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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Immunol
2017 ; 199
(2
): 589-597
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gab.com Text
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TCR Signal Strength Regulates Akt Substrate Specificity To Induce Alternate
Murine Th and T Regulatory Cell Differentiation Programs
#MMPMID28600288
Hawse WF
; Boggess WC
; Morel PA
J Immunol
2017[Jul]; 199
(2
): 589-597
PMID28600288
show ga
The Akt/mTOR pathway is a key driver of murine CD4(+) T cell differentiation, and
induction of regulatory T (Treg) cells results from low TCR signal strength and
low Akt/mTOR signaling. However, strong TCR signals induce high Akt activity that
promotes Th cell induction. Yet, it is unclear how Akt controls alternate T cell
fate decisions. We find that the strength of the TCR signal results in
differential Akt enzymatic activity. Surprisingly, the Akt substrate networks
associated with T cell fate decisions are qualitatively different. Proteomic
profiling of Akt signaling networks during Treg versus Th induction demonstrates
that Akt differentially regulates RNA processing and splicing factors to drive T
cell differentiation. Interestingly, heterogeneous nuclear ribonucleoprotein
(hnRNP) L or hnRNP A1 are Akt substrates during Treg induction and have known
roles in regulating the stability and splicing of key mRNAs that code for
proteins in the canonical TCR signaling pathway, including CD3? and CD45.
Functionally, inhibition of Akt enzymatic activity results in the dysregulation
of splicing during T cell differentiation, and knockdown of hnRNP L or hnRNP A1
results in the lower induction of Treg cells. Together, this work suggests that a
switch in substrate specificity coupled to the phosphorylation status of Akt may
lead to alternative cell fates and demonstrates that proteins involved with
alternative splicing are important factors in T cell fate decisions.