Abstract
Stoddard solvent IIC is widely used as a solvent in paints and varnishes, and for dry cleaning and other grease removal applications. Because concern exists regarding the long-term effects of occupational exposure in industrial settings, the toxicity and carcinogenicity of Stoddard solvent IIC were evaluated in male and female F344/N rats and B6C3F1 mice. Rats and mice were exposed to 0, 138, 275, 550, 1100, or 2200 mg/m3 Stoddard solvent IIC by whole-body inhalation for 3 mo, and to 0, 138 (male rats), 550, 1100, or 2200 (female rats and male and female mice) mg/m3 for 2 yr. The kidney, liver, and adrenal medulla were targets of Stoddard solvent IIC toxicity in rats. After 3 mo of exposure, male rats developed lesions characteristic of alpha2u-globulin nephropathy. Male and female rats displayed increased liver weights and/or clinical pathology changes suggestive of hepatic injury, although no accompanying histopathologic changes were observed. After 2 yr, increased incidences of adrenal medullary pheochromocytomas provided some evidence of carcinogenicity in male rats. Renal tubule adenomas were slightly increased in male rats after 2 yr, and may have been related to exposure. In mice, there was no chemical-related toxicity a...Continue Reading
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