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  • Papareddy, Praveen, et al. (författare)
  • A human antithrombin isoform dampens inflammatory responses and protects from organ damage during bacterial infection
  • 2019
  • Ingår i: Nature Microbiology. - : Springer Science and Business Media LLC. - 2058-5276. ; 4:12, s. 2442-2455
  • Tidskriftsartikel (refereegranskat)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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