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2017 ; 10
(ä): 4379-4391
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Downregulation of DEPTOR inhibits the proliferation, migration, and survival of
osteosarcoma through PI3K/Akt/mTOR pathway
#MMPMID28932123
Hu B
; Lv X
; Gao F
; Chen S
; Wang S
; Qing X
; Liu J
; Wang B
; Shao Z
Onco Targets Ther
2017[]; 10
(ä): 4379-4391
PMID28932123
show ga
Accumulating evidence reveals that DEP-domain containing mTOR-interacting protein
(DEPTOR) plays pivotal roles in the pathogenesis and progression of many tumors.
However, the expression level of DEPTOR and its function in the tumorigenesis of
osteosarcoma (OS) remain unknown. In this study, we conducted quantitative
real-time polymerase chain reaction, Western blot, and immunohistochemistry to
detect DEPTOR expression level in human OS tissues and cell lines. To assess
DEPTOR function, DEPTOR siRNA was designed and transfected into OS cells, which
were then used in a series of in vitro assays. Our results indicated that DEPTOR
was highly expressed in some OS tissues and cell lines. DEPTOR knockdown by siRNA
dramatically inhibited cell proliferation, migration, invasion, and the formation
of vasculogenic mimicry in OS cells. In addition, DEPTOR knockdown induced cell
cycle arrest in the G0/G1 phase and apoptosis in the OS cell lines, MG63 and
MNNG/HOS. Furthermore, we found that DEPTOR knockdown notably activated mTOR and
inhibited the PI3K/Akt pathway. Taken together, these results suggest that DEPTOR
overexpression is necessary for the proliferation, migration, invasion, formation
of vasculogenic mimicry, and survival of OS cells and may be a potential target
for the treatment of OS.