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    • 4. 发明授权
    • Taccalonolide microtubule stabilizing agents
    • 塔卡诺内酯微管稳定剂
    • US06878699B1
    • 2005-04-12
    • US09979447
    • 2000-05-18
    • Thomas K. HemscheidtSusan L. Mooberry
    • Thomas K. HemscheidtSusan L. Mooberry
    • A61K31/56A61K31/58A61K31/585C07J71/00
    • C07J71/001A61K31/56A61K31/58A61K31/585C07J71/0005A61K2300/00
    • In accordance with the present invention, there have been identified extracts from a tropical plant that initiate paclitaxel-like microtubule bundling. Bioassay-directed purification yields the steroid taccalonolide A. Taccalonolide, like paclitaxel, initiates the formation of abnormal interphaes and mitotic microtubules. Cells treated with taccalonolide exhibit thick bundles of microtubules that appear to nucleate independent of the microtubule organizing center. Abnormal mitotic spindles consisting of multi-polar spindles are initiated by taccalonolide and resemble abnormal mitotic spindles found in the presence of paclitaxel. Like paclitaxel, taccalonolide causes the breakdown of the nucleus into micronuclei. Taccalonolide causes G2/M arrest, Bc1-2 phosphorylation and initiates an apoptotic cascade that includes the activation of caspase 3. Taccalonolide is an effective inhibitor of proliferation against both SK-OV-3 and MDA-MB-435 cell with IC50 values of 2.3 μM and 2.1 μM respectively. In contrast to paclitaxel, taccalonolide is effective against the multidrug resistant SKVLB-1 cellline and thus appears to be a poor substrate for P-glycoprotein-mediated transport. Although taccalonolide is almost equipotent with paclitaxel in its effects on cellular microtubules, it is much less potent than paclitaxel in its ability to initiate the polymerization of purified tubulin and microtubule protein. Taccalonolide A is the first microtubule stabilizing agent to be discovered from a plant since identification of the mechanism of action of paclitaxel and it is the first natural product steroid identified to have these cellular effects.
    • 根据本发明,已经鉴定了引发紫杉醇样微管束的热带植物的提取物。 生物测定导向的纯化产生类固醇塔卡膦酸钠A.塔卡尔诺内酯,如紫杉醇,引发异常干细胞和有丝分裂微管的形成。 用卡可龙内酯处理的细胞表现出浓密的微管束,其似乎独立于微管组织中心成核。 由多极心主轴组成的异常有丝分裂主轴由塔卡膦酸钠引发,并且类似于在紫杉醇存在下发现的异常有丝分裂轴。 像紫杉醇一样,他卡多伦可导致细胞核破裂成微核。 Taccalonolide导致G2 / M阻滞,Bc1-2磷酸化并引发凋亡级联,其包括胱天蛋白酶3的激活。塔卡尔诺内酯是对SK-OV-3和MDA-MB-435细胞增殖的有效抑制剂,IC50值为2.3 亩和2.1亩。 与紫杉醇相反,塔卡洛尔内酯对多药耐药性SKVLB-1细胞有效,因此似乎是P-糖蛋白介导的转运的不良底物。 虽然他卡因内酯与紫杉醇在细胞微管上的作用几乎是等效的,但是它的紫杉醇在启动纯化的微管蛋白和微管蛋白的聚合能力方面的效力要低得多。 塔卡品内酯A是鉴定紫杉醇作用机制后从植物中发现的第一种微管稳定剂,它是被鉴定为具有这些细胞效应的第一种天然产物类固醇。