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Strana 1 od 24 výsledky
Synthetic matrix metalloproteinase inhibitors and tissue inhibitor of metalloproteinase (TIMP)-2, but not TIMP-1, inhibit shedding of tumor necrosis factor-alpha receptors in a human colon adenocarcinoma (Colo 205) cell line.
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The solubilization of plasma membrane receptors through proteolytic cleavage of the ligand binding domain at the cell surface is an important mechanism for regulating cytokine function and receptor signaling. The inhibition of the shedding of a variety of receptors by synthetic inhibitors of the
Aryl hydrocarbon receptor modulation of tumor necrosis factor-alpha-induced apoptosis and lysosomal disruption in a hepatoma model that is caspase-8-independent.
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Recent studies suggest that the aryl hydrocarbon receptor (AhR) modulates susceptibilities to some pro-apoptotic agents. AhR-containing murine hepatoma 1c1c7 cultures underwent apoptosis following exposure to tumor necrosis factor-alpha (TNFalpha) + cycloheximide (CHX). In contrast, Tao cells, an
Acute hemorrhagic pancreatic necrosis in mice. Effects of proteinase inhibitors on its induction.
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An acute hemorrhagic pancreatitis with fat necrosis (AHPN) was induced in female mice fed a choline-deficient diet containing 0.5% DL-ethionine. The effect of various proteinase inhibitors on the induction of the pancreatitis was evaluated using three parameters, the mortality of the animals, the
'Partitagin' a hemorrhagic metalloprotease from Hippasa partita spider venom: role in tissue necrosis.
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The poisonous bite by Hippasa partita, a funnel web spider from the Indian subcontinent has been demonstrated to give rise to severe dermo- and myonecrosis. In this work a hemorrhagic metalloprotease, Partitagin was purified from H. partita venom by successive chromatography on Sephadex G-100, DEAE
Candida albicans-secreted aspartic proteinases modify the epithelial cytokine response in an in vitro model of vaginal candidiasis.
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Secreted aspartyl proteinases (Saps) are important virulence factors of Candida albicans during mucosal and disseminated infections and may also contribute to the induction of an inflammatory host immune response. We used a model of vaginal candidiasis based on reconstituted human vaginal epithelium
Characterization of endothelin-converting enzyme activities in ARPE-19 cells, a human retinal pigmented epithelial cell line.
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Elevated endothelin-1 (ET-1) levels are detected in patients with glaucoma. ET-1 is produced from its precursor, Big ET-1, by endothelin-converting enzyme (ECE). Characterization of ET- 1 secretion and ECE activity was performed in ARPE-19 cells, a human retinal pigmented epithelial cell-line. The
Proteases inhibition assessment on PC12 and NGF treated cells after oxygen and glucose deprivation reveals a distinct role for aspartyl proteases.
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Hypoxia is a severe stressful condition and induces cell death leading to neuronal loss both to the developing and adult nervous system. Central theme to cellular death is the activation of different classes of proteases such as caspases calpains and cathepsins. In the present study we investigated
Suppressive effects of peptide antibiotics against proliferation and cytokine production in mitogen-activated human peripheral-blood mononuclear cells.
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Certain kinds of peptide antibiotics are suggested to have immunomodulatory effects; however, few studies have been carried out systemically to evaluate the antiproliferative effects of peptide antibiotics in human lymphoid cells. The suppressive efficacies of nine peptide antibiotics and seven
Lysosomal enzymuria is a feature of hereditary Fanconi syndrome and is related to elevated CI-mannose-6-P-receptor excretion.
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BACKGROUND
Lysosomal enzymuria is usually considered to be a non-specific marker of renal injury, but little is known about lysosomal enzyme excretion in renal proximal tubular cell disorders such as the renal Fanconi syndrome (FS). We examined excretion of two lysosomal enzymes and the
Caspase-8-mediated apoptosis induced by oxidative stress is independent of the intrinsic pathway and dependent on cathepsins.
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Cell-death programs executed in the pancreas under pathological conditions remain largely undetermined, although the severity of experimental pancreatitis has been found to depend on the ratio of apoptosis to necrosis. We have defined mechanisms by which apoptosis is induced in pancreatic acinar
Changes induced in astrocyte cathepsin D by cytokines and leupeptin.
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Cathepsin D is widely, but unevenly, distributed among cells and is capable of degrading a number of neural peptides and proteins. The present study was undertaken to examine the level of cathepsin D in astrocytes that might be relevant to its induction in inflammatory demyelination. Primary
Apoptosis of phagocytic cells induced by Candida albicans and production of IL-10.
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Macrophages co-incubated with Candida albicans strain CR1 in vitro showed early signs of apoptosis, but evolved to necrosis after 2 h. In this study, we investigated whether strain CR1 caused apoptosis or necrosis of macrophages after its inoculation into mice peritoneal cavity, and whether this
TNF-alpha-induced matrix Fn disruption and decreased endothelial integrity are independent of Fn proteolysis.
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Exposure of confluent pulmonary arterial endothelial monolayers to tumor necrosis factor (TNF)-alpha causes both a reorganization and/or disruption of fibronectin (Fn) in the extracellular matrix and an increase in transendothelial protein permeability. However, the factors initiating this response
Sequence-dependent cytotoxicity of second-generation oligonucleotides.
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In this study, we have examined the potential of second-generation antisense chimeric 2'-O-(2-methoxy)ethyl/DNA phosphorothioate oligonucleotides (ONs) to affect cell growth through non-antisense mechanisms. Evaluation of a series of ONs demonstrated that only a small number were cytotoxic at
Involvement of cathepsin D in chemotherapy-induced cytochrome c release, caspase activation, and cell death.
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Treatment of cells with chemotherapy drugs activates the intrinsic mitochondrial pathway of apoptosis and the caspase protease cascade. Recently, the lysosomal protease cathepsin D has been implicated in apoptosis caused by oxidative stress, inhibition of protein kinase C, and stimulation of the
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