title: Development of quantitative structure-activity relationship (QSAR) models for predicting risk of exposure from carcinogens in animals.
abstract: Quantitative structure-activity relationship (QSAR) models capable of predicting acute toxicity and carcinogen potency of polychlorinated dibenzo-p-dioxin (PCDD), polychlorinated hydrocarbons, and chlorinated insecticides have been formulated. Median lethal dose (LD50) for PCDD-exposed mice correlated negatively with polarity and positively with (H acceptor x 2 chi), whereas LD50 for PCDD-exposed guinea pigs correlated with (H acceptor x density). Both (H acceptor x 2 chi) and (H acceptor x density) exhibited parabolic relationship with log P (partition coefficient). Carcinogenic potency, determined from order of magnitude (OM) values, correlated negatively with log P and positively with (length x width). Thus, a hydrophobic mechanism plays a key role in the lethal effects of PCDD in mice, whereas both hydrophobic and electronic mechanisms are involved in the lethal effects of PCDD in guinea pigs. However, the molecule's lipophilicity, length, and width may play important roles in the carcinogenic effects of chlorinated compounds.
authors.affiliation: Department of Veterinary Diagnostic Medicine, College of Veterinary Medicine, 1333 Gortner Ave., University of Minnesota, St. Paul Campus, St. Paul, Minnesota 55418, USA. singh001@maroon.tc.umn.edu
authors.forename: A K
authors.initials: AK
authors.lastname: Singh
mesh_terms: D000818:Animals; D002273:Carcinogens / Q000633:toxicity*; D006168:Guinea Pigs; D006801:Humans; D006843:Hydrocarbons, Chlorinated / Q000633:toxicity*; D007306:Insecticides / Q000633:toxicity*; D007928:Lethal Dose 50; D051379:Mice; D023421:Models, Animal; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives / Q000633:toxicity*; D021281:Quantitative Structure-Activity Relationship; D011817:Rabbits; D051381:Rats; D012044:Regression Analysis; D018570:Risk Assessment
chemical_list: D002273:Carcinogens; D006843:Hydrocarbons, Chlorinated; D007306:Insecticides; D000072317:Polychlorinated Dibenzodioxins