title: Extracellular DNA traps promote thrombosis.
abstract: Neutrophil extracellular traps (NETs) are part of the innate immune response to infections. NETs are a meshwork of DNA fibers comprising histones and antimicrobial proteins. Microbes are immobilized in NETs and encounter a locally high and lethal concentration of effector proteins. Recent studies show that NETs are formed inside the vasculature in infections and noninfectious diseases. Here we report that NETs provide a heretofore unrecognized scaffold and stimulus for thrombus formation. NETs perfused with blood caused platelet adhesion, activation, and aggregation. DNase or the anticoagulant heparin dismantled the NET scaffold and prevented thrombus formation. Stimulation of platelets with purified histones was sufficient for aggregation. NETs recruited red blood cells, promoted fibrin deposition, and induced a red thrombus, such as that found in veins. Markers of extracellular DNA traps were detected in a thrombus and plasma of baboons subjected to deep vein thrombosis, an example of inflammation-enhanced thrombosis. Our observations indicate that NETs are a previously unrecognized link between inflammation and thrombosis and may further explain the epidemiological association of infection with thrombosis.
authors.affiliation: Immune Disease Institute, Boston, MA 02115, USA.
authors.forename: Tobias A
authors.initials: TA
authors.lastname: Fuchs
authors.forename: Alexander
authors.initials: A
authors.lastname: Brill
authors.forename: Daniel
authors.initials: D
authors.lastname: Duerschmied
authors.forename: Daphne
authors.initials: D
authors.lastname: Schatzberg
authors.forename: Marc
authors.initials: M
authors.lastname: Monestier
authors.forename: Daniel D
authors.initials: DD
authors.lastname: Myers
authors.forename: Shirley K
authors.initials: SK
authors.lastname: Wrobleski
authors.forename: Thomas W
authors.initials: TW
authors.lastname: Wakefield
authors.forename: John H
authors.initials: JH
authors.lastname: Hartwig
authors.forename: Denisa D
authors.initials: DD
authors.lastname: Wagner
mesh_terms: D000818:Animals; D004247:DNA / Q000302:isolation & purification*; D006801:Humans; D013927:Thrombosis / Q000209:etiology*
chemical_list: D004247:DNA
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