Abstract:
:Platelet concentrates were pretreated with a stable synthetic prostacyclin analogue (Iloprost) at two different concentrations before the second centrifugation step (pelleting step) of preparation. This resulted in loss of platelet sensitivity to aggregating agents. To mimic the situation after transfusion and to assess the reversibility of platelet inhibition, platelets were washed during and after storage and resuspended in fresh-frozen autologous plasma. The Iloprost-treated and washed platelets exhibited an increased sensitivity to the aggregating agents, compared with the control platelets (p less than 0.01). Post-storage recovery of the synergistic aggregation was more than 80% of prestorage aggregation. Beta-thromboglobulin (beta TG) release and thromboxane B2 (TXB2) formation were significantly inhibited in Iloprost-treated platelets (p less than 0.01). After the second centrifugation step, beta TG release was 0.7% +/- 0.3%, compared with 2.7% +/- 0.9% for the controls. TXB2 was 99 +/- 91 pg/ml, compared with 495 +/- 356 pg/ml for the controls. Platelet morphology and ultrastructure were well preserved during 5-day storage. In addition, Iloprost exerted a cytoprotective effect, as evidenced by the significant reduction in lactate dehydrogenase leakage. Post-storage LDH was 378 +/- 159 and 415 +/- 239 U/l respectively by the two Iloprost concentrations, compared with 1180 +/- 937 U/l for the control platelets. The inhibitory and cytoprotective effects of Iloprost were sustained throughout storage, in contrast to the effect of PGE1 (Prostin) which was limited to the early phase of storage.
journal_name
Ann Hematoljournal_title
Annals of hematologyauthors
Elias M,Heethuis A,Weggemans M,Bom V,Blom N,McShine RL,Halie MR,Smit Sibinga CTdoi
10.1007/BF01695474subject
Has Abstractpub_date
1992-06-01 00:00:00pages
292-8issue
6eissn
0939-5555issn
1432-0584journal_volume
64pub_type
杂志文章abstract::The practical usefulness of Helicobacter pylori eradication for immune thrombocytopenia (ITP) patients is still controversial. However, some ITP patients respond to H. pylori eradication. We conducted a multi-center, open label, prospective phase II study to define the efficacy and toxicities of H. pylori eradication ...
journal_title:Annals of hematology
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journal_title:Annals of hematology
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