Polystyrene beads coated with antibodies directed to HLA class I intracytoplasmic domain: the use in quantitative measurement of peptide-HLA class I binding by flow cytometry |
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Authors: | Chersi A Rosano L Tanigaki N |
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Affiliation: | a Istituto Regina Elena for Cancer Research, Rome, Italy b Roswell Park Cancer Institute, Buffalo, New York, USA |
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Abstract: | Protein-reactive, conformation-independent anti-peptide antibodies were raised in rabbits against a C-terminal sequence SDSAQGSDVSLA, common to most HLA-A and -B locus products. Antibodies were coupled to 4.5-μm polystyrene beads through the Fc portion by the use of protein A. The antibody-coupled beads showed a high capacity to bind HLA-A and -B proteins as well as their chains by the intracytoplasmic domain, keeping the extracellular domains solvent exposed. The density of HLA class I proteins bound on the beads was approximately the same as that on cultured B cells. The antibody beads made it possible to quantitate peptide-HLA class I binding, i.e., in vitro HLA class I assembly by flow cytometry. The assembly rate determined by the provisionally called flow cytometric HLA class I assay was 15%–19% for the reassembly of dissociated HLA class I proteins with the released selfpeptides. With single synthetic peptides, the highest rate so far obtained was 6.5%. The assay specificity and reproducibility were satisfactory. |
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Keywords: | HLA class I polystyrene beads flow cytometry |
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