Volume 174, Issue 2 p. 310-320
Research Paper

Glycosylation pattern of anti-platelet IgG is stable during pregnancy and predicts clinical outcome in alloimmune thrombocytopenia

Myrthe E. Sonneveld

Myrthe E. Sonneveld

Department of Experimental Immunohaematology, Sanquin Research and Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands

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Suvi Natunen

Suvi Natunen

Finnish Red Cross Blood Service, Helsinki, Finland

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Susanna Sainio

Susanna Sainio

Finnish Red Cross Blood Service, Helsinki, Finland

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Carolien A. M. Koeleman

Carolien A. M. Koeleman

Centre for Proteomics and Metabolomics, Leiden University Medical Centre, Leiden, The Netherlands

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Stephanie Holst

Stephanie Holst

Centre for Proteomics and Metabolomics, Leiden University Medical Centre, Leiden, The Netherlands

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Gillian Dekkers

Gillian Dekkers

Department of Experimental Immunohaematology, Sanquin Research and Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands

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Joke Koelewijn

Joke Koelewijn

Department of Experimental Immunohaematology, Sanquin Research and Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands

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Jukka Partanen

Jukka Partanen

Finnish Red Cross Blood Service, Helsinki, Finland

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C. Ellen van der Schoot

C. Ellen van der Schoot

Department of Experimental Immunohaematology, Sanquin Research and Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands

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Manfred Wuhrer

Manfred Wuhrer

Centre for Proteomics and Metabolomics, Leiden University Medical Centre, Leiden, The Netherlands

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Gestur Vidarsson

Corresponding Author

Gestur Vidarsson

Department of Experimental Immunohaematology, Sanquin Research and Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands

Correspondence: Dr. Gestur Vidarsson, Department of Experimental Immunohaematology, Sanquin Research, and Landsteiner Laboratory, Plesmanlaan 125, 1066 CX Amsterdam, The Netherlands.

E-mail: [email protected]

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First published: 28 March 2016
Citations: 76

Abstract

Fetal or neonatal alloimmune thrombocytopenia (FNAIT) is a potentially life-threatening disease where fetal platelets are destroyed by maternal anti-platelet IgG alloantibodies. The clinical outcome varies from asymptomatic, to petechiae or intracranial haemorrhage, but no marker has shown reliable correlation with severity, making screening for FNAIT impractical and highly inefficient. We recently found IgG Fc-glycosylation towards platelet and red blood cell antigens to be skewed towards decreased fucosylation, increased galactosylation and sialylation. The lowered core-fucosylation increases the affinity of the pathogenic antibodies to FcγRIIIa and FcγRIIIb, and hence platelet destruction. Here we analysed the N-linked glycans of human platelet antigen (HPA)-1a specific IgG1 with mass spectrometry in large series of FNAIT cases (n = 166) including longitudinal samples (n = 26). Besides a significant decrease in Fc-fucosylation after the first pregnancy (P = 0·0124), Fc-glycosylation levels remained stable during and after pregnancy and in subsequent pregnancies. Multiple logistic regression analysis identified anti-HPA-1a –fucosylation (P = 0·006) combined with galactosylation (P = 0·021) and antibody level (P = 0·038) correlated with bleeding severity, making these parameters a feasible marker in screening for severe cases of FNAIT.

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