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2016 ; 7
(24
): 36489-36500
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English Wikipedia
ISL1, a novel regulator of CCNB1, CCNB2 and c-MYC genes, promotes gastric cancer
cell proliferation and tumor growth
#MMPMID27183908
Shi Q
; Wang W
; Jia Z
; Chen P
; Ma K
; Zhou C
Oncotarget
2016[Jun]; 7
(24
): 36489-36500
PMID27183908
show ga
Islet-1 (ISL1) belongs to the LIM homeodomain transcription factor family, which
is specifically expressed in certain tissue types only. Previously, we reported
that ISL1 is aberrantly overexpressed in gastric cancer (GC). However, its role
in GC is not clear. Here, we report that ISL1 is aberrantly upregulated not only
in human gastric carcinoma tissues but also in some GC cell lines. Upregulated
ISL1 expression enhanced xenografted gastric carcinoma development, while ISL1
knockdown inhibited GC growth in nude mice. ISL1 overexpression promoted GC cell
proliferation, colony formation, and cell growth in soft agar, and facilitated
cell cycle transition in GC cells, demonstrated an increase in the proportion of
cells in the G2/M and S phases and a decrease in the proportion of cells in the
G1 phase. Furthermore, we provide evidence that ISL1 is a novel regulator of the
cyclin B1 (CCNB1), cyclin B2 (CCNB2) and c-myc (c-MYC) genes. ISL1 activated the
expression of these genes in GC cells by binding to the conserved binding sites
on their promoters or enhancers. The expression levels of the genes were
decreased in response to ISL1 knockdown. Therefore, ISL1 may serve as a potential
therapeutic target in GC.