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Identification, Isolation, and Culture of HLA-A2-Specific B Lymphocytes Using MHC Class I Tetramers ¹

Department of Immunohaematology and Bloodtransfusion, Leiden University Medical Center, Leiden, The Netherlands

Characterizing the individual B cells that participate in the production of anti-HLA Abs requires isolation and culture of these cells and a suitable assay for detection of Abs produced in these B cell cultures. We previously showed that B cell precursors, programmed for anti-HLA Ab secretion, are present at measurable frequencies in peripheral blood of women immunized by pregnancy. In this study, we show that tetrameric HLA-A2, although designed for characterization of CTLs, provides a suitable affinity ligand for isolation of allospecific B cells, which subsequently can be induced to produce HLA-A2 Ab in a CD40-driven culture system. The validity of this concept was established by assaying human hybridomas, producing anti-HLA Abs, for specific tetrameric HLA-A2 binding. The availability of anti-HLA Ab-producing B cell cultures that are established without immortalization will be of value when T-B cell interaction is studied at an alloantigen-specific level.

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