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Synthesis and biological evaluation of taxinine analogues as orally active multidrug resistance reversal agents in cancer.
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Three novel taxinine analogues were prepared and tested for their activity as multidrug resistance (MDR) reversal agents in comparison with verapamil. In vitro testing demonstrated that compounds 8-10 possess MDR-reversal activity in the KB/V cell line. Half-hour after treatment with 5, 10, and 20
An efficient conversion of taxinine to taxinine NN-1, an anticancer agent and a modulator of multidrug-resistant tumor cells.
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Taxinine NN-1 (1), which shows significant activities as a modulator of multidrug-resistant cancer cells and as an anticancer agent in an in vitro assay based on a HCC panel, was synthesized in order to obtain sufficient material for a higher order bioassay from easily available taxinine (2). The
Highly increased cellular accumulation of vincristine, a useful hydrophobic antitumor-drug, in multidrug-resistant solid cancer cells induced by a simply reduced taxinine.
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Regio- and/or chemo-selective reductions of taxinine (1a), a taxane diterpenoid readily obtainable from the needles of a Japanese yew (Taxus cuspidata), at the 5-O-cinnamoyl and 4-exo-methylene moieties have been accomplished by the catalytic hydrogenation over Pd/C or Rh/C to obtain
Taxines from the needles of Taxus wallichiana.
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A taxine, 5 alpha O-(3'-dimethylamino-3'-phenylpropionyl) taxinine M (1) together with two known compounds 7-O-acetyltaxine A (2) and 2 alpha-acetoxy-2' beta-deacetylaustrospicatine (3) were isolated from the needles of the Himalayan yew, Taxus wallichiana Zucc. Their structures were elucidated on
[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
A new taxoid from a callus culture of Taxus cuspidata as an MDR reversal agent.
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A new taxoid, 5alpha,13alpha-diacetoxy-10beta-cinnamoyloxy-4(20),11-taxadien-9alpha-ol (1) along with its 9,10-isomer, taxinine NN-11 (2) were isolated from the callus cultures of Taxus cuspidata. The structures were identified by the analyses of the spectral data and chemical method. Their in vitro
Structure-activity relationships of some taxoids as multidrug resistance modulator.
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1,7-Deoxy-4-deacetylbaccatin III (12) and its five analogues 6-9, 13, and their oxetane ring opened derivatives 14, 16, and 17, which were synthesized from taxinine, showed significant activity as MDR reversal agent by the assay of the calcein accumulation toward MDR human ovarian cancer 2780AD
Syntheses of taxuspine C derivatives as functional inhibitors of P-glycoprotein, an ATP-associated cell-membrane transporter.
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UV-Irradiation of taxinine and related compounds in acetonitrile induced a smooth transannulation between the C-3 and C-11 positions without any influence from the C-2, C-9 and C-10 substituents to give tetracyclic taxuspine C derivatives in almost quantitative yields. Photochemical transannular
Effect of seven tricyclic diterpenoids from needles of Taxus media var. Hicksii on stimulus-induced superoxide generation, tyrosyl or serine/threonine phosphorylation and translocation of cytosolic compounds to the cell membrane in human neutrophils.
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Taxol has been widely used as an anticancer drug for ovarian, breast, lung and prostate cancer. Some kinds of Taxus plants are widely distributed in the Northeast Asia region. We have isolated seven tricyclic diterpenoids, taxinine, taxagifine, 5-O-cinnamoyltaxacin I triacetate,
Identification of taxanes in extracts from leaves of Taxus baccata L. using (13)C-NMR spectroscopy.
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BACKGROUND
The study of taxanes is a hot topic worldwide because of their potential activity against cancer. Analysis of taxanes in extracts of various Taxus species is generally achieved using HPLC.
OBJECTIVE
The aim of the current work was to identify taxanes in different fractions of extracts
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