The project proposed is driven by the hypothesis that hepatotoxicity may positively or negatively interfere with vitellogenin production, which is used as a key marker of endocrine activity in current OECD test guidelines 229, 230 and 234 and the proposed […]
This project builds on (i) the lessons learned from the recently completed work on methodologic issues affecting epidemiologic research on BPA and (ii) the findings of the project (conducted under Cefic-LRI EMSG54) related to the importance of harmonization of epidemiologic methods for […]
Considering the available definitions of endocrine disrupting compounds (Weybridge, 1996 and WHO/IPCS, 2002) it is recommended to follow an appropriate experimental design, duration of exposure, and completeness of relevant endpoints (OECD, 2002). As expected human exposures to chemicals, pesticides, biocides, […]
The objectives of this project ar the following: Literature search on biological variability and evaluation with regard to organ weights, cylcicity, sperm parameters Drafting of pre- and main study for the assessment of biological variability
Recently evidence evolved that environmental compounds can interfere with the endocrine systems of wildlife and humans. Surface waters are suggested to be the main sink for these so called endocrine disruptors (ED). Therefore aquatic species seem to be the main […]
The specific objectives of the project are: - Development of a ”Threshold of Toxicological Concern (TTC)” concept for ecotoxicology that is analogous to the mammalian approach. Potency, environmental fate and exposure to a substance should be considered to establish environmental […]
In a 21-day-assay (phase 1 B), sexually mature female and male fathead minnows (Pimephales promelas) were exposed to a weak estrogen agonist, or a weak aromatase inhibitor, under flow-through conditions. Three different test-compound concentrations, a water-only control, and a corresponding positive control […]
The mammalian brain and pituitary gland (hypophysis) are clearly target organs for steroid and thyroid hormone action. There is also evidence that prenatal (in utero) or neonatal (young) exposure to high concentrations of some chemicals can affect the developing nervous […]
Concerns that toxicological test guidelines may not optimally detect effects on the endocrine system have lead to proposals to enhance the current sub-acute rodent OECD Test Guideline No. 407 (OECD 1995). The efficacy of the modified enhanced (phase 2) protocol […]
The study investigated whether leiomyomas in grey seals, collected during the period of decreased levels of organo-chlorines, were in a regressive phase; and whether the period of increased levels of organo-chlorines caused the leiomyomas to proliferate. In addition, in vitro […]
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