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Monocyte activation after burns and endotoxemia
The Journal of Surgical Research
|April 1, 1989
Summary
Monocyte (M) activation, indicated by increased C3b and iC3b receptors, occurs after endotoxin exposure and in burn patients. This suggests a potential clinical marker for inflammatory responses and organ dysfunction following surgery or sepsis.
Area of Science:
- Immunology
- Cell Biology
Background:
- Monocytes (M) play a crucial role in immune responses.
- Monokine release from activated monocytes can contribute to organ dysfunction after surgery and sepsis.
Purpose of the Study:
- To investigate monocyte (M) activation by measuring cell surface receptors for C3b and iC3b.
- To assess if M activation correlates with clinical conditions like endotoxemia and burn injuries.
Main Methods:
- Monocyte (M) activation was assessed using indirect immunofluorescence to quantify cell surface receptors for C3b and iC3b.
- Experiments involved exposing monocytes to varying concentrations of lipopolysaccharide (LPS) in vitro.
- Human volunteers received LPS or saline, and burn patients were serially sampled.
Main Results:
- In vitro LPS exposure increased M C3b and iC3b receptor expression.
- In vivo LPS administration to volunteers caused transient increases in M C3b and iC3b receptors.
- Burn patients exhibited elevated M C3b and iC3b receptors for extended periods post-injury.
Conclusions:
- Monocyte (M) activation, marked by increased C3b and iC3b receptors, is induced by endotoxin.
- Elevated M C3b and iC3b receptors in burn patients suggest a prolonged inflammatory state.
- This M activation marker may have clinical utility in monitoring inflammatory conditions and organ dysfunction.