The Open Biochemistry Journal

ISSN: 1874-091X ― Volume 13, 2019

Biophysical Mechanisms of the Neutralization of Endotoxins by Lipopolyamines

Diptesh Sil1, Lena Heinbockel2, Yani Kaconis2, Manfred Rössle3, Patrick Garidel4, Thomas Gutsmann2, Sunil A David1, Klaus Brandenburg2, *
1 Department. of Medicinal Chemistry, University of Kansas, Lawrence, KS, USA
2 Forschungszentrum Borstel, Leibniz-Zentrum für Medizin und Biowissenschaften, Borstel, Germany
3 European Molecular Biology Laboratory, Hamburg, Germany
4 Martin-Luther-Universität Halle-Wittenberg, Halle, Germany


Endotoxins (lipopolysaccharides, LPS) are one of the strongest immunostimulators in nature, responsible for beneficial effects at low, and pathophysiological effects at high concentrations, the latter frequently leading to sepsis and septic shock associated with high mortality in critical care settings. There are no drugs specifically targeting the pathophysiology of sepsis, and new therapeutic agents are therefore urgently needed. The lipopolyamines are a novel class of small molecules designed to sequester and neutralize LPS. To understand the mechanisms underlying the binding and neutralization of LPS toxicity, we have performed detailed biophysical analyses of the interactions of LPS with candidate lipopolyamines which differ in their potencies of LPS neutralization. We examined gel-to-liquid crystalline phase behavior of LPS and of its supramolecular aggregate structures in the absence and presence of lipopolyamines, the ability of such compounds to incorporate into different membrane systems, and the thermodynamics of the LPS:lipopolyamine binding. We have found that the mechanisms which govern the inactivation process of LPS obey similar rules as found for other active endotoxin neutralizers such as certain antimicrobial peptides.

Keywords: : Endotoxins, Lipopolysaccharide, Lipopolyamines, Sepsis, Inflammation.

Article Information

Identifiers and Pagination:

Year: 2013
Volume: 7
First Page: 82
Last Page: 93
Publisher Id: TOBIOCJ-7-82
DOI: 10.2174/1874091X01307010082

Article History:

Received Date: 17/7/2013
Revision Received Date: 30/7/2013
Acceptance Date: 8/8/2013
Electronic publication date: 30/9/2013
Collection year: 2013

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* Address correspondence to this author at the Forschungszentrum Borstel, Leibniz-Zentrum für Medizin und Biowissenschaften, Borstel, Germany; Tel: +49(0)4537-1882350; Fax: +49(04537-1886320; E-mail:


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