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Proinflammatory mediators stimulate neutrophil-directed angiogenesis.
M McCourt1, J H Wang, S Sookhai
1Department of Surgery, Professorial Unit, Cork University Hospital, Ireland.
Archives of Surgery (Chicago, Ill. : 1960)
|December 11, 1999
Summary
Activated neutrophils release vascular endothelial growth factor (VEGF), promoting new blood vessel formation. This finding is crucial for understanding inflammation, wound healing, and tumor growth.
Area of Science:
- Immunology
- Angiogenesis Research
- Cell Biology
Background:
- Vascular endothelial growth factor (VEGF) is a key cytokine in angiogenesis.
- Neutrophils (PMNs) have been identified as a source of VEGF.
- Acute inflammation stimulates PMN-driven angiogenesis.
Purpose of the Study:
- To investigate the role of activated human neutrophils in angiogenesis.
- To determine if neutrophils release functional VEGF that affects endothelial cells.
Main Methods:
- Human neutrophils were stimulated with LPS, TNF-alpha, IL-6, and Fas antibody.
- VEGF levels in supernatants were measured by ELISA.
- Endothelial cell proliferation and tubule formation were assessed.
- Western blot analysis was used to detect VEGF expression.
Main Results:
- LPS and TNF-alpha significantly increased VEGF release from neutrophils.
- Stimulated neutrophil supernatants enhanced endothelial cell proliferation and tubule formation.
- VEGF neutralization inhibited these proangiogenic effects, indicating intracellular VEGF release.
Conclusions:
- Activated human neutrophils directly contribute to angiogenesis via VEGF release.
- This has significant implications for inflammatory diseases, capillary leak syndrome, wound healing, and tumor progression.