Original Literature | Model OverView |
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Publication
Title
Tolerance to pyrogens.
Affiliation
Physiologisches Institut, Klinikum der Justus Liebig Universitat Giessen,Germany. eugen.zeisberger@physiologie.med.uni-giessen.de
Abstract
In humans or experimental animals, the repeated confrontation withlipopolysaccharides (LPS) from gram-negative bacteria, but not with muramyldipeptide (MDP) from gram-positive bacteria, leads to attenuation of almost allpathophysiologic effects mediated by proinflammatory cytokines. Our experimentsin guinea pigs and rats demonstrate that attenuation of the febrile responseduring the development of LPS tolerance is associated with a reduced productionof cytokines rather than a decrease in responsiveness to cytokines.Cross-tolerance experiments demonstrate that different stimuli influencingLPS-induced tumor necrosis factor (TNF) release and nitric oxide (NO) synthesiscan modify the development of tolerance. On the other hand, the lack ofcross-tolerance between LPS and MDP indicates that MDP can activate the cytokinecascade and induce the febrile response in animals tolerant to LPS. This mayindicate distinct receptors and signal pathways for LPS and MDP, leading toactivation of the cytokine cascade. LPS tolerance has also been demonstrated inex vivo and in vitro studies. In cultures of monocytes, diminished synthesis ofTNF and NO reported after LPS restimulation could be prevented and reversed byinterferon and granulocyte-macrophage colony-stimulating factor. These findingsadd an additional hypothesis in tolerance development.
PMID
9917872
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PMID: 9917872, 1916089 The LPS binding protein belongs to the acute-phase proteins, and during infection high concentration of the complex between LPS and its binding protein can be formed.
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PMID: 9917872, 8330898 The LPS stimulated induction of NFkappaB in the nucleus is essential for expression of cytokine genes, such as TNF, IL-1 and IL-6, with the consequent transcription and translation of these genes.
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PMID: 9917872, 8330898 The LPS stimulated induction of NFkappaB in the nucleus is essential for expression of cytokine genes, such as TNF, IL-1 and IL-6, with the consequent transcription and translation of these genes.
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PMID: 9917872, 8482846 MDP was a potent inducer of TNF mRNA expression. PMID: 9917872 LPS stimulation in tolerant monocytes and macrophages consists of p50p50 homodimers that blocks transactivation of the TNF gene.
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PMID: 9917872, 9242715 MDP always results in identical circulation levels of TNF and IL-6.
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PMID: 9917872, 8330898 The LPS stimulated induction of NFkappaB in the nucleus is essential for expression of cytokine genes, such as TNF, IL-1 and IL-6, with the consequent transcription and translation of these genes.
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PMID: 9917872, 8330898 The LPS stimulated induction of NFkappaB in the nucleus is essential for expression of cytokine genes, such as TNF, IL-1 and IL-6, with the consequent transcription and translation of these genes. PMID: 9917872 Daily injection of LPS in rats resulted in a measurable increase in the release of TNF, IL-1beta and IL-6 after the first injection.
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PMID: 9917872 Daily injection of LPS in rats resulted in a measurable increase in the release of TNF, IL-1beta and IL-6 after the first injection.
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PMID: 9917872 Daily injection of LPS in rats resulted in a measurable increase in the release of TNF, IL-1beta and IL-6 after the first injection.
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PMID: 9917872 LPS stimulation in tolerant monocytes and macrophages consists of p50p50 homodimers that blocks transactivation of the TNF gene.1.LPS stimulation in tolerant monocytes and macrophages consists of p50p50 homodimers that blocks transactivation of the TNF gene.
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PMID: 9917872, 7537790 The complex of LPS/LPS-binding protein is bound to a soluble form of the CD14 receptor.
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PMID: 9917872, 8330898 The LPS stimulated induction of NFkappaB in the nucleus is essential for expression of cytokine genes, such as TNF, IL-1 and IL-6, with the consequent transcription and translation of these genes.
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PMID: 9917872, 8522354 MDP also results in induction of NFkappaB and its translocation in nucleus.
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PMID: 9917872 The next step in LPS-induced cell activation is the interaction between the LPS/LPS-binding protein complex to its CD14 receptor.
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PMID: 9917872, 8330898 The LPS stimulated induction of NFkappaB in the nucleus is essential for expression of cytokine genes, such as TNF, IL-1 and IL-6, with the consequent transcription and translation of these genes.
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PMID: 9917872, 8330898 The LPS stimulated induction of NFkappaB in the nucleus is essential for expression of cytokine genes, such as TNF, IL-1 and IL-6, with the consequent transcription and translation of these genes.
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PMID: 9917872, 8522354 MDP also results in induction of NFkappaB and its translocation in nucleus.
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PMID: 9917872, 8330898 The LPS stimulated induction of NFkappaB in the nucleus is essential for expression of cytokine genes, such as TNF, IL-1 and IL-6, with the consequent transcription and translation of these genes.
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PMID: 9917872, 8330898 The LPS stimulated induction of NFkappaB in the nucleus is essential for expression of cytokine genes, such as TNF, IL-1 and IL-6, with the consequent transcription and translation of these genes. PMID: 9917872 LPS stimulation in tolerant monocytes and macrophages consists of p50p50 homodimers that blocks transactivation of the TNF gene.
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PMID: 9917872, 8330898 The LPS stimulated induction of NFkappaB in the nucleus is essential for expression of cytokine genes, such as TNF, IL-1 and IL-6, with the consequent transcription and translation of these genes. PMID: 9917872 Daily injection of LPS in rats resulted in a measurable increase in the release of TNF, IL-1beta and IL-6 after the first injection.
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