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. 1992 Jul 1;89(13):6020–6024. doi: 10.1073/pnas.89.13.6020

Detection of rare antigen-presenting cells by the lacZ T-cell activation assay suggests an expression cloning strategy for T-cell antigens.

J Karttunen 1, S Sanderson 1, N Shastri 1
PMCID: PMC402130  PMID: 1378619

Abstract

The alpha/beta T-cell receptor a complex ligand formed by the association of antigenic peptides with molecules of the major histocompatibility complex (MHC). The inherent limitations of the conventional T-cell activation assays used to detect these peptide/MHC ligands have, until now, hampered the development of expression cloning systems for T-cell antigens. To overcome these limitations, we have recently introduced a method for detecting ligand-induced activation of individual T cells. This assay, which makes use of a lacZ reporter construct, differs from conventional ligand-induced activation assays in that it allows the detection of single, activated T cells in large pools of resting cells. We applied the lacZ assay to the problem of screening expression libraries, which requires the ability to detect ligand-bearing antigen-presenting cells when they are present at very low frequency. We show here that ligand-expressing antigen-presenting cells can be detected at frequencies of 1:10(3)-10(4), a level of sensitivity compatible with the screening of cDNA libraries. Furthermore, by using as antigen-presenting cells COS-7 cells stably transfected with the murine Kb class I MHC molecule, we demonstrate that transiently expressed ovalbumin is efficiently processed and presented to an ovalbumin/Kb-specific T-cell hybridoma. lacZ expression is induced in a detectable number of cocultured T cells, even when the ovalbumin cDNA consists of only 1:10(4) of the total DNA used to transfect the COS cells. These results suggest that unknown T-cell antigens may be identified by screening cDNA libraries in MHC-expressing COS cells using lacZ-inducible T cells as indicators of peptide antigen expression.

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Selected References

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