TY - JOUR
T1 - G-protein-coupled estrogen receptor 1 promotes gender disparities in hepatocellular carcinoma via modulation of SIN1 and mTOR complex 2 activity
AU - Feng, Guanying
AU - Cai, Jingshu
AU - Huang, Yunchuanxiang
AU - Zhu, Xianjun
AU - Gong, Bo
AU - Yang, Zhenglin
AU - Yan, Chunhong
AU - Hu, Zhuowei
AU - Yang, Lu
AU - Wang, Ziyan
N1 - Publisher Copyright:
© 2020 American Association for Cancer Research.
PY - 2020/12/1
Y1 - 2020/12/1
N2 - Due to its intricate heterogeneity and limited treatment, hepatocellular carcinoma (HCC) has been considered a major cause of cancer-related mortality worldwide. Increasing evidence indicates that G-protein-coupled estrogen receptor 1 (GPER1) can promote estrogen-dependent hepatocellular proliferation by activating AKT signaling. The mTOR complex 2 (mTORC2), whose integrity and activity are modulated by its subunit Sin1, controls the activation of AKT by phosphorylation at position S473. In this study, we investigate the modulation of Sin1 and how estrogen signaling may influence the mTORC2–AKT cascade in HCC cells and a DEN-induced mouse model. We have found that estradiol-dependent Sin1 expression is transcriptionally modulated by GPER1 as well as ERa. GPER1 is able to regulate Sin1 stability via nuclear translocation, therefore increasing Sin1–mTORC2–AKT activation. Moreover, Sin1 interacts with ERa and further enhances its transcriptional activity. Sin1 is highly expressed in acute liver injury and in cases of HCC harboring high expression of GPER1 and constitutive activation of mTORC2–AKT signaling. GPER1 inhibition using the antagonist G-15 reverses DEN-induced acute liver injury by suppressing Sin1 expression and mTORC2–AKT activation. Notably, SIN1 expression varies between male and female mice in the context of both liver injury and liver cancer. In addition, high SIN1 expression is predictive of good prognosis in both male and female patients with HCC who are free from hepatitis virus infection and who report low alcohol consumption. Hence, here we demonstrate that Sin1 can be regulated by GPER1 both through nongenomic and indirect genomic signaling. Implications: This study suggests that Sin1 may be a novel HCC biomarker which is gender-dependent and sensitive to particular risk factor.
AB - Due to its intricate heterogeneity and limited treatment, hepatocellular carcinoma (HCC) has been considered a major cause of cancer-related mortality worldwide. Increasing evidence indicates that G-protein-coupled estrogen receptor 1 (GPER1) can promote estrogen-dependent hepatocellular proliferation by activating AKT signaling. The mTOR complex 2 (mTORC2), whose integrity and activity are modulated by its subunit Sin1, controls the activation of AKT by phosphorylation at position S473. In this study, we investigate the modulation of Sin1 and how estrogen signaling may influence the mTORC2–AKT cascade in HCC cells and a DEN-induced mouse model. We have found that estradiol-dependent Sin1 expression is transcriptionally modulated by GPER1 as well as ERa. GPER1 is able to regulate Sin1 stability via nuclear translocation, therefore increasing Sin1–mTORC2–AKT activation. Moreover, Sin1 interacts with ERa and further enhances its transcriptional activity. Sin1 is highly expressed in acute liver injury and in cases of HCC harboring high expression of GPER1 and constitutive activation of mTORC2–AKT signaling. GPER1 inhibition using the antagonist G-15 reverses DEN-induced acute liver injury by suppressing Sin1 expression and mTORC2–AKT activation. Notably, SIN1 expression varies between male and female mice in the context of both liver injury and liver cancer. In addition, high SIN1 expression is predictive of good prognosis in both male and female patients with HCC who are free from hepatitis virus infection and who report low alcohol consumption. Hence, here we demonstrate that Sin1 can be regulated by GPER1 both through nongenomic and indirect genomic signaling. Implications: This study suggests that Sin1 may be a novel HCC biomarker which is gender-dependent and sensitive to particular risk factor.
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U2 - 10.1158/1541-7786.MCR-20-0173
DO - 10.1158/1541-7786.MCR-20-0173
M3 - Article
C2 - 32873626
AN - SCOPUS:85100381604
SN - 1541-7786
VL - 18
SP - 1863
EP - 1875
JO - Molecular Cancer Research
JF - Molecular Cancer Research
IS - 12
ER -