Related Experiment Videos
Response of man to endotoxin
G D Martich1, A J Boujoukos, A F Suffredini
1Critical Care Medicine Department, Warren G. Magnuson Clinical Center, National Institutes of Health, Bethesda, MD.
Immunobiology
|April 1, 1993
Summary
Administering low-dose endotoxin to humans mimics early septic shock, revealing acute inflammatory responses and mediator release. This model helps understand host reactions critical to organ dysfunction in severe infections.
Area of Science:
- Microbiology
- Immunology
- Pathophysiology
Background:
- Endotoxin, a Gram-negative bacterial cell wall component, is key in septic shock pathogenesis.
- Acute inflammatory responses in humans resemble early septic shock stages.
Purpose of the Study:
- To investigate acute inflammatory responses and mediator release in humans following endotoxin administration.
- To utilize a human model for studying early responses to bacterial components and their role in septic shock.
Main Methods:
- Administration of small doses of intravenous endotoxin to human volunteers.
- Monitoring systemic hemodynamics, ventricular function, pulmonary gas exchange, and permeability.
- Measuring inflammatory mediator release, including cytokines, and leukocyte activation.
Main Results:
- Induced acute inflammatory responses similar to early septic shock.
- Observed changes in hemodynamics, cardiac function, and gas exchange within hours.
- Documented release of proinflammatory cytokines, activation of fibrinolytic and kallikrein-kinin systems, and phospholipase A2 release.
- Primed phagocytic leukocytes and initiated counter-regulatory responses.
Conclusions:
- Human endotoxemia model effectively mimics early septic shock.
- Identified key inflammatory mediators and cellular responses contributing to organ dysfunction.
- Provides insights into host responses critical for understanding severe infections and shock.