title: Innate recognition of bacteria by a macrophage cytosolic surveillance pathway.
abstract: Host recognition of bacterial pathogens is a critical component of the immune response. Intracellular bacterial pathogens are able to evade the humoral immune system by residing within the host cell. Here we show the existence of an innate host surveillance mechanism in macrophages that specifically distinguishes bacteria in the cytosol from bacteria in the vacuole. Recognition of Gram-positive and Gram-negative bacterial products by this surveillance system results in transcription of the ifnb gene. The activation of cytosol-specific signaling is associated with translocation of NF-kappaB into the nucleus and phosphorylation of the p38 mitogen-activated protein (MAP) kinase. Activation of the p38 kinase is required for the induction of gene expression by the cytosolic surveillance pathway. Our studies suggest that infection by intracellular bacterial pathogens results in an immune response distinct from that of infection by extracellular bacterial pathogens.
mesh_terms: D000818:Animals; D001412:Bacillus subtilis / Q000276:immunology; D001427:Bacterial Toxins; D002478:Cells, Cultured; D003600:Cytosol / Q000276:immunology* / Q000378:metabolism / Q000382:microbiology*; D004789:Enzyme Activation; D004926:Escherichia coli / Q000276:immunology; D005786:Gene Expression Regulation; D006090:Gram-Negative Bacteria / Q000276:immunology*; D006094:Gram-Positive Bacteria / Q000276:immunology*; D006367:HeLa Cells; D006360:Heat-Shock Proteins / Q000276:immunology; D006460:Hemolysin Proteins; D006801:Humans; D016899:Interferon-beta / Q000235:genetics; D008089:Listeria monocytogenes / Q000276:immunology; D008264:Macrophages / Q000276:immunology* / Q000378:metabolism / Q000382:microbiology*; D051379:Mice; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D016328:NF-kappa B / Q000378:metabolism; D010766:Phosphorylation; D015398:Signal Transduction; D014617:Vacuoles / Q000276:immunology / Q000382:microbiology; D048051:p38 Mitogen-Activated Protein Kinases
chemical_list: D001427:Bacterial Toxins; D006360:Heat-Shock Proteins; D006460:Hemolysin Proteins; D016328:NF-kappa B; D016899:Interferon-beta; D020928:Mitogen-Activated Protein Kinases; D048051:p38 Mitogen-Activated Protein Kinases; C038705:hlyA protein, Listeria monocytogenes