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Infection and Immunity, December 2006, p. 6581-6589, Vol. 74, No. 12
0019-9567/06/$08.00+0     doi:10.1128/IAI.00958-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Disruption of Tight Junctions and Induction of Proinflammatory Cytokine Responses in Colonic Epithelial Cells by Campylobacter jejuni{triangledown}

Ming L. Chen,1* Zhongming Ge,1 James G. Fox,1,2 and David B. Schauer1,2

Division of Comparative Medicine,1 Biological Engineering Division, Massachusetts Institute of Technology, Cambridge, Massachusetts 021392

Received 15 June 2006/ Returned for modification 24 July 2006/ Accepted 24 September 2006

Campylobacter jejuni is a leading cause of human enterocolitis and is associated with postinfectious complications, including irritable bowel syndrome and Guillain-Barré syndrome. However, the pathogenesis of C. jejuni infection remains poorly understood. Paracellular pathways in intestinal epithelial cells are gated by intercellular junctions (tight junctions and adherens junctions), providing a functional barrier between luminal microbes and host immune cells in the lamina propria. Here we describe alterations in tight junctions in intestinal epithelial monolayers following C. jejuni infection. Apical infection of polarized T84 monolayers caused a time-dependent decrease in transepithelial electrical resistance (TER). Immunofluorescence microscopy revealed a redistribution of the tight junctional transmembrane protein occludin from an intercellular to an intracellular location. Subcellular fractionation using equilibrium sucrose density gradients demonstrated decreased hyperphosphorylated occludin in lipid rafts, Triton X-100-soluble fractions, and the Triton X-100-insoluble pellet following apical infection. Apical infection with C. jejuni also caused rapid activation of NF-{kappa}B and AP-1, phosphorylation of extracellular signal-regulated kinase, Jun N-terminal protein kinase, and p38 mitogen-activated protein kinases, and basolateral secretion of the CXC chemokine interleukin-8 (IL-8). Basolateral infection with C. jejuni caused a more rapid decrease in TER, comparable redistribution of tight-junction proteins, and secretion of more IL-8 than that seen with apical infection. These results suggest that compromised barrier function and increased chemokine expression contribute to the pathogenesis of C. jejuni-induced enterocolitis.

* Corresponding author. Mailing address: Division of Comparative Medicine, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Bldg. 56-787, Cambridge, MA 02139. Phone: (617) 253-7212. Fax: (617) 258-0225. E-mail: mchen2{at}mit.edu.

{triangledown} Published ahead of print on 2 October 2006.

Editor: J. B. Bliska

Infection and Immunity, December 2006, p. 6581-6589, Vol. 74, No. 12
0019-9567/06/$08.00+0     doi:10.1128/IAI.00958-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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