Woods Hole Oceanographic Institution

Tim Verslycke

»Copepod diapause
»Lobster Shell Disease
»Crustacean molting receptor
»Lobster Shell Disease
»Mysids as test models for endocrine disruption testing
»Chlorotriazines in the Scheldt estuary
»Energy allocation in grasshopper
»Estrogens in Scheldt estuary
»Marsupial development in mysids to evaluate endocrine disruption
»B[a]P effects on steroid metabolism in mysid
»Ciona CYP3 genes
»Methoprene, nonylphenol, and estrone effects on mysid vitellogenesis
»Methoprene effects on mysid molting
»Mysid growth
»Mysid vitellin ELISA
»Mysid vitellin
»An analytical method to detect estrogens in water
»High levels of endocrine disruptors in wild mysid populations
»Energy allocation in wild mysid populations
»Cellular energy allocation validation with scope for growth
»Dolphin delivery prediction
»PhD thesis
»Endocrine disruptor effects on steroid and energy metabolism in mysid
»Mysid review
»TBT effects on steroid metabolism in mysid
»Metal mixture toxicity to mysid
»TBT effects on energy metabolism in mysid
»dichlorobenzene effects in zebrafish
»Ethinylestradiol effects on amphipod sexual development
»Metabolic studies with mysids
»Abiotic stress and energy metabolism in mysid
»Induced vitellogenesis in rainbow trout
»Steroid metabolism in mysid
»Endocrine disruption in freshwater snails
»Invasive mysid in Belgium

Tim Verslycke, Katia De Wasch, Hubert F. De Brabander, Colin R. Janssen, Testosterone metabolism in the estuarine invertebrate Neomysis integer (Crustacea: Mysidacea): Identification of testosterone metabolites and endogenous vertebrate-type steroids, General and Comparative Endocrinology 126: 190-199, 2002

Testosterone metabolism by Neomysis integer (Crustacea,Mysidacea) was assessed to obtain initial data on its metabolic capacity. N. integer were exposed to both testosterone and [14C]testosterone. Identification of testosterone metabolites and endogenous steroids was performed using thin layer chromatography and liquid chromatography with multiple mass spectrometry. Endogenous production of testosterone in mysids was detected for the first time. N. integer were exposed to testosterone and metabolized administered testosterone extensively. At least 11 polar testosterone metabolites (Rf,metabolite < Rf,testosterone), androstenedione, dihydrotestosterone, and testosterone were produced in vivo by N. integer. A sex-specific testosterone metabolism was also observed, although this observation requires further confirmation. The anabolic steroid ß-boldenone was also identified for the first time in invertebrates. The metabolic pathway leading to the formation of ß-boldenone remains unknown, since the steroidal precursor androstadienedione could not be detected. These results reveal interesting similarities in enzyme systems in invertebrate and vertebrate species. Alterations in steroid hormone metabolism may be used as a new biomarker for the effects of endocrine disruptors in invertebrates.doi:10.1006/gcen.2002.7793

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