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2016 ; 7
(52
): 86857-86870
Nephropedia Template TP
gab.com Text
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Twit Text #
English Wikipedia
Epigenetic inhibition of miR-663b by long non-coding RNA HOTAIR promotes
pancreatic cancer cell proliferation via up-regulation of insulin-like growth
factor 2
#MMPMID27895308
Cai H
; An Y
; Chen X
; Sun D
; Chen T
; Peng Y
; Zhu F
; Jiang Y
; He X
Oncotarget
2016[Dec]; 7
(52
): 86857-86870
PMID27895308
show ga
Pancreatic cancer is one of the most deadly cancers with a poor prognosis.
Although microRNAs are involving in the carcinogenesis and development of
pancreatic cancer, little information is known regarding the role of miR-663b in
pancreatic cancer. In this study, the expression of miR-663b in pancreatic cancer
cells was down-regulated by hypermethylation in its putative promoter region, and
overexpression of miR-663b repressed cell proliferation, invasion and migration,
and induced apoptosis in pancreatic cancer cells. Bioinformatics analysis,
luciferase report assay and rescue experiments showed that insulin-like growth
factor 2 (IGF2) was a direct target of miR-663b. Results from clinical samples
showed that the expression level of miR-663b correlated with the pathological
grading, and the expression of miR-663b was down-regulated and was inversely
correlated with IGF2 expression level in pancreatic cancer tissues. More
importantly, the long non-coding RNA, HOX transcript antisense RNA (HOTAIR), was
up-regulated in both pancreatic cancer cells and tissues, and HOTAIR suppressed
the expression of miR-663b in pancreatic cancer by histone modification on
H3K4me3 and H3K27me3 on miR-663b promoter. Further in vivo studies demonstrated
that the stable overexpression of miR-663b or knock-down of HOTAIR inhibited
tumor growth and was associated with IGF2 expression. In summary, our studies
demonstrated that miR-663b is epigenetically repressed by HOTAIR and exerts its
tumor-suppressive function via targeting IGF2 in pancreatic cancer.