Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1021/acs.chemrestox.1c00182
Volltext Akzeptiertes Manuskript
Titel (primär) Critical membrane concentration and mass-balance model to identify baseline cytotoxicity of hydrophobic and ionizable organic chemicals in mammalian cell lines
Autor Lee, J.; Braun, G.; Henneberger, L.; König, M.; Schlichting, R.; Scholz, S. ORCID logo ; Escher, B.I.
Quelle Chemical Research in Toxicology
Erscheinungsjahr 2021
Department BIOTOX; ZELLTOX
Band/Volume 34
Heft 9
Seite von 2100
Seite bis 2109
Sprache englisch
Topic T9 Healthy Planet
Supplements https://pubs.acs.org/doi/suppl/10.1021/acs.chemrestox.1c00182/suppl_file/tx1c00182_si_001.pdf
https://pubs.acs.org/doi/suppl/10.1021/acs.chemrestox.1c00182/suppl_file/tx1c00182_si_002.xlsx
Abstract All chemicals can interfere with cellular membranes and this leads to baseline toxicity, which is the minimal toxicity any chemical elicits. The critical membrane burden is constant for all chemicals; that is, the dosing concentrations to trigger baseline toxicity decrease with increasing hydrophobicity of the chemicals. Quantitative structure–activity relationships, based on hydrophobicity of chemicals, have been established to predict nominal concentrations causing baseline toxicity in human and mammalian cell lines. However, their applicability is limited to hydrophilic neutral compounds. To develop a prediction model that includes more hydrophobic and charged organic chemicals, a mass balance model was applied for mammalian cells (AREc32, AhR-CALUX, PPARγ-BLA, and SH-SY5Y) considering different bioassay conditions. The critical membrane burden for baseline toxicity was converted into nominal concentration causing 10% cytotoxicity by baseline toxicity (IC10,baseline) using a mass balance model whose main chemical input parameter was the liposome-water partition constants (Klip/w) for neutral chemicals or the speciation-corrected Dlip/w(pH 7.4) for ionizable chemicals plus the bioassay-specific protein, lipid, and water contents of cells and media. In these bioassay-specific models, log(1/IC10,baseline) increased with increasing hydrophobicity, and the relationship started to level off at log Dlip/w around 2. The bioassay-specific models were applied to 392 chemicals covering a broad range of hydrophobicity and speciation. Comparing the predicted IC10,baseline and experimental cytotoxicity IC10, known baseline toxicants and many additional chemicals were identified as baseline toxicants, while the others were classified based on specificity of their modes of action in the four cell lines, confirming excess toxicity of some fungicides, antibiotics, and uncouplers. Given the similarity of the bioassay-specific models, we propose a generalized baseline-model for adherent human cell lines: log[1/IC10,baseline (M)] = 1.23 + 4.97 × (1 – e–0.236 log Dlip/w). The derived models for baseline toxicity may serve for specificity analysis in reporter gene and neurotoxicity assays as well as for planning the dosing for cell-based assays.
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=25210
Lee, J., Braun, G., Henneberger, L., König, M., Schlichting, R., Scholz, S., Escher, B.I. (2021):
Critical membrane concentration and mass-balance model to identify baseline cytotoxicity of hydrophobic and ionizable organic chemicals in mammalian cell lines
Chem. Res. Toxicol. 34 (9), 2100 - 2109 10.1021/acs.chemrestox.1c00182