Alloimmunization against Iy, a low-frequency antigen on platelet glycoprotein Ib/IX as a cause of severe neonatal alloimmune thrombocytopenic purpura.

Abstract:

:Neonatal alloimmune thrombocytopenia (NAIT) is usually induced by platelet-specific antibodies against HPA-1a (Zwa) or HPA-5b (Bra). Recently, low-frequency alloantigens on the platelet glycoprotein (GP) IIb/IIIa complex have been discovered as a cause for NAIT. In this report, a new low-frequency platelet-specific alloantigen, Iy, is described which induced severe NAIT. The corresponding antigen was detected in 1/249 unrelated German blood donors. Antibody binding assays with trypsin-digested platelets (ELISA, immunoprecipitation with biotin-labelled platelets) indicate that the antigen is not localized on the glycocalicin moiety of GP Ib alpha, but may be situated on the remnant moiety of GP Ib alpha, GP IX or GPIb beta. Apparently, Iy is not related to the HPA-2 (Ko) antigen system.

journal_name

Vox Sang

journal_title

Vox sanguinis

authors

Kiefel V,Vicariot M,Giovangrandi Y,Kroll H,Böhringer M,Greinacher A,Breitfeld C,Santoso S,Mueller-Eckhardt C

doi

10.1111/j.1423-0410.1995.tb02604.x

subject

Has Abstract

pub_date

1995-01-01 00:00:00

pages

250-4

issue

3

eissn

0042-9007

issn

1423-0410

journal_volume

69

pub_type

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