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Página 1 a partir de 20 resultados
Origin of spindle-shaped cells in Kaposi sarcoma.
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Adult skin microvascular endothelial cells derived from new born foreskin were grown and maintained in tissue culture with and without dibutyryl cyclic AMP (DC-AMP) and isobutyl methyl xanthine (IMX). Whereas in the presence of DC-AMP and IMX, the cells showed the typical cobblestone appearance of
Enhancement of oxidative cell injury and antitumor effects of localized 44 degrees C hyperthermia upon combination with respiratory hyperoxia and xanthine oxidase.
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The effects of respiratory hyperoxia (RH) and xanthine oxidase (XO) during localized hyperthermia (HT) were investigated by determining markers of oxidative damage to lipids and proteins and tumor growth. Anesthetized rats with s.c. DS-sarcomas underwent one of the following treatments: (a)
The effect of pentoxifylline on L-1 sarcoma tumor growth and angiogenesis in Balb/c mice.
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Methyloxantines are present in many herbs and vegetal foods, among them in tea, coffee and chocolate. Previous studies revealed that theophylline and theobromine have anti-angiogenic properties. Anti-tumor properties of theobromine were also described. Pentoxifylline
Transient assay, by [3H]guanine incorporation of Escherichia coli xanthine-guanine phosphoribosyl transferase (GPT) in transfected human fibroblasts.
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We have used [3H]guanine incorporation as a rapid and sensitive assay of xanthine-guanine phosphoribosyl transferase (GPT) activity in SV40 transformed human fibroblasts. The SV40 early promoter is more efficient than the Rous sarcoma virus long terminal repeat for transient expression of the gpt
Manipulation of the ubiquitin-proteasome pathway in cachexia: pentoxifylline suppresses the activation of 20S and 26S proteasomes in muscles from tumor-bearing rats.
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The development of pharmacological approaches for preventing the loss of muscle proteins would be extremely valuable for cachectic patients. For example, severe wasting in cancer patients correlates with a reduced efficacy of chemotherapy and radiotherapy. Pentoxifylline (PTX) is a very inexpensive
Oncogenicity of purine 3-oxide and unsubstituted purine in rats.
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Injection s.c. of purine 3-oxide into Wistar rats resulted in the appearance of sarcomas and fibromas at the interscapular site of administration, carcinomas in the liver, and a high incidence of s.c. fibromas in the hip at a distance from the site of injection. A small number of liver tumors but
Impact of reactive oxygen species on the expression of adhesion molecules in vivo.
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Many non-surgical tumor treatments induce reactive oxygen species (ROS) which result in cell damage. This study investigated the impact of ROS induction on the expression of adhesion molecules and whether alpha-tocopherol pre-treatment could have a protective effect. Experimental rat DS-sarcomas
Effects of endoxan on oxidative processes in model systems in vitro.
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Endoxan (cyclophosphamide) is a cyclic propylene phosphamide ester of nitrogen mustard. Endoxan--main advantage of chemotherapy is complete penetration of the tissues, reaching the most widely spread malignant cells. It is one of the most useful cytotoxics available today. Endoxan is a "transport
IMP dehydrogenase. I. Studies on regulatory properties of crude tissue extracts based on an improved assay method.
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Inhibition of conversion from IMP to uric acid, which interferes with both spectrophotometric and radioisotopic assays of IMP dehydrogenase, by addition of allopurinol (0.1 mM), an inhibitor of xanthine oxidase, to the incubation system made it possible to determine the enzyme activity in crude
Reactive oxygen species cause direct damage of Engelbreth-Holm-Swarm matrix.
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Reactive oxygen species (ROS) are produced and released into the extracellular spaces in numerous diseases and contribute to development and progression, for example, of inflammatory diseases, proteinuria, and tumor invasion. However, little is known about ROS-induced chemical changes of
Retrovirally transduced Escherichia coli gpt genes combine selectability with chemosensitivity capable of mediating tumor eradication.
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"Suicide genes" encoding exceptional sensitivity to chemotherapeutic agents can potentially improve the selectivity of cancer therapy. As a component of a retroviral gene therapy vector, a suicide gene might also improve the safety of gene therapy by permitting the subsequent ablation of transduced
2-Methoxyestradiol enhances reactive oxygen species formation and increases the efficacy of oxygen radical generating tumor treatment.
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In an investigation of the antitumor effects of 2-methoxyestradiol (2-ME) in combination with other reactive oxygen generating treatments, 2-ME (0.5 microM) was found to completely inhibit cell proliferation of rat DS-sarcoma cells in vitro, with 71% of cells dying after exposure to 5 microM 2-ME.
Combinations of mesna with cyclophosphamide or adriamycin in the treatment of mice with tumors.
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Following therapeutic administration, cyclophosphamide and Adriamycin are biotransformed to reactive metabolites, some of which are responsible for undesirable systemic toxicities of these chemicals, whereas others are responsible for their chemotherapeutic effectiveness. Microsomal mixed function
Metexyl (4-methoxy-2,2,6,6-tetramethylpiperidine-1-oxyl) as an oxygen radicals scavenger and apoptosis inducer in vivo.
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A stable nitroxide radical named Metexyl (4-methoxy-2,2,6,6-tetramethylpiperidine-1-oxyl) was synthesized and its antioxidant and antitumor properties were investigated and compared with these of another nitroxide derivatives previously designed in our laboratories. Three experimental models were
Tempicol-2 (4-hydroxy-4-(2-picolyl)-2,2,6,6-tetramethylpiperidine-1-oxyl), a stable free radical, is a novel member of nitroxide class of antioxidants and anticancer agents.
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As a part of our studies on the chemical, biochemical and pharmacological characteristics of the newly synthesized antioxidants, nitroxide derivatives, we designed a novel nitroxide, named Tempicol-2. Its capacity to act as antioxidant of potential pharmacological application was tested in three
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