Clearance and phenotype of extracellular vesicles after red blood cell transfusion in a human endotoxemia model.
Transfus Apher Sci
; 58(4): 508-511, 2019 Aug.
Article
em En
| MEDLINE
| ID: mdl-31253560
ABSTRACT
BACKGROUND:
In the critically ill, extracellular vesicles (EV) from red blood cells (RBC) have been related to adverse effects of blood transfusion. Stored RBC units contain high concentrations of RBC- EVs, thereby increasing the concentration of EVs in the circulation after transfusion. The mechanisms underlying the clearance of donor RBC-EVs after transfusion are unknown. This study investigates whether membrane markers that are associated with clearance of RBCs are also implicated in clearance of RBC-EVs in human endotoxemic recipients of a transfusion.METHODS:
Six volunteers were injected with Escherichia coli lipopolysaccharide, and after two hours transfused with an autologous RBC unit donated 35 days earlier. Samples were collected from the RBC unit and the volunteers before and after transfusion. RBC-EVs were labeled with (anti) glycophorin A, combined with (anti) CD44, CD47, CD55, CD59, CD147, or lactadherin to detect phosphatidylserine (PS) and analyzed on a A50 Micro flow cytometer.RESULTS:
In the RBC unit, RBC-EVs solely exposed PS (7.8%). Before transfusion, circulating RBC-EVs mainly exposed PS (22%) and CD59 (9.1%), the expression of the other membrane markers was much lower. After transfusion, the concentration of RBC- EVs increased 2.4-fold in two hours. Thereafter, the EV concentration decreased towards baseline levels. The fraction of EVs positive for all tested membrane markers decreased after transfusion.CONCLUSION:
Besides a minor fraction of PS-exposing EVs, RBC-EVs produced during storage do not expose detectable levels of RBC membrane markers that are associated with clearance, which is in contrast to the EVs produced by the circulating RBCs.Palavras-chave
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Lipopolissacarídeos
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Transfusão de Eritrócitos
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Endotoxemia
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Escherichia coli
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Vesículas Extracelulares
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Modelos Biológicos
Limite:
Adolescent
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Adult
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Humans
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Male
Idioma:
En
Revista:
Transfus Apher Sci
Assunto da revista:
HEMATOLOGIA
Ano de publicação:
2019
Tipo de documento:
Article