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Please use this identifier to cite or link to this item: http://repository.li.mahidol.ac.th/dspace/handle/123456789/57751
Title: Hemoglobin-bound platelets correlate with the increased platelet activity in hemoglobin E/β-thalassemia
Authors: Attaphon Chamchoi
Sirada Srihirun
Kittiphong Paiboonsukwong
Thanaporn Sriwantana
Peerawich Kongkaew
Suthat Fucharoen
Kovit Pattanapanyasat
Nathawut Sibmooh
Mahidol University
Faculty of Medicine, Siriraj Hospital, Mahidol University
Keywords: Biochemistry, Genetics and Molecular Biology;Medicine
Issue Date: 1-Jan-2020
Citation: International Journal of Laboratory Hematology. (2020)
Abstract: © 2020 John Wiley & Sons Ltd Introduction: An increase in platelet activity is a contributing factor to vascular complications in hemoglobin E/β-thalassemia (HbE/β-thal). Plasma-free hemoglobin (Hb) increases in HbE/β-thal patients and correlates with platelet activation, but the levels of Hb-bound platelets have never been reported. In this study, we aimed to investigate the levels of Hb-bound platelets and its association with platelet activity in HbE/β-thal patients. Methods: Hb-bound platelets were measured by flow cytometry in 22 healthy subjects and 26 HbE/β-thal patients (16 nonsplenectomized and 10 splenectomized HbE/β-thal patients). Plasma Hb was measured by the chemiluminescence method based on the consumption of nitric oxide (NO) by Hb. Expression of P-selectin and activated glycoprotein (aGP) IIb/IIIa on platelets was measured by flow cytometry as a marker of platelet activity. Results: Both nonsplenectomized and splenectomized HbE/β-thal patients had higher levels of Hb-bound platelets and plasma Hb than healthy subjects. In vitro incubation of dialyzed Hb from patients with platelets of healthy subjects caused an increase in Hb-bound platelets, which was partially inhibited by anti-GPIbα antibody. Plasma Hb positively correlated with Hb-bound platelets. Platelet P-selectin expression at baseline and in response to adenosine diphosphate (ADP, 1 µM) stimulation was higher in nonsplenectomized and splenectomized HbE/β-thal patients than healthy subjects. The ADP-induced aGPIIb/IIIa expression on platelets was also higher in HbE/β-thal patients than healthy subjects. Hb-bound platelets correlated with baseline P-selectin expression and ADP-induced P-selectin expression. Conclusion: HbE/β-thal patients have increased Hb-bound platelets, which is associated with increased baseline platelet activation and reactivity.
URI: http://repository.li.mahidol.ac.th/dspace/handle/123456789/57751
metadata.dc.identifier.url: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85086436705&origin=inward
ISSN: 1751553X
17515521
Appears in Collections:Scopus 2020

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