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2016 ; 7
(40
): 66087-66099
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Circadian clock components ROR? and Bmal1 mediate the anti-proliferative effect
of MLN4924 in osteosarcoma cells
#MMPMID27602774
Zhang S
; Zhang J
; Deng Z
; Liu H
; Mao W
; Jiang F
; Xia Z
; Li JD
Oncotarget
2016[Oct]; 7
(40
): 66087-66099
PMID27602774
show ga
The anticancer small molecule MLN4924, a Nedd8-activating enzyme (NAE) inhibitor,
triggers cell-cycle arrest, apoptosis, and senescence in cancer cells. In this
study, we demonstrate that MLN4924 suppresses osteosarcoma cell proliferation by
inducing G2/M cell cycle arrest and apoptosis. Our results indicate that MLN4924
stabilizes the retinoid orphan nuclear receptor alpha (ROR?) by decreasing its
ubiquitination. RNA interference of ROR? attenuates the anti-proliferative effect
of MLN4924 in U2OS osteosarcoma cells. MLN4924 up-regulates the expression of p21
and Bmal1, two transcriptional targets of ROR?. However, p21 plays a minimal role
in the anti-proliferative effect of MLN4924 in U2OS osteosarcoma cells. In
contrast, Bmal1 suppression by siRNA attenuates the anti-proliferative effect of
MLN4924 in U2OS osteosarcoma cells, indicating that the MLN4924-mediated cell
growth inhibition is mediated by Bmal1. These results show MLN4924 to be a
promising therapeutic agent for the treatment of osteosarcoma and suggest that
MLN4924-induced tumor growth inhibition is mediated by the circadian clock
components ROR? and Bmal1.