title: Bioanalytical characterisation of multiple endocrine- and dioxin-like activities in sediments from reference and impacted small rivers.
abstract: A comprehensive evaluation of organic contamination was performed in sediments sampled in two reference and three impacted small streams where endocrine disruptive (ED) effects in fish have been evidenced. The approach combined quantitative chemical analyses of more than 50 ED chemicals (EDCs) and a battery of in vitro bioassays allowing the quantification of receptor-mediated activities, namely estrogen (ER), androgen (AR), dioxin (AhR) and pregnane X (PXR) receptors. At the most impacted sites, chemical analyses showed the presence of natural estrogens, organochlorine pesticides, parabens, polycyclic aromatic hydrocarbons (16 PAHs), bisphenol A and alkylphenols, while synthetic steroids, myco-estrogens and phyto-estrogens were not detected. Determination of toxic-equivalent amounts showed that 28-96% of estrogenic activities in bioassays (0.2-6.3 ng/g 17beta-estradiol equivalents) were explained by 17beta-estradiol and estrone. PAHs were major contributors (20-60%) to the total dioxin-like activities. Interestingly, high PXR and (anti)AR activities were detected; however, the targeted analysed compounds could not explain the measured biological activities. This study highlighted the presence of multiple organic EDCs in French river sediments subjected to mixed diffuse pollution, and argues for the need to further identify AR and PXR active compounds in the aquatic environment.
authors.affiliation: Unité d'Ecotoxicologie, Institut National de l'Environnement Industriel et des Risques, BP2, F-60550 Verneuil en Halatte, France.
authors.forename: Said
authors.initials: S
authors.lastname: Kinani
authors.forename: Stéphane
authors.initials: S
authors.lastname: Bouchonnet
authors.forename: Nicolas
authors.initials: N
authors.lastname: Creusot
authors.forename: Sophie
authors.initials: S
authors.lastname: Bourcier
authors.forename: Patrick
authors.initials: P
authors.lastname: Balaguer
authors.forename: Jean-Marc
authors.initials: JM
authors.lastname: Porcher
authors.forename: Sélim
authors.initials: S
authors.lastname: Aït-Aïssa
mesh_terms: D001681:Biological Assay / Q000379:methods*; D004147:Dioxins / Q000032:analysis* / Q000378:metabolism; D052244:Endocrine Disruptors / Q000032:analysis* / Q000378:metabolism; D004784:Environmental Monitoring / Q000379:methods*; D019015:Geologic Sediments / Q000032:analysis*; D000077297:Pregnane X Receptor; D011944:Receptors, Androgen / Q000378:metabolism; D018336:Receptors, Aryl Hydrocarbon / Q000378:metabolism; D011960:Receptors, Estrogen / Q000378:metabolism; D011987:Receptors, Steroid / Q000378:metabolism; D045483:Rivers; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000378:metabolism
chemical_list: D004147:Dioxins; D052244:Endocrine Disruptors; D000077297:Pregnane X Receptor; D011944:Receptors, Androgen; D018336:Receptors, Aryl Hydrocarbon; D011960:Receptors, Estrogen; D011987:Receptors, Steroid; D014874:Water Pollutants, Chemical