Bacteroides and the Kallikrein-Kinin System
Author Information
Author(s): Elizabeth C. Murphy, Matthias Mörgelin, Jakki C. Cooney, Inga-Maria Frick
Primary Institution: Lund University
Hypothesis
Can Bacteroides fragilis and Bacteroides thetaiotaomicron activate the contact system in human plasma?
Conclusion
Bacteroides species can activate the contact system, leading to prolonged coagulation times and release of bradykinin.
Supporting Evidence
- Bacteroides fragilis and Bacteroides thetaiotaomicron bind high-molecular-mass kininogen and fibrinogen from human plasma.
- Activation of the contact system by Bacteroides leads to prolonged intrinsic coagulation time.
- Both species release bradykinin, a proinflammatory peptide, during contact activation.
Takeaway
Bacteroides bacteria can mess with our blood's ability to clot and cause inflammation, which helps them spread during infections.
Methodology
Bacteria were incubated with human plasma, and their interactions with contact factors and fibrinogen were analyzed using Western blotting and clotting assays.
Limitations
The study does not explore all potential virulence factors of Bacteroides.
Digital Object Identifier (DOI)
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