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Leukocyte crosstalk at the vascular wall
1Division of Hematology-Oncology, New England Medical Center, Boston, MA 02111, USA. bfurie@earl.hemonc.nemc.org
Thrombosis and Haemostasis
|July 1, 1997
Summary
P-selectin, a molecule on platelets and endothelial cells, plays a role in cell interactions and signaling. Its phosphorylation in platelets is being investigated for its biological significance in monocyte activation and tissue factor production.
Area of Science:
- Biochemistry
- Cell Biology
- Immunology
Background:
- P-selectin is a key adhesion molecule expressed on platelets and endothelial cells.
- It mediates crucial interactions between leukocytes, platelets, and endothelial cells.
- P-selectin is implicated in cell signaling and communication, including rapid phosphorylation upon platelet activation.
Purpose of the Study:
- To investigate the unknown biological role of P-selectin phosphorylation events within platelets.
- To understand P-selectin's role in initiating monocyte activation and subsequent cytokine biosynthesis.
Main Methods:
- Analysis of P-selectin phosphorylation and dephosphorylation dynamics.
- Investigating P-selectin's interaction with monocyte receptors, specifically PSGL-1.
- Assessing the initiation of de novo tissue factor and cytokine biosynthesis in monocytes.
Main Results:
- P-selectin mediates cell-cell recognition and is involved in cell signaling.
- Upon platelet activation, P-selectin undergoes rapid phosphorylation and dephosphorylation.
- P-selectin interaction with monocyte PSGL-1 triggers tissue factor and cytokine production, independent of CD14.
Conclusions:
- P-selectin phosphorylation in platelets warrants further investigation for its functional significance.
- P-selectin-mediated signaling via PSGL-1 is a critical pathway for monocyte activation and inflammatory responses.
- This pathway highlights a mechanism for initiating tissue factor biosynthesis independently of LPS.