Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1016/j.chemosphere.2016.08.079
Titel (primär) Development of a general baseline toxicity QSAR model for the fish embryo acute toxicity test
Autor Klüver, N.; Vogs, C.; Altenburger, R.; Escher, B.I.; Scholz, S.
Journal / Serie Chemosphere
Erscheinungsjahr 2016
Band/Volume 164
Seite von 164
Seite bis 173
Sprache englisch
Keywords Zebrafish embryo; FET; Toxicity baseline QSAR; Liposome-water partition coefficient; Internal lethal concentration; Chemical activity
UFZ Querschnittsthemen RU3;
Abstract Fish embryos have become a popular model in ecotoxicology and toxicology. The fish embryo acute toxicity test (FET) with the zebrafish embryo was recently adopted by the OECD as technical guideline TG 236 and a large database of concentrations causing 50% lethality (LC50) is available in the literature. Quantitative Structure-Activity Relationships (QSARs) of baseline toxicity (also called narcosis) are helpful to estimate the minimum toxicity of chemicals to be tested and to identify excess toxicity in existing data sets. Here, we analyzed an existing fish embryo toxicity database and established a QSAR for fish embryo LC50 using chemicals that were independently classified to act according to the non-specific mode of action of baseline toxicity. The octanol-water partition coefficient Kow is commonly applied to discriminate between non-polar and polar narcotics. Replacing the Kow by the liposome-water partition coefficient Klipw yielded a common QSAR for polar and non-polar baseline toxicants. This developed baseline toxicity QSAR was applied to compare the final mode of action (MOA) assignment of 132 chemicals. Further, we included the analysis of internal lethal concentration (ILC50) and chemical activity (La50) as complementary approaches to evaluate the robustness of the FET baseline toxicity. The analysis of the FET dataset revealed that specifically acting and reactive chemicals converged towards the baseline toxicity QSAR with increasing hydrophobicity. The developed FET baseline toxicity QSAR can be used to identify specifically acting or reactive compounds by determination of the toxic ratio and in combination with appropriate endpoints to infer the MOA for chemicals.
dauerhafte UFZ-Verlinkung
Klüver, N., Vogs, C., Altenburger, R., Escher, B.I., Scholz, S. (2016):
Development of a general baseline toxicity QSAR model for the fish embryo acute toxicity test
Chemosphere 164 , 164 - 173