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The Journal of Immunology, 2003, 170: 14-18.
Copyright © 2003 by The American Association of Immunologists

Cutting Edge

Cutting Edge: Bacterial Lipoprotein Induces Endotoxin-Independent Tolerance to Septic Shock

Jiang Huai Wang1,2, Majella Doyle2, Brian J. Manning, Siobhan Blankson, Qiong Di Wu, Colm Power, Ronan Cahill and H. Paul Redmond

Department of Academic Surgery, National University of Ireland, Cork University Hospital, Cork, Ireland

Tolerance to bacterial cell wall components is an adaptive host response. Endotoxin/LPS tolerance is characterized by a survival advantage against subsequent lethal LPS challenge. However, it is uncertain whether LPS tolerance can afford protection against other septic challenges. In this study, we show that tolerance induced by bacterial lipoprotein (BLP) protects mice against not only BLP-induced lethality, but also LPS-, live bacteria-, and polymicrobial sepsis-induced lethality. In contrast, LPS tolerance offers no survival benefit against the latter two challenges. Furthermore, induction of BLP tolerance results in overexpression of complement receptor type 3 and Fc{gamma}III/IIR on neutrophils (polymorphonuclear neutrophils) and peritoneal macrophages, with increased bacterial recognition and bactericidal activity, whereas LPS-tolerized mice exhibit an impaired ability to ingest and to kill bacteria. These results indicate that BLP tolerance is a novel adaptive host response associated with a unique protective effect during septic shock.




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