Crossreactive αβ T Cell Receptors Are the Predominant Targets of Thymocyte Negative Selection

Benjamin D. McDonald, Jeffrey J. Bunker, Steven A. Erickson, Masatsugu Oh-Hora, Albert Bendelac

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    Abstract

    The precise impact of thymic positive and negative selection on the T cell receptor (TCR) repertoire remains controversial. Here, we used unbiased, high-throughput cloning and retroviral expression of individual pre-selection TCRs to provide a direct assessment of these processes at the clonal level in vivo. We found that 15% of random TCRs induced signaling and directed positive (7.5%) or negative (7.5%) selection, depending on strength of signal, whereas the remaining 85% failed to induce signaling or selection. Most negatively selected TCRs exhibited promiscuous crossreactivity toward multiple other major histocompatibility complex (MHC) haplotypes. In contrast, TCRs that were positively selected or non-selected were minimally crossreactive. Negative selection of crossreactive TCRs led to clonal deletion but also recycling into intestinal CD4-CD8β- intraepithelial lymphocytes (iIELs). Thus, broadly crossreactive TCRs arise at low frequency in the pre-selection repertoire but constitute the primary drivers of thymic negative selection and iIEL lineage differentiation.

    Original languageEnglish
    Pages (from-to)859-869
    Number of pages11
    JournalImmunity
    Volume43
    Issue number5
    DOIs
    Publication statusPublished - Nov 17 2015

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    All Science Journal Classification (ASJC) codes

    • Immunology and Allergy
    • Immunology
    • Infectious Diseases

    Cite this

    McDonald, B. D., Bunker, J. J., Erickson, S. A., Oh-Hora, M., & Bendelac, A. (2015). Crossreactive αβ T Cell Receptors Are the Predominant Targets of Thymocyte Negative Selection. Immunity, 43(5), 859-869. https://doi.org/10.1016/j.immuni.2015.09.009