Project description:Major classes of hormone mimics that have been studied include environmental estrogens and androgens, but recent studies have also demonstrated the significant impacts of natural and synthetic progesterones in the environment. The objective of this study was to evaluate the molecular and physiological impacts of progestin, anti-progestin, and mixture exposures in the Eastern Mosquitofish (G. holbrooki). By comparison of gene expression profiles and modulated biological processes in the three groups, it was determined that mifepristone acts more as a progestin than as an anti-progestin, as has also been demonstrated in other species of fish. This work contributes to the overall knowledge of the impacts of this class of chemical contaminats on aquatic organisms, which are a sentinel species for pollutants as aquatic ecosystems often become a reservoir for anthropogenic contaminants.
Project description:This project aims to study the role played by small non-coding RNAs in the response of aquatic organisms to the presence of micropollutants in the environment. MiRNA were purified from Eels (Anguilla anguilla) sampled from two sites along the Gironde aquatic system with contrasted pollution profiles.
Project description:The aim of this mRNA expression profiling experiment was to screen for ecotoxicogenomic fingerprints in zebrafish (Danio rerio) embryos as aquatic vertebrate non-target model exposed to sublethal concentrations of 4-methyl-3-deoxy-1,9,12-trihydroxyestra-1,3,5(10)7-tetraene-6,17-dione (MDTETD) and 12β-trihydroxy-androsta-4,6-diene-3,17-dione (THADD). MDTETD and THADD both are degradation products of bile salts, which are steroid compounds from the digestive tracts of vertebrates, which enter the environment upon excretion, e.g. in manure.
