Interactions of the invasive pathogens Salmonella typhimurium, Listeria monocytogenes, and Shigella flexneri with M cells and murine Peyer's patches.
Invasive enteric bacteria must pass through the intestinal epithelium in order to establish infection. It is becoming clear that a common target for intestinal mucosa penetration is the specialized epithelial cell of Peyer's patches, the M cell. In order to gain a better understanding of how bacteria interact with M cells, we have compared the interactions of Salmonella typhimurium, Listeria monocytogenes, and Shigella flexneri with M cells by using a murine ligated-loop model. Our results indicate that S. typhimurium possesses a highly efficient mechanism for M cell entry that targets and destroys these cells, while L. monocytogenes and S. flexneri appear to be internalized into M cells in a less disruptive fashion. Early uptake of Listeria or Shigella into M cells appeared to lead to the death of some cells, as evidenced by the appearance of holes in the intestinal epithelium. At later time points, the follicle-associated epithelium of animals infected with these bacteria displayed extensive destruction. These data indicate that enteric pathogens use different strategies to interact with M cells and initiate infection of a host.
Department of Microbiology, University of Iowa School of Medicine, Iowa City, Iowa 52242-1109, USA.
V B
VB
Jensen
J T
JT
Harty
B D
BD
Jones
D000818:Animals; D001427:Bacterial Toxins; D004847:Epithelial Cells; D004848:Epithelium / Q000382:microbiology / Q000648:ultrastructure; D005260:Female; D006360:Heat-Shock Proteins / Q000378:metabolism; D006460:Hemolysin Proteins; D008089:Listeria monocytogenes / Q000378:metabolism / Q000502:physiology*; D051379:Mice; D008807:Mice, Inbred BALB C; D008855:Microscopy, Electron, Scanning; D010581:Peyer's Patches / Q000382:microbiology / Q000473:pathology / Q000648:ultrastructure; D012486:Salmonella typhimurium / Q000502:physiology*; D012763:Shigella flexneri / Q000502:physiology*
D001427:Bacterial Toxins; D006360:Heat-Shock Proteins; D006460:Hemolysin Proteins; C038705:hlyA protein, Listeria monocytogenes