title: Stepwise discrimination between four modes of toxic action of phenols in the Tetrahymena pyriformis assay.
abstract: For a set of 220 phenols with literature data on their toxicity and associated mode of action (MOA) toward the ciliate Tetrahymena pyriformis, a stepwise classification scheme was developed that allows the identification of four MOAs from molecular hydrophobicity and AM1-based quantum chemical descriptors, employing linear discriminant analysis or binary logistic regression. Taking the AM1 lowest unoccupied molecular orbital energy as the only parameter, an initial separation of polar narcotics and proelectrophiles from oxidative uncouplers and soft electrophiles is correct to 97%, and for the subsequent discrimination between polar narcotics and proelectrophiles as well as between oxidative uncouplers and soft electrophiles, 99 and 98% correct classifications are achieved using three and two molecular descriptors, respectively. The results are discussed in terms of detailed contingency table statistics and with respect to relationships between molecular descriptors and mechanisms of toxicity. Statistical model evaluation includes simulated external validation employing complementary subset models.
authors.affiliation: Department of Chemical Ecotoxicology, UFZ Centre for Environmental Research, Permoserstrasse 15, 04318 Leipzig, Germany.
authors.forename: Gerrit
authors.initials: G
authors.lastname: Schüürmann
authors.forename: Aynur O
authors.initials: AO
authors.lastname: Aptula
authors.forename: Ralph
authors.initials: R
authors.lastname: Kühne
authors.forename: Ralf-Uwe
authors.initials: RU
authors.lastname: Ebert
mesh_terms: D000818:Animals; D004563:Electrochemistry; D057927:Hydrophobic and Hydrophilic Interactions; D016014:Linear Models; D016015:Logistic Models; D009294:Narcotics / Q000633:toxicity; D010084:Oxidation-Reduction; D010636:Phenols / Q000145:classification* / Q000633:toxicity*; D021281:Quantitative Structure-Activity Relationship; D011789:Quantum Theory; D013769:Tetrahymena pyriformis / Q000187:drug effects*
chemical_list: D009294:Narcotics; D010636:Phenols