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Stranica 1 iz 292 rezultatima
Guanosine induces necrosis of cultured aortic endothelial cells.
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We have observed that treatment of cultured bovine aortic endothelial (BAE) cells with guanosine can inhibit the proliferation and viability of the cells. The addition of 500 mumol/L guanosine to the medium resulted in approximately 90% inhibition of cell proliferation. It also changed the
Stimulation of nitric oxide-cyclic guanosine monophosphate pathway in bovine ovarian theca cells by tumor necrosis factor alpha (TNF alpha). Is this pathway implicated in the TNF alpha-induced inhibition of luteinizing hormone-stimulated prorenin production?
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Gonadal function is known to be controlled by many factors, including locally acting cytokines like tumor necrosis factor alpha (TNF alpha). One of the ways this cytokine acts is via the nitric oxide (NO)-cGMP pathway. Since we have shown that in the ovary theca cells are a target of TNF alpha's
Inhibitory effects of tumor necrosis factor-alpha on migration of human periodontal ligament cells.
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BACKGROUND
Tumor necrosis factor-alpha (TNF-alpha) is associated with chronic gingival inflammation and is suspected to influence periodontal destruction. However, the exact roles of TNF-alpha in wound healing and periodontal tissue regeneration are largely unknown. In the present study, we examined
Regulation of nucleoside transport by lipopolysaccharide, phorbol esters, and tumor necrosis factor-alpha in human B-lymphocytes.
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Nucleoside transport systems and their regulation in human B-lymphocytes have been characterized using the cell lines Raji and Bare lymphoma syndrome-1 (BLS-1) as experimental models. These cells express at least three different nucleoside transport systems as follows: a
Targeting nitric oxide (NO) delivery in vivo. Design of a liver-selective NO donor prodrug that blocks tumor necrosis factor-alpha-induced apoptosis and toxicity in the liver.
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We have designed a drug that protects the liver from apoptotic cell death by organ-selective pharmacological generation of the bioregulatory agent, nitric oxide (NO). The discovery strategy involved three steps: identifying a diazeniumdiolate ion (R2N[N(O)NO]-, where R2N = pyrrolidinyl) that
Effects of botulinum toxin type D on secretion of tumor necrosis factor from human monocytes.
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Botulinum toxins are potent neurotoxins which block the release of neurotransmitters. The effects of these toxins on hematopoietic cells, however, are unknown. Monocytes secrete a variety of polypeptide growth factors, including tumor necrosis factor (TNF). In the study reported here, the effects of
Mycophenolate mofetil inhibits rat and human mesangial cell proliferation by guanosine depletion.
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BACKGROUND
Mycophenolate mofetil (MMF) is used for immunosuppression after renal transplantation because it reduces lymphocyte proliferation by inhibiting inosine monophosphate dehydrogenase (IMPDH) in lymphocytes and GTP biosynthesis. In the present study we asked if therapeutic concentrations of
Influence of cryopreservation on the sensitivity of human islets to tumor necrosis factor.
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Tumor necrosis factor (TNF alpha) has been shown to inhibit insulin release and it has been postulated to-be an important effector in islet rejection. We studied the effect of cryopreservation on glucose oxidation rate (GOR), lipid synthesis, hormone secretion (insulin, glucagon, somatostatin,
Poly-guanosine motifs costimulate antigen-reactive CD8 T cells while bacterial CpG-DNA affect T-cell activation via antigen-presenting cell-derived cytokines.
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Pathogen-derived pattern recognition ligands like lipopolysaccharide (LPS) and bacterial cytidine-guanosine (CpG)-DNA not only activate dendritic cells and macrophages but are also mitogenic for B cells. Less clear are the claimed effects of CpG-DNA on T cells, which range from direct activation,
Catecholamine antagonism of acetylcholine and dibutyrl guanosine 3',-5'-monophosphate in the mammalian ventricular myocardium.
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After chemical sympathectomy we could demonstrate a negative inotropic effect of acetylcholine (ACh) on the cat ventricular myocardium as a direct catecholamine antagonism. Dose-response relationships for isoproterenol (IP) reveal a noncompetitive inhibition of the inotropic action of the
Evidence for a cyclic guanosine monophosphate-dependent, carbon monoxide-mediated, signaling system in the regulation of TNF-alpha production by human pulmonary macrophages.
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OBJECTIVE
The second messenger cyclic guanosine 3',5'-monophosphate (cGMP) seems to be implicated in the release of tumor necrosis factor alpha (TNF-alpha) by activated macrophages. There is controversy regarding the potential of human macrophages to produce nitric oxide (NO). Since guanylate
Cytokine-induced (interleukins-3, -6 and -8 and tumour necrosis factor-beta) activation and deactivation of human neutrophils.
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The effect of various cytokines [interleukin-3(IL-3), IL-6, IL-8, tumour necrosis factor-beta (TNF-beta)] on human neutrophils (PMN) was analysed with regard to the generation of leukotrienes and the involvement of guanosine triphosphate (GTP)-binding proteins (G proteins). Incubation of
Modulation of transmembrane signalling in HL-60 granulocytes by tumour necrosis factor-alpha.
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Differentiated HL-60 granulocytes were used to study the mechanism by which tumour necrosis factor-alpha (TNF) enhances responses to N-formyl-methionyl-leucylphenylalanine (FMLP). Cultivation of differentiated HL-60 cells with 100 units of TNF/ml for 24 h resulted in a 3-fold increase in superoxide
Signal transduction by tumor necrosis factor alpha is mediated through a guanine nucleotide-binding protein in osteoblast-like cell line, MC3T3-E1.
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Transmembrane signalling mechanisms of tumor necrosis factor alpha (TNF alpha) were examined with special reference to the involvement of G-protein, in intact and permeabilized murine osteoblast-like cells. TNF alpha stimulated the release of 3H radioactivity from intact cells labeled with
Guanosine protects human neuroblastoma cells from oxidative stress and toxicity induced by Amyloid-beta peptide oligomers.
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Amyloid-beta (Abeta) peptide aggregation forms such as soluble oligomers (O) have a causal role in neuronal dysfunction and death associated with Alzheimer?s Disease (AD). The main efforts for the development of neuroprotective drugs are therefore focused on preventing Abeta production, aggregation
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