Extraintestinal dissemination of Salmonella by CD18-expressing phagocytes.

Journal Article (Journal Article)

Specialized epithelia known as M cells overlying the lymphoid follicles of Peyer's patches are important in the mucosal immune system, but also provide a portal of entry for pathogens such as Salmonella typhimurium, Mycobacterium bovis, Shigella flexneri, Yersinia enterocolitica and reoviruses. Penetration of intestinal M cells and epithelial cells by Salmonella typhimurium requires the invasion genes of Salmonella Pathogenicity Island 1 (SPI1). SPI1-deficient S. typhimurium strains gain access to the spleen following oral administration and cause lethal infection in mice without invading M cells or localizing in Peyer's patches, which indicates that Salmonella uses an alternative strategy to disseminate from the gastrointestinal tract. Here we report that Salmonella is transported from the gastrointestinal tract to the bloodstream by CD18-expressing phagocytes, and that CD18-deficient mice are resistant to dissemination of Salmonella to the liver and spleen after oral administration. This CD18-dependent pathway of extraintestinal dissemination may be important for the development of systemic immunity to gastrointestinal pathogens, because oral challenge with SPI1-deficient S. typhimurium elicits a specific systemic IgG humoral immune response, despite an inability to stimulate production of specific mucosal IgA.

Full Text

Duke Authors

Cited Authors

  • Vazquez-Torres, A; Jones-Carson, J; Bäumler, AJ; Falkow, S; Valdivia, R; Brown, W; Le, M; Berggren, R; Parks, WT; Fang, FC

Published Date

  • October 21, 1999

Published In

Volume / Issue

  • 401 / 6755

Start / End Page

  • 804 - 808

PubMed ID

  • 10548107

International Standard Serial Number (ISSN)

  • 0028-0836

Digital Object Identifier (DOI)

  • 10.1038/44593


  • eng

Conference Location

  • England