Four known friedelane-type triterpenoids, friedelin (1), 3-hydroxy-D:A-friedoolean-3-en-2-one (2), 2β-hydroxy-D:A-friedooleanan-3-one (3), and 3α-hydroxy-D:A-friedooleanan-2-one (4), and two known lupane-type triterpenoids, lupeol (5) and betulin (6), were isolated from the stem bark of Mallotus philippensis. Isolates 1 - 4 and their synthetic analogues, 3-acetoxy-D:A-friedoolean-3-en-2-one (2a) and 3α-acetoxy-D:A-friedooleanan-2-one (4a), were tested for their inhibitory effects on Epstein-Barr virus early antigen (EBV-EA) activation induced by 12-O-tetradecanoylphorbol 13-acetate (TPA). The inhibitory effect of compounds 2 (IC50 = 292 mol ratio/32 pmol/TPA) and 4 (IC50 = 288) was stronger than those of the other compounds tested and the positive control, curcumin (IC50 = 343). Compound 4 strongly inhibited mouse skin tumor promotion in an in vivo two-stage carcinogenesis model. Studies have been conducted to identify the biologically active compounds extracted from the leaves, bark, and cones of trees that currently have no specific commercial use and are therefore treated as waste in the forestry industry.
从
菲利蒲桃(Mallotus philippensis)的茎皮中分离出了四种已知的油炸
榄香烯类三萜,即油炸
榄香烯(1)、3-羟基-D:A-油炸
榄香烯-3-烯-2-酮(2)、2δ-羟基-D:A-油炸
榄香烯-3-酮(3)和3±-羟基-D:A-油炸
榄香烯-2-酮(4),以及两种已知的
羽扇豆类三萜,即
羽扇豆醇(5)和白桦脂素(6)。测试了分离物 1 - 4 及其合成类似物 3-acetoxy-D:A-friedoolean-3-en-2-one (2a) 和 3α-acetoxy-D:A-friedoolean-2-one (4a)对 12-O-tetradecanoylphorbol 13-acetate (
TPA) 诱导的 Epstein-Barr 病毒早期抗原 (EBV-EA) 激活的抑制作用。化合物 2(IC50 = 292 mol ratio/32 pmol/
TPA)和化合物 4(IC50 = 288)的抑制作用强于其他测试化合物和阳性对照
姜黄素(IC50 = 343)。在体内两阶段致癌模型中,化合物 4 能强烈抑制小鼠皮肤肿瘤的生长。目前,从树叶、树皮和球果中提取的
生物活性化合物没有具体的商业用途,因此在林业中被作为废物处理。