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Página 1 a partir de 18 resultados
Inhibition of heat shock proteins (HSP) expression by quercetin and differential doxorubicin sensitization in neuroblastoma and Ewing's sarcoma cell lines.
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Neuroblastoma (NB) and Ewing's sarcoma (ES) represent the most common extracranial solid tumors of childhood. Heat shock proteins (HSP) are elevated in cancer cells and their over-expression was correlated to drug-resistance. In this work we identified the HSP by a sensitive proteomic analysis of NB
The effect of quercetin on the phosphorylation activity of the Rous sarcoma virus transforming gene product in vitro and in vivo.
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The phosphotransferase activity of the Rous sarcoma virus src gene product, pp60src, was inhibited both in vitro and in vivo by the bioflavonoid quercetin. The Ki for the inhibitory effect was in the range of 6-11 microM under conditions in vitro. The inhibitory effect of quercetin was competitive
Damage induced in sarcoma 37 with podophyllin, podophyllotoxin alpha-peltatin, beta-peltatin, and quercetin.
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The cytological effect of chemicals on ascites sarcomas. III. Damage induced by podophyllotoxin, alpha-peltatin, beta-peltatin and quercetin.
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Serine kinase activity associated with Maloney murine sarcoma virus-124-encoded p37mos.
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An antiserum directed against amino acid residues 37-55 [anti-mos (37-55) serum] of the predicted v-mos sequence was used to precipitate p37mos from Moloney murine sarcoma virus-124 (Mo-MuSV-124) acutely infected 3T3 cells. Proteins with sizes ranging from p37mos to 43 kDa (p43) were found to be
Purification and characterization of the feline sarcoma virus tyrosine-specific kinase pp85gag-fes.
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The transforming phosphoprotein pp85gag-fes of the Snyder-Theilen strain of feline sarcoma virus (ST-FeSV) was purified in a form which exhibits tyrosine-specific kinase activity. Cell lysates of ST-FeSV-transformed mink nonproducer cells were applied to a column of DEAE-Sephacel and eluted with a
TPCK and quercetin act synergistically with vanadate to increase protein-tyrosine phosphorylation in avian cells.
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We have found four compounds that act synergistically with the phosphotyrosine phosphatase inhibitor sodium orthovanadate (Na3VO4) to greatly increase the extent of protein-tyrosine phosphorylation in both uninfected chick embryo fibroblasts (CEF) and their Rous sarcoma virus-transformed
Quercetin induces apoptosis and autophagy in primary effusion lymphoma cells by inhibiting PI3K/AKT/mTOR and STAT3 signaling pathways.
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Quercetin, a bioflavonoid contained in several vegetables daily consumed, has been studied for long time for its antiinflammatory and anticancer properties. Quercetin interacts with multiple cancer-related pathways such as PI3K/AKT, Wnt/β-catenin and STAT3. These pathways are hyperactivated in
Quercetin inhibits migration and invasion of SAS human oral cancer cells through inhibition of NF-κB and matrix metalloproteinase-2/-9 signaling pathways.
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Quercetin, a principal flavanoid compound in onions, has been shown to possess a wide spectrum of pharmacological properties, including anticancer activities. Our earlier study showed that quercetin induced cytotoxic effects on SAS human oral cancer cells. In this study, we found that quercetin
Down-regulation of increased signal transduction capacity in human cancer cells.
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Signal transduction capacity in human cancer cells is constitutively up-regulated by the markedly increased steady-state activities of the three synthetic enzymes, PI kinase, PIP kinase and PLC, which catalyze the conversion of PI to the second messengers IP3 and DAG. This evidence is supported by
Early release of the density-dependent inhibition of phosphate uptake and ATP synthesis after src gene expression in chick embryo fibroblasts.
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Our results showed that the expression of the src gene in chick embryo fibroblasts (CEF) released the density-dependent inhibition (DDI) of phosphate metabolism (phosphate uptake and phosphorylation of small organic compounds). With increasing cell density, phosphate metabolism decreased by 58% in
Detection of a tyrosine kinase in human sera and blood cells by pp60src antiserum.
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Using sera of Rous sarcoma virus-tumor bearing rabbits (TBR-sera) as a tool to detect pp60src kinase in immunoprecipitates, we report here that about 10% of our TBR-sera revealed tyrosine kinase activity in human serum, plasma and in soluble extracts of human blood cells. The activity found in serum
Anti-tumour activity of two 19-nor-clerodane diterpenes, trans-dehydrocrotonin and trans-crotonin, from Croton cajucara.
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The effects of two nor-diterpenes, trans-dehydrocrotonin (DCTN) and trans-crotonin (CTN) from Croton cajucara (Euphorbiaceae), on the survival of mice bearing Sarcoma 180 and Ehrlich carcinoma ascitic tumours, on the proliferation of cultured Ehrlich cells and TNF alpha activity were determined.
Oxidant species are involved in T/B-mediated ERK1/2 phosphorylation that activates p53-p21 axis to promote KSHV lytic cycle in PEL cells.
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KSHV is a gammaherpesvirus strongly associated to human cancers such as Primary Effusion Lymphoma (PEL) and Kaposi's Sarcoma. The naturally virus-infected tumor cells usually display latent infection since a minority of cells undergoes spontaneous viral replication. The lytic cycle can be induced in
Pharmacological modulation of oncogenic Ras by natural products and their derivatives: Renewed hope in the discovery of novel anti-Ras drugs.
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Oncogenic rat sarcoma (Ras) is linked to the most fatal cancers such as those of the pancreas, colon, and lung. Decades of research to discover an efficacious drug that can block oncogenic Ras signaling have yielded disappointing results; thus, Ras was considered "undruggable" until recently.
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