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2017 ; 292
(11
): 4743-4752
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Central Regulatory Role for SIN1 in Interferon ? (IFN?) Signaling and Generation
of Biological Responses
#MMPMID28174303
Kroczynska B
; Blyth GT
; Rafidi RL
; Majchrzak-Kita B
; Xu L
; Saleiro D
; Kosciuczuk EM
; Jemielity J
; Su B
; Altman JK
; Eklund EA
; Fish EN
; Platanias LC
J Biol Chem
2017[Mar]; 292
(11
): 4743-4752
PMID28174303
show ga
The precise signaling mechanisms by which type II IFN receptors control
expression of unique genes to induce biological responses remain to be
established. We provide evidence that Sin1, a known element of the mammalian
target of rapamycin complex 2 (mTORC2), is required for IFN?-induced
phosphorylation and activation of AKT and that such activation mediates
downstream regulation of mTORC1 and its effectors. These events play important
roles in the assembly of the eukaryotic translation initiation factor 4F (eIF4F)
and mRNA translation of IFN-stimulated genes. Interestingly, IFN?-induced
tyrosine phosphorylation of STAT1 is reduced in cells with targeted disruption of
Sin1, leading to decreased transcription of several IFN?-inducible genes in an
mTORC2-independent manner. Additionally, our studies establish that Sin1 is
essential for generation of type II IFN-dependent antiviral effects and
antiproliferative responses in normal and malignant hematopoiesis. Together, our
findings establish an important role for Sin1 in both transcription and
translation of IFN-stimulated genes and type II IFN-mediated biological
responses, involving both mTORC2-dependent and -independent functions.
|Adaptor Proteins, Signal Transducing/*immunology
[MESH]