Subchronic toxicity of ethylene glycol in Wistar and F-344 rats related to metabolism and clearance of metabolites

Toxicological Sciences : an Official Journal of the Society of Toxicology
George CruzanJames A Deyo

Abstract

Ethylene glycol (CAS RN 107-21-1) can cause kidney toxicity via the formation of calcium oxalate crystals in a variety of species, including humans. Numerous repeated dose studies conducted in rats have indicated that male rats are more susceptible than female rats. Furthermore, subchronic and chronic studies using different dietary exposure regimens have indicated that male Wistar rats may be more sensitive to renal toxicity than male Fischer-344 (F-344) rats. This study was conducted to compare the toxicity of ethylene glycol in the two strains of rats under identical exposure conditions and to evaluate the potential contribution of toxicokinetic differences to strain sensitivity. Ethylene glycol was mixed in the diet at concentrations to deliver constant target dosage levels of 0, 50, 150, 500, or 1000 mg/kg/day for 16 weeks to groups of 10 male Wistar and 10 male F-344 rats based on weekly group mean body weights and feed consumption. Kidneys were examined histologically for calcium oxalate crystals and pathology. Samples of blood, urine, and kidneys from satellite animals exposed to 0, 150, 500, or 1000 mg/kg/day for 1 or 16 weeks were analyzed for ethylene glycol, glycolic acid, and oxalic acid. Treatment of Wistar rats a...Continue Reading

Citations

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