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Stran 1 iz 876 rezultatov
Diterpenes from Cryptomeria japonica inhibit androgen receptor transcriptional activity in prostate cancer cells.
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We identified eight diterpenes from Cryptomeria japonica (Taxodiaceae), which inhibit the activity of the androgen receptor (AR) in human prostate cancer (PCa) 22Rv1-derived 103E cells. The compounds 6,12-dihydroxyabieta-5,8,11,13-tetraen-7-one ( 2), sugiol ( 3), ferruginol ( 4), and
New anti-cancer characteristics of jatrophane diterpenes from Euphorbia dendroides.
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Jatrophane diterpenes were shown to be inhibitors of P-glycoprotein (P-gp). There are also evidences on their microtubule-interacting activity in cancer cells. We evaluated new anti-cancer characteristics of two jatrophane type compounds from Euphorbia dendroides. For that purpose, the model system
Stimulation of human monocyte oxidative burst and related cytotoxicity by tumor-promoting and non-tumor-promoting diterpene esters, indole alkaloids and polyacetate-type agents.
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Human peripheral blood monocytes were cultured and exposed to plant diterpenes, indole alkaloids and polyacetates with various degrees of tumor-promoting activity. The effect of the above-mentioned encounter on monocyte function was examined, as expressed by H2O2 production and lysis of dog
Tumor promoting diterpenes from Euphorbia leuconeura L.
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Diterpene esters of the phorbol and ingenol types are known to be highly active tumor promoting agents that typically occur in members of the Euphorbiaceae. In the present work, Euphorbia leuconeura, a rare indoor plant, is analyzed for its tumor promoting potential. Latex as well as total leaf
Multidrug resistant cancer cells susceptibility to cytotoxic taxane diterpenes from Taxus yunnanensis and Taxus chinensis.
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Twelve taxane diterpenes (1-12), which were isolated previously from the EtOH extract of the aerial parts of Taxus yunnanensis or Taxus chinensis, were evaluated for cytotoxicity against the multidrug resistant cancer cells KB-VIN and KB-7d. Compounds and showed significant cytotoxicity in these
Dietary cancer risk from conditional cancerogens (tumor promoters) in produce of livestock fed on species of spurge (Euphorbiaceae). V. Skin irriitant and tumor-promoting diterpene ester toxins of the tigliane and ingenane type in the herbs Euphorbia nubica and Euphorbia helioscopia contaminating fodder of livestock.
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Irritant diterpene ester toxins were isolated from Euphorbia nubica and E. helioscopia, which are contaminants of the green fodder of livestock in Egypt. Fractionations of methanol extracts of aerial parts of both plants were monitored by the irritation unit on the mouse ear. Plant extracts were
On the active principles of the spurge family (Euphorbiaceae). XI. [1] The skin irritant and tumor promoting diterpene esters of Euphorbia tirucalli L. originating from South Africa.
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The irritant and tumor-promoting constituents of latex of Euphorbia tirucalli L. originating from South Africa were isolated. They were identified as irritant ingenane and tigliane type diterpene esters derived from unsaturated aliphatic acids and acetic acid and the polyfunctional diterpene parent
Intermedin A, a New Labdane Diterpene Isolated from Alpinia intermedia, Prolonged the Survival Time of P-388D1 Tumor-Bearing CDF1 Mice.
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Eight ethanolic extracts of indigenous Taiwanese plants of the genus Alpinia were tested for tumor cytotoxicity against AGS, Hep G2, HeLa, KB, and HL-60 cells. Among the 50 % and 95 % EtOH extracts of eight Alpinia species, the cytotoxic effects of Alpinia intermedia leaves were the strongest. When
Euphoportlandols A and B, tetracylic diterpene polyesters from Euphorbia portlandica and their anti-MDR effects in cancer cells.
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Two new tetracyclic diterpene polyesters, euphoportlandols A (1) and B (2), have been isolated along with 12 known tetracyclic triterpenes from an acetone extract of Euphorbia portlandica. Their structures were established as
Disruption of androgen and estrogen receptor activity in prostate cancer by a novel dietary diterpene carnosol: implications for chemoprevention.
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Emerging data are suggesting that estrogens, in addition to androgens, may also be contributing to the development of prostate cancer (PCa). In view of this notion, agents that target estrogens, in addition to androgens, may be a novel approach for PCa chemoprevention and treatment. Thus, the
Dietary cancer risk from conditional cancerogens in produce of livestock fed on species of spurge (Euphorbiaceae). III. Milk of lactating goats fed on the skin irritant herb Euphorbia peplus is polluted by tumor promoters of the ingenane diterpene ester type.
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Special procedures were developed to investigate poisonous milk of lactating goats fed experimentally on aerial parts of the herb Euphorbia peplus L. In extracts of the milk, weakly irritant in the mouse-ear assay, three diterpene ester toxins were detected by techniques of high-performance liquid
Cleistanthane diterpenes from the seed of Caesalpinia sappan and their antiausterity activity against PANC-1 human pancreatic cancer cell line.
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Three new cleistanthane diterpenes named tomocinon (1), tomocinol A (2), and tomocinol B (3), were isolated from the EtOAc extract of the seed of Caesalpinia sappan. Their structures were determined by extensive NMR spectroscopic analysis. The absolute stereochemistry of tomocinon (1) has been
A novel diterpene suppresses CWR22Rv1 tumor growth in vivo through antiproliferation and proapoptosis.
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Androgen receptor (AR) is the main therapeutic target for treatment of metastatic prostate cancers (PCa). As recurrent tumors restore AR activity independent of hormones, new therapies that abolish AR activity have been sought to prevent or delay the emergence of ablation-resistant disease. Here, we
Casearin X, its degradation product and other clerodane diterpenes from leaves of Casearia sylvestris: evaluation of cytotoxicity against normal and tumor human cells.
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An EtOH extract of the leaves of Casearia sylvestris afforded new clerodane diterpene, casearin X, together with the known compounds casearins B, D, L, and O, and caseargrewiin F. Casearin X degraded to the corresponding dialdehyde when stored in CDCl(3). The diterpenes isolated were cytotoxic to
Diterpenes from Euphorbia piscatoria: synergistic interaction of Lathyranes with doxorubicin on resistant cancer cells.
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Four new diterpenes were isolated from the methanolic extract of Euphorbia piscatoria, two ent-abietanes (1, 2) and two lathyrane-type macrocyclic diterpenes (3, 4), along with three known diterpenes (5-7). Their structures were characterized by spectroscopic methods, mainly 1D and 2D NMR ((1)H,
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