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methyl xanthine/cáncer
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Stimulation or endothelin-1 secretion by human breast cancer cells through protein kinase A activation: a possible novel paracrine loop involving breast fibroblast-derived prostaglandin E2.
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Breast cancer cells secrete endothelin-1 (ET-1), which may act as a paracrine mitogen in breast tumours. The paracrine factors and signal transduction pathways responsible for regulating ET-1 production in breast cancer are unknown. In this study we have examined the involvement of the protein
Modulation of the constitutive gene expression of the 55 kD tumor necrosis factor receptor in hematopoietic cells.
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The expression of the 55 kD human tumor necrosis factor (TNF) receptor gene was investigated. By use of a 1.2 kb cDNA we demonstrated a constitutive expression of a single 2.3 kb transcript in cell lines and fresh blood cells. The TNF receptor gene expression was not affected by phorbol esters,
Antimetastatic Action of Pentoxifylline, a Methyl Xanthine Derivative, Through its Effect on PKC Mediated Integrin Transport in B16F10 Melanoma Cells.
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UNASSIGNED
Integrins are adhesion molecules known to regulate cellular processes like adhesion, migration and proliferation. At the same time role of integrin in progress of cancer metastasis is well established, increased integrin expression is reported to be linked to high metastasis potential of
Characteristics of the accumulation of methotrexate polyglutamate derivatives in Ehrlich ascites tumor cells and isolated rat hepatocytes.
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The intracellular synthesis and retention of polygammaglutamyl derivatives of methotrexate and their interactions with H2 folate reductase was evaluated in the Ehrlich ascites tumor cell and the isolated rat hepatocyte. Methotrexate polyglutamates were detected within 15 minutes in hepatocytes
Prospective randomized trial of lisofylline for the prevention of toxicities of high-dose interleukin 2 therapy in advanced renal cancer and malignant melanoma.
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The therapeutic application of high-dose interleukin (IL) 2 in human malignancy is limited by severe multiorgan toxicities that are mediated, in part, by tumor necrosis factor (TNF) and IL-1. CT1501R (lisofylline; LSF) is one of several methyl xanthine congeners that inhibit the effects of TNF by
Enhanced anticancer efficacy of histone deacetyl inhibitor, suberoylanilide hydroxamic acid, in combination with a phosphodiesterase inhibitor, pentoxifylline, in human cancer cell lines and in-vivo tumor xenografts.
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Vorinostat [suberoylanilide hydroxamic acid (SAHA)], a histone deacetylase inhibitor, shows limited clinical activity against solid tumors when used alone. The methyl xanthine drug, pentoxifylline (PENT), has been described to have antitumor properties. The aim of this study was to look for the
Characterization of the release of cholecystokinin from a murine neuroendocrine tumor cell line, STC-1.
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The murine neuroendocrine cell line, STC-1, was found to contain 296.8 +/- 1.8 fmol of cholecystokinin-like immunoreactivity (CCK-LI) per mg cell protein. Immunocytochemical stain of STC-1 cells maintained in monolayer culture indicated that CCK-LI activity was present in 93% of the cells. Analysis
12-0-tetradecanoylphorbol-13-acetate and concanavalin A enhance glucose uptake in thymocytes by different mechanisms.
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The effects of the tumor promoter 12-0-tetradecanoylphorbol-13-acetate (TPA) and the plant lectin concanavalin A (Con A) on glucose uptake in murine thymocytes were studied. TPA induces a rapid dose-dependent increase in the uptake of 2-deoxyglucose and in the transport of 3-0-methylglucose. Con A
Induced melanin reduces mutations and cell killing in mouse melanoma.
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When melanin absorbs light energy, it can produce potentially damaging active oxygen species. There is little doubt that constitutive pigment in dark-skinned individuals is photoprotective against skin cancer, but induced pigment-as in tanning-may not be. The first step in cancer induction is
Simultaneous estimation of lisofylline and pentoxifylline in rat plasma by high performance liquid chromatography-photodiode array detector and its application to pharmacokinetics in rat.
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Lisofylline (LSF) is an anti-inflammatory and immunomodulatory agent with proven activity in serious infections associated with cancer chemotherapy, hyperoxia-induced acute lung injury, autoimmune disorders including type-1 diabetes (T1DM) and islet rejection after islet transplantation. It is also
Activation of transcriptionally inactive human estrogen receptors by cyclic adenosine 3',5'-monophosphate and ligands including antiestrogens.
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We show that some transcriptionally inactive human estrogen receptor (ER) mutants can be activated by 17 beta-estradiol (E2), and sometimes by antiestrogens, in the presence of elevated levels of intracellular cAMP. ER-deficient Chinese hamster ovary or 3T3 mouse fibroblast cells were transfected
Cyclic nucleotides, thioldisulfide status of proteins, and cellular control processes.
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It is shown that cyclic nucleotides can have a variety of effects on cell division, cell shape, cell adhesion, and cell movement, depending on the cells selected and the conditions under which they are used. For example, while CHO cells elongate under the influence of exogenous dibutyryl CAMP, Y-1
Cyclic AMP modulation of Fc receptor expression on a pre-B cell lymphoma.
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Cyclic AMP-elevating agents have been shown to increase the expression of Fc receptors on the Abelson virus-induced pre-B cell tumor ABE-8. Such agents included isoproterenol, PGE1, 3-isobutyl-1-methyl xanthine, and 8 BrcAMP. The positive inductive effect produced by these agents was inhibited by 8
ATM as a target for novel radiosensitizers.
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DNA damage checkpoints are complex signal transduction pathways that are critical for normal cellular recovery following potentially lethal genotoxic insults. The ataxia-telangiectasia mutated (ATM) protein kinase is a critical component in these pathways and integrates the cellular response to
Differential regulation of IL 6, IL 1 A, IL 1 beta and TNF alpha production in LPS-stimulated human monocytes: role of cyclic AMP.
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Interleukin 6 (IL 6), IL 1 alpha, IL beta and tumor necrosis factor (TNF) alpha are four cytokines induced in monocytes by lipopolysaccharide (LPS); however, it is unclear whether the mechanisms which control their production are similar. In this study, we report the effects of prostaglandin E2
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