Volume 50, Issue 8 pp. 1690-1701
BLOOD COMPONENTS

Generation of HLA-deficient platelets from hematopoietic progenitor cells

Constança Figueiredo

Constança Figueiredo

From the Institute for Transfusion Medicine, Hannover Medical School, Hannover; the Institute for Transfusion Medicine, University Hospital Essen, Essen; and the German Red Cross Blood Services NSTOB, Institute Springe, Springe, Germany.

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Lilia Goudeva

Lilia Goudeva

From the Institute for Transfusion Medicine, Hannover Medical School, Hannover; the Institute for Transfusion Medicine, University Hospital Essen, Essen; and the German Red Cross Blood Services NSTOB, Institute Springe, Springe, Germany.

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Peter A. Horn

Peter A. Horn

From the Institute for Transfusion Medicine, Hannover Medical School, Hannover; the Institute for Transfusion Medicine, University Hospital Essen, Essen; and the German Red Cross Blood Services NSTOB, Institute Springe, Springe, Germany.

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Britta Eiz-Vesper

Britta Eiz-Vesper

From the Institute for Transfusion Medicine, Hannover Medical School, Hannover; the Institute for Transfusion Medicine, University Hospital Essen, Essen; and the German Red Cross Blood Services NSTOB, Institute Springe, Springe, Germany.

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Rainer Blasczyk

Rainer Blasczyk

These authors contributed equally to the work.

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Axel Seltsam

Axel Seltsam

These authors contributed equally to the work.

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First published: 02 August 2010
Citations: 53
Prof. Dr. Rainer Blasczyk, Institute for Transfusion Medicine, Carl-Neuberg Strasse1, 30625 Hannover, Germany; e-mail: [email protected].

CF designed and performed the experiments and wrote the manuscript, LG and BEV aided in performing experiments and analyzed and interpreted data, PAH analyzed and interpreted data, RB designed parts of the study and contributed to paper writing, and AS designed the study and wrote the manuscript.

Abstract

BACKGROUND: Exposure to allogeneic blood products often leads to the development of human leukocyte antigen (HLA) antibodies. Refractoriness to platelet (PLT) transfusion caused by alloimmunization against HLA Class I antigens constitutes a significant clinical problem.

STUDY DESIGN AND METHODS: We developed an RNA interference (RNAi)-based approach to silence the expression of HLA Class I molecules on PLTs derived from CD34+ progenitor cells. A lentiviral-based system was used to express short-hairpin RNA (shRNA) targeting β2-microglobulin (β2m) transcripts in CD34+ progenitor cells. Differentiation to PLTs was performed by incubating progenitor cells in the presence of thrombopoietin and interleukin-3.

RESULTS: The transduction of RNAi cassettes containing the sequences for shRNAs targeting β2m caused up to 85% reduction of progenitor cells HLA Class I antigen expression, which was maintained in the culture-derived PLTs. The HLA-deficient PLTs derived from HLA-silenced CD34+ cells proved to be fully functional in in vitro tests when compared to peripheral blood–derived PLTs.

CONCLUSIONS: Our data show that in vitro generating HLA Class I–deficient PLTs from hematopoietic progenitor cells prove to be feasible. As malignancy risks associated with insertional mutagenesis are not to be expected in anucleated PLTs, provision of HLA-deficient PLTs from large-scale production units may become reality in the management of patients suffering from PLT transfusion refractoriness.

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