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2015 ; 43
(5
): 859-69
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Crossreactive ?? T Cell Receptors Are the Predominant Targets of Thymocyte
Negative Selection
#MMPMID26522985
McDonald BD
; Bunker JJ
; Erickson SA
; Oh-Hora M
; Bendelac A
Immunity
2015[Nov]; 43
(5
): 859-69
PMID26522985
show ga
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(-)CD8?(-) 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.