Contact system activation in severe infectious diseases

Area of Science:

• Coagulation and Fibrinolysis
• Infectious Diseases
• Immunology

Background:

• Hemostasis is a tightly regulated process involving vascular endothelium, blood cells, and coagulation/fibrinolytic cascades.
• Severe infections can disrupt the balance between procoagulant and anticoagulant states, leading to life-threatening complications.
• The contact system (intrinsic coagulation pathway/kallikrein/kinin system) is implicated in these infectious disease processes.

Purpose of the Study:

• To review the current understanding of the contact system's role in severe infectious diseases.
• To explore the potential of the contact system as a therapeutic target for novel antimicrobial strategies.

Main Methods:

• Literature review summarizing research on contact system activation in infectious diseases.
• Analysis of studies involving animal models and human patients with sepsis and septic shock.

Main Results:

• Systemic activation of the contact system is observed in animal models of bacterial infections and in patients with sepsis.
• Contact activation releases bradykinin, initiating coagulation and inflammation.
• Complications include bradykinin overproduction, factor consumption, inflammation, hypotension, and vascular leakage.

Conclusions:

• The contact system plays a significant role in the pathophysiology of severe infectious diseases.
• Modulating the contact system presents a potential avenue for developing new antimicrobial therapies.