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2017 ; 18
(11
): 1957-1967
Nephropedia Template TP
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English Wikipedia
IL-23 drives differentiation of peripheral ??17 T cells from adult bone
marrow-derived precursors
#MMPMID28855306
Papotto PH
; Gonçalves-Sousa N
; Schmolka N
; Iseppon A
; Mensurado S
; Stockinger B
; Ribot JC
; Silva-Santos B
EMBO Rep
2017[Nov]; 18
(11
): 1957-1967
PMID28855306
show ga
Pro-inflammatory interleukin (IL)-17-producing ?? (??17) T cells are thought to
develop exclusively in the thymus during fetal/perinatal life, as adult bone
marrow precursors fail to generate ??17 T cells under homeostatic conditions.
Here, we employ a model of experimental autoimmune encephalomyelitis (EAE) in
which hematopoiesis is reset by bone marrow transplantation and demonstrate
unequivocally that V?4(+) ??17 T cells can develop de novo in draining lymph
nodes in response to innate stimuli. In vitro, ?? T cells from IL-17 fate-mapping
reporter mice that had never activated the Il17 locus acquire IL-17 expression
upon stimulation with IL-1? and IL-23. Furthermore, IL-23R (but not IL-1R1)
deficiency severely compromises the induction of ??17 T cells in EAE,
demonstrating the key role of IL-23 in the process. Finally, we show, in a
composite model involving transfers of both adult bone marrow and neonatal
thymocytes, that induced ??17 T cells make up a substantial fraction of the total
IL-17-producing V?4(+) T-cell pool upon inflammation, which attests the relevance
of this novel pathway of peripheral ??17 T-cell differentiation.