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Σελίδα 1 από 27 Αποτελέσματα
Amine oxidase, spermine, and hyperthermia induce cytotoxicity in P-glycoprotein overexpressing multidrug resistant Chinese hamster ovary cells.
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Multidrug resistance is a major obstacle for the successful use of chemotherapy. The multidrug resistance phenotype is often attributed to overexpression of P-glycoprotein, which is an energy-dependent drug efflux pump. We investigated a new strategy to overcome multidrug resistance, using purified
Hyperthermia enhances cytotoxicity of amine oxidase and spermine on drug-resistant LoVo colon adenocarcinoma cells.
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Hyperthermia is currently receiving widespread attention when associated with other therapeutic modalities, such as irradiation or chemotherapy, in the treatment of cancer. The occurrence of resistance to cytotoxic pharmacological agents in tumor cells, associated with several phenotypic
Synthesis and application of magnetite dextran-spermine nanoparticles in breast cancer hyperthermia.
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Cancer treatment has been very challenging in recent decades. One of the most promising cancer treatment methods is hyperthermia, which increases the tumor temperature (41-45 °C). Magnetic nanoparticles have been widely used for selective targeting of cancer cells. In the present study, magnetic
Effect of hyperthermia on spermidine/spermine N1-acetyltransferase activity in Ehrlich ascites cells.
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When Ehrlich ascites tumor cells were incubated at 42 degrees C, the activity of spermidine/spermine N1-acetyltransferase, a rate-limiting enzyme of polyamine biodegradation, decreased to 20% of the control level within 1 hr. Protein synthesis, judged from the incorporation of [3H]leucine into the
Polyamine biosynthesis inhibitors combined with systemic hyperthermia in cancer therapy.
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A Phase I clinical trial has been initiated at the University of Arizona Cancer Center which combines escalating oral doses of the polyamine biosynthesis inhibitor alpha-difluoromethylornithine (DFMO), with systemic hyperthermia (approximately 41.5 degrees C) in the treatment of metastatic melanoma.
Analysis of the spermine synthase gene region in Fugu rubripes, Tetraodon fluviatilis, and Danio rerio.
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A prerequisite to understanding the evolution of the human X chromosome is the analysis of synteny of X-linked genes in different species. We have focused on the spermine synthase gene in human Xp22. 1. We show that whereas the human gene spans a genomic region of 54 kb, the Fugu rubripes gene is
Spermine metabolism and radiation-derived reactive oxygen species for future therapeutic implications in cancer: an additive or adaptive response.
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Destruction of cells by irradiation-induced radical formation is one of the most frequent interventions in cancer therapy. An alternative to irradiation-induced radical formation is in principle drug-induced formation of radicals, and the formation of toxic metabolites by enzyme catalyzed reactions.
Phosphorylation-dephosphorylation of nuclear proteins during infection (Q fever).
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The proposal that gene expression may be regulated by phosphorylation of nonhistone chromatin proteins was tested by studying increased transcription resulting from Q fever. Certain liver nuclear phosphoprotein kinase and phosphatase activities were altered after guinea pigs were infected with
Mitochondrial calcium transport and calcium-activated phospholipase in porcine malignant hyperthermia.
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The interaction of Ca2+ with mitochondria isolated from longissismus dorsi, a predominantly white skeletal muscle, of normal and malignant hyperthermia pigs was investigated using tightly-coupled preparations. Arrhenius plots of mitochondrial Ca2+ -stimulated respiration for succinate oxidation of
Polyamines and polyamine biosynthesis in cells exposed to hyperthermia.
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The issue of how polyamines act to sensitize cultured cells to the lethal effects of hyperthermia was investigated using Chinese hamster cells which were induced to express thermotolerance. Intracellular levels of these naturally occurring polycations were manipulated in certain situations by
Temporal studies of factors associated with changes in transcription during Q fever.
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Temporal studies were made of factors associated with increased RNA synthesis in guinea pig liver during Q fever. DNA-dependent RNA polymerase activities increased immediately after infection. The major distribution of RNA polymerase classes shifted from class II to class I during infection.
Evidence against putrescine and polyamines as endogenous mediators of fever.
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Endogenous concentrations of putrescine, spermidine, spermine and related biosynthetic enzymes were not affected by the administration of bacterial endotoxin and the subsequent development of fever in rabbits. In addition, the febrile response to endotoxin was unaffected either by the ornithine
Polyamine patterns in plasma of patients with systemic lupus erythematosus and fever.
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Systemic lupus erythematosus (SLE) is a systemic autoimmune disease with various clinical manifestations and serologic markers. In this study, we analyzed nine polyamine (PA) profiles of plasma from patients with SLE and healthy controls (HCs), and the relationship between the PA profiles and
Cytotoxicity and kinetic analysis of purified bovine serum amine oxidase in the presence of spermine in Chinese hamster ovary cells.
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Bovine serum amine oxidase (BSAO, EC 1.4.3.6) catalyzes the oxidative deamination of polyamines giving rise to the corresponding aldehydes, ammonia and hydrogen peroxide (H2O2). This study demonstrates that amine oxidase (BSAO) purified from bovine serum and exogenous spermine caused cytotoxicity in
Heat enhancement of cytotoxicity induced by oxidation products of spermine in Chinese hamster ovary cells.
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This study investigates the potential of using polyamines as thermosensitizers, in the presence of bovine serum amine oxidase (BSAO), as a new anticancer strategy. The effect of hyperthermia on cytotoxicity of spermine oxidized by purified bovine serum amine oxidase was investigated in Chinese
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