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Sayfa 1 itibaren 17 Sonuçlar

Potent cytotoxic lignans from Justicia procumbens and their effects on nitric oxide and tumor necrosis factor-alpha production in mouse macrophages.

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A new lignan glycoside, 4-O-alpha-L-arabinopyranosyl-(1' "-->2' ')-beta-D-apiofuranosyldiphyllin (2), named procumbenoside A, and 11 known compounds were isolated from the whole plant of Justicia procumbens. The structure of 2 was established by spectral analysis and chemical methods. The known

Lignans from Dysosma versipellis with inhibitory effects on prostate cancer cell lines.

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A new monoepoxylignan, dysosmarol (1), along with eight known compounds, podophyllotoxin (2), 4'-demethylpodophyllotoxin (3), deoxypodophyllotoxin (4), 4'-demethyldeoxypodophyllotoxin (5), diphyllin (6), kaempferol, quercetin, and beta-sitosterol, were isolated from the roots of Dysosma versipellis.

Reversal of P-glycoprotein-mediated drug efflux by eudesmin from Haplophyllum perforatum and cytotoxicity pattern versus diphyllin, podophyllotoxin and etoposide.

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The present study focuses on eudesmin (bicyclic lignan, 0.15 % of dry leaves) and diphyllin (arylnaphthalene lignan, 0.1 % of dry roots), both isolated from H. perforatum Kar. et Kir, a Rutaceae species endemic to Uzbekistan. We first compared their specificity for cancer cells with those of

Synthesis and bioevaluation of diphyllin glycosides as novel anticancer agents.

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A series of diphyllin glycosides were synthesized from diphyllin by phase transfer catalysis glycosylation, deprotection, and etherification, and the structures were established by (1) H NMR, (13) C NMR, and HRMS. These glycosides were evaluated for their in vitro cytotoxicity against HCT-116, A549,

A Synthetic Disaccharide Derivative of Diphyllin, TAARD, Activates Human Natural Killer Cells to Secrete Interferon-Gamma via Toll-Like Receptor-Mediated NF-κB and STAT3 Signaling Pathways.

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Natural products and their derivatives have long been used as pharmacological agents in the fight against cancer. Human natural killer (NK) cells are critical in our immune system in that they are capable of destroying tumor cells directly. However, there are few reports that elucidate the role of

Effects of diphyllin as a novel V-ATPase inhibitor on gastric adenocarcinoma.

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The natural compound diphyllin, a cytostatic lignan isolated from Cleistanthus collinus, can dramatically inhibit the proliferation and induce the apoptosis of human gastric cancer cells, SGC7901. Our study found that diphyllin can inhibit the expression of V-ATPases in a dose-dependent manner,

Synthesis of podophyllotoxin congeners as potential DNA topoisomerase II inhibitors.

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We have synthesized a number of new podophyllotoxin congeners in which the A-ring is opened and the C-ring is aromatic. These are based on the chemically modified structures of the naturally occurring podophyllum lignan, diphyllin. These have been synthesized by employing the Michael Initiated Ring

Anti-inflammatory activities of constituents isolated from Phyllanthus polyphyllus.

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Four compounds, including one benzenoid, 4-O-methylgallic acid (1), together with three arylnaphthalide lignans, namely phyllamyricin C (2), justicidin B (3) and diphyllin (4) were isolated from the whole plants of Phyllanthus polyphyllus L. (Euphorbiaceae). This was the first isolation report of

Arylnaphthalene lignans from Taiwania cryptomerioides as novel blockers of voltage-gated K+ channels.

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Lignans are natural phytochemicals which exhibit multiple pharmacological effects such as anti-inflammation, antivirus and anti-tumor activities. Whether they have effects on neural tissues and ion channels is still unknown. The effects of several arylnaphathalene lignans purified from Taiwania

Anticancer potential of cleistanthin A isolated from the tropical plant Cleistanthus collinus.

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A diphyllin glycoside called cleistanthin A was isolated from the tropical plant Cleistanthus collinus and its anticancer potential was assessed. This compound showed preferential cytotoxicity in several tumor cell lines. The GI50 values for normal cell lines were between 10(-6) and 10(-7) M while

Synthesis, cytotoxicity and pro-apoptosis of novel benzoisoindolin hydrazones as anticancer agents.

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A series of benzoisoindolin hydrazones as analogues of natural lignan diphyllin were synthesized and the structures of these compounds were established by (1)H-NMR, (13)C-NMR, Mass and high resolution (HR)-MS. The compounds were evaluated for in vitro cytotoxicity against KB, A549 and HCT-116 cancer

M3, a natural lignan xyloside, exhibits potent anticancer activity in HCT116 cells.

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4-O-(2',3',4'-tri-O-methyl-β-D-xylopyranosyl) diphyllin (M3) is a cytotoxic compound that was first isolated from the aerial parts of Phyllanthus taxodiifolius. The current study demonstrated that M3, a lignan xyloside, exhibits anticancer effects in a number of cancer cell lines by MTT test,

Cytotoxic arylnaphthalene lignans from a Vietnamese acanthaceae, Justicia patentiflora.

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One new norlignan (1) and five new lignans (2-6) were isolated from the leaves and stems of Justicia patentiflora by a bioassay-guided purification. Five known compounds, carinatone, diphyllin, justicidin A, taiwanin E, and tuberculatin, were also found in J. patentiflora. Most of the new compounds

Differential modulation of Bax/Bcl-2 ratio and onset of caspase-3/7 activation induced by derivatives of Justicidin B in human melanoma cells A375.

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Diphyllin and its derivatives are well known cytotoxic natural products structurally related to the anti-cancer drug podophyllotoxin. We here study their structure-activity relationship upon human melanoma cells for first time. To this end, human melanoma A375 cells were incubated with Justicidin B

New cyclopeptide alkaloids from the whole plant of Justicia procumbens L.

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Three novel 14-membered cyclopeptide alkaloids, justicianenes B-D (1-3), were isolated from the EtOH extract of the whole plant of Justicia procumbens L., and their structures were determined on the basis of detailed NMR spectroscopic data and the absolute stereochemistry of the

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