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Endotoxemia in Healthy Subjects as a Human Model of Inflammation

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Part of the book series: Update in Intensive Care Medicine ((UICMSOFT,volume 31))

Abstract

Endotoxin is a lipopolysaccharide (LPS) that is a major component of the outer membrane of Gram-negative bacteria. Endotoxin has strong pro-inflammatory properties and can activate multiple inflammatory cascades. It is therefore considered to play a key role in the toxic sequelae of Gram-negative sepsis [1, 2]. LPS is composed of a lipid moiety, designated lipid A, and a hydrophilic polysaccharide chain. The polysaccharide portion of LPS consists of the O-chain, that protrudes from the bacterial membrane, and a ‘core part’, connecting the O-chain with lipid A. While the O-chain consists of a series of structurally and antigenically diverse oligosaccharides that determine the many different O-specific serotypes, the core part is identical for many different bacteria. Lipid A is the highly conserved biologically active part of LPS which is completely embedded in the bacterial membrane, shielded by the O-chain. Pro-inflammatory effects of Gramnegative bacteria can, therefore, not be readily explained by the effects of cellbound LPS. However, LPS can be shed by Gram-negative bacteria via several mechanisms, including destruction of the bacterial cell wall by complement factors.

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van der Poll, T., van Deventer, S.J.H. (2002). Endotoxemia in Healthy Subjects as a Human Model of Inflammation. In: Marshall, J.C., Cohen, J. (eds) Immune Response in the Critically Ill. Update in Intensive Care Medicine, vol 31. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-57210-4_22

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