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Generation of procoagulant collagen‐ and thrombin‐activated platelets in platelet concentrates derived from buffy coat: the role of processing, pathogen inactivation, and storage
Author(s) -
Bertaggia Calderara Debora,
Crettaz David,
Aliotta Alessandro,
Barelli Stefano,
Tissot JeanDaniel,
Prudent Michel,
Alberio Lorenzo
Publication year - 2018
Publication title -
transfusion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.045
H-Index - 132
eISSN - 1537-2995
pISSN - 0041-1132
DOI - 10.1111/trf.14883
Subject(s) - buffy coat , platelet , plateletpheresis , chemistry , stimulation , thrombin , adenosine diphosphate , platelet activation , adenosine triphosphate , biochemistry , pharmacology , immunology , andrology , apheresis , endocrinology , biology , platelet aggregation , medicine
BACKGROUND Collagen‐ and thrombin‐activated (COAT) platelets (PLTs), generated by dual‐agonist stimulation with collagen and thrombin (THR), enhance THR generation at the site of vessel wall injury. There is evidence that higher amounts of procoagulant COAT PLTs are associated with stroke, while a decreased ability to generate them is associated with bleeding diathesis. Our aim was to study PLT functions, particularly the ability to generate COAT PLTs, in PLT concentrates (PCs) from buffy coat. Thus, we investigated the effect of processing, pathogen inactivation treatment (amotosalen‐UVA), and PC storage. STUDY DESIGN AND METHODS Two PCs from five donors each were pooled and split in two bags; one of them was pathogen inactivated and the other one was left untreated (n = 5). Flow cytometric analyses were performed immediately after PC preparation (Day 1) and thereafter on Days 2, 5, 7, and 9 in treated and untreated PCs to measure the reactivity of PLTs (CD62P and PAC‐1), the content and secretion of dense granule after stimulation with different agonists, and the percentage of COAT PLTs after dual stimulation with convulxin (agonist of the collagen receptor GPVI) and THR. RESULTS Preparation of PCs resulted in a significant decrease of COAT PLTs and in an impaired response to adenosine 5′‐diphosphate sodium (ADP). Storage further decreased ADP response. Minor differences were observed between untreated or amotosalen‐UVA–treated PCs. CONCLUSION Preparation of PCs from buffy coats decreased the ability to generate COAT PLTs and impaired PLT response to ADP.