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Kininogen supports inflammation and bacterial spreading during Streptococccus Pyogenes Sepsis.

Abstract：

BACKGROUND:High-molecular-weight kininogen is a cofactor of the human contact system, an inflammatory response mechanism that is activated during sepsis. It has been shown that high-molecular-weight kininogen contributes to endotoxemia, but is not critical for local host defense during pneumonia by Gram-negative bacteria. However, some important pathogens, such as Streptococcus pyogenes, can cleave kininogen by contact system activation. Whether kininogen causally affects antibacterial host defense in S. pyogenes infection, remains unknown. METHODS:Kininogen concentration was determined in course plasma samples from septic patients. mRNA expression and degradation of kininogen was determined in liver or plasma of septic mice. Kininogen was depleted in mice by treatment with selective kininogen directed antisense oligonucleotides (ASOs) or a scrambled control ASO for 3 weeks prior to infection. 24 h after infection, infection parameters were determined. FINDINGS:Data from human and mice samples indicate that kininogen is a positive acute phase protein. Lower kininogen concentration in plasma correlate with a higher APACHE II score in septic patients. We show that ASO-mediated depletion of kininogen in mice indeed restrains streptococcal spreading, reduces levels of proinflammatory cytokines such as IL-1β and IFNγ, but increased intravascular tissue factor and fibrin deposition in kidneys of septic animals. INTERPRETATION:Mechanistically, kininogen depletion results in reduced plasma kallikrein levels and, during sepsis, in increased intravascular tissue factor that may reinforce immunothrombosis, and thus reduce streptococcal spreading. These novel findings point to an anticoagulant and profibrinolytic role of kininogens during streptococcal sepsis. FUNDING:Full details are provided in the Acknowledgements section.

journal_name

EBioMedicine

journal_title

EBioMedicine

authors

Köhler J,Maletzki C,Koczan D,Frank M,Springer A,Steffen C,Revenko AS,MacLeod AR,Mikkat S,Kreikemeyer B,Oehmcke-Hecht S

doi

10.1016/j.ebiom.2020.102908

subject

Has Abstract

pub_date

2020-08-01 00:00:00

pages

102908

issn

2352-3964

pii

S2352-3964(20)30283-8

journal_volume

58

pub_type

杂志文章

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