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Divisions of Infectious Diseases and Gastroenterology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205-2196
Studies of the impact of enteric pathogens and their virulence factors on the proteins comprising the tight junction and zonula adherens offer a novel approach to dissection of tight junctional complex regulation. Most studies to date provide only tantalizing clues that select pathogens may indeed assault the tight junctional complex. Information on critical human pathogens such as Campylobacter jejuni and Shigella and Salmonella subspecies is lacking. Mechanistic studies are currently sparse, but available results on pathogenic Escherichia coli and specific virulence factors such as the Rho-modifying and protease bacterial toxins indicate four major mechanisms by which these pathogens may act: 1) direct cleavage of tight junctional structural proteins; 2) modification of the actin cytoskeleton; 3) activation of cellular signal transduction; and 4) triggering transmigration of polymorphonuclear cells across the epithelial cell barrier. New therapeutics may evolve from detailed studies of these pathogens and the cellular processes and proteins they disrupt.
zonula adherens; zonula occludens; intestinal epithelial cell; bacterial toxins; cytoskeleton
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