OBJECTIVE: Platelet transfusion is a life-saving therapy to prevent or treat bleeding in patients with thrombocytopenia or platelet dysfunction. However, for >6 decades, safe and effective strategies for platelet storage have been an impediment to widespread use of platelet transfusion. Refrigerated platelets are cleared rapidly from circulation, precluding cold storage of platelets for transfusion. Consequently, platelets are stored at room temperature with an upper limit of 5 days due to risks of bacterial contamination and loss of platelet function. This practice severely limits platelet availability for transfusion. This study is to identify the mechanism of platelet clearance after cold storage and develop a method for platelet cold storage. APPROACH AND RESULTS: We found that rapid clearance of cold-stored platelets was largely due to integrin activation and apoptosis. Deficiency of integrin β3 or caspase-3 prolonged cold-stored platelets in circulation. Pretreatment of platelets with EGTA, a cell impermeable calcium ion chelator, reversely inhibited cold storage-induced platelet activation and consequently prolonged circulation of cold-stored platelets. Moreover, transfusion of EGTA-treated, cold-stored platelets, but not room temperaturestored platelets, into the mice deficient in glycoprotein Ibα significantly shortened tail-bleeding times and diminished blood loss. CONCLUSIONS: Integrin activation and apoptosis is the underlying mechanism of rapid clearance of platelets after cold storage.
|Number of pages
|Arteriosclerosis, Thrombosis, and Vascular Biology
|Published - Jan 2021
Bibliographical noteFunding Information:
B. Xiang is supported by American Heart Association Great Rivers Affiliate Scientist Development Grant. C. Wu is supported by an K99/R00 grant (K99HL145117; National Heart, Lung, and Blood Institute [NHLBI]). Z. Li is supported by National Institutes of Health (NIH)/NHLBI R01 HL142640 and R01HL146744, and NIH/NIGMS R01 GM132443.
© 2020 American Heart Association, Inc.
- Bleeding time
- Cold temperature apoptosis
- Platelet activation
- Platelet transfusion
ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine