Platelet activation and platelet–leukocyte interaction in β-thalassemia/hemoglobin E patients with marked nucleated erythrocytosis
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ID: 117919
2012
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Abstract
Patients with thalassemia, an inherited hemolytic anemia, have increased risk of hypercoagulable complications. A whole blood flow cytometric (FCM) method has been used for studies of platelet activation and platelet–leukocyte aggregation in these patients. However, this FCM method presents technical difficulties because of the high proportion of immature red blood cells (RBCs) in these patients. A protocol for the simultaneous measurement of platelet activation and their aggregation with leukocyte populations in whole blood using four-color FCM which excluded immature RBC was devised, and evaluated for the evaluation of platelet function in patients with β-thalassemia/hemoglobin E (HbE). Whole blood from these patients and from healthy volunteers was stained for platelet activation and platelet–leukocyte aggregates using anti-CD42a, anti-CD62P, anti-CD45 and glycophorin A (GPA) conjugated with different fluorochromes. Our FCM method is simple, effective and based on the assumption that GPA is present on all immature RBCs, but is not expressed on CD45+ leukocytes. Results from the studies showed that blood samples from these patients contained a high frequency of circulating activated platelets (CD42a+/CD62P+) when compared to samples from healthy individuals. The percentage of platelet–neutrophil, platelet–monocyte—but not platelet–lymphocyte—aggregates were also elevated in both thalassemia genotypes with marked increase in patients who had undergone splenectomy. These findings suggest that platelets adhere to neutrophils and monocytes are activated which support the clinical observation that splenectomized thalassemia patients have an increased risk of arterial or venous thrombotic manifestations.
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keawvichit2012annalsplatelet
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| Authors | Rassamon Keawvichit;Ladawan Khowawisetsut;Porntip Chaichompoo;Korakot Polsrila;Suchana Sukklad;Kasama Sukapirom;Archrob Khuhapinant;Suthat Fucharoen;Kovit Pattanapanyasat;Rassamon Keawvichit;Ladawan Khowawisetsut;Porntip Chaichompoo;Korakot Polsrila;Suchana Sukklad;Kasama Sukapirom;Archrob Khuhapinant;Suthat Fucharoen;Kovit Pattanapanyasat; |
| Journal | Annals of hematology |
| Year | 2012 |
| DOI |
doi:10.1007/s00277-012-1522-2
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