血小板
血小板活化
免疫学
医学
脾切除术
地中海贫血
T细胞
内科学
免疫系统
内分泌学
脾脏
作者
Elena E. Solomou,Polyxeni Delaporta,Aimilia Mantzou,Marianna Tzannoudaki,Panagiotis Diamantopoulos,Christina Salamaliki,Christina‐Nefeli Kontandreopoulou,Nora-Athina Vyniou,Foteini Perganti,Ioannis Papassotiriou,Antonis Kattamis
标识
DOI:10.1016/j.clim.2023.109653
摘要
A hypercoagulable state leading to increased risk for thrombotic events represents one of the most common complications observed in transfusion-dependent β-thalassemia (TDT) patients. TDT patients have increased frequencies of circulating activated platelets. However, there is no information so far if platelets from TDT patients can activate T cells. In the present study we showed that T cells treated with platelets from TDT patients showed significant increased surface expression of CD69 compared to the T cells treated with platelets from healthy individuals. Patients with splenectomy showed increased T cell activation compared to patients with intact spleen. No T cell activation was observed following incubation with plasma alone, nor with platelets from healthy subjects. The percentages of regulatory T cells (Tregs) were also examined. TDT patients showed statistically significant increased percentages of Tregs compared to healthy controls. Additionally, we observed a positive statistically significant correlation between the percentages of Tregs and the platelet-induced activated T cells in patients who were not treated with aspirin. TDT patients showed increased levels of sP-selectin, suPAR and GDF-15, molecules implicated in platelet activation. We show that platelets from TDT patients can activate T cells in vitro. This activation correlates with markers of platelet activation and increased numbers of Tregs, perhaps in an effort to eliminate immune dysregulation, conceivably secondary to platelet activation.
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