Ultrasensitive quantification of TAP-dependent antigen compartmentalization in scarce primary immune cell subsets

Hanna Fischbach, Marius Döring, Daphne Nikles, Elisa Lehnert, Christoph Baldauf, Ulrich Kalinke () and Robert Tampé ()
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Hanna Fischbach: Institute of Biochemistry, Biocenter, Goethe-University Frankfurt
Marius Döring: Institute for Experimental Infection Research, TWINCORE, Centre for Experimental and Clinical Infection Research, a joint venture between the Helmholtz-Centre for Infection Research and the Hannover Medical School, Feodor-Lynen Str. 7-9, 30625 Hannover, Germany
Daphne Nikles: Institute of Biochemistry, Biocenter, Goethe-University Frankfurt
Elisa Lehnert: Institute of Biochemistry, Biocenter, Goethe-University Frankfurt
Christoph Baldauf: Institute of Biochemistry, Biocenter, Goethe-University Frankfurt
Ulrich Kalinke: Institute for Experimental Infection Research, TWINCORE, Centre for Experimental and Clinical Infection Research, a joint venture between the Helmholtz-Centre for Infection Research and the Hannover Medical School, Feodor-Lynen Str. 7-9, 30625 Hannover, Germany
Robert Tampé: Institute of Biochemistry, Biocenter, Goethe-University Frankfurt

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract Presentation of peptides on major histocompatibility complex class I (MHC I) is essential for the establishment and maintenance of self-tolerance, priming of antigen-specific CD8+ T cells and the exertion of several T-cell effector functions. Cytosolic proteasomes continuously degrade proteins into peptides, which are actively transported across the endoplasmic reticulum (ER) membrane by the transporter associated with antigen processing (TAP). In the ER lumen antigenic peptides are loaded onto MHC I, which is displayed on the cell surface. Here we describe an innovative flow cytometric approach to monitor time-resolved ER compartmentalization of antigenic peptides. This assay allows the analysis of distinct primary human immune cell subsets at reporter peptide concentrations of 1 nM. Thus, this ultrasensitive method for the first time permits quantification of TAP activity under close to physiological conditions in scarce primary cell subsets such as antigen cross-presenting dendritic cells.

Date: 2015
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DOI: 10.1038/ncomms7199

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