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2017 ; 8
(33
): 54858-54872
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Hyperactivated mTORC1 downregulation of FOXO3a/PDGFR?/AKT cascade restrains
tuberous sclerosis complex-associated tumor development
#MMPMID28903387
Wang L
; Ni Z
; Liu Y
; Ji S
; Jin F
; Jiang K
; Ma J
; Ren C
; Zhang H
; Hu Z
; Zha X
Oncotarget
2017[Aug]; 8
(33
): 54858-54872
PMID28903387
show ga
Hyperactivation of mammalian target of rapamycin complex 1 (mTORC1), caused by
loss-of-function mutations in either the TSC1 or TSC2 gene, leads to the
development of tuberous sclerosis complex (TSC), a benign tumor syndrome with
multiple affected organs. mTORC1-mediated inhibition of AKT constrains the tumor
progression of TSC, but the exact mechanisms remain unclear. Herein we showed
that loss of TSC1 or TSC2 downregulation of platelet-derived growth factor
receptor ? (PDGFR?) expression was mediated by mTORC1. Moreover, mTORC1 inhibited
PDGFR? expression via suppression of forkhead box O3a (FOXO3a)-mediated PDGFR?
gene transcription. In addition, ectopic expression of PDGFR? promoted AKT
activation and enhanced proliferation and tumorigenic capacity of Tsc1- or
Tsc2-null mouse embryonic fibroblasts (MEFs), and vice versa. Most importantly,
rapamycin in combination with AG1295, a PDGFR inhibitor, significantly inhibited
growth of TSC1/TSC2 complex-deficient cells in vitro and in vivo. Therefore,
downregulated FOXO3a/PDGFR?/AKT pathway exerts a protective effect against
hyperactivated mTORC1-induced tumorigenesis caused by loss of TSC1/TSC2 complex,
and the combination of rapamycin and AG1295 may be a new effective strategy for
TSC-associated tumors treatment.