Abstract

Seventeen triterpenes isolated from cacti and the 10 derivatives were examined for the inhibition of tumor promoter-induced effects in vitro, such as stimulation of 32Pi-incorporation into phospholipids of cultured cells. Betulinic acid (1), cochalic acid (15), erythrodiol (16), oleanolic acid (21) and queretaroic acid (24) inhibited 12-O-tetradecanoylphorbol-13-acetate (TPA) stimulated 32Pi-incorporation into phospholipids of the cultured cells.

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