Allylisopropylacetamide (AIA) and isopropylvaleramide (IVA) have been demonstrated previously to protect in vivo against the acute toxicity and adrenal necrotic effect of 7,12-dimethylbenz(a)anthracene. In the present study, the influence of these two amides on the in vitro transforming ability of two potent carcinogens, benzo(a)pyrene [B(a)P] and 7,12-dimethylbenz(a)anthracene, on C3H10T½ cells was investigated. Both AIA and IVA showed a dose-dependent inhibition of B(a)P-induced transformation of C3H10T½ cells when added simultaneously for 24 hr with the carcinogen. While pretreatment, simultaneous treatment, and posttreatment of the cells with AIA or IVA inhibited transformation, the 24-hr posttreatment was somewhat more effective. The protective effect did not appear to result from alterations in B(a)P metabolism inasmuch as aryl hydrocarbon hydroxylase activity and the metabolic products of B(a)P detected by high-pressure liquid chromatography were not changed by AIA or IVA treatment. Furthermore, AIA and IVA did not selectively kill chemically transformed C3H10T½ cells, as indicated by the absence of their effect on an established, chemically transformed cell line. AIA and IVA also inhibited 7,12-dimethylbenz(a)-anthracene-induced transformation of C3H10T½ cells. These data suggest that AIA and IVA may be useful protective agents and that they presumably exert their protective effect at some stage between the activation of the carcinogen and the expression of the transformed phenotype.

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Supported in part by USPHS Contract NO 43-68-959 from the National Cancer Institute, NIH.

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