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Página 1 a partir de 57 resultados
Adenosine phosphyorylase activity as distinct from inosine-guanosine phosphorylase activity in Sarcoma 180 cells and rat liver.
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Adenosine phosphorylase (EC 2.4.2.-) activity present in Sarcoma 180 cells grown in culture and in rat liver, is shown to be distinct from inosine-guanosine phosphorylase by several criteria: (a) treatment of Sarcoma 180 cell extract with p-chloromercuribenzoate inhibited the two activities to a
Relationship between antitumor effect and metabolites of 5-fluorouracil in combination treatment with 5-fluorouracil and guanosine in ascites sarcoma 180 tumor system.
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The antitumor activity of 5-fluorouracil (FUra) against ascites Sarcoma 180 was significantly enhanced by coadministration of guanosine, and slightly by adenosine, but not by cytidine or uridine. In advanced ascites Sarcoma 180, guanosine also enhanced the action of FUra, but adenosine, uridine, and
Potentiation of the chemotherapeutic action of 5-fluorouracil by combination with cytidine or guanosine on HRS-sarcoma.
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The chemotherapeutic action of 5-fluorouracil monotherapy on HRS-Sarcoma in mice was compared with those of 5-fluorouracil nucleoside combinations (thymidine, cytidine or guanosine). The curative action of 5-fluorouracil was potentiated without increasing its toxicity, when cytidine or guanosine
Adenosine triphosphate-guanosine 5'-phosphate phosphotransferase. IV. Isozymes in human erythrocytes and Sarcoma 180 ascites cells.
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Adenosine triphosphate-guanosine 5'-phosphate phosphotransferase. II. Inhibition by 6-thioguanosine 5'-phosphate of the enzyme isolated from hog brain and sarcoma 180 ascites cells.
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LDHk, a uniquely regulated cryptic lactate dehydrogenase associated with transformation by the Kirsten sarcoma virus.
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A novel isozyme of lactate dehydrogenase is detected in various cells transformed by the Kirsten murine sarcoma virus (KiMSV). This isozyme, designated LDHk, is strongly inhibited by physiological concentrations of oxygen, in an apparently cooperative fashion. LDHk is inhibited by guanosine
Effects of the chiral isomers of erythro- and threo-9-(2-hydroxy-3-nonyl)adenine on purine metabolism in sarcoma 180 cells.
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The effects of the chiral isomers of erythro- and threo-9-(2-hydroxy-3-nonyl)adenines (EHNA and THNA) on purine metabolism in Sarcoma 180 cells have been determined. At concentrations of 10-80 microM [10- to 1000-fold greater than their Ki values with adenosine deaminase (ADA)], all isomers
DNA synthesis inpermeable mouse ascites sarcoma cells.
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DNA synthesis was studied in mouse ascites sarcoma cells using a permeable cell system. The sarcoma was induced by the Schmidt-Ruppin strain of Rous sarcoma virus. The cells were made permeable to nucleoside triphosphates by treatment with a hypotonic buffer containing 10 mM Tris Cl, 4 mM MgCl2, 1
Studies on cyclic nucleotides in cancer. I. Adenylate guanylate cyclase and protein kinases in the prostatic sarcoma tissue.
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Adenylate, guanylate cyclase and protein kinases in a fibrous sarcoma originating from rat prostate have been studied. A decrease in levels of adenosine 3', 5'-monophosphate (cyclic AMP) and adenylate cyclase activities and an increase in levels of guanosine 3',5'-monophosphate (cyclic GMP) and
Potentiation by guanine nucleosides of the growth-inhibitory effects of adenosine analogs on L1210 and sarcoma 180 cells in culture.
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The growth-inhibitory effect of 6-methylmercaptopurine riboside (MMPR) against leukemia L1210 cells in culture was dramatically potentiated by the addition of guanine nucleosides to the medium. In the presence of either deoxyguanosine or guanosine, the concentration of MMPR that caused 50%
High-level expression in Escherichia coli of enzymatically active Harvey murine sarcoma virus p21ras protein.
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The gene for the Harvey murine sarcoma virus (Ha-MuSV) p21ras protein was fused to the amino-terminal portion of the bacteriophage lambda cII gene on the expression vector pJL6. The fusion was such that transcription was controlled by the well-regulated phage lambda pL promoter, and translation
Inhibition of mannose incorporation into glycoproteins and dolichol-linked intermediates of Sarcoma 180 cells by 6-methylmercaptopurine ribonucleoside.
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6-Methylmercaptopurine ribonucleoside (6-MMPR), an inhibitor of purine nucleotide biosynthesis de novo, was used as a model compound to evaluate the relationship between the levels of intracellular guanosine triphosphate (GTP) and the formation of cellular glycoproteins and their
Membranes from a transplantable osteogenic sarcoma responsive to parathyroid hormone and prostaglandins: regulation of adenylate cyclase and of hormone metabolism.
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Adenylate cyclase activity in particulate fractions from a transplantable rat osteogenic sarcoma was stimulated in a dose-dependent manner by prostaglandins E1 and E2 (PGE1 and PGE2) and parathyroid hormone (PTH). Prostaglandin F2alpha was active at a high concentration (3 x 10(-4) mol/l).
Potentiation of the chemotherapeutic effect of 5-fluorouracil by combination with guanosine 5'-monophosphate.
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The chemotherapeutic effect of the 5-fluorouracil (5-FU)-guanosine 5'-monophosphate (GMP) combination in various mouse tumor systems was compared with that of 5-FU monotherapy. Antitumor activity of 5-FU against L-1210 leukemia was potentiated without increasing its toxicity to the host when GMP at
Alterations in components of adenylate cyclase associated with transformation of chicken embryo fibroblasts by Rous sarcoma virus.
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Regulation of adenylate cyclase coincident with transformation of chicken embryo fibroblasts by Rous sarcoma virus is manifest as a 10-50% decrease in basal, Mg2+-, and forskolin-stimulated activities; activities elicited by fluoride and guanosine 5'-O-(3-thiotriphosphate) are unaltered. The level
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