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Blood group‐related antigen Le y on human platelets and its involvement in platelet aggregation via a possible interaction with CD61
Author(s) -
Zhu Huijun,
Ma Qinqin,
Li Ruishu,
Fu Min,
Lu Ping
Publication year - 2020
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.15981
Subject(s) - platelet , abo blood group system , flow cytometry , chemistry , platelet membrane glycoprotein , microbiology and biotechnology , antigen , monoclonal antibody , epitope , immunofluorescence , western blot , platelet activation , antibody , glycoprotein , immunoprecipitation , immunology , biochemistry , biology , gene
Background The Le y antigen is a carbohydrate chain belonging to the ABH‐Lewis blood group family. Le y has been reported to be present on red blood cells (RBCs) and granulocytes, but its distribution and function in platelets remain unknown. There are a variety of glycoproteins on platelets, which may carry the Le y antigen. This study aims to investigate the expression pattern and the function of Le y in human platelets. Study design and methods Flow cytometry, Western blot, and immunofluorescence assays were performed to determine Le y expression on human platelets. ADP (1.25‐10 μM) and thrombin (0.05‐1 IU/mL) were used to activate platelets in the presence or absence of prostaglandin E1 (PGE1) and the Le y expression was evaluated again by flow cytometry. Blockade was performed with an anti‐Le y monoclonal antibody to verify the role of this epitope in platelet function. Finally, coimmunoprecipitation was performed to identify glycoproteins associated with Le y . Results Le y was expressed on human platelets independent of ABO blood type. Le y expression was decreased in a dose‐dependent manner after activation with either ADP or thrombin, and this effect could be partially reversed by PGE1. Anti‐ Le y mAb treatment increased alpha‐granule release and neutralized the inhibitory effect of the anti‐CD61 antibody on platelet aggregation. In addition, Le y was proven to interact and colocalize with CD61. Conclusions These results demonstrate nondifferential expression of Le y in platelets of different ABO blood types and suggest the involvement of Le y in platelet function, possibly via interaction with CD61.