved in the cell redox balance were in the forefront. This work has highlighted candidates with a strong biomarker potential, e.g.: 14-3-3-Δ Protein, Heat Shock Protein 40, Major Vault Protein and Phosphoenolpyruvate carboxykinase. In addition, partial proteoforms were revealed; their importance as stress markers was discussed. This work represents a preliminary step for developing new biomarkers, therefore, the proposed candidates will need further study before field application.Les organismes aquatiques sont capables de rĂ©pondre de maniĂšre adaptative aux effets toxiques des contaminants chimiques prĂ©sents dans lâeau. LâĂ©tude qualitative de ces rĂ©ponses est encore plus cruciale dans un contexte de changements climatiques. La recherche de biomarqueurs en Ă©cotoxicologie constitue une clĂ© pour dĂ©velopper des outils pour la surveillance environnementale. Dans ce contexte, la protĂ©omique sur des espĂšces sentinelles bivalves, telles que les moules marines du genre Mytilus et les moules dulcicoles du genre Dreissena, est une approche ouverte qui amĂšne des connaissances nouvelles sur les mĂ©canismes molĂ©culaires et cellulaires mis en jeu dans les rĂ©ponses au stress. Une exploitation bioinformatique de donnĂ©es de protĂ©omique dĂ©jĂ acquises a Ă©tĂ© rĂ©alisĂ©e en utilisant les rĂ©sultats issus dâune sĂ©rie dâexpĂ©riences de stress chimiques et/ou thermiques. La stratĂ©gie a Ă©tĂ© de recribler et croiser les donnĂ©es acquises afin de recenser les protĂ©ines impliquĂ©es de façon rĂ©currente. Ce travail a Ă©tĂ© complĂ©tĂ© par une analyse bibliographique qui a amenĂ© une sĂ©lection de candidats. De façon attendue, ont Ă©tĂ© mis en avant i. lâimplication des protĂ©ines chaperonnes intervenant dans le recyclage, le repliement et le maintien des conformations des protĂ©ines, ii. des acteurs associĂ©s Ă la dynamique du cytosquelette, iii. des enzymes impliquĂ©es dans le maintien de la production dâATP et enfin, iv. des molĂ©cules participant Ă lâĂ©quilibre redox de la cellule. Ces travaux ont mis en Ă©vidence des candidats avec un fort potentiel biomarqueur, parmi lesquels : la protĂ©ine 14-3-3-Δ, la Heat Shock Protein 40, la Major Vault Protein et la phosphoĂ©nolpyruvate carboxykinase. De plus, des protĂ©oformes partielles ont Ă©tĂ© rĂ©vĂ©lĂ©es ; leur importance comme marqueur de stress a Ă©tĂ© discutĂ©e. Ce travail reprĂ©sente une Ă©tape prĂ©alable au dĂ©veloppement de nouveaux biomarqueurs. Les candidats proposĂ©s devront faire lâobjet dâune Ă©tude plus approfondie
Stress proteome in sentinel species : search for new environmental biomarkers
Les organismes aquatiques sont capables de rĂ©pondre de maniĂšre adaptative aux effets toxiques des contaminants chimiques prĂ©sents dans lâeau. LâĂ©tude qualitative de ces rĂ©ponses est encore plus cruciale dans un contexte de changements climatiques. La recherche de biomarqueurs en Ă©cotoxicologie constitue une clĂ© pour dĂ©velopper des outils pour la surveillance environnementale. Dans ce contexte, la protĂ©omique sur des espĂšces sentinelles bivalves, telles que les moules marines du genre Mytilus et les moules dulcicoles du genre Dreissena, est une approche ouverte qui amĂšne des connaissances nouvelles sur les mĂ©canismes molĂ©culaires et cellulaires mis en jeu dans les rĂ©ponses au stress. Une exploitation bioinformatique de donnĂ©es de protĂ©omique dĂ©jĂ acquises a Ă©tĂ© rĂ©alisĂ©e en utilisant les rĂ©sultats issus dâune sĂ©rie dâexpĂ©riences de stress chimiques et/ou thermiques. La stratĂ©gie a Ă©tĂ© de recribler et croiser les donnĂ©es acquises afin de recenser les protĂ©ines impliquĂ©es de façon rĂ©currente. Ce travail a Ă©tĂ© complĂ©tĂ© par une analyse bibliographique qui a amenĂ© une sĂ©lection de candidats. De façon attendue, ont Ă©tĂ© mis en avant i. lâimplication des protĂ©ines chaperonnes intervenant dans le recyclage, le repliement et le maintien des conformations des protĂ©ines, ii. des acteurs associĂ©s Ă la dynamique du cytosquelette, iii. des enzymes impliquĂ©es dans le maintien de la production dâATP et enfin, iv. des molĂ©cules participant Ă lâĂ©quilibre redox de la cellule. Ces travaux ont mis en Ă©vidence des candidats avec un fort potentiel biomarqueur, parmi lesquels : la protĂ©ine 14-3-3-Δ, la Heat Shock Protein 40, la Major Vault Protein et la phosphoĂ©nolpyruvate carboxykinase. De plus, des protĂ©oformes partielles ont Ă©tĂ© rĂ©vĂ©lĂ©es ; leur importance comme marqueur de stress a Ă©tĂ© discutĂ©e. Ce travail reprĂ©sente une Ă©tape prĂ©alable au dĂ©veloppement de nouveaux biomarqueurs. Les candidats proposĂ©s devront faire lâobjet dâune Ă©tude plus approfondie.Aquatic organisms are able to adapt to the toxic effects of chemical contaminants in the water. The qualitative study of these responses is even more crucial in a climate change context. The search for biomarkers in ecotoxicology is key to developing tools for environmental monitoring. In this context, proteomics on sentinel bivalve species, such as marine mussels (genus: Mytilus) and freshwater mussels (genus: Dreissena), represent an open approach providing new knowledge on the molecular and cellular mechanisms involved in stress responses. A bioinformatic exploitation of previously acquired proteomic data was performed using results from a series of chemical and/or thermal stress experiments. The strategy was to recombine and cross-reference the acquired data in order to identify recurrent proteins. This work was completed by a literature review which led to a selection of candidates. As expected, i. chaperone proteins involved in the recycling, folding and maintenance of protein conformations, ii. cytoskeleton dynamics facilitators, iii. enzymes involved in the maintenance of ATP production and finally, iv. proteins involved in the cell redox balance were in the forefront. This work has highlighted candidates with a strong biomarker potential, e.g.: 14-3-3-Δ Protein, Heat Shock Protein 40, Major Vault Protein and Phosphoenolpyruvate carboxykinase. In addition, partial proteoforms were revealed; their importance as stress markers was discussed. This work represents a preliminary step for developing new biomarkers, therefore, the proposed candidates will need further study before field application
New Insights into Cellular Impacts of Metals in Aquatic Animals
International audienceToxic metals remain a current important threat to aquatic ecosystems, despite regulatory efforts to reduce their release. Several toxic metals already appear in the list of priority substances polluting surface waters, while concerns arise from the increasing use of technology-critical metals such as metallic nanoparticles, rare-earth, and platinum group metals. In aquatic environments, various chemical, biological and physical processes determine the impact of metals on the biota. This review provides insights into responses to toxic metals recently reported in freshwater and marine animals. The specific emphasis is on: (i) common cellular and molecular responses; (ii) stress proteins; (iii) redox homeostasis; (iv) cytoskeleton rearrangement; (v) metabolism reshuffle; (vi) free cellular energy and mitochondrial metabolism; and (vi) immunity. These endpoints are promising, notably in multi-biomarker approaches to identify precise cellular toxicity pathways and anticipate the impact of environmental metal pollution
Mise en évidence de protéines révélant une réponse au stress adaptative divergente entre les espÚces Dreissena polymorpha et Dreissena rostriformis bugensis
International audienceZebra mussels Dreissena polymorpha, are bivalve molluscs used in ecotoxicology, as a sentinel species with, among other things, a strong bioaccumulation capacity. The quagga mussel, Dreissena rostriformis bugensis, has more recently colonized Western Europe. Also invasive, it competes with zebra mussels for habitats and, in some areas, has completely replaced it. Its use as a sentinel species is envisaged but requires understanding the mechanisms involved during the adaptive stress response and comparing them to those of the zebra mussel, which are better characterized. With this in mind, an exposure of the two species to a classical contaminant was performed to compare their responses. The individuals were exposed to a concentration of 100 ÎŒg / L of cadmium for 7 days, and then the gill proteins were separated by two-dimensional electrophoresis and the variable abundance proteoforms were identified by mass spectrometry. The functional analysis reveals promising elements for the study of the adaptive response in both species. A difference of expression of actors of the energy metabolism pathways points a physiological difference, with a reallocation of energy as well as the appearance of truncated proteins.Les moules zĂ©brĂ©es, Dreissena polymorpha sont des mollusques bivalves utilisĂ©s en Ă©cotoxicologie comme espĂšces sentinelles du fait, entre autre, de leur capacitĂ© de bioaccumulation. La moule quagga, Dreissena rostriformis bugensis, a colonisĂ© plus rĂ©cemment l'Europe occidentale. Egalement invasive, elle est en compĂ©tition avec la moule zĂ©brĂ©e pour les habitats et, dans certaines zones, l'a complĂštement remplacĂ©e. Son utilisation en tant qu'espĂšce sentinelle est envisagĂ©e mais nĂ©cessite de comprendre les mĂ©canismes mis en jeu au cours de la rĂ©ponse adaptative au stress et de les comparer Ă ceux de la moule zĂ©brĂ©e, mieux caractĂ©risĂ©s. Dans cette optique, une exposition des deux espĂšces Ă un contaminant classique a Ă©tĂ© rĂ©alisĂ©e afin de comparer leurs rĂ©ponses. Les individus ont Ă©tĂ© exposĂ©s Ă une concentration de 100ÎŒg/L de cadmium pendant 7 jours, puis les protĂ©ines des branchies ont Ă©tĂ© sĂ©parĂ©es par Ă©lectrophorĂšse bidimensionnelle et les protĂ©oformes d'abondance variable ont Ă©tĂ© identifiĂ©es par spectromĂ©trie de masse. L'analyse fonctionnelle rĂ©vĂšle des Ă©lĂ©ments prometteurs pour l'Ă©tude de la rĂ©ponse adaptative chez les deux espĂšces. Une diffĂ©rence d'expression d'acteurs des voies du mĂ©tabolisme Ă©nergĂ©tique pointe une diffĂ©rence physiologique, avec une rĂ©allocation de l'Ă©nergie ainsi que l'apparition de protĂ©ines tronquĂ©es
Mise en évidence de protéines révélant une réponse au stress adaptative divergente entre les espÚces Dreissena polymorpha et Dreissena rostriformis bugensis
International audienceZebra mussels Dreissena polymorpha, are bivalve molluscs used in ecotoxicology, as a sentinel species with, among other things, a strong bioaccumulation capacity. The quagga mussel, Dreissena rostriformis bugensis, has more recently colonized Western Europe. Also invasive, it competes with zebra mussels for habitats and, in some areas, has completely replaced it. Its use as a sentinel species is envisaged but requires understanding the mechanisms involved during the adaptive stress response and comparing them to those of the zebra mussel, which are better characterized. With this in mind, an exposure of the two species to a classical contaminant was performed to compare their responses. The individuals were exposed to a concentration of 100 ÎŒg / L of cadmium for 7 days, and then the gill proteins were separated by two-dimensional electrophoresis and the variable abundance proteoforms were identified by mass spectrometry. The functional analysis reveals promising elements for the study of the adaptive response in both species. A difference of expression of actors of the energy metabolism pathways points a physiological difference, with a reallocation of energy as well as the appearance of truncated proteins.Les moules zĂ©brĂ©es, Dreissena polymorpha sont des mollusques bivalves utilisĂ©s en Ă©cotoxicologie comme espĂšces sentinelles du fait, entre autre, de leur capacitĂ© de bioaccumulation. La moule quagga, Dreissena rostriformis bugensis, a colonisĂ© plus rĂ©cemment l'Europe occidentale. Egalement invasive, elle est en compĂ©tition avec la moule zĂ©brĂ©e pour les habitats et, dans certaines zones, l'a complĂštement remplacĂ©e. Son utilisation en tant qu'espĂšce sentinelle est envisagĂ©e mais nĂ©cessite de comprendre les mĂ©canismes mis en jeu au cours de la rĂ©ponse adaptative au stress et de les comparer Ă ceux de la moule zĂ©brĂ©e, mieux caractĂ©risĂ©s. Dans cette optique, une exposition des deux espĂšces Ă un contaminant classique a Ă©tĂ© rĂ©alisĂ©e afin de comparer leurs rĂ©ponses. Les individus ont Ă©tĂ© exposĂ©s Ă une concentration de 100ÎŒg/L de cadmium pendant 7 jours, puis les protĂ©ines des branchies ont Ă©tĂ© sĂ©parĂ©es par Ă©lectrophorĂšse bidimensionnelle et les protĂ©oformes d'abondance variable ont Ă©tĂ© identifiĂ©es par spectromĂ©trie de masse. L'analyse fonctionnelle rĂ©vĂšle des Ă©lĂ©ments prometteurs pour l'Ă©tude de la rĂ©ponse adaptative chez les deux espĂšces. Une diffĂ©rence d'expression d'acteurs des voies du mĂ©tabolisme Ă©nergĂ©tique pointe une diffĂ©rence physiologique, avec une rĂ©allocation de l'Ă©nergie ainsi que l'apparition de protĂ©ines tronquĂ©es
Cadmium Highlights Common and Specific Responses of Two Freshwater Sentinel Species, <i>Dreissena polymorpha</i> and <i>Dreissena rostriformis bugensis</i>
Zebra mussel (ZM), Dreissena polymorpha, commonly used as a sentinel species in freshwater biomonitoring, is now in competition for habitat with quagga mussel (QM), Dreissena rostriformis bugensis. This raises the question of the quagga musselâs use in environmental survey. To better characterise QM response to stress compared with ZM, both species were exposed to cadmium (100 ”g·Lâ1), a classic pollutant, for 7 days under controlled conditions. The gill proteomes were analysed using two-dimensional electrophoresis coupled with mass spectrometry. For ZM, 81 out of 88 proteoforms of variable abundance were identified using mass spectrometry, and for QM, 105 out of 134. Interestingly, the proteomic response amplitude varied drastically, with 5.6% of proteoforms of variable abundance (DAPs) in ZM versus 9.4% in QM. QM also exhibited greater cadmium accumulation. Only 12 common DAPs were observed. Several short proteoforms were detected, suggesting proteolysis. Functional analysis is consistent with the pleiotropic effects of the toxic metal ion cadmium, with alterations in sulphur and glutathione metabolisms, cellular calcium signalling, cytoskeletal dynamics, energy production, chaperone activation, and membrane events with numerous proteins involved in trafficking and endocytosis/exocytosis processes. Beyond common responses, the sister species display distinct reactions, with cellular response to stress being the main category involved in ZM as opposed to calcium and cytoskeleton alterations in QM. Moreover, QM exhibited greater evidence of proteolysis and cell death. Overall, these results suggest that QM has a weaker stress response capacity than ZM