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© Research
Publication : The Journal of biological chemistry

The Salmonella typhimurium flagellar basal body protein FliE is required for flagellin production and to induce a proinflammatory response in epithelial cells

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in The Journal of biological chemistry - 30 Jan 2002

Reed KA, Hobert ME, Kolenda CE, Sands KA, Rathman M, O'Connor M, Lyons S, Gewirtz AT, Sansonetti PJ, Madara JL

Link to Pubmed [PMID] – 11821427

J. Biol. Chem. 2002 Apr;277(15):13346-53

During apical colonization by Salmonella typhimurium, intestinal epithelial cells orchestrate a proinflammatory response that involves secretion of chemoattractants, predominantly interleukin-8, which coordinate neutrophil trans-epithelial migration at the site of infection. This host-pathogen interaction requires several S. typhimurium genes. To identify novel genes that participate in this pathogen-induced proinflammatory response, we created S. typhimurium Tn-10 transposon mutants and identified a single mutant with Tn-10 insertional inactivation within the fliE flagellar locus that was able to adhere to and invade intestinal epithelial cells normally but was unable to induce interleukin-8 secretion in host cells. The fliE-deficient mutant failed to secrete flagellin and lacked any surface assembly of flagellae. Unlike wild-type S. typhimurium, the fliE-deficient mutant did not activate the IkappaBalpha/NF-kappaB signaling pathway or induce the coordinated trans-epithelial migration of isolated human neutrophils. Transcomplementation of the fliE-deficient mutant with a wild-type fliE-harboring plasmid restored all defects and produced a wild-type S. typhimurium phenotype. Furthermore, functional down-regulation of basolateral TLR5 completely inhibited the monolayers’ ability to respond to both wild-type S. typhimurium and purified flagellin but had no affect on tumor necrosis factor alpha-induced responses. We therefore conclude that S. typhimurium fliE is essential for flagellin secretion, flagellar assembly, and S. typhimurium-induced proinflammatory responses through basolateral TLR5 and is consistent with the emerging model of S. typhimurium flagellin-induced inflammation.

http://www.ncbi.nlm.nih.gov/pubmed/11821427