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Platelet storage: changes in cytosolic Ca2+ actin polymerization and shape.
H Feinberg1, M M Sarin, E A Batka
1Department of Pharmacology, University of Illinois, Chicago 60612.
Blood
|August 1, 1988
Summary
Platelet shape loss during storage is linked to changes in actin polymerization and calcium levels (Cai). Actin polymerization closely correlates with shape change, while Cai also influences shape and actin dynamics.
Area of Science:
- Hematology
- Biochemistry
- Cell Biology
Background:
- Platelets are crucial for hemostasis.
- Platelet storage leads to gradual loss of their characteristic disc shape.
- Understanding storage-induced changes is vital for transfusion medicine.
Purpose of the Study:
- To investigate the relationship between platelet shape, cytosolic calcium (Cai), and actin polymerization during storage.
- To quantify changes in Cai and actin polymerization over 10 days of platelet concentrate storage.
Main Methods:
- Platelet concentrates were stored for up to 10 days.
- Cytosolic Ca2+ (Cai) was measured using fura-2 fluorescence.
- Platelet shape was assessed by light scattering intensity.
- Actin polymerization (G/T ratio) was determined using a DNase inhibition assay.
Main Results:
- Actin polymerization initially increased then significantly decreased during storage.
- Platelet shape changed inversely to actin polymerization.
- Cytosolic Ca2+ levels showed an initial drop followed by an increase.
- Strong correlations were observed between shape change, actin polymerization, and Cai levels.
Conclusions:
- Actin polymerization, platelet shape, and Cai levels change in a coordinated manner during storage.
- These interconnected changes impact platelet function and morphology post-transfusion.
- Further research may lead to improved platelet storage strategies.