Antithrombin modulates the leukocyte-endothelial cell interaction in the staphylococcal enterotoxin B-challenged...

Area of Science:

• Sepsis research
• Microcirculation studies
• Inflammatory mediator analysis

Background:

• Antithrombin is known for its beneficial effects in endotoxemia.
• This study investigates antithrombin's role in supertoxin-induced sepsis.

Purpose of the Study:

• To evaluate the protective effects of antithrombin in a mouse model of sepsis induced by staphylococcal enterotoxin B.
• To analyze the impact of antithrombin on microcirculation and humoral mediators during sepsis.

Main Methods:

• Mice were administered staphylococcal enterotoxin B and antithrombin concurrently.
• Mesenteric microcirculation was assessed using intravital microscopy 1 hour post-injection.
• Humoral mediators, including adhesion molecules and cytokines, were quantified.

Main Results:

• Antithrombin significantly reduced rolling leukocyte-endothelial cell interactions (p < 0.01).
• The decrease in white blood cell and platelet counts was significantly inhibited in antithrombin-treated mice (p < 0.01).
• Elevated levels of intercellular adhesion molecule-1 (p < 0.05), soluble tumor necrosis factor-alpha receptor (p < 0.05), and interleukin-6 (p < 0.01) were attenuated.

Conclusions:

• Antithrombin demonstrates protective effects on microcirculation in a staphylococcal enterotoxin B-induced sepsis model.
• The mechanism involves attenuating leukocyte-endothelial cell interactions.
• Suppression of adhesion molecule expression and cytokine production contributes to antithrombin's protective role.