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2016 ; 113
(51
): E8286-E8295
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miR-17?92 family clusters control iNKT cell ontogenesis via modulation of TGF-?
signaling
#MMPMID27930306
Fedeli M
; Riba M
; Garcia Manteiga JM
; Tian L
; Vigaṇ V
; Rossetti G
; Pagani M
; Xiao C
; Liston A
; Stupka E
; Cittaro D
; Abrignani S
; Provero P
; Dellabona P
; Casorati G
Proc Natl Acad Sci U S A
2016[Dec]; 113
(51
): E8286-E8295
PMID27930306
show ga
Invariant natural killer T cells (iNKT) cells are T lymphocytes displaying innate
effector functions, acquired through a distinct thymic developmental program
regulated by microRNAs (miRNAs). Deleting miRNAs by Dicer ablation (Dicer KO) in
thymocytes selectively impairs iNKT cell survival and functional differentiation.
To unravel this miRNA-dependent program, we systemically identified transcripts
that were differentially expressed between WT and Dicer KO iNKT cells at
different differentiation stages and predicted to be targeted by the iNKT
cell-specific miRNAs. TGF-? receptor II (TGF-?RII), critically implicated in iNKT
cell differentiation, was found up-regulated in iNKT Dicer KO cells together with
enhanced TGF-? signaling. miRNA members of the miR-17?92 family clusters were
predicted to target Tgfbr2 mRNA upon iNKT cell development. iNKT cells lacking
all three miR-17?92 family clusters (miR-17?92, miR-106a?363, miR-106b?25)
phenocopied both increased TGF-?RII expression and signaling, and defective
effector differentiation, displayed by iNKT Dicer KO cells. Consistently, genetic
ablation of TGF-? signaling in the absence of miRNAs rescued iNKT cell
differentiation. These results elucidate the global impact of miRNAs on the iNKT
cell developmental program and uncover the targeting of a lineage-specific
cytokine signaling by miRNAs as a mechanism regulating innate-like T-cell
development and effector differentiation.