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A role for ELAM-1 in the pathogenesis of MOF during septic shock
I Engelberts1, S K Samyo, J F Leeuwenberg
1Department of Surgery, University of Limburg, Maastricht, The Netherlands.
Abstract:
As a model for septic shock, LPS was infused into anesthetized Cynomolgus monkeys. Hematologic and metabolic parameters proved the induced shock response. The data presented show that administration of LPS to Cynomolgus monkeys induced a generalized inflammatory status, which was characterized by systemic release of the cytokines TNF and IL-6. Further it was demonstrated, using immune-histological methods, that a generalized expression in vivo of the endothelial leukocyte adhesion molecule (ELAM)-1 was induced on endothelial cells by LPS infusion. ELAM-1 expression was most pronounced on vasculature of lung tissue and skin. As shown in serial skin biopsies, ELAM-1 expression was induced rapidly: at 2 hr after the onset of LPS infusion, reaching maximum after 4 hr. The expression of ELAM-1 is considered to be of relevance for the mechanism which underlies the stasis of PMN in the tissues during septic shock.
Insights
Lipopolysaccharide (LPS) infusion in Cynomolgus monkeys created a septic shock model, inducing inflammation and releasing cytokines. This study highlights the rapid induction of endothelial leukocyte adhesion molecule-1 (ELAM-1) expression, crucial for understanding septic shock mechanisms.
Area of Science:
- Immunology
- Pathophysiology
- Animal Models
Background:
- Sepsis is a life-threatening organ dysfunction caused by a dysregulated host response to infection.
- Lipopolysaccharide (LPS) is a key component of Gram-negative bacteria and a potent inducer of septic shock.
- Understanding the early molecular events in septic shock is critical for developing effective treatments.
Purpose of the Study:
- To establish a septic shock model in Cynomolgus monkeys using LPS infusion.
- To investigate the systemic inflammatory response, including cytokine release and endothelial cell activation.
- To characterize the temporal expression of endothelial leukocyte adhesion molecule-1 (ELAM-1) in response to LPS.
Main Methods:
- Administration of LPS to anesthetized Cynomolgus monkeys to induce a septic shock model.
- Monitoring of hematologic and metabolic parameters to confirm the shock state.
- Measurement of systemic cytokine levels (TNF and IL-6) via immunoassay.
- Immunohistological analysis of tissues (lung, skin) to assess ELAM-1 expression on endothelial cells.
- Serial skin biopsies to determine the time course of ELAM-1 induction.
Main Results:
- LPS infusion successfully induced a septic shock response in Cynomolgus monkeys.
- A generalized inflammatory status was confirmed by systemic release of tumor necrosis factor (TNF) and interleukin-6 (IL-6).
- LPS rapidly induced in vivo expression of ELAM-1 on endothelial cells, particularly in lung and skin vasculature, peaking at 4 hours.
Conclusions:
- LPS infusion in Cynomolgus monkeys serves as a valid model for studying septic shock.
- The rapid induction of ELAM-1 expression is a key early event in LPS-induced inflammation.
- ELAM-1 expression is implicated in the stasis of polymorphonuclear leukocytes (PMN) in tissues during septic shock.