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Sivu 1 alkaen 40 tuloksia
Fluorescent redox dyes. 1. Production of fluorescent formazan by unstimulated and phorbol ester- or digitonin-stimulated Ehrlich ascites tumor cells.
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The reduction of a new series of tetrazolium salts to red fluorescent formazans by Ehrlich ascites tumor cells is described. The qualitative effect on this reaction of two cell surface-active compounds and of six exogenous electron carriers was investigated by varying the incubation conditions.
Influence of combinations of digitonin with selected phenolics, terpenoids, and alkaloids on the expression and activity of P-glycoprotein in leukaemia and colon cancer cells.
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P-glycoprotein (P-gp or MDR1) is an ATP-binding cassette (ABC) transporter. It is involved in the efflux of several anticancer drugs, which leads to chemotherapy failure and multidrug resistance (MDR) in cancer cells. Representative secondary metabolites (SM) including phenolics (EGCG and thymol),
Digitonin enhances the anti-tumor effect of cisplatin against methylcholanthrene-induced rat sarcoma cells in vitro.
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BACKGROUND
This study was designed to evaluate cellular uptake and cytotoxicity of cisplatin in methylcholanthrene (MCA)-induced rat sarcoma cells when used in combination with a detergent, digitonin.
METHODS
In the cellular intake study, after MCA sarcoma cells (10(7)) were treated with cisplatin
Quantitative determination of apoptotic death in cultured human pancreatic cancer cells by propidium iodide and digitonin.
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We present here the efficacy of an in vitro cytotoxicity assay which can measure rapidly both apoptotic dead cells and cell growth rate, quantitatively. Using a multi-well plate reader, the fluorescence intensity of propidium iodide (PI) corresponding to dead cells and to total cells after digitonin
Synergism of three-drug combinations of sanguinarine and other plant secondary metabolites with digitonin and doxorubicin in multi-drug resistant cancer cells.
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We determined the ability of some phytochemicals, including alkaloids (glaucine, harmine, and sanguinarine), phenolics (EGCG and thymol), and terpenoids (menthol, aromadendrene, β-sitosterol-O-glucoside, and β-carotene), alone or in combination with the saponin digitonin to reverse the relative
Inhibitors of ADP-ribosyl transferase suppress the mitogenic actions exerted by tumour promoters, but not those evoked by peptide mitogens, in primary neonatal rat hepatocytes.
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A significant stimulation of the 24-h (between day 4 and 5 in vitro) new DNA synthetic activity was elicited in primary neonatal rat hepatocytes kept in low-calcium (0.01 mmol/l) HiWoBa2000 synthetic medium by the addition of a single dose (10(-10) mol/l) of each of several tumour promoters [i.e.
Pteridine-binding alpha 1-acid glycoprotein from blood of patients with neoplastic diseases.
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A glycoprotein was selectively enriched in the supernatant (Fraction b) obtained by alcohol and trichloroacetic acid fractionation of digitonin extracts from blood of patients with neoplastic diseases and of control subjects. Subsequent chromatography with concanavalin A:Sepharose separated a
[The effect of membrane-active compounds on the radiation-modifying effect of glucose in x-irradiated ascitic tumor cells].
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A study was made of the influence of membrane-active agents with different mechanisms of action (quercetin, amiloride, valinomycin, and digitonin), that modify the transmembrane transfer of inorganic ions, on a modifying effect of a glucose loading in X-irradiated Ehrlich ascites tumor cells. The
Aryl hydrocarbon receptor modulation of tumor necrosis factor-alpha-induced apoptosis and lysosomal disruption in a hepatoma model that is caspase-8-independent.
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Recent studies suggest that the aryl hydrocarbon receptor (AhR) modulates susceptibilities to some pro-apoptotic agents. AhR-containing murine hepatoma 1c1c7 cultures underwent apoptosis following exposure to tumor necrosis factor-alpha (TNFalpha) + cycloheximide (CHX). In contrast, Tao cells, an
High glycolytic activity of tumor cells leads to underestimation of electron transport system capacity when mitochondrial ATP synthase is inhibited.
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This study sought to elucidate how oligomycin, an ATP synthase blocker, leads to underestimation of maximal oxygen consumption rate (maxOCR) and spare respiratory capacity (SRC) in tumor cells. T98G and U-87MG glioma cells were titrated with the protonophore CCCP to induce maxOCR. The presence of
Reversal of Multidrug Resistance in Human Colon Cancer and Human Leukemia Cells by Three Plant Extracts and Their Major Secondary Metabolites.
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Background: We studied the effect of three plant extracts (Glycyrrhiza glabra, Paeonia lactiflora, Eriobotrya japonica) and six of their major secondary metabolites (glycyrrhizic acid, 18β glycyrrhetinic acid, liquiritigenin, isoliquiritigenin, paeoniflorin, ursolic acid) on the multidrug resistant
Digitonin enhances the antitumor effect of cisplatin during isolated lung perfusion.
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BACKGROUND
The antitumor effect of isolated lung perfusion with cisplatin was limited because the intracellular platinum concentration did not increase sufficiently. To solve this problem, digitonin, a detergent, was chosen to increase cell permeability and enhance intracellular uptake and antitumor
Mitogen-activated protein kinase antisense oligonucleotide inhibits the growth of human lung cancer cells.
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Mitogen-activated protein kinase (MAPK) pathway is proposed to be a therapeutic target for cancer cells. In order to find the potential therapeutic usefulness of MAPK for cancer cells, the effect of EAS1, an antisense oligonucleotide for an MAPK, on cancer-cell-growth were investigated in vitro.
Cytotoxicity of digitoxin and related cardiac glycosides in human tumor cells.
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The saponin digitonin, the aglycone digitoxigenin and five cardiac glycosides were evaluated for cytotoxicity using primary cultures of tumor cells from patients and a human cell line panel (representing different cytotoxic drug-resistance patterns). Of these seven compounds, proscillaridin A was
Capsaicin and Piperine Can Overcome Multidrug Resistance in Cancer Cells to Doxorubicin.
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BACKGROUND
Multidrug resistance (MDR) can develop in cancer cells after treatment with anticancer drugs, mainly due to the overexpression of the ATP-binding cassette (ABC) transporters. We analyzed the ability of two pungent-tasting alkaloids-capsaicin and piperine from Capsicum frutescens and Piper
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