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2017 ; 12
(9
): e0184582
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In vivo lineage tracing reveals Axin2-expressing, long-lived cortical thymic
epithelial progenitors in the postnatal thymus
#MMPMID28886197
Tan SH
; Nusse R
PLoS One
2017[]; 12
(9
): e0184582
PMID28886197
show ga
In the thymus, cortical and medullary thymic epithelial cells (TECs) are
instrumental for generating a repertoire of functional T cells. Hence, there has
been much interest in the ontogeny of TECs. While medullary TEC (mTEC) and
bipotent progenitors have been identified, the existence of a cortical TEC (cTEC)
progenitor remains ambiguous. In this study, we used lineage tracing based on a
target gene of the Wnt pathway, Axin2. We found that Axin2 initially labels cells
in both the cortical and medullary compartments. Using Axin2-CreERT2 mice to
track the fate of labelled cells, we identified long-lived cortical TEC
progenitors that give rise to expanding clones and contribute to homeostasis in
postnatal thymus. In contrast, no clonal expansion was found in the medullary or
in the K5K8-double positive compartments. The identification of cTEC progenitors
and their regulation by Wnt signaling have important implications for our
understanding of thymus physiology during homeostasis and TEC-related disorders.