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We have synthesized a recombinant gene encoding a single-chain HLA-A2/beta 2-microglobulin (beta 2m) molecule by linking beta 2m through its carboxyl terminus via a short peptide spacer to HLA-A2 (A*0201). This gene has been expressed in the beta 2m-deficient colorectal tumor cell line DLD-1. Transfection of this cell with the single-chain construct was associated with conformationally correct cell surface expression of a class I molecule of appropriate molecular mass. The single-chain HLA class I molecule presented either exogenously added peptide or (after interferon-gamma treatment) endogenously processed antigen to an influenza A matrix-specific, HLA-A2-restricted cytotoxic T-lymphocyte line. The need for interferon gamma for the processing and presentation of endogenous antigen suggests that DLD-1 has an antigen-processing defect that can be up-regulated, a feature that may be found in other carcinomas. Our data indicate that single-chain HLA class I constructs can form functional class I molecules capable of presenting endogenously processed antigens. Such molecules should be of use for functional studies, as well as providing potential anticancer immunotherapeutic agents or vaccines.

Original publication

DOI

10.1073/pnas.93.1.236

Type

Journal article

Journal

Proc Natl Acad Sci U S A

Publication Date

09/01/1996

Volume

93

Pages

236 - 240

Keywords

Amino Acid Sequence, Antigen-Presenting Cells, Base Sequence, Cell Line, DNA Primers, HLA-A2 Antigen, Humans, Lymphocyte Cooperation, Molecular Sequence Data, Oligopeptides, Recombinant Fusion Proteins, Signal Transduction, T-Lymphocytes, Cytotoxic, Transfection, beta 2-Microglobulin