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• W2080360077 endingPage "2818" @default.
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• W2080360077 abstract "ABSTRACT An aerolysin-related cytotoxic enterotoxin (Act) of Aeromonas hydrophila possesses multiple biological activities, which include its ability to lyse red blood cells, destroy tissue culture cell lines, evoke a fluid secretory response in ligated intestinal loop models, and induce lethality in mice. The role of Act in the virulence of the organism has been demonstrated. In this study, we evaluated the potential of Act to induce production of proinflammatory cytokines associated with Act-induced tissue injury and Act's capacity to activate in macrophages arachidonic acid (AA) metabolism that leads to production of eicosanoids (e.g., prostaglandin E 2 [PGE 2 ]). Our data indicated that Act stimulated the production of tumor necrosis factor alpha and upregulated the expression of genes encoding interleukin-1β (IL-1β) and IL-6 in the murine macrophage cell line RAW264.7. Act also activated transcription of the gene encoding inducible nitric oxide synthase. Act evoked the production of PGE 2 coupled to the cyclooxygenase-2 (COX-2) pathway. AA is a substrate for PGE 2 , and Act produced AA from phospholipids by inducing group V secretory phospholipase A 2 . We also demonstrated that Act increased cyclic AMP (cAMP) production in macrophages. cAMP, along with PGE 2 , could potentiate fluid secretion in animal models because of infiltration and activation of macrophages resulting from Act-induced tissue injury. After Act treatment of RAW cells, we detected an increased translocation of NF-κB and cAMP-responsive element binding protein (CREB) to the nucleus using gel shift assays. Act also upregulated production of antiapoptotic protein Bcl-2 in macrophages, suggesting a protective role for Bcl-2 against cell death induced by proinflammatory cytokines. The increased expression of genes encoding the proinflammatory cytokines, COX-2, and Bcl-2 appeared correlated with the activation of NF-κB and CREB. This is the first report of the detailed mechanisms of action of Act from A. hydrophila ." @default.
• W2080360077 created "2016-06-24" @default.
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• W2080360077 date "2000-05-01" @default.
• W2080360077 modified "2023-10-05" @default.
• W2080360077 title "The Cytotoxic Enterotoxin of<i>Aeromonas hydrophila</i>Induces Proinflammatory Cytokine Production and Activates Arachidonic Acid Metabolism in Macrophages" @default.
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• W2080360077 doi "https://doi.org/10.1128/iai.68.5.2808-2818.2000" @default.
• W2080360077 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/97492" @default.
• W2080360077 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10768977" @default.
• W2080360077 hasPublicationYear "2000" @default.
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