Abstract
Two citrus limonoids, limonin and nomilin, were tested for their effects on the development of 7,12-dimethylbenz[a]anthracene (DMBA)-induced buccal pouch epidermoid carcinomas. Forty-five female Syrian hamsters were divided into three equal groups. The left buccal pouches of the animals in each group were pretreated topically with two applications of dimethylsulfoxide (DMSO) (group I), a 2.5% solution of limonin dissolved in DMSO (group II) or a 2.5% solution of nomilin dissolved in DMSO (group III). After this initial treatment, 11 hamsters from each group were selected. The left buccal pouches of these animals were painted 2 or 3 times weekly with a 0.5% solution of DMBA in mineral oil. On alternate days the pouches were painted with DMSO (I), the 2.5% solution of limonin (II) or the 2.5% solution of nomilin (III). The 12 remaining hamsters were used as controls and were painted with mineral oil and DMSO (I), mineral oil and the 2.5% solution of limonin (II), or mineral oil and the 2.5% solution of nomilin (III). After 15 weeks the hamsters were killed, the pouches were excised and the tumors were counted and measured. Tumors of variable size were common in the animals treated with DMBA. However, the animals receiving topical...Continue Reading
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