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Detection of circulating tumor necrosis factor after endotoxin administration
H R Michie1, K R Manogue, D R Spriggs
1Laboratory for Surgical Metabolism and Nutrition, Brigham and Women's Hospital, Boston, MA 02115.
The New England Journal of Medicine
|June 9, 1988
Summary
Bacterial endotoxin triggers a rapid release of tumor necrosis factor alpha (TNF-α), a key cytokine mediating host responses. Ibuprofen reduces endotoxin-induced symptoms by impacting the cyclooxygenase pathway.
Area of Science:
- Immunology
- Pathophysiology
Background:
- Cytokines are crucial for host defense against bacterial infections.
- Consistent detection of elevated cytokines in infected patients remains a challenge.
Purpose of the Study:
- To investigate the role of specific cytokines in host responses to bacterial endotoxin.
- To examine the temporal relationship between cytokine levels and physiological responses.
Main Methods:
- Healthy men received intravenous Escherichia coli endotoxin or saline.
- Plasma cytokine levels (TNF-α, IL-1β, IFN-γ) and physiological responses were measured.
- The effect of ibuprofen pretreatment on endotoxin response was assessed.
Main Results:
- Endotoxin administration led to a significant, transient increase in circulating tumor necrosis factor alpha (TNF-α) levels.
- Host symptoms and physiological changes were temporally linked to TNF-α concentrations.
- Ibuprofen attenuated symptoms and responses without blocking the TNF-α surge.
- Interleukin-1 beta and gamma interferon levels did not change significantly.
Conclusions:
- Host response to endotoxin involves a brief pulse of circulating TNF-α.
- The cyclooxygenase pathway mediates the physiological effects of TNF-α in response to endotoxin.