Related Experiment Videos
Nitric oxide from polymorphonuclear leukocytes modulates red blood cell deformability in vitro
1Department of Pharmacology, Nicolaus Copernicus University School of Medicine, Cracow, Poland.
European Journal of Pharmacology
|March 30, 1993
Summary
Polymorphonuclear leukocytes (PMNs) impact red blood cell (RBC) deformability. Nitric oxide (NO) release by PMNs modulates this effect, with optimal RBC deformability occurring within a specific NO concentration range.
Area of Science:
- Hematology
- Cell Biology
- Physiology
Background:
- Red blood cell (RBC) deformability is crucial for microcirculation.
- Polymorphonuclear leukocytes (PMNs) can influence RBC properties.
- Nitric oxide (NO) is a signaling molecule with diverse physiological roles.
Purpose of the Study:
- To investigate the effect of PMNs on rabbit RBC deformability.
- To determine the role of nitric oxide (NO) in PMN-mediated modulation of RBC deformability.
Main Methods:
- Incubation of rabbit RBCs with varying concentrations of PMNs.
- Treatment with NO donors (sydnonimine, sodium nitroprusside) and an NO synthase inhibitor (NG-monomethyl-L-arginine).
- Measurement of RBC deformability using established techniques.
Main Results:
- PMNs at low concentrations (up to 1.2 x 10^6 cells/ml) decreased RBC deformability.
- PMNs at intermediate concentrations (up to 2.8 x 10^6 cells/ml) increased RBC deformability.
- High PMN concentrations and IL-8 stimulation reduced RBC deformability.
- NO donors enhanced RBC deformability in the presence of low PMN counts, while NO synthase inhibition reduced it.
Conclusions:
- PMNs modulate RBC deformability through the release of NO.
- RBC deformability is critically dependent on NO concentration.
- Optimal RBC deformability is maintained within a specific range of NO concentrations, with effects reversed at suboptimal or excessive levels.