Goniothalamicin and annonacin: Bioactive acetogenins fromGoniothalamus giganteus (Annonaceae)

Summary Using brine shrimp lethality for activity-directed fractionation, goniothalamicin (I), a new tetrahydroxy-mono-tetrahydrofuran fatty acid -lactone (acetogenin), has been isolated from ethanolic extracts of the stem bark ofGoniothalamus giganteus Hook. f., Thomas (Annonaceae). This novel compound was found to be cytotoxic and insecticidal and inhibited the formation of crown gall tumors on potato discs. Annonacin (II), the only other reported mono-tetrahydrofuran acetogenin, was also isolated; the previously reported 9ASK (astrocytoma reversal) activity ofII was confirmed, andII is now also found to be weakly active against 3PS murine leukemia.     

Gigantecin: A novel antimitotic and cytotoxic acetogenin,with nonadjacent tetrahydrofuran rings,fromGoniothalamus giganteus (Annonaceae)

Summary Gigantecin (I), a novel tetrahydroxy-di-tetrahydrofuran fatty acid -lactone (acetogenin), was isolated from an ethanolic extract of the stem bark ofGoniothalamus giganteus Hook. f., Thomas (Annonaceae), by means of activity-directed fractionation (brine shrimp lethality test). This new compound is extremely cytotoxic to human tumor cells, inhibits crown gall tumors on potato discs, and is active in an assay designed to detect antimitotic agents (9 ASK).     

SIOC-AA-005的抗肿瘤活性研究

观察SIOC-AA-005体外及体内抗肿瘤活性，通过MTT法和集落形成法观察SIOC-AA-005在体外的抗肿瘤活性，利用^3H-标记前体掺入法检测生物大分子的合成．利用小鼠移植瘤模型观察了SIOC-AA-005在体内的抗肿瘤活性．SIOC-AA-005对人结肠腺癌HT-29细胞的IC50为18．7nmoL／L，比对人胚肺成纤维细胞HELF的IC50低1000多倍，这一结果与集落形成和细胞生长曲线结果一致．SIOC-AA-005对HT-29细胞的DNA、RNA以及蛋白质合成均有抑制作用,SIOC-AA-005在10mg／kg剂量下对小鼠Lewis肺癌的抑制率为30．5％，在5mg／kg，10mg／kg和20mg／kg剂量下对小鼠肝癌H22的抑制率分别为37．6％、40．0％、47．2％，表现出良好的剂量效应关系,SIOC-AA-005在体外、体内均显示了较好的肿癌生长抑制作用，是一个有前景的抗肿癌化合物。