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Página 1 a partir de 109 resultados
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
Selective inhibition of nuclear DNA synthesis by 9- -D-arabinofuranosyl adenine in rat cells transformed by Rous sarcoma virus.
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The drug, 9-beta-D-arabinofuranosyl adenine, selectively inhibits the synthesis of nuclear DNA without affecting extrachromosomal DNA synthesis in rat cells transformed by Rous sarcoma virus (B-mix K-44/6). The inhibition was linear with respect to drug concentration over the range of 37-600 muM.
Muscle performance and adenine-nucleotides status in MCA-sarcoma tumor-bearing rats.
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The reduction in DNA, RNA, amino acid, and total protein in muscle tissue of tumor-bearing rats may influence muscle function. The effects of MCA-sarcoma tumor burden on muscle performance and adenine nucleotides was evaluated in three fiber types of skeletal muscle. Twenty-one days after
Antiretroviral activities of acyclic nucleoside phosphonates [9-(2-phosphonylmethoxyethyl)adenine, 9-(2-phosphonylmethoxyethyl)guanine, (R)-9-(2-phosphonylmethoxypropyl)adenine, and MDL 74,968] in cell cultures and murine sarcoma virus-infected newborn NMRI mice.
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From a side-by-side comparative study, the acyclic nucleoside phosphonates (R)-9-(2-phosphonylmethoxypropyl)adenine [(R)-PMPA] and 9-(2-methylidene-3-phosphonomethoxypropyl)guanine (MDL 74,968) proved more selective in their inhibitory effect on human immunodeficiency virus types 1 and 2, feline
Transcriptional activation of the adenine phosphoribosyltransferase promoter by an upstream butyrate-induced Moloney murine sarcoma virus enhancer-promoter element.
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It has been documented that the activity of a specific promoter can be occluded by the presence of another promoter element upstream. We present evidence for a phenomenon contradictory to that predicted by the promoter occlusion theory. Transcription from the hamster aprt (adenine
Inhibitory effects of 9-(2-phosphonylmethoxyethyl)adenine and 3'-azido-2',3'-dideoxythymidine on tumor development in mice inoculated intracerebrally with Moloney murine sarcoma virus.
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9-(2-Phosphonylmethoxyethyl)adenine (PMEA), a potent inhibitor of human immunodeficiency virus (HIV), caused a dose-dependent suppression of tumor formation, and mortality associated therewith, in 6-day-old NMRI mice inoculated intracerebrally with Moloney murine sarcoma virus (MSV). Even at a dose
The effect of sarcoma 180 and other stressing agents upon adrenal adenine nucleotide-metabolizing enzymes.
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Cytostatic effect of 9-(2-phosphonomethoxyethyl) adenine (PMEA). III. Rat and mouse carcinomas and sarcomas.
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The cytostatic potency of PMEA was evaluated on five rat and mouse experimental tumors. The compound significantly inhibits three spontaneously arisen (LW13K2, A870N and LLC) tumors. Two chemically induced tumors (FBN, HEP-LEW) were not influenced by PMEA.
The effect of D-glucosamine on the adenine and uridine nucleotides of sarcoma 180 ascites tumor cells.
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9-(S)-(2,3-Dihydroxypropyl)adenine inhibits the transformation of chick embryo fibroblasts infected with Rous sarcoma virus: Evidence for inhibition of enzymatic activity of isolated cellular protein kinases by the drug.
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Synergistic effect of 6-mercaptopurine and 6-methylmercaptopurine ribonucleoside on the levels of adenine nucleotides of Sarcoma 180 cells.
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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
Restoration of several morphological characteristics of normal fibroblasts in sarcoma cells treated with adenosine-3':5'-cyclic monphosphate and its derivatives.
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Sarcoma cells growing in tissue culture have morphological and growth characteristics different than normal fibroblasts. Several of the morphological characteristics of normal fibroblasts are regained when the cells are incubated with dibutyryl-cyclic AMP or butyryl-cyclic AMP (0.1-1 mM), or cyclic
Early mitochondrial damage in the induction of haemorrhagic necrosis in the Crocker sarcoma (S 180) by endotoxin.
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Disturbances in the functional properties of tumor mitochondria have been studied during the course of induction of haemorrhage brought about by endotoxin in the murine Crocker sarcoma (S 180). Extensive impairment of function was already present in mitochondria isolated from control tumors, as
Suppression of feline immunodeficiency virus infection in vivo by 9-(2-phosphonomethoxyethyl)adenine.
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The acyclic purine nucleoside analogue 9-(2-phosphonomethoxyethyl)adenine [PMEA; formerly referred to as 9-(2-phosphonylmethoxyethyl)adenine] is a potent and selective inhibitor of human immunodeficiency virus replication in vitro and of Moloney murine sarcoma virus-induced tumor formation in mice.
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