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Modulation of endothelial cell function by antiphospholipid antibodies
P L Meroni1, N Del Papa, B Beltrami
1Istituto de Medicina Interna, Malattie Infettive Immunopatologia, IRCCS Policlinico, Milan, Italy.
Lupus
|October 1, 1996
Summary
Beta 2-glycoprotein I (beta 2-GP-I) binds to endothelial cells, facilitating anti-beta 2-GP-I antibody recognition. This interaction activates endothelial cells, potentially contributing to procoagulant states in antiphospholipid syndrome.
Area of Science:
- Immunology
- Vascular Biology
- Rheumatology
Background:
- Beta 2-glycoprotein I (beta 2-GP-I) is a plasma cofactor for antiphospholipid antibodies.
- Naturally occurring anti-beta 2-GP-I antibodies are found in patients with antiphospholipid syndrome.
Purpose of the Study:
- To investigate the mechanism of beta 2-GP-I binding to endothelial cells.
- To determine the functional consequences of anti-beta 2-GP-I antibody binding to endothelial cells.
Main Methods:
- Studied beta 2-GP-I binding to endothelial monolayers.
- Investigated the role of the phospholipid-binding site in endothelial adhesion.
- Assessed endothelial cell activation markers (adhesion molecules, cytokines, arachidonic acid metabolism) upon antibody complex binding.
Main Results:
- Beta 2-GP-I adheres to endothelial surfaces via its phospholipid-binding site.
- Endothelial cells present bound beta 2-GP-I, enabling anti-beta 2-GP-I antibody binding.
- The beta 2-GP-I/antibody complex activates endothelial cells, upregulating adhesion molecules and pro-inflammatory cytokines.
Conclusions:
- Beta 2-glycoprotein I plays a key role in antibody deposition on endothelium.
- Beta 2-GP-I interaction with antibodies affects endothelial cell function, potentially promoting a procoagulant state.