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2018 ; 109
(7
): 2211-2220
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Long noncoding RNA NORAD regulates transforming growth factor-? signaling and
epithelial-to-mesenchymal transition-like phenotype
#MMPMID29722104
Kawasaki N
; Miwa T
; Hokari S
; Sakurai T
; Ohmori K
; Miyauchi K
; Miyazono K
; Koinuma D
Cancer Sci
2018[Jul]; 109
(7
): 2211-2220
PMID29722104
show ga
Long noncoding RNAs are involved in a variety of cellular functions. In
particular, an increasing number of studies have revealed the functions of long
noncoding RNA in various cancers; however, their precise roles and mechanisms of
action remain to be elucidated. NORAD, a cytoplasmic long noncoding RNA, is
upregulated by irradiation and functions as a potential oncogenic factor by
binding and inhibiting Pumilio proteins (PUM1/PUM2). Here, we show that NORAD
upregulates transforming growth factor-? (TGF-?) signaling and regulates
TGF-?-induced epithelial-to-mesenchymal transition (EMT)-like phenotype, which is
a critical step in the progression of lung adenocarcinoma, A549 cells. However,
PUM1 does not appear to be involved in this process. We thus focused on importin
?1 as a binding partner of NORAD and found that knockdown of NORAD partially
inhibits the physical interaction of importin ?1 with Smad3, inhibiting the
nuclear accumulation of Smad complexes in response to TGF-?. Our findings may
provide a new mechanism underlying the function of NORAD in cancer cells.