Lactadherin functions as a probe for phosphatidylserine exposure and as an anticoagulant in the study of stored platelets

Vox Sanguinis
Jinxiao HouJialan Shi

Abstract

Annexin V, the long established standard method of measuring phosphatidylserine (PS) exposure, is not the most suitable probe for the study of stored platelets because of calcium dependence and low sensitivity under 8% PS exposure. The aim of this study was to show lactadherin as a sensitive probe for PS exposure and an effective anticoagulant for stored platelets. PS exposure and the associated procoagulant activity of platelets in 20 platelet concentrate units were investigated by flow cytometry, confocal microscopy, coagulation time analysis and enzymatic assays. Annexin V and lactadherin were utilized separately in this study. Using lactadherin, we identified higher levels of PS exposure on the platelets and microparticles compared to detection using annexin V by flow cytometry. Lactadherin staining showed earlier PS exposure localized to platelets membrane in the earlier stage of storage. Subsequently, PS was distributed on the narrow rim of the plasma membrane and blebbing vesicles. Lactadherin or annexin V(32 nm) prolonged coagulation time 2·4 fold versus twofold. The production of thrombin and intrinsic/extrinsic factor Xase were inhibited approximately 85∼90% and 65∼70% by lactadherin and annexin V, respectively. Lacta...Continue Reading

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Related Concepts

Flow Cytometry
Calcium [EPC]
Cancer procoagulant
Annexin A5
Calcium
Phosphatidylserines
F2 gene
Thrombin
ANXA5 gene
Platelet concentrate

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