Abstract
Immune-mediated platelet refractoriness (PR) remains a significant problem in the setting of platelet transfusion and is predominantly caused by the presence of alloantibodies directed against class I human leukocyte antigens (HLA). Opsonization of donor platelets with these alloantibodies can result in rapid clearance after transfusion via multiple mechanisms, including antibody dependent cellular phagocytosis (ADCP). Interestingly, not all alloimmunized patients develop PR to unmatched platelet transfusions, suggesting variation in HLA-specific IgG responses between patients. Previously, we observed that the glycosylation profile of anti-HLA antibodies was highly variable between PR patients, especially with respect to Fc galactosylation, sialylation and fucosylation. In the current study, we investigated the effect of different Fc glycosylation patterns, with known effects on complement deposition and FcγR binding, on phagocytosis of opsonized platelets by monocyte-derived human macrophages. We found that the phagocytosis of antibody- and complement-opsonized platelets, by monocyte derived M1 macrophages, was unaffected by these qualitative IgG-glycan differences.
Original language | English |
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Article number | 2129604 |
Pages (from-to) | 1-9 |
Journal | Platelets |
Volume | 34 |
Issue number | 1 |
DOIs | |
Publication status | Published - Jan 2023 |
Bibliographical note
Funding Information:This work was supported by Stichting Sanquin Bloedvoorziening (PPO 17-44). The authors would like to thank Rick Kapur, Leendert Porcelijn, C. Ellen van der Schoot and Masja de Haas for constructive feedback during discussions and the Sanquin Research Central Facility for their technical assistance with conventional and imaging flow cytometry.
Publisher Copyright:
© 2022 The Author(s). Published with license by Taylor & Francis Group, LLC.
Funding
This work was supported by Stichting Sanquin Bloedvoorziening (PPO 17-44). The authors would like to thank Rick Kapur, Leendert Porcelijn, C. Ellen van der Schoot and Masja de Haas for constructive feedback during discussions and the Sanquin Research Central Facility for their technical assistance with conventional and imaging flow cytometry.
Keywords
- Alloimmunization
- anti-HLA
- Fc glycosylation
- phagocytosis
- platelet transfusion