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2015 ; 6
(18
): 16573-87
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Estrogenic gper signaling regulates mir144 expression in cancer cells and
cancer-associated fibroblasts (cafs)
#MMPMID26030000
Vivacqua A
; De Marco P
; Santolla MF
; Cirillo F
; Pellegrino M
; Panno ML
; Abonante S
; Maggiolini M
Oncotarget
2015[Jun]; 6
(18
): 16573-87
PMID26030000
show ga
MicroRNAs (miRNAs) are small non coding RNA molecules that play a crucial role in
several pathophysiological conditions, including cancer. The stimulation of
hormone-sensitive tumors by estrogens are mediated by estrogen receptor (ER)? and
G protein estrogen receptor (GPER). Previous studies have reported that ER?
regulates miRNA expression, while this ability of GPER remains to be elucidated.
Here, we demonstrate that in SkBr3 breast cancer and HepG2 hepatocarcinoma cells,
17?-estradiol (E2) and the selective GPER ligand G-1 induce miR144 expression
through GPER and the involvement of the PI3K/ERK1/2/Elk1 transduction pathway.
Moreover, we show that E2 and G-1 down-regulate through miR144 the
onco-suppressor Runx1 and increase cell cycle progression. The capability of E2
and G-1 in triggering the induction of miR144 and the down-regulation of Runx1
was also confirmed in cancer-associated fibroblasts (CAFs) that are main
components of the tumor microenvironment driving cancer progression. Further
confirming these results, Runx1 protein levels were found decreased in tumor
xenografts upon G-1 treatment. On the basis of our findings miR144 and Runx1 may
be included among the oncotargets of GPER action. Moreover, the present data
provide new insights regarding the ability of estrogens to trigger the
GPER/miR144/Runx1 transduction pathway toward the stimulation of cancer
progression.