Evaluation of the developmental toxicities of coumarin, 4-hydroxycoumarin, and 7-hydroxycoumarin using FETAX

Drug and Chemical Toxicology
D J FortJ A Bantle

Abstract

The developmental toxicities of coumarin and hydroxycoumarin metabolites were evaluated using FETAX. Young X. laevis embryos were exposed to coumarin, 4-hydroxycoumarin, and 7-hydroxycoumarin in each of two separate concentration-response experiments with and without an exogenous metabolic activation system (MAS) and/or inhibited MAS. The MAS was treated with carbon monoxide (CO), cimetidine (CIM), or ellipticine (ELL) to selectively modulate cytochrome P-450 activity. The MAS was also treated with cyclohexene oxide (CHO) to selectively modulate epoxide hydrolase activity. Without the MAS or inhibited MAS, coumarin and 7-hydroxycoumarin were nearly equitoxic, whereas 4-hydroxycoumarin was nearly 2-fold less developmentally toxic than coumarin on an equimolar basis. Addition of the MAS and CIM-MAS increased the developmental toxicities of coumarin and, particularly, 4-hydroxycoumarin. Addition of the CHO-MAS greatly increased the developmental toxicity of coumarin and, especially, 4-hydroxycoumarin. Addition of the ELL- or CO-inhibited MAS did not increase the developmental toxicity of coumarin. However, addition of the intact MAS did not alter the developmental toxicity of 7-hydroxycoumarin. Results from these studies suggested...Continue Reading

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Citations

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