The aim of the study is to identify effects caused by endocrine modulation in fish and evaluate these with respect to dysfunction in sex differentiation, development of functional organs as well as fecundity. Another aspect is the determination of the […]
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 […]
The project will provide information on effective in vitro (T-screen & Keratonisation Assay) and in vivo assays (metamorphosis, migration and prolonged FETAX-assay) for alterations of thyroid and retinoid dependent processes. It will bridge the gap between the in vitro and […]
The effects of so-called ”endocrine disruptors” (EDs), i.e. hormone-like acting substances of natural or anthropogenic origin or compounds disturbing the endocrine system by other mechanisms, on reproduction are subject to extensive discussion worldwide. For better identification of such effects, regulatory […]
Discussions over possible declines in male sperm counts are hampered by the lack of human data. Data is readily available, however, on sperm counts from other mammals, and this can provide helpful insight to questions regarding male fertility rates. This […]
The study will investigate sex steroid-regulated gene expression in two sexually dimorphic brain regions i.e. the preoptic region, the bed nucleus of stria terminalis and the ventromedial hypothalamic nucleus, which are part of the neural network controlling sexually dimorphic behaviours […]
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 […]
The aim of the study was to study neuro-endocrine regulation, particularly the brain-pituitary-gonad (BPG) axis, 3 freshwater fish species (catfish, trout and tilapia) exposed to 4-nonyl phenol (4-NP) or oestradiol (EE). The research also sought to establish an immortalised gonadotroph […]
An in vivo screening test for oestrogenicity was developed jointly by three laboratories by measuring vitellogenin in fathead minnows after up to 21 days exposure. This method will be further refined by determination of (anti-)androgens and aromatase inhibitors in the […]
The objective of this project was the evaluation and validation of the Hershberger assay as part of the official OECD validation of this test method. This test, developed under the EDTA programme, is designed to help detect chemicals interfering with […]
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