uridine/سرطان

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Uridine diphosphate reductase of Ehrlich ascites tumor is insensitive to hydroxyurea.

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Uridine diphosphate (UDP) reductase was isolated in the supernatant fraction obtained after the acidification of the cytosol of Ehrlich ascites tumor cells, and was found insensitive to 10 mM hydroxyurea. However, cytidine diphosphate (CDP) reductase, being separated concurrently in the precipitate

Positron imaging feasibility studies: selective tumor concentration of 3H-thymidine, 3H-uridine, and 14C-2-deoxyglucose.

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The potential usefulness of substrates for glycolysis and nucleic acid synthesis as tumor imaging agents was compared to that of 67Ga-citrate. In separate experiments, 3H-thymidine, 3H-uridine, 14C-2-deoxyglucose, and 67Ga-citrate were injected intraveneously into BALB/c mice with solid subcutaneous

Comparative autoradiographic in vitro study of the incorporation of 3H-thymidine and 3H-uridine into the DNA and RNA of solid tumours in children.

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3H-thymidine and 3H-uridine labelling indices (LIth and LIur) were determined simultaneously using an autoradiographic method in 19 solid tumours: 6 Wilms' tumours, 5 neuroblastomas, 4 osteogenic sarcomas, and 4 various tumours. At a LIth of 2.7 to 47.0% (average 22.3%) all LIur were significantly

Tamoxifen induces Na+ -dependent uridine transport and dome formation in a human breast tumor cell line.

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OBJECTIVE To correlate changes in uridine transport and colony morphology with differentiation of human breast cancer cells by tamoxifen and related agents. METHODS Cultures of MCF-7 human breast cancer were treated with estradiol or the antiestrogen derivatives tamoxifen, hydroxytamoxifen, and ICI

High uridine phosphorylase activity in human melanoma tumor.

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Uridine (Urd) phosphorylase and Urd kinase activities were examined in 4 human tumor types including melanoma and human and mouse melanoma cell lines. Urd phosphorylase activity in melanoma tumor specimens was higher than in specimens of colon, ovarian, and breast tumors. Urd kinase activity levels

Uridine diphosphate glucuronide transferase 1A1FNx0128 gene polymorphism and the toxicity of irinotecan in recurrent and refractory small cell lung cancer.

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OBJECTIVE The aim was to investigate the association between uridine diphosphate glucuronide transferase 1A1 (UGT1A1) gene promoter region polymorphism and irinotecan-related adverse effects and efficacy on recurrent and refractory small cell lung cancer (SCLC). METHODS A total of 31 patients with

Phase I trial of PN401, an oral prodrug of uridine, to prevent toxicity from fluorouracil in patients with advanced cancer.

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OBJECTIVE We performed a phase I study to determine the appropriate dose of PN401, a uridine (URD) prodrug, to use as a rescue agent for fluorouracil (FU) and than to determine the maximum-tolerated dose (MTD) of FU when given with PN401. METHODS Patients with advanced cancer received oral PN401 as

No association between cyclooxygenase-2 and uridine diphosphate glucuronosyltransferase 1A6 genetic polymorphisms and colon cancer risk.

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OBJECTIVE To investigate the association of variations in the cyclooxygenase-2 (COX2) and uridine diphosphate glucuronosyltransferase 1A6 (UGT1A6) genes and non-steroidal anti-inflammatory drugs (NSAIDs) use with risk of colon cancer. METHODS NSAIDs, which are known to reduce the risk of colon

Enhancing Tumor Targeting Efficiency of Radiolabeled Uridine (via) Incorporation into Nanocubosomal Dispersions.

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Background: Several nanosystems are currently being utilized to enhance the targeting efficiency of several cancer chemotherapeutic agents. This study was designed to improve tumor accumulation of iodine-125 (¹²⁵I)-uridine via incorporation into a nanocubosomal preparation.

Uridine diphosphoglucuronosyltransferase pharmacogenetics and cancer.

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The uridine diphosphoglucuronosyltransferases (UGTs) belong to a superfamily of enzymes that catalyse the glucuronidation of numerous endobiotics and xenobiotics. Several human hepatic and extrahepatic UGT isozymes have been characterized with respect to their substrate specificity, tissue

Identification and cloning of a novel androgen-responsive gene, uridine diphosphoglucose dehydrogenase, in human breast cancer cells.

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Androgens inhibit the growth of breast cancer cells, but the mechanism of androgen-induced growth inhibition has not yet been elucidated, and few androgen-responsive genes have been identified. We, therefore, used differential display PCR to identify novel androgen-responsive genes in ZR-75-1 human

19F NMR monitoring of in vivo tumor metabolism after biochemical modulation of 5-fluorouracil by the uridine phosphorylase inhibitor 5-benzylacyclouridine.

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A uridine phosphorylase inhibitor, 5-benzylacyclouridine (BAU), has been utilized as biochemical modulator of 5-fluorouracil (5-FU) anti-tumor activity in a murine tumor model. The effect of BAU on 5-FU metabolism has been evaluated using in vitro and in vivo 19F NMR spectroscopy. The analysis of

Role of the uridine/cytidine kinase 2 mutation in cellular sensitiveness toward 3'-ethynylcytidine treatment of human cancer cells.

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A nucleosidic medicine, 1-(3-C-ethynyl-β-D-ribo-pentofuranosyl)cytosine [3'-ethynylcytidine (ECyd)], is a potent inhibitor of RNA polymerase I and shows anticancer activity to various human solid tumors in vitro and in vivo. ECyd is phosphorylated to 3'-ethyntlcytidine 5'-monophosphate by

Sensitivity of human cancer cells to the new anticancer ribo-nucleoside TAS-106 is correlated with expression of uridine-cytidine kinase 2.

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TAS-106 [1-(3-C-ethynyl-beta-D-ribo-pentofuranosyl)cytosine] is a new anticancer ribo-nucleoside with promising antitumor activity. We have previously presented evidence suggesting that the TAS-106 sensitivity of cells is correlated with intracellular accumulation of the triphosphate of TAS-106,

Effect of administration of 5-(phenylselenenyl)acyclouridine, an inhibitor of uridine phosphorylase, on the anti-tumor efficacy of 5-fluoro-2'-deoxyuridine against murine colon tumor C26-10.

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The effect of co-administration of 5-(phenylselenenyl)acyclouridine (PSAU), a new uridine phosphorylase (UrdPase, EC 2.4.2.3) inhibitor, on the efficacy of 5-fluoro-2'-deoxyuridine (FdUrd) was tested against murine colon C26-10 tumor xenografts. In contrast to our previous results with human tumors,

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Herbal & Natural Medicine

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