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Cutting Edge |


*
Epithelial Pathobiology Division, Department of Pathology and Laboratory Medicine, Emory University, Atlanta, GA 30322; and
Department of Molecular Biology, Genentech, Inc., South San Francisco, CA 94080
Flagellin, the structural component of bacterial flagella, is
secreted by pathogenic and commensal bacteria. Flagellin activates
proinflammatory gene expression in intestinal epithelia. However, only
flagellin that contacts basolateral epithelial surfaces is
proinflammatory; apical flagellin has no effect. Pathogenic
Salmonella, but not commensal Escherichia
coli, translocate flagellin across epithelia, thus activating
epithelial proinflammatory gene expression. Investigating how epithelia
detect flagellin revealed that cell surface expression of Toll-like
receptor 5 (TLR5) conferred NF-
B gene expression in response to
flagellin. The response depended on both extracellular leucine-rich
repeats and intracellular Toll/IL-1R homology region of TLR5 as well as
the adaptor protein MyD88. Furthermore, immunolocalization and cell
surface-selective biotinylation revealed that TLR5 is expressed
exclusively on the basolateral surface of intestinal epithelia, thus
providing a molecular basis for the polarity of this innate immune
response. Thus, detection of flagellin by basolateral TLR5 mediates
epithelial-driven inflammatory responses to
Salmonella.
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J. Tseng, J. Do, J. H. Widdicombe, and T. E. Machen Innate immune responses of human tracheal epithelium to Pseudomonas aeruginosa flagellin, TNF-{alpha}, and IL-1beta Am J Physiol Cell Physiol, March 1, 2006; 290(3): C678 - C690. [Abstract] [Full Text] [PDF] |
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C Mueller and A J Macpherson Layers of mutualism with commensal bacteria protect us from intestinal inflammation Gut, February 1, 2006; 55(2): 276 - 284. [Full Text] [PDF] |
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M. Raffatellu, D. Chessa, R. P. Wilson, C. Tukel, M. Akcelik, and A. J. Baumler Capsule-Mediated Immune Evasion: a New Hypothesis Explaining Aspects of Typhoid Fever Pathogenesis Infect. Immun., January 1, 2006; 74(1): 19 - 27. [Full Text] [PDF] |
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C. F. Ortega-Cava, S. Ishihara, M. A. K. Rumi, M. M. Aziz, H. Kazumori, T. Yuki, Y. Mishima, I. Moriyama, C. Kadota, N. Oshima, et al. Epithelial Toll-Like Receptor 5 Is Constitutively Localized in the Mouse Cecum and Exhibits Distinctive Down-Regulation during Experimental Colitis Clin. Vaccine Immunol., January 1, 2006; 13(1): 132 - 138. [Abstract] [Full Text] [PDF] |
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H. Zeng, H. Wu, V. Sloane, R. Jones, Y. Yu, P. Lin, A. T. Gewirtz, and A. S. Neish Flagellin/TLR5 responses in epithelia reveal intertwined activation of inflammatory and apoptotic pathways Am J Physiol Gastrointest Liver Physiol, January 1, 2006; 290(1): G96 - G108. [Abstract] [Full Text] [PDF] |
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A. Verma, S. K. Arora, S. K. Kuravi, and R. Ramphal Roles of Specific Amino Acids in the N Terminus of Pseudomonas aeruginosa Flagellin and of Flagellin Glycosylation in the Innate Immune Response Infect. Immun., December 1, 2005; 73(12): 8237 - 8246. [Abstract] [Full Text] [PDF] |
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X.-M. Chen, S. P. O'Hara, J. B. Nelson, P. L. Splinter, A. J. Small, P. S. Tietz, A. H. Limper, and N. F. LaRusso Multiple TLRs Are Expressed in Human Cholangiocytes and Mediate Host Epithelial Defense Responses to Cryptosporidium parvum via Activation of NF-{kappa}B J. Immunol., December 1, 2005; 175(11): 7447 - 7456. [Abstract] [Full Text] [PDF] |
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Z. Zhang, J.-P. Louboutin, D. J. Weiner, J. B. Goldberg, and J. M. Wilson Human Airway Epithelial Cells Sense Pseudomonas aeruginosa Infection via Recognition of Flagellin by Toll-Like Receptor 5 Infect. Immun., November 1, 2005; 73(11): 7151 - 7160. [Abstract] [Full Text] [PDF] |
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A. S. Ismail and L. V. Hooper Epithelial Cells and Their Neighbors. IV. Bacterial contributions to intestinal epithelial barrier integrity Am J Physiol Gastrointest Liver Physiol, November 1, 2005; 289(5): G779 - G784. [Abstract] [Full Text] [PDF] |
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R. W. DePaolo, R. Lathan, B. J. Rollins, and W. J. Karpus The Chemokine CCL2 Is Required for Control of Murine Gastric Salmonella enterica Infection Infect. Immun., October 1, 2005; 73(10): 6514 - 6522. [Abstract] [Full Text] [PDF] |
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O. Pino, M. Martin, and S. M. Michalek Cellular Mechanisms of the Adjuvant Activity of the Flagellin Component FljB of Salmonella enterica Serovar Typhimurium To Potentiate Mucosal and Systemic Responses Infect. Immun., October 1, 2005; 73(10): 6763 - 6770. [Abstract] [Full Text] [PDF] |
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H. Tsujimoto, T. Uchida, P. A. Efron, P. O. Scumpia, A. Verma, T. Matsumoto, S. K. Tschoeke, R. F. Ungaro, S. Ono, S. Seki, et al. Flagellin enhances NK cell proliferation and activation directly and through dendritic cell-NK cell interactions J. Leukoc. Biol., October 1, 2005; 78(4): 888 - 897. [Abstract] [Full Text] [PDF] |
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S. H. Rhee, E. Im, M. Riegler, E. Kokkotou, M. O'Brien, and C. Pothoulakis Pathophysiological role of Toll-like receptor 5 engagement by bacterial flagellin in colonic inflammation PNAS, September 20, 2005; 102(38): 13610 - 13615. [Abstract] [Full Text] [PDF] |
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S. E. Applequist, E. Rollman, M. D. Wareing, M. Liden, B. Rozell, J. Hinkula, and H.-G. Ljunggren Activation of Innate Immunity, Inflammation, and Potentiation of DNA Vaccination through Mammalian Expression of the TLR5 Agonist Flagellin J. Immunol., September 15, 2005; 175(6): 3882 - 3891. [Abstract] [Full Text] [PDF] |
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G. Caron, D. Duluc, I. Fremaux, P. Jeannin, C. David, H. Gascan, and Y. Delneste Direct Stimulation of Human T Cells via TLR5 and TLR7/8: Flagellin and R-848 Up-Regulate Proliferation and IFN-{gamma} Production by Memory CD4+ T Cells J. Immunol., August 1, 2005; 175(3): 1551 - 1557. [Abstract] [Full Text] [PDF] |
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E Cario BACTERIAL INTERACTIONS WITH CELLS OF THE INTESTINAL MUCOSA: TOLL-LIKE RECEPTORS AND NOD2 Gut, August 1, 2005; 54(8): 1182 - 1193. [Full Text] [PDF] |
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S. K. Arora, A. N. Neely, B. Blair, S. Lory, and R. Ramphal Role of Motility and Flagellin Glycosylation in the Pathogenesis of Pseudomonas aeruginosa Burn Wound Infections Infect. Immun., July 1, 2005; 73(7): 4395 - 4398. [Abstract] [Full Text] [PDF] |
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E. Andersen-Nissen, K. D. Smith, K. L. Strobe, S. L. R. Barrett, B. T. Cookson, S. M. Logan, and A. Aderem Evasion of Toll-like receptor 5 by flagellated bacteria PNAS, June 28, 2005; 102(26): 9247 - 9252. [Abstract] [Full Text] [PDF] |
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L. A. Cummings, S. L. R. Barrett, W. D. Wilkerson, I. Fellnerova, and B. T. Cookson FliC-Specific CD4+ T Cell Responses Are Restricted by Bacterial Regulation of Antigen Expression J. Immunol., June 15, 2005; 174(12): 7929 - 7938. [Abstract] [Full Text] [PDF] |
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B. J. Johnson, S. S. Dritz, K. A. Skjolaas-Wilson, T. E. Burkey, and J. E. Minton Interactive responses in gut immunity, and systemic and local changes in the insulin-like growth factor system in nursery pigs in response to Salmonella enterica serovar Typhimurium J Anim Sci, June 1, 2005; 83(13_suppl): E48 - 56. [Abstract] [Full Text] [PDF] |
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M. Vijay-Kumar, J. R. Gentsch, W. J. Kaiser, N. Borregaard, M. K. Offermann, A. S. Neish, and A. T. Gewirtz Protein Kinase R Mediates Intestinal Epithelial Gene Remodeling in Response to Double-Stranded RNA and Live Rotavirus J. Immunol., May 15, 2005; 174(10): 6322 - 6331. [Abstract] [Full Text] [PDF] |
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K. L. Mumy and B. A. McCormick Events at the Host-Microbial Interface of the Gastrointestinal Tract II. Role of the intestinal epithelium in pathogen-induced inflammation Am J Physiol Gastrointest Liver Physiol, May 1, 2005; 288(5): G854 - G859. [Abstract] [Full Text] [PDF] |
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M. T. Abreu, M. Fukata, and M. Arditi TLR Signaling in the Gut in Health and Disease J. Immunol., April 15, 2005; 174(8): 4453 - 4460. [Abstract] [Full Text] [PDF] |
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M. Iqbal, V. J. Philbin, G. S. K. Withanage, P. Wigley, R. K. Beal, M. J. Goodchild, P. Barrow, I. McConnell, D. J. Maskell, J. Young, et al. Identification and Functional Characterization of Chicken Toll-Like Receptor 5 Reveals a Fundamental Role in the Biology of Infection with Salmonella enterica Serovar Typhimurium Infect. Immun., April 1, 2005; 73(4): 2344 - 2350. [Abstract] [Full Text] [PDF] |
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M. W. Hornef and C. Bogdan The role of epithelial Toll-like receptor expression in host defense and microbial tolerance Innate Immunity, April 1, 2005; 11(2): 124 - 128. [Abstract] [PDF] |
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