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Enhancement of radical intensity and cytotoxic activity of ascorbate by hyperthermia.
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ESR spectroscopy revealed that the radical intensity of sodium ascorbate and ascorbic acid was significantly higher under hyperthermic conditions. The enhancement of ascorbyl radical intensity was coupled with the accelerated degradation of ascorbate and cytotoxicity induction against human leukemic
Enhanced inhibition of DNA synthesis and release of membrane phospholipids in tumour cells treated with a combination of acylated ascorbate and hyperthermia.
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Combined antitumour effects of mono- or diacyl ascorbates and heat treatment were studied in comparison with the parent compound, L-ascorbic acid (AsA). At 37 degrees C, 75 microM 6-O-palmitoyl (6P) and 6-O-stearoyl (6S) ascorbates appreciably inhibited DNA synthesis in Ehrlich ascites tumour cells.
Promotive action of acylated ascorbate on cellular DNA synthesis and growth at low doses in contrast to inhibitory action at high doses or upon combination with hyperthermia.
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Effects of 6-O-palmitoyl ascorbate (ascorbate) developed to increase the antitumour activity of ascorbic acid on DNA synthesis and proliferation of Ehrlich ascites tumour cells were investigated. Treatment of the cells with the acylated ascorbate at 25-50 microM for 1 h resulted in no effect on DNA
Carcinostatic effects of diverse ascorbate derivatives in comparison with aliphatic chain moiety structures: Promotion by combined hyperthermia and reduced cytotoxicity to normal cells.
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In this study, using human tongue squamous carcinoma cells (HSC-4) carcinostatic activity was compared for diverse L-ascorbic acid (Asc) derivatives, including the 'straight-C(16)-chain types', 6-O-palmitoyl-Asc (A6-P) and Asc-2-phosphate-6-O-palmitate sodium salt (APPS), as well as the
Abnormal cell morphology and cytotoxic effect are induced by 6-0-palmitol-ascorbate-2-0-phosphate, but not by ascorbic acid or hyperthermia alone.
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A new derivative of ascorbic acid (AsA), 6-0-palmitoyl-ascorbate 2-0-phosphate (Asc2P6Pal) was developed to enhance the antitumor activity of AsA. When Ehrlich ascites tumor cells were treated with 50 microM Asc2P6Pal at 37 degrees C or 42 degrees C for 1 h and then cultured for 20 h, most of cells
Therapeutic treatment with ascorbate rescues mice from heat stroke-induced death by attenuating systemic inflammatory response and hypothalamic neuronal damage.
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The impact of ascorbate on oxidative stress-related diseases is moderate because of its limited oral bioavailability and rapid clearance. However, recent evidence of the clinical benefit of parenteral vitamin C administration has emerged, especially in critical care. Heatstroke is defined as a form
[Results of preoperative autotransfusion with ferrous ascorbate prophylaxis in orthopedic surgery patients].
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OBJECTIVE
Restrictive erythropoiesis caused by iron deficiency may hinder pre-deposit autotransfusion in surgical procedures. In order to evaluate the response to prophylactic ferrous ascorbate, a prospective study was conducted on patients subjected to orthopaedic surgery and
Effect of hyperthermia and lipid peroxidation on the erythrocyte membrane structure.
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The hyperthermic exposure (39-49 degrees C) of human erythrocyte membranes augmented their lipid peroxidation stimulated by 0.1 mM FeCl3 + 1.5 mM ascorbate while having no significant influence on the non-stimulated lipid peroxidation. No effect of hyperthermia and lipid peroxidation on the
Effect of hyperthermia on electron transport in Ehrlich ascites tumor mitochondria.
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The effect of hyperthermia (1 hr, 41 degrees C) on the functional properties of Ehrlich ascites tumor mitochondria was investigated. Mitochondria isolated from Ehrlich ascites tumor after exposure of whole cells to 41 degrees C for 1 hr still phosphorylate and maintain a normal acceptor control
Increasing Superoxide Production and the Labile Iron Pool in Tumor Cells may Sensitize Them to Extracellular Ascorbate.
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Low millimolar concentrations of ascorbate are capable of inflicting lethal damage on a high proportion of cancer cells lines, yet leave non-transformed cell lines unscathed. Extracellular generation of hydrogen peroxide, reflecting reduction of molecular oxygen by ascorbate, has been shown to
Delayed ascorbate bolus protects against maldistribution of microvascular blood flow in septic rat skeletal muscle.
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OBJECTIVE
Although early administration of ascorbate has been shown to protect against the microvascular dysfunction in sepsis, it is not clear if a delayed introduction of ascorbate also yields beneficial effects. The main objective was to determine the therapeutic window for treatment of an animal
Differential effect of alpha-tocopherol and ascorbate on oxidative injury induced in immune cells by thermal stress.
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As immune cells are often subjected to hyperthermia that can easily occur either after intense and/or prolonged exercise or during defense against pathogens, in this paper we analysed whether superoxide anion production occurred in lymphocytes exposed to high temperature and, consequently, if
[Signal function of cytokinin 6-benzylaminopurine in the reaction of Triticum aestivum L. mesophyll cells to hyperthermia].
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The signaling effect of 6-benzylaminopurine (BAP) on leaf mesophyll cells of Triticum aestivum L. under hyperthermic conditions was studied. It was found that BAP regulated photosynthetic pigment, hydrogen peroxide content and activity of antioxidant enzymes, namely superoxide dismutase, ascorbate
Anticancer effects of 6-o-palmitoyl-ascorbate combined with a capacitive-resistive electric transfer hyperthermic apparatus as compared with ascorbate in relation to ascorbyl radical generation.
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The aim of the present study is to determine the anti-proliferative activity of 6-o-palmitoyl-L: -ascorbic acid (Asc6Palm) that is a lipophilic derivative of L: -ascorbic acid (Asc), on human tongue squamous carcinoma HSC-4 cells by combined use of hyperthermia in comparison to Asc. Asc6Palm or Asc
Regression of an aggressive abdominal desmoid tumor in a patient with familial adenomatous polyposis by hyperthermoradiotherapy.
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A case of huge desmoid tumor successfully treated by hyperthermoradiotherapy is described. A 23-year-old man with familial adenomatous polyposis was operated upon for a desmoid tumor in the mesenterium involving the right kidney and small intestine in 1988. In 1990, the tumor recurred and could not
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