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A human antithrombin isoform dampens inflammatory responses and protects from organ damage during bacterial infection

Journal article
Authors P. Papareddy
M. Rossnagel
F. D. Hollwedel
G. Kilic
S. Veerla
C. Naudin
E. Smeds
J. Westman
I. Martinez-Martinez
A. Egesten
M. E. de la Morena-Barrio
J. Corral
A. Linder
A. Artoni
M. Abbattista
C. Novembrino
C. H. Brakebusch
I. Martinelli
Gopinath Kasetty
H. Herwald
Published in Nature Microbiology
Volume 4
Issue 12
Pages 2442-2455
ISSN 2058-5276
Publication year 2019
Published at Institute of Biomedicine, Department of Microbiology and Immunology
Pages 2442-2455
Language en
Links dx.doi.org/10.1038/s41564-019-0559-...
Keywords factor pathway inhibitor, sepsis, anticoagulant, phosphatase, activation, binding, myd88, Microbiology
Subject categories Microbiology

Abstract

Severe infectious diseases are often characterized by an overwhelming and unbalanced systemic immune response to microbial infections. Human antithrombin (hAT) is a crucial coagulation inhibitor with anti-inflammatory activities. Here we identify three hAT-binding proteins (CD13, CD300f and LRP-1) on human monocytes that are involved in blocking the activity of nuclear factor-kappa B. We found that the modulating effect is primarily restricted to the less abundant beta-isoform (h beta AT) of hAT that lacks N-glycosylation at position 135. Individuals with a mutation at this position have increased production of h beta AT and analysis of their blood, which was stimulated ex vivo with lipopolysaccharide, showed a decreased inflammatory response. Similar findings were recorded when heterozygotic mice expressing hAT or h beta AT were challenged with lipopolysaccharide or infected with Escherichia coli bacteria. Our results finally demonstrate that in a lethal E. coli infection model, survival rates increased when mice were treated with h beta AT one hour and five hours after infection. The treatment also resulted in a reduction of the inflammatory response and less severe organ damage.

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