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1744199 
Technical Report 
Free Radical Mechanisms of Xenobiotic Mammalian Cytotoxicities 
Dickens, BF 
1991 
NTIS/02978478_a 
GRA and I 
GRA and I 
Our initial goal was to identify if free radical mechanisms are involved in the cytotoxicity of a number of IRP volume I and II chemicals. We found that a number of these agents act to enhance membrane lipid peroxidation in response to a standard dose of exogenous free radicals. Using chlorinated hydrocarbons (carbon tetrachloride, trichloroethylene, dichloroethylene, trichloroethane, dichloroethane) as a model for other IRP chemicals, we established conditions to measure lipid peroxidation in cultured smooth muscle and endothelial cells. These agents induced lipid peroxidation in the presence of physiological levels of iron in these vascular cells by a mechanism that doesn't require cytochrome P-450. Antiradical treatment with deferoxamine and probucol (but not SOD, catalase, or mannitol) appear to reduce the toxicity of these agents. 
Free radicals; Carbon tetrachloride; Cardiovascular system; Catalase; Cells; Cells(Biology); Chemicals; Chlorinated hydrocarbons; Chloroethanes; Dosage; Endothelium; Iron; Lipids; Mannitol; Measurement; Membranes(Biology); Muscles; Oxidation; Physiology; Toxicity; Trichloroethanes; Trichloroethylene; Volume; Xenobiotics; IRP Volume I and II chemicals; Cytotoxicity membrane lipid peroxidation; Spin trapping; ESR; Cell culture; Endothelial cell; Smooth muscle cell; Cell survival; Lipid peroxidation