cephalomannine/rak

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Overcoming tumor drug resistance with C2-modified 10-deacetyl-7-propionyl cephalomannines: a QSAR study.

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The microtubule-stabilizing taxanes such as paclitaxel and docetaxel are the two most important anticancer drugs currently used in clinics for the treatment of various types of cancers. However, the major common drawbacks of these two drugs are drug resistance, neurotoxicity, substrate for drug

[Quantitative changes of anti-cancer active components in Taxus chinensis var. mairei branches and leaves].

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The quantitative changes of anti-cancer ingredients such as taxol, cephalomannine, baccatin III and 10-deacetylbaccatin III in the branches and leaves of Taxus chinensis var. mairei during one growth season were measured by HPLC. The results showed that the contents of these anticancer ingredients

Ovarian Cancer Treatment Stratification Using Ex Vivo Drug Sensitivity Testing.

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Treatment options for patients with platinum-resistant ovarian cancer are generally palliative in nature and rarely have realistic potential to be curative. Because many patients with recurrent ovarian cancer receive aggressive chemotherapy for prolonged periods, sometimes

Antitumor activity of paclitaxel (taxol) analogues on MDR-positive human cancer cells.

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A series of newly developed paclitaxel analogues have been tested for their growth inhibitory activity on two human breast cancer cell lines, one of which expresses the MDR (multidrug resistance) phenotype. Paclitaxel (taxol) was used as a reference compound. Three new classes of taxanes were

[Studies on the chemical constituents of Taxus yunnanensis].

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The ethanolic extract of the bark of Taxus yunnanensis Cheng et L. K. Fu. showed significant antineoplastic effect on the transplantable tumors in mice. The life survival of P388 leukemic bearing mice was increased (84%) and the growth of B16 melanoma in mice was inhibited (53%). From this extract

Synthesis and separation of potential anticancer active dihalocephalomannine diastereomers from extracts of Taxus yunnanensis.

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Two diastereomeric 2",3"-dibromo cephalomannines and their two corresponding 7-epimers were obtained by treatment of extracts of Taxus yunnanensis with bromine solution under mild conditions. Treatment of the same extract with chlorine solution yielded four diasteromeric

A validated high performance liquid chromatograph-photodiode array method for simultaneous determination of 10 bioactive components in compound hongdoushan capsule.

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BACKGROUND The compound Hongdoushan capsule (CHC) is widely known as compound herbal preparation and is often used to treat ovarian cancer and breast cancer, and to enhance the body immunity, etc., in clinical practice. OBJECTIVE To determine simultaneously 10 bioactive components from CHC, namely

Antitumor agents 210. Synthesis and evaluation of taxoid-epipodophyllotoxin conjugates as novel cytotoxic agents.

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Five compounds composed of a taxoid (paclitaxel or cephalomannine) and a 4'-O-demethyl epipodophyllotoxin derivative joined by an imine linkage were prepared and evaluated as cytotoxic agents and inhibitors of mammalian DNA topoisomerase II. Compounds 12 and 14-16 exhibited comparable or better

A novel bioassay for screening and quantification of taxanes.

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We report a novel method for screening and quantifying tubulin-binding antimitotic agents that promote microtubule formation. The method is based on the shift in the peak of the fluorescence emission difference spectrum of tubulin complexed to metal free tetrakis(4-carboxyphenyl)porphyrin (TCPP) in

Determination of paclitaxel in mouse plasma and brain tissue by liquid chromatography-mass spectrometry.

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Paclitaxel is an anticancer agent extracted from the bark of the yew tree and is widely used in chemotherapy for solid tumors, including non-small cell lung cancer and ovarian carcinoma. Most assays to measure paclitaxel in plasma require a large amount of sample (0.4-1 ml) to achieve the necessary

Lx2-32c, a novel taxane and its antitumor activities in vitro and in vivo.

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Lx2-32c, a novel taxane derivative, is a semisynthetic analogue from cephalomannine. Its antitumor activity in vivo and in vitro was investigated in this study. Lx2-32c was cytotoxic (IC50=1.7+/-1.6nM) to various human tumor cell lines after 72h incubation. In vitro it enhanced the rate of tubulin

Development of an indirect competitive enzyme-linked immunosorbent assay (icELISA) using highly specific monoclonal antibody against paclitaxel.

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Paclitaxel, the major active component of the yew tree, is used as an important anti-cancer agent. To obtain the monoclonal antibody (MAb) against paclitaxel for paclitaxel determination using immunoassay, 7-xylosyltaxol was conjugated to the carrier protein bovine serum albumin (BSA) to construct

Effects of genetic, epigenetic, and environmental factors on taxol content in Taxus brevifolia and related species.

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The demand for taxol, a promising cancer chemotherapeutic agent, far exceeds supply. Presently, taxol is derived from the bark of the Pacific yew, Taxus brevifolia, a small, slow-growing evergreen tree native to the northwestern United States. Knowledge of the distribution and magnitude of genetic

[Content and distribution of active components in cultivated and wild Taxus chinensis var. mairei plants].

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Taxus chinensis var. mairei is an endemic and endangered plant species in China. The resources of T. chinensis var. mairei have been excessively exploited due to its anti-cancer potential, accordingly, the extant T. chinensis var. mairei population is decreasing. In this paper, ultrasonic extraction

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