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2014 ; 44
(9
): 2712-20
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Both retention and recirculation contribute to long-lived regulatory T-cell
accumulation in the thymus
#MMPMID24894919
Yang E
; Zou T
; Leichner TM
; Zhang SL
; Kambayashi T
Eur J Immunol
2014[Sep]; 44
(9
): 2712-20
PMID24894919
show ga
Natural Treg cells acquire their lineage-determining transcription factor Foxp3
during development in the thymus and are important in maintaining immunologic
tolerance. Here, we analyzed the composition of the thymic Treg-cell pool using
RAG2-GFP/FoxP3-RFP dual reporter mice and found that a population of long-lived
GFP(-) Treg cells exists in the thymus. These long-lived Treg cells substantially
increased with age, to a point where they represent >90% of the total thymic
Treg-cell pool at 6 months of age. In contrast, long-lived conventional T cells
remained at ? 15% of the total thymic pool at 6 months of age. Consistent with
these studies, we noticed that host-derived Treg cells represented a large
fraction (? 10%) of the total thymic Treg-cell pool in bone marrow chimeras,
suggesting that long-lived Treg cells also reside in the thymus of these mice.
The pool of long-lived Treg cells in the thymus was sustained by retention of
Treg cells in the thymus and by recirculation of peripheral Treg cells back into
the thymus. These long-lived thymic Treg cells suppressed T-cell proliferation to
an equivalent extent to splenic Treg cells. Together, these data demonstrate that
long-lived Treg cells accumulate in the thymus by both retention and
recirculation.