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2016 ; 7
(16
): 21064-75
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PI3K/Akt promotes feedforward mTORC2 activation through IKK?
#MMPMID27027448
Dan HC
; Antonia RJ
; Baldwin AS
Oncotarget
2016[Apr]; 7
(16
): 21064-75
PMID27027448
show ga
The ser-thr Akt plays a critical role in the regulation of cell survival, cell
growth and proliferation, as well as energy metabolism and is dysregulated in
many cancers. The regulation of Akt activity depends on the phosphorylation at
two sites: (i) Thr308 in the activation loop by phosphoinositide-dependent
kinase-1 (PDK1) and (ii) Ser473 hydrophobic motif at the carboxyl terminus by a
second activity termed PDK2, which is the mTORC2 complex composed of mTOR,
rictor, and Sin1. Previously we demonstrated that IKK?, a component of the IKK
complex that controls NF-?B activation, participates in the Akt-dependent
regulation of mTORC1. Here we have explored a potential involvement of IKK? in
controlling Akt activity and whether this may involve mTORC2. The experiments
show that IKK? associates with mTORC2 in several cancer cells in a manner
dependent on PI3K/Akt activity and that IKK? positively promotes Akt
phosphorylation at Ser473 and at Thr308. Moreover, IKK? enhances mTORC2 kinase
activity directed to Akt on Ser473 and Akt-mediated phosphorylation of FOXO3a and
GSK3?, but not other Akt-associated targets such as TSC2 and PRAS40, indicating
the existence of multiple mechanisms of Akt activation in cells. In addition,
loss of IKK? suppresses growth factor-induced Akt activation associated with
mTORC1 inhibition. These results indicate that IKK? serves as a feedforward
regulator of mTORC2 and that IKK? could serve as a key therapeutic target to
block mTORC2 and Akt activation in some cancers.
|*Gene Expression Regulation, Neoplastic
[MESH]
|Apoptosis
[MESH]
|Biomarkers, Tumor/*metabolism
[MESH]
|Cell Proliferation
[MESH]
|Humans
[MESH]
|I-kappa B Kinase/*metabolism
[MESH]
|Mechanistic Target of Rapamycin Complex 2/*metabolism
[MESH]