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Interleukin-6 production by endothelial cells via stimulation of protease-activated receptors is amplified by endotoxin and tumor necrosis factor-alpha.
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Human endothelial cells respond to extracellular proteases, endotoxin (lipopolysaccharide, LPS), and inflammatory cytokines. Endothelial cells express several protease-activated receptors (PAR), including the thrombin-activated receptors PAR-1 and PAR-3 and a thrombin-independent, protease-activated
The apoptosis-necrosis paradox. Apoptogenic proteases activated after mitochondrial permeability transition determine the mode of cell death.
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Mitochondrial alterations including permeability transition (PT) constitute critical events of the apoptotic cascade and are under the control of Bcl-2 related gene products. Here we show that induction of PT is sufficient to activate CPP32-like proteases with DEVDase activity and the associated
Tumor necrosis factor-alpha (TNF-alpha) regulates shedding of TNF-alpha receptor 1 by the metalloprotease-disintegrin ADAM8: evidence for a protease-regulated feedback loop in neuroprotection.
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Tumor necrosis factor alpha (TNF-alpha) is a potent cytokine in neurodegenerative disorders, but its precise role in particular brain disorders is ambiguous. In motor neuron (MN) disease of the mouse, exemplified by the model wobbler (WR), TNF-alpha causes upregulation of the
Gabexate mesilate, a synthetic protease inhibitor, attenuates endotoxin-induced pulmonary vascular injury by inhibiting tumor necrosis factor production by monocytes.
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OBJECTIVE
In order to determine whether gabexate mesilate, a synthetic protease inhibitor with anticoagulant properties, is useful for the treatment of adult respiratory distress syndrome, we examined its effect on endotoxin-induced pulmonary vascular injury in rats.
METHODS
Prospective, randomized,
Protease-activated receptor-1 antagonist F 16618 reduces arterial restenosis by down-regulation of tumor necrosis factor α and matrix metalloproteinase 7 expression, migration, and proliferation of vascular smooth muscle cells.
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Wound healing after angioplasty or stenting is associated with increased production of thrombin and the activation of protease-activated receptor 1 (PAR1). The aim of the present study was to examine the effects of a new selective PAR1 antagonist,
Alpha 1-antitrypsin and protease complexation is induced by lipopolysaccharide, interleukin-1beta, and tumor necrosis factor-alpha in monocytes.
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Local regulation of alpha1-antitrypsin (alpha1-AT) may have importance in maintenance of the protease-antiprotease balance in the microenvironment of inflammatory cells. We therefore studied whether lipopolysaccharide (LPS), interleukin-1beta (IL-1beta), and tumor necrosis factor-alpha (TNFalpha)
Biochemical pathways of apoptosis: nicotinamide adenine dinucleotide-deficient cells are resistant to tumor necrosis factor or ultraviolet light activation of the 24-kD apoptotic protease and DNA fragmentation.
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The function of nicotinamide adenine dinucleotide (NAD) and adenosine diphosphate (ADP) ribosylation reactions in the mechanism of apoptotic cell death is controversial, although one theory postulates an essential role for NAD depletion by poly-ADP-ribose polymerase. The present study examined the
Monocytic cell necrosis is mediated by potassium depletion and caspase-like proteases.
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Apoptosis is a physiological cell death that culminates in mitochondrial permeability transition and the activation of caspases, a family of cysteine proteases. Necrosis, in contrast, is a pathological cell death characterized by swelling of the cytoplasm and mitochondria and rapid plasma membrane
In vivo evidence for protease-catalysed mechanism providing bioactive tumor necrosis factor alpha.
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Mice pretreated by intravenous injection of 42 mg/kg of the serine protease inhibitor alpha 1-antitrypsin prior to a hepatotoxic dose of D-galactosamine/lipopolysaccharide (GalN/LPS) were fully protected against hepatitis. Pretreatment with alpha 1-antitrypsin with doses up to 300 mg/kg at different
Avascular necrosis of both femoral heads in an HIV-infected patient receiving protease inhibitors.
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Several adverse effects have been reported under antiretroviral therapy containing protease inhibitors. We report a further case of avascular necrosis of both femoral heads in an HIV-infected patient treated with protease inhibitor containing antiretroviral therapy.
Involvement of a serine protease in tumour-necrosis-factor-mediated cytotoxicity.
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We investigated the effect of various protease inhibitors on the anti-proliferative and cytotoxic action of tumour necrosis factor (TNF) on mouse L929 fibrosarcoma cells. 1. The following serine-type protease inhibitors led to inhibition of TNF action: phenylmethylsulfonyl fluoride, N
Activation of the CED3/ICE-related protease CPP32 in cerebellar granule neurons undergoing apoptosis but not necrosis.
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Neuronal apoptosis occurs during nervous system development and after pathological insults to the adult nervous system. Inhibition of CED3/ICE-related proteases has been shown to inhibit neuronal apoptosis in vitro and in vivo, indicating a role for these cysteine proteases in neuronal apoptosis. We
Induction of the mitochondrial permeability transition by protease activity in rats: a mechanism of hepatocyte necrosis.
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OBJECTIVE
The mitochondrial membrane permeability transition (MMPT) has been proposed as a mechanism of cell necrosis. In contrast, it has been suggested that enhanced activity of calpain-like proteases causes cell necrosis. To integrate these concepts, the hypothesis that stimulation of
Tumor necrosis factor-α and receptor activator of nuclear factor-κB ligand augment human macrophage foam-cell destruction of extracellular matrix through protease-mediated processes.
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By secreting proteases such as cathepsins and matrix metalloproteinases (MMPs), macrophage foam cells may be a major cause of ruptured atherosclerotic plaques. The aims of the present study were to investigate in vitro role of human macrophage foam cells in degrading type I collagen, a major
Synthesis of the infectious pancreatic necrosis virus polyprotein, detection of a virus-encoded protease, and fine structure mapping of genome segment A coding regions.
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Full-length and truncated genome segment A-specific infectious pancreatic necrosis virus cDNA was subcloned into plasmid transcription vectors, and runoff transcripts were produced in vitro. These transcripts were translated in cell-free rabbit reticulocyte lysates and the translation products were
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