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2016 ; 35
(37
): 4927-36
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Long non-coding antisense RNA KRT7-AS is activated in gastric cancers and
supports cancer cell progression by increasing KRT7 expression
#MMPMID26876208
Huang B
; Song JH
; Cheng Y
; Abraham JM
; Ibrahim S
; Sun Z
; Ke X
; Meltzer SJ
Oncogene
2016[Sep]; 35
(37
): 4927-36
PMID26876208
show ga
Alterations in long non-coding RNAs (lncRNAs) are associated with human
carcinogenesis. One group of lncRNAs, which are antisense in orientation to
coding mRNAs (ASs), have been recently described in cancers but are poorly
understood. We sought to identify ASs involved in human gastric cancer (GC) and
to elucidate their mechanisms of action in carcinogenesis. We performed massively
parallel RNA sequencing in GCs and matched normal tissues, as well as in
GC-derived and normal gastric epithelial cell lines. One AS, designated Homo
sapiens keratin 7 (KRT7-AS), was selected due to its marked upregulation and
concordant expression with its cognate sense counterpart, KRT7, in GC tissues and
cell lines. KRT7-AS formed an RNA-RNA hybrid with KRT7 and controlled KRT7
expression at both the mRNA and the post-transcriptional levels. Moreover, forced
overexpression of the KRT7-overlapping region (OL) of KRT7-AS (but not its
non-KRT7-OL portions) increased keratin 7 protein levels in cells. Finally,
forced overexpression of full-length KRT7-AS or OL KRT7-AS (but not its
non-KRT7-OL regions) promoted GC cell proliferation and migration. We conclude
that lncRNA KRT7-AS promotes GC, at least in part, by increasing KRT7 expression.