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Degradation, Induction of Nitric Oxide Synthase, Induction of Proinflammatory Mediators, and Cardiovascular Dysfunction1

,¶
,
*
Inotek Corporation, Beverly, MA 01915;
Critical Care Medicine,
Pulmonary Biology, and
Pulmonary Medicine, Allergy, and Clinical Immunology Division, Childrens Hospital Medical Center, Cincinnati, OH 45229; and
¶ Department of Surgery, New Jersey Medical School, University of Medicine and Dentistry of New Jersey, Newark, NJ 01703
Gram-negative sepsis is mediated by the actions of proinflammatory
genes induced in response to microbes and their products. We report
that flagellin, the monomeric subunit of flagella, is a potent
proinflammatory species released by Salmonella.
Flagellin (1 µg/ml) induces I
B
degradation, NF-
B nuclear
translocation, and inducible NO synthase expression in cultured
intestinal epithelial cells (IEC). Aflagellic Salmonella
mutants do not induce NF-
B activation or NO production by cultured
IEC. Antiserum to flagellin blocks NO production in IEC induced by
medium conditioned by a variety of motile Gram-negative enteric
pathogens (Escherichia coli, Salmonella
muenchen, Serratia marcescens, Proteus
mirabilis, and Proteus vulgaris). Flagellin,
when injected systemically (
10 µg/mouse), induces systemic
inflammation characterized by the systemic expression of a range of
proinflammatory cytokines and chemokines and of inducible NO synthase.
At higher doses (
300 µg/mouse), flagellin induces shock,
characterized by hypotension, reduced vascular contractility in mice,
and death. The effects of flagellin do not diminish in C3H/HeJ
LPS-resistant mice, indicating that the Toll-like receptor-4 receptor
is not involved in flagellins actions. In LPS-resistant mice, i.p.
injection of S. dublin flagellin or medium conditioned
by wild-type S. dublin induces serum IFN-
and
TNF-
, whereas medium conditioned by aflagellic mutants has no
effect. Flagellin can be detected in the blood of rats with septic
shock induced by live bacteria at approximately 1 µg/ml. We
propose that flagellin released by Gram-negative pathogens may
contribute to the inflammatory response by an LPS- and Toll-like
receptor-4-independent pathway.
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