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GPER-induced signaling is essential for the survival of breast cancer stem cells.


ABSTRACT: G protein-coupled estrogen receptor-1 (GPER), a member of the G protein-coupled receptor (GPCR) superfamily, mediates estrogen-induced proliferation of normal and malignant breast epithelial cells. However, its role in breast cancer stem cells (BCSCs) remains unclear. Here we showed greater expression of GPER in BCSCs than non-BCSCs of three patient-derived xenografts of ER- /PR+ breast cancers. GPER silencing reduced stemness features of BCSCs as reflected by reduced mammosphere forming capacity in vitro, and tumor growth in vivo with decreased BCSC populations. Comparative phosphoproteomics revealed greater GPER-mediated PKA/BAD signaling in BCSCs. Activation of GPER by its ligands, including tamoxifen (TMX), induced phosphorylation of PKA and BAD-Ser118 to sustain BCSC characteristics. Transfection with a dominant-negative mutant BAD (Ser118Ala) led to reduced cell survival. Taken together, GPER and its downstream signaling play a key role in maintaining the stemness of BCSCs, suggesting that GPER is a potential therapeutic target for eradicating BCSCs.

SUBMITTER: Chan YT 

PROVIDER: S-EPMC7003894 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature

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GPER-induced signaling is essential for the survival of breast cancer stem cells.

Chan Yu-Tzu YT   Lai Alan C-Y AC   Lin Ruey-Jen RJ   Wang Ya-Hui YH   Wang Yi-Ting YT   Chang Wen-Wei WW   Wu Hsin-Yi HY   Lin Yu-Ju YJ   Chang Wen-Ying WY   Wu Jen-Chine JC   Yu Jyh-Cherng JC   Chen Yu-Ju YJ   Yu Alice L AL  

International journal of cancer 20190807 6


G protein-coupled estrogen receptor-1 (GPER), a member of the G protein-coupled receptor (GPCR) superfamily, mediates estrogen-induced proliferation of normal and malignant breast epithelial cells. However, its role in breast cancer stem cells (BCSCs) remains unclear. Here we showed greater expression of GPER in BCSCs than non-BCSCs of three patient-derived xenografts of ER<sup>-</sup> /PR<sup>+</sup> breast cancers. GPER silencing reduced stemness features of BCSCs as reflected by reduced mammo  ...[more]

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