NDLI: Human Endothelial Cell Activation and Mediator Release in Response to Listeria monocytogenes Virulence Factors

Content Provider	PubMed Central
Author	Rose, Frank Zeller, Sven-arne Chakraborty, Trinad Domann, Eugen Machleidt, Thomas Kronke, Martin Seeger, Werner Grimminger, Friedrich Sibelius, Ulf
Editor	Moore, R. N.
Copyright Year	2001
Abstract	The interaction of Listeria monocytogenes with endothelial cells represents a crucial step in the pathogenesis of listeriosis. Incubation of human umbilical vein endothelial cells (HUVEC) with wild-type L. monocytogenes (EGD) provoked immediate strong NO synthesis, attributable to listerial presentation of listeriolysin O (LLO), as the NO release was missed upon employment of a deletion mutant for LLO (EGD hly mutant) and was reproduced by purified LLO. Studies of conditions lacking extracellular Ca2+ suggested LLO-elicited Ca2+ flux as the underlying mechanism. In addition, HUVEC incubation with EGD turned out to be a potent stimulus for sustained (>12-h) upregulation of proinflammatory cytokine generation (interleukin 6 [IL-6], IL-8, and granulocyte-macrophage colony-stimulating factor). Use of deletion mutants for LLO (EGD hly mutant), listerial phosphatidylinositol-specific phospholipase C (EGD plcA mutant), broad-spectrum phospholipase C (EGD plcB mutant) and internalin B (EGD inlB mutant), as well as purified LLO, identified LLO as largely responsible for the cytokine response. Endothelial cells responded with diacylglycerole and ceramide generation as well as nuclear translocation of NF-κB to the stimulation with the LLO-producing strains EGD and Listeria innocua. The endothelial PC-phospholipase C inhibitor tricyclodecan-9-yl-xanthogenate as well as two independent inhibitors of NF-κB activation, pyrolidine dithiocarbamate and caffeic acid phenethyl ester, suppressed both the NF-κB translocation and the upregulation of cytokine synthesis. We conclude that L. monocytogenes is a potent stimulus of NO release and sustained upregulation of proinflammatory cytokine synthesis in human endothelial cells, both events being largely attributable to LLO presentation. LLO-induced transmembrane Ca2+ flux as well as a sequence of endothelial phospholipase activation and the appearance of diacylglycerole, ceramide, and NF-κB are suggested as underlying host signaling events. These endothelial responses to L. monocytogenes may well contribute to the pathogenic sequelae in severe listerial infection and sepsis.
Related Links	http://dx.doi.org/10.1128/IAI.69.2.897-905.2001
Starting Page	897
File Format	PDF
ISSN	10985522
e-ISSN	10985522
Journal	Infection and Immunity
Issue Number	2
Volume Number	69
Language	English
Publisher	American Society for Microbiology
Publisher Date	2001-02-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Infectious Diseases Parasitology Immunology Microbiology

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