Two‐year toxicity and carcinogenicity study of acrolein in rats
Abstract
Five‐hundred and sixty Sprague‐Dawley rats were randomized into one control and three treatment groups (70 of each sex per group). Animals were treated by daiiy gavage with 0.0, 0.05, 0.5 and 2.5 mg kg−1 acrokin in water (10 ml kg−1). These dosing levels were selected as a result ofa 6‐week range‐finding study. Ten rats of each sex per group were sacrificed at 1 year, and the remainder of the animals were treated for 102 weeks. Daily observations were made, and various clinical, hematological and urine parameters were measured after 3, 6, 12 and 18 months of treatment and immediately prior to termination. All animals, whether found dead or sacrificed, were subject to necropsy and both absolute and relative organ weights were recorded. An extensive array of tissues were examined microscopically for all test animals.
The only effects noted for treated rats that were statistically different from controls were consistent depression of creatinine phosphokinase levels, which was difficult to explain, and consistent increases in early cumulative mortalities in both males and females. There was no significantly increased incidence of microscopic lesions in treated rats, whether neoplastic or non‐neoplastic. This study clearly demonstrates the lack of neoplastic response in Sprague‐Dawley rats as a result of being treated with acrolein by gavage.
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