miR-338-3p Is Regulated by Estrogens through GPER in Breast Cancer Cells and Cancer-Associated Fibroblasts (CAFs)

Estrogens acting through the classic estrogen receptors (ERs) and the G protein estrogen receptor (GPER) regulate the expression of diverse miRNAs, small sequences of non-coding RNA involved in several pathophysiological conditions, including breast cancer. In order to provide novel insights on miRN...

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Published in:Cells (Basel, Switzerland) Switzerland), 2018-11, Vol.7 (11), p.203
Main Authors: Vivacqua, Adele, Sebastiani, Anna, Miglietta, Anna Maria, Rigiracciolo, Damiano Cosimo, Cirillo, Francesca, Galli, Giulia Raffaella, Talia, Marianna, Santolla, Maria Francesca, Lappano, Rosamaria, Giordano, Francesca, Panno, Maria Luisa, Maggiolini, Marcello
Format: Article
Language:English
Subjects:
17β-Estradiol
Breast cancer
c-Fos
CAFs
Cyclin D1
Estrogen receptors
Estrogens
Fibroblasts
Genes
GPER
Kinases
MicroRNAs
miR-338-3p
Molecular modelling
Non-coding RNA
Proteins
Real time
Software
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Summary:Estrogens acting through the classic estrogen receptors (ERs) and the G protein estrogen receptor (GPER) regulate the expression of diverse miRNAs, small sequences of non-coding RNA involved in several pathophysiological conditions, including breast cancer. In order to provide novel insights on miRNAs regulation by estrogens in breast tumor, we evaluated the expression of 754 miRNAs by TaqMan Array in ER-negative and GPER-positive SkBr3 breast cancer cells and cancer-associated fibroblasts (CAFs) upon 17β-estradiol (E2) treatment. Various miRNAs were regulated by E2 in a peculiar manner in SkBr3 cancer cells and CAFs, while miR-338-3p displayed a similar regulation in both cell types. By METABRIC database analysis we ascertained that miR-338-3p positively correlates with overall survival in breast cancer patients, according to previous studies showing that miR-338-3p may suppress the growth and invasion of different cancer cells. Well-fitting with these data, a miR-338-3p mimic sequence decreased and a miR-338-3p inhibitor sequence rescued the expression of genes and the proliferative effects induced by E2 through GPER in SkBr3 cancer cells and CAFs. Altogether, our results provide novel evidence on the molecular mechanisms by which E2 may regulate miR-338-3p toward breast cancer progression.
ISSN:2073-4409
2073-4409
DOI:10.3390/cells7110203