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Transendothelial migration of neutrophils involves integrin-associated protein (CD47)
D Cooper1, F P Lindberg, J R Gamble
1Hanson Centre for Cancer Research, Adelaide, Australia.
Summary
Integrin-associated protein (IAP) is crucial for white blood cell migration during inflammation. Blocking IAP significantly inhibits neutrophil movement into tissues, highlighting its role in inflammatory responses.
Area of Science:
- Immunology
- Cell Biology
- Pathology
Background:
- Inflammation involves white blood cell migration into tissues.
- Neutrophil migration depends on beta 2 integrins (CD18) and PECAM-1 (CD31).
Purpose of the Study:
- To investigate the role of integrin-associated protein (IAP) in neutrophil transendothelial migration.
Main Methods:
- Used monoclonal antibody B6H12 against IAP to block neutrophil migration.
- Stimulated migration using interleukin 8 (IL-8), N-formyl-methionylleucylphenylalanine (FMLP), and tumor necrosis factor alpha (TNF-alpha).
Main Results:
- B6H12 antibody significantly inhibited neutrophil migration stimulated by IL-8 (60%), FMLP (76%), and TNF-alpha (98%).
- The antibody acted on both neutrophils (inhibiting chemotaxis) and endothelium (IL-8-independent process).
- Blocking IAP did not affect adhesion protein expression or IL-8 production.
Conclusions:
- Integrin-associated protein (IAP) is essential for neutrophil transendothelial migration.
- IAP represents a third key molecule involved in neutrophil migration into inflammatory sites.