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Infection and Immunity, November 1999, p. 5985-5993, Vol. 67, No. 11
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Shiga Toxins Stimulate Secretion of Interleukin-8
from Intestinal Epithelial Cells
C. M.
Thorpe,
Bryan P.
Hurley,
Lisa L.
Lincicome,
Mary
S.
Jacewicz,
Gerald T.
Keusch, and
David W. K.
Acheson*
Division of Geographic Medicine and
Infectious Diseases, New England Medical Center, Boston,
Massachusetts 02111
Received 22 March 1999/Returned for modification 28 May
1999/Accepted 27 August 1999
In the 1980s, Shiga toxin (Stx)-producing Escherichia
coli O157:H7 (STEC) was identified as a cause of hemorrhagic
colitis in the United States and was found to be associated with
hemolytic uremic syndrome (HUS), a microangiopathic hemolytic anemia
characterized by thrombocytopenia and renal failure. The precise way
that Stxs cause hemorrhagic colitis and HUS is unclear. Stxs have been
thought to cause disease by killing or irreversibly harming sensitive cells through a nonspecific blockade of mRNA translation, eventually resulting in cytotoxicity by preventing synthesis of critical molecules
needed to maintain cell integrity. Because STEC is noninvasive, we have
been exploring the host-toxin response at the level of the
gastrointestinal mucosa, where STEC infection begins. We have found
that Stx is capable of interleukin-8 (IL-8) superinduction in a human
colonic epithelial cell line. Despite a general blockade of mRNA
translation, Stx treatment results in increased IL-8 mRNA as well as
increased synthesis and secretion of IL-8 protein. Our data suggest
that an active Stx A subunit is required for this activity. Ricin,
which has the same enzymatic activity and trafficking pathway as Stx,
has similar effects. Exploration of the effects of other protein
synthesis inhibitors (cycloheximide, anisomycin) suggests a mechanism
of gene regulation that is distinct from a general translational
blockade. Use of the specific p38/RK inhibitor SB202190 showed that
blocking of this pathway results in decreased Stx-mediated IL-8
secretion. Furthermore, Stxs induced mRNA of the primary response gene
c-jun, which was subsequently partially blocked by
SB202190. These data suggest a novel model of how Stxs contribute to
disease, namely that Stxs may alter regulation of host cell processes
in sensitive cells via activation of at least one member of the
mitogen-activated protein kinase family in the p38/RK cascade and
induction of c-jun mRNA. Stx-induced increases in chemokine
synthesis from intestinal epithelial cells could be important in
augmenting the host mucosal inflammatory response to STEC infection.
*
Corresponding author. Mailing address: Division of
Geographic Medicine and Infectious Diseases, New England Medical
Center, Box 041, 750 Washington St., Boston, MA 02111. Phone: (617)
636-7002. Fax: (617) 636-5292. E-mail:
david.acheson{at}es.nemc.org.
Infection and Immunity, November 1999, p. 5985-5993, Vol. 67, No. 11
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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