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Related Concept Videos

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The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
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Antiplatelet drugs emerge as frontline defenders against the insidious threat of thromboembolic diseases, where abnormal clots obstruct vital blood vessels. These drugs stand as bulwarks, inhibiting platelet aggregation and clot formation, thereby mitigating the risk of life-threatening conditions like myocardial infarction, coronary artery disease, and thrombotic strokes.
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Related Experiment Video

Updated: Dec 1, 2025

Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets
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Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets

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Calcium Ion Chelation Preserves Platelet Function During Cold Storage.

Binggang Xiang1, Guoying Zhang1, Yan Zhang1

  • 1Gill Heart and Vascular Institute, Division of Cardiovascular Medicine, College of Medicine (B.X., G.Z., Y.Z., C.W., A.J.M., S.S.S., Z.L.), University of Kentucky, Lexington.

Arteriosclerosis, Thrombosis, and Vascular Biology
|November 12, 2020
PubMed
Summary
This summary is machine-generated.

Cold storage of platelets causes rapid clearance due to integrin activation and apoptosis. EGTA treatment prevents this, enabling longer platelet storage and improving transfusion efficacy.

Keywords:
bleeding timecold temperature apoptosishemostaticsplatelet activationplatelet transfusion

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Area of Science:

  • Hematology
  • Transfusion Medicine
  • Biochemistry

Background:

  • Platelet transfusion is critical for treating bleeding disorders.
  • Current room temperature storage limits platelet availability to 5 days due to bacterial contamination and function loss.
  • Cold storage is not feasible as refrigerated platelets are rapidly cleared from circulation.

Purpose of the Study:

  • To elucidate the mechanism of rapid platelet clearance following cold storage.
  • To develop a method for effective cold storage of platelets for transfusion.

Main Methods:

  • Investigated platelet clearance mechanisms after cold storage.
  • Examined the role of integrin activation and apoptosis.
  • Utilized EGTA, a calcium ion chelator, to pretreat platelets.
  • Assessed transfusion efficacy in mouse models.

Main Results:

  • Rapid clearance of cold-stored platelets is primarily mediated by integrin activation and apoptosis.
  • Genetic deficiency in integrin β3 or caspase-3 extended the circulation of cold-stored platelets.
  • EGTA pretreatment inhibited cold storage-induced platelet activation and prolonged platelet circulation.
  • EGTA-treated, cold-stored platelets effectively reduced bleeding times in mice.

Conclusions:

  • Integrin activation and apoptosis are key mechanisms driving rapid clearance of cold-stored platelets.
  • Using a calcium ion chelator like EGTA offers a promising strategy for enabling cold storage of platelets.
  • This approach could significantly improve platelet availability for transfusions.