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Signaling through CD31 protects endothelial cells from apoptosis.
P C Evans1, E R Taylor, P J Kilshaw
1Molecular Immunology Programme, The Babraham Institute, Cambridge, UK.
Transplantation
|March 10, 2001
Summary
Signaling through CD31 (platelet-endothelial cell adhesion molecule-1) protects endothelial cells from apoptosis. This process involves up-regulating protective genes like A20 and A1, crucial for long-term graft survival.
Area of Science:
- Immunology
- Cell Biology
- Vascular Biology
Background:
- Endothelial damage contributes to chronic rejection.
- Protective genes (A20, A1, bcl-xl, HO-1) in endothelium correlate with graft survival.
- Overexpression of these genes protects endothelial cells from apoptosis and inflammation via NF-kappaB inactivation.
Purpose of the Study:
- To investigate the role of CD31 (platelet-endothelial cell adhesion molecule-1) signaling in endothelial cell protection.
- To determine if CD31 cross-linking influences the expression of protective genes and transcription factors.
Main Methods:
- Utilized a monoclonal antibody (LCI-4) to cross-link CD31 on cultured endothelial cells.
- Assessed endothelial cell apoptosis following serum starvation.
- Measured mRNA levels of A20 and A1.
- Analyzed the activation of transcription factor Sp-1.
Main Results:
- Treatment with LCI-4 protected serum-starved endothelial cells from apoptosis.
- CD31 cross-linking elevated A20 and A1 mRNA levels.
- CD31 signaling activated the transcription factor Sp-1.
Conclusions:
- Signaling through CD31 on endothelial cells confers protection from apoptosis.
- This protection is associated with the up-regulation of protective molecules A20 and A1.
- CD31-mediated signaling may represent a therapeutic target for preventing chronic rejection.