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Implication of transfected cell lines for the detection of alloantibodies against human neutrophil antigen‐3
Author(s) -
Bayat Behnaz,
Tjahjono Yudy,
Werth Silke,
Berghöfer Heike,
Reil Angelika,
Kroll Hartmut,
Sachs Ulrich J.,
Santoso Sentot
Publication year - 2012
Publication title -
transfusion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.045
H-Index - 132
eISSN - 1537-2995
pISSN - 0041-1132
DOI - 10.1111/j.1537-2995.2011.03303.x
Subject(s) - transfection , immunology , antigen , medicine , isoantibodies , cell culture , biology , genetics
BACKGROUND: Alloantibodies against human neutrophil antigen‐3 (HNA‐3) are responsible for the fatalities reported in transfusion‐related acute lung injury. Consequently, reliable detection of these alloantibodies is mandatory to improve blood transfusion safety. In this study, we developed stable cell lines for the detection of HNA‐3 antibodies. STUDY DESIGN AND METHODS: HEK293T were transfected with HNA‐3a or HNA‐3b constructs and sorted by flow cytometry according to high surface expression. Transfected cells were tested with sera containing HNA‐3 antibodies in flow cytometry and antibody capture assay (ACA). The results were compared with granulocyte agglutination test and granulocyte immunofluorescence test. RESULTS: In flow cytometry, 12 of 14 HNA‐3a sera reacted specifically with HNA‐3aa cells. One serum sample showed positive reaction with HNA‐3bb cells. All HNA‐3b sera recognized HNA‐3bb cells. No reaction was observed with broad reactive antibodies against HLA Class I. In ACA, all HNA‐3a sera (12/12) showed positive reactivity with HNA‐3aa cells with no cross‐reactivity with HNA‐3bb cells. Again, all HNA‐3b sera reacted with HNA‐3bb cells only. Furthermore, genotyping of 249 individuals detected a new HNA‐3 allele caused by a nucleotide substitution C>T at Position 457 leading to L 153 F mutation in choline transporter‐like protein‐2. This mutation impairs polymerase chain reaction with sequence‐specific primers based HNA‐3a typing. However, analysis with cells expressing F 153 isoform showed that this mutation did not alter the binding of HNA‐3 antibodies. CONCLUSIONS: This study demonstrated that HEK293T cells expressing stable recombinant HNA‐3 are suitable for the detection of HNA‐3 alloantibodies allowing reliable screening of blood products.