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,
Departments of
*
Pharmacology,
Pediatrics, and
Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX 75235
Endotoxin triggers many of the inflammatory, hemodynamic, and
hematological derangements of Gram-negative septic shock. Recent
genetic studies in mice have identified the Toll-like receptor 4 as the
transmembrane endotoxin signal transducer. The IL-1 intracellular
signaling pathway has been implicated in Toll-like receptor signal
transduction. LPS-induced activation of the IL-1 receptor-associated
kinase (IRAK), and the influence of IRAK on intracellular signaling and
cellular responses to endotoxin has not been explored in relevant
innate immune cells. We demonstrate that LPS activates IRAK in murine
macrophages. IRAK-deficient macrophages, in contrast, are resistant to
LPS. Deletion of IRAK disrupts several endotoxin-triggered signaling
cascades. Furthermore, macrophages lacking IRAK exhibit impaired
LPS-stimulated TNF-
production, and IRAK-deficient mice withstand
the lethal effects of LPS. These findings, coupled with the critical
role for IRAK in IL-1 and IL-18 signal transduction, demonstrate the
importance of this kinase and the IL-1/Toll signaling cassette in
sensing and responding to Gram-negative
infection.
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