title: Role of actin cytoskeleton in LPS-induced NF-kappaB activation and nitric oxide production in murine macrophages.
abstract: Lipopolysaccharide (LPS) is a major cell wall component of Gram-negative bacteria and is known to cause actin cytoskeleton reorganization in a variety of cells including macrophages. Actin cytoskeleton dynamics influence many cell signaling pathways including the NF-kappaB pathway. LPS is also known to induce the expression of many pro-inflammatory genes via the NF-kappaB pathway. Here, we have investigated the role of actin cytoskeleton in LPS-induced NF-kappaB activation and signaling leading to the expression of iNOS and nitric oxide production. Using murine macrophages, we show that disruption of actin cytoskeleton by either cytochalasin D (CytD) or latrunculin B (LanB) does not affect LPS-induced NF-kappaB activation and the expression of iNOS, a NF-kappaB target gene. However, disruption of actin cytoskeleton caused significant reduction in LPS-induced nitric oxide production indicating a role of actin cytoskeleton in the post-translational regulation of iNOS.
authors.affiliation: Centre for Infectious Disease Research and Biosafety Laboratories, Department of Microbiology and Cell Biology, Indian Institute of Science, Bangalore 560012, Karnataka, India.
authors.forename: Sandeepa M
authors.initials: SM
authors.lastname: Eswarappa
authors.forename: Vidhi
authors.initials: V
authors.lastname: Pareek
authors.forename: Dipshikha
authors.initials: D
authors.lastname: Chakravortty
mesh_terms: D000199:Actins / Q000276:immunology*; D000818:Animals; D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000494:pharmacology; D002352:Carrier Proteins / Q000187:drug effects / Q000378:metabolism*; D015638:Cytochalasin D / Q000494:pharmacology; D003599:Cytoskeleton / Q000187:drug effects / Q000276:immunology; D008070:Lipopolysaccharides / Q000276:immunology*; D017737:Macrophages, Peritoneal / Q000276:immunology*; D051379:Mice; D008810:Mice, Inbred C57BL; D016328:NF-kappa B / Q000378:metabolism*; D009363:Neoplasm Proteins / Q000187:drug effects / Q000378:metabolism*; D009569:Nitric Oxide / Q000096:biosynthesis*; D052247:Nitric Oxide Synthase Type II / Q000378:metabolism*; D015398:Signal Transduction / Q000187:drug effects; D053778:Thiazolidines / Q000494:pharmacology; D051996:Transcription Factor RelA; D048051:p38 Mitogen-Activated Protein Kinases / Q000187:drug effects / Q000378:metabolism
chemical_list: D000199:Actins; D019086:Bridged Bicyclo Compounds, Heterocyclic; D002352:Carrier Proteins; D008070:Lipopolysaccharides; D016328:NF-kappa B; D009363:Neoplasm Proteins; C498144:Rela protein, mouse; D053778:Thiazolidines; D051996:Transcription Factor RelA; D015638:Cytochalasin D; D009569:Nitric Oxide; D052247:Nitric Oxide Synthase Type II; C496317:Nos2 protein, mouse; D048051:p38 Mitogen-Activated Protein Kinases; C037068:latrunculin B