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Infect. Immun., Jun 1995, 2302-2309, Vol 63, No. 6
BA McCormick, SI Miller, D Carnes and JL Madara
Salmonella serotypes which elicit human enteritis cannot be distinguished
from those that do not on the basis of their in vitro interactions with
eukaryotic cells. We have recently reported that an enteritis-producing
strain of Salmonella typhimurium signals intact intestinal epithelium to
recruit subepithelial neutrophils to migrate across the epithelial (B. A.
McCormick, S. P. Colgan, C. D. Archer, S. I. Miller, and J. L. Madara, J.
Cell Biol. 123:895-907, 1993). We now utilize a cell culture model of human
intestinal epithelium (with T84 cells) to examine whether such
transepithelial signaling to neutrophils by salmonellae is predictive of
potential to elicit gastroenteritis. Various Salmonella serotypes,
including S. typhimurium, S. enteritidis, S. pullorum, S. arizonae, S.
typhi, and S. paratyphi, as well as invasion-defective mutants of S.
typhimurium, were studied. Strains or serotypes which elicit diffuse
enteritis in humans (defined histologically as transepithelial migration of
neutrophils) exhibited transepithelial signaling to neutorphils across
epithelial cell monolayers, while those which do not elicit diffuse
enteritis in humans did not display transepithelial signaling. In contrast,
the ability to enter the apical surface of T84 cells did not differentiate
strains or serotypes which induce diffuse enteritis from those which do
not. These results strongly suggest that the ability of salmonellae to
elicit transepithelial signaling to neutrophils is a key virulence
mechanism underlying Salmonella-elicited enteritis.
Copyright © 1995, American Society for Microbiology
Transepithelial signaling to neutrophils by salmonellae: a novel virulence mechanism for gastroenteritis
Department of Pathology, Brigham and Women's Hospital, Boston, Massachusetts 02115, USA.
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