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Activated human neutrophils rapidly break down nitric oxide
1Department of Biochemistry, University of Cambridge, UK. agmb@mole.bio.cam.ac.uk
FEBS Letters
|December 12, 1997
Summary
Human neutrophils do not produce nitric oxide (NO) but rapidly break it down upon activation. This NO scavenging by activated neutrophils may impact physiological processes like vasoconstriction and platelet aggregation.
Area of Science:
- Immunology
- Biochemistry
- Physiology
Background:
- Nitric oxide (NO) is a crucial signaling molecule involved in various physiological processes.
- Neutrophils are key immune cells that play a role in inflammation and host defense.
Purpose of the Study:
- To investigate the production and degradation of nitric oxide (NO) by human neutrophils.
- To determine the effect of neutrophil activation on NO levels and its implications.
Main Methods:
- Isolated human neutrophils were activated using phorbol 12-myristate 13-acetate (PMA) or a chemotactic peptide.
- Nitric oxide (NO) levels were measured before and after activation.
- The breakdown of exogenously added NO by activated neutrophils was quantified.
Main Results:
- Human neutrophils did not produce detectable levels of NO, even after activation.
- Activated neutrophils rapidly degraded exogenous NO, with superoxide (O2-) production being the primary mechanism.
- Superoxide dismutase significantly reduced the rate of NO breakdown.
Conclusions:
- Neutrophil activation in vivo likely leads to a significant reduction in local NO concentrations.
- This NO scavenging by neutrophils may contribute to vasoconstriction, platelet aggregation, and peroxynitrite formation.