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Proteolysis of Human Thrombin Generates Novel Host Defense Peptides
Vise andre og tillknytning
2010 (engelsk)Inngår i: PLoS pathogens, ISSN 1553-7366, Vol. 6, nr 4, s. e1000857-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The coagulation system is characterized by the sequential and highly localized activation of a series of serine proteases, culminating in the conversion of fibrinogen into fibrin, and formation of a fibrin clot. Here we show that C-terminal peptides of thrombin, a key enzyme in the coagulation cascade, constitute a novel class of host defense peptides, released upon proteolysis of thrombin in vitro, and detected in human wounds in vivo. Under physiological conditions, these peptides exert antimicrobial effects against Gram-positive and Gram-negative bacteria, mediated by membrane lysis, as well as immunomodulatory functions, by inhibiting macrophage responses to bacterial lipopolysaccharide. In mice, they are protective against P. aeruginosa sepsis, as well as lipopolysaccharide-induced shock. Moreover, the thrombin-derived peptides exhibit helical structures upon binding to lipopolysaccharide and can also permeabilize liposomes, features typical of "classical" helical antimicrobial peptides. These findings provide a novel link between the coagulation system and host-defense peptides, two fundamental biological systems activated in response to injury and microbial invasion.

sted, utgiver, år, opplag, sider
2010. Vol. 6, nr 4, s. e1000857-
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-136557DOI: 10.1371/journal.ppat.1000857ISI: 000277722400029PubMedID: 20421939OAI: oai:DiVA.org:uu-136557DiVA, id: diva2:377296
Tilgjengelig fra: 2010-12-14 Laget: 2010-12-13 Sist oppdatert: 2011-01-11bibliografisk kontrollert

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