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2014 ; 328
(1
): 99-117
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microRNA-21-induced dissociation of PDCD4 from rictor contributes to
Akt-IKK?-mTORC1 axis to regulate renal cancer cell invasion
#MMPMID25016284
Bera A
; Das F
; Ghosh-Choudhury N
; Kasinath BS
; Abboud HE
; Choudhury GG
Exp Cell Res
2014[Oct]; 328
(1
): 99-117
PMID25016284
show ga
Renal cancer metastasis may result from oncogenic forces that contribute to the
primary tumor. We have recently identified microRNA-21 as an oncogenic driver of
renal cancer cells. The mechanism by which miR-21 controls renal cancer cell
invasion is poorly understood. We show that miR-21 directly downregulates the
proapoptotic protein PDCD4 to increase migration and invasion of ACHN and 786-O
renal cancer cells as a result of phosphorylation/activation of Akt and IKK?,
which activate NF?B-dependent transcription. Constitutively active (CA) Akt or CA
IKK? blocks PDCD4-mediated inhibition and restores renal cancer cell migration
and invasion. PDCD4 inhibits mTORC1 activity, which was reversed by CA IKK?.
Moreover, CA mTORC1 restores cell migration and invasion inhibited by PDCD4 and
dominant negative IKK?. Moreover, PDCD4 negatively regulates mTORC2-dependent Akt
phosphorylation upstream of this cascade. We show that PDCD4 forms a complex with
rictor, an exclusive component of mTORC2, and that this complex formation is
reduced in renal cancer cells due to increased miR-21 expression resulting in
enhanced phosphorylation of Akt. Thus our results identify a previously
unrecognized signaling node where high miR-21 levels reduce rictor-PDCD4
interaction to increase phosphorylation of Akt and contribute to metastatic
fitness of renal cancer cells.