Mediator of ERBB2-driven Cell Motility (MEMO) Promotes Extranuclear Estrogen Receptor Signaling Involving the Growth Factor Receptors IGF1R and ERBB2

作者：Jiang, Kai; Yang, Zhihong; Cheng, Long; Wang, Shibin; Ning, Kang; Zhou, Lei; Lin, Jing; Zhong, Hui; Wang, Lisheng; Li, Yang; Huang, Junjian; Zhang, Hao^*; Ye, Qinong

来源：JOURNAL OF BIOLOGICAL CHEMISTRY, 2013, 288(34): 24590-24599.

DOI：10.1074/jbc.M113.467837

• BREAST-CANCER CELLS
• REGULATED GENE-EXPRESSION
• ACTIVATED PROTEIN-KINASE
• FACTOR-I RECEPTOR
• ER-ALPHA
• INTERACTING PROTEIN
• NUCLEAR ACTIONS
• MEMBRANE
• PHOSPHORYLATION
• PATHWAYS

In addition to nuclear estrogen receptor (ER) acting as a transcription factor, extranuclear ER also plays an important role in cancer cell growth regulation through activation of kinase cascades. However, the molecular mechanisms by which extranuclear ER exerts its function are still poorly understood. Here, we report that mediator of ERBB2-driven cell motility (MEMO) regulates extranuclear functions of ER. MEMO physically and functionally interacted with ER. Through its interaction with the growth factor receptors IGF1R and ERBB2, MEMO mediated extranuclear functions of ER, including activation of mitogen-activated protein kinase (MAPK) and protein kinase B/AKT, two important growth regulatory protein kinases, and integration of function with nuclear ER. Activation of MAPK and AKT was responsible for MEMO modulation of ER phosphorylation and estrogen-responsive gene expression. Moreover, MEMO increased anchorage-dependent and -independent growth of ER-positive breast cancer cells in vitro and was required for estrogen-induced breast tumor growth in nude mice. Together, our studies identified MEMO as a new component of extranuclear ER signalosome and suggest an essential role for MEMO in the regulation of ER-positive breast cancer cell growth.

• 出版日期2013-8-23
• 单位中国人民解放军总医院; 辽宁省疾病预防控制中心; 北京中医药大学