The overall goal of this project is to characterize the potential in vitro and in vivo activities of plant-derived endocrine active compounds (EACs) versus synthetic substances and to evaluate potential combinatory effects of relevance to fish reproductive health. In particular, the […]
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, […]
Growing concerns regarding the possibility that environmental contaminants could mimic estrogens and androgens and hence disrupt endocrine systems have led to the evaluation of test systems to detect such contaminants. One system, the weanling rat assay, has been suggested as […]
The current method of assessing the (anti-)androgenic potential of a compound in vivo is through the use of the Hershberger assay. This involves first castrating adult male rats, allowing the sexual accessory tissues to regress and then exposing the rats […]
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 […]
The analysis of epigenetic modifications at the level of the genome is a very promising field of research. The major question to be addressed is how the epigenome distinguishes cell types and how epigenetic variability between individuals reflects the influence […]
Masculinisation depends on adequate production of testosterone by the fetal testis within a specific'male programming window'. Disorders resulting from subtle deficiencies in this process are common in humans and environmental exposures/lifestyle could contribute causally as common therapeutic and environmental compounds […]
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 […]
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