Related Experiment Videos
Modulation of functions of granulocytes by recombinant human GM-CSF and possible complications of GM-CSF therapy
M Klausmann1, K H Pflüger, D Krumwieh
1Department of Medicine, University of Marburg, F.R.G.
Abstract:
Besides its effect on bone marrow progenitors, GM-CSF is able to modulate functions of mature cells such as neutrophils. It inhibits random migration and chemotaxis through action on both cells and chemotactic factors, and stimulates oxidative metabolism as well as elastase release. Furthermore, it strongly enhances the response of the cells to the usual stimulants such as f-Met-Leu-Phe and phorbol esters. The role of neutral proteinases and activated oxygen species in different diseases such as ARDS, emphysema, coagulation defects, arthritis, and inflammation, is recognized. The remarkable in vitro release of neutral proteinases and activated oxygen species from granulocytes after GM-CSF stimulation may be of importance in vivo. This should be considered in clinical application of GM-CSF, particularly with high-dose therapy.
Insights
Granulocyte-macrophage colony-stimulating factor (GM-CSF) enhances neutrophil functions, including oxidative metabolism and proteinase release. This may have implications for inflammatory diseases and high-dose therapies.
Area of Science:
- Immunology
- Cell Biology
- Hematology
Background:
- Granulocyte-macrophage colony-stimulating factor (GM-CSF) influences both progenitor and mature myeloid cells.
- Mature neutrophils possess functions that can be modulated by GM-CSF, impacting inflammatory processes.
Purpose of the Study:
- To investigate the effects of GM-CSF on mature neutrophil functions.
- To explore the potential in vivo significance of GM-CSF-induced neutrophil responses.
Main Methods:
- Assessing neutrophil migration (random and chemotaxis) in response to GM-CSF.
- Measuring oxidative metabolism and elastase release from neutrophils.
- Evaluating neutrophil responses to stimulants like f-Met-Leu-Phe and phorbol esters after GM-CSF exposure.
Main Results:
- GM-CSF inhibits neutrophil random migration and chemotaxis.
- GM-CSF stimulates neutrophil oxidative metabolism and elastase release.
- GM-CSF potentiates neutrophil responses to common stimulants.
Conclusions:
- GM-CSF significantly modulates mature neutrophil functions, enhancing their effector capabilities.
- The in vitro release of neutral proteinases and reactive oxygen species by GM-CSF-stimulated neutrophils may be relevant in inflammatory conditions.
- Clinical applications of GM-CSF, especially at high doses, warrant consideration of these enhanced neutrophil activities.