Related Experiment Videos
Characterization of protein disulphide isomerase released from activated platelets
K Chen1, T C Detwiler, D W Essex
1Department of Biochemistry, State University of New York, Brooklyn 11203, USA.
British Journal of Haematology
|June 1, 1995
Summary
Activated platelets release protein disulphide isomerase (PDI). This study purified platelet PDI, confirmed its identity, and showed its release upon platelet activation, suggesting a role in hemostasis and tissue repair.
Area of Science:
- Biochemistry
- Hematology
- Cell Biology
Background:
- Platelets play a crucial role in hemostasis and tissue repair.
- Protein disulphide isomerase (PDI) is an enzyme involved in protein folding and redox regulation.
Purpose of the Study:
- To investigate the release and function of protein disulphide isomerase (PDI) from activated platelets.
- To characterize the PDI found in platelets and its localization on the platelet surface.
Main Methods:
- Purification of PDI from human platelets.
- Generation of rabbit antibodies against platelet PDI.
- Assessment of PDI release using thrombin and calcium ionophore.
- Electron microscopy and flow cytometry to determine PDI localization and release mechanism.
Main Results:
- Platelet PDI shares characteristics with other human PDIs.
- Platelet activation releases immunologically identical PDI.
- Thrombin and calcium ionophore induce PDI release (10% and 20% respectively).
- PDI is present on the external platelet surface and released via vesiculation upon activation.
Conclusions:
- Activated platelets release protein disulphide isomerase (PDI).
- Platelet PDI may contribute to hemostatic and tissue remodeling processes at sites of vascular injury.