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2014 ; 193
(9
): 4297-4301
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Cutting edge: Discrete functions of mTOR signaling in invariant NKT cell
development and NKT17 fate decision
#MMPMID25261481
Wei J
; Yang K
; Chi H
J Immunol
2014[Nov]; 193
(9
): 4297-4301
PMID25261481
show ga
Invariant NKT (iNKT) cells recently were classified into NKT1, NKT2, and NKT17
lineages with distinct transcription factor and cytokine profiles, but the
mechanisms underlying such fate decisions remain elusive. In this article, we
report crucial roles for mechanistic target of rapamycin (mTOR) signaling,
especially mTORC2, in iNKT cell development and fate determination of NKT17
cells. Loss of Rictor, an obligatory component of mTORC2, decreased thymic and
peripheral iNKT cells, which was associated with defective survival. Strikingly,
Rictor deficiency selectively abolished the NKT17 lineage, as indicated by a
marked reduction in ROR?t and IL-17 expression. Moreover, deletion of phosphatase
and tensin homolog (Pten) upregulated mTORC2 activity and enhanced NKT17
generation, but concomitant loss of Rictor reversed the NKT17 dysregulation. In
contrast, mTORC1 regulators Raptor and Rheb are dispensable for NKT17
differentiation, despite their importance in iNKT cell thymic development. Our
findings establish pivotal and unique roles for mTORC2 signaling, which is
reciprocally regulated by Rictor and Pten, in NKT17 lineage determination.