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Detecting the Ligand-binding Domain Dimerization Activity of Estrogen Receptor Alpha Using the Mammalian Two-Hybrid Assay

Detecting the Ligand-binding Domain Dimerization Activity of Estrogen Receptor Alpha Using the Mammalian Two-Hybrid Assay

Published on: December 19, 2018

Memo interacts with c-Src to control Estrogen Receptor alpha sub-cellular localization

Anna Frei^1,2, Gwen MacDonald¹, Ingrid Lund³

¹Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse, Basel, Switzerland.

|July 30, 2016

Abstract:

Understanding the complex interaction between growth factor and steroid hormone signaling pathways in breast cancer is key to identifying suitable therapeutic strategies to avoid progression and therapy resistance. The interaction between these two pathways is of paramount importance for the development of endocrine resistance. Nevertheless, the molecular mechanisms behind their crosstalk are still largely obscure. We previously reported that Memo is a small redox-active protein that controls heregulin-mediated migration of breast cancer cells. Here we report that Memo sits at the intersection between heregulin and estrogen signaling, and that Memo controls Estrogen Receptor alpha (ERα) sub-cellular localization, phosphorylation, and function downstream of heregulin and estrogen in breast cancer cells. Memo facilitates ERα and c-Src interaction, ERα Y537 phosphorylation, and has the ability to control ERα extra-nuclear localization. Thus, we identify Memo as an important key mediator between the heregulin and estrogen signaling pathways, which affects both breast cancer cell migration and proliferation.

Insights

Memo protein links heregulin and estrogen signaling in breast cancer, impacting cell migration and proliferation. This discovery offers new therapeutic targets for endocrine resistance.

Area of Science:

Oncology
Molecular Biology
Cell Signaling

Background:

Growth factor and steroid hormone signaling are crucial in breast cancer progression and therapy resistance.
The crosstalk between these pathways, particularly concerning endocrine resistance, is not fully understood.
Memo protein was previously identified as a regulator of heregulin-mediated breast cancer cell migration.

Purpose of the Study:

To investigate the role of Memo protein at the intersection of heregulin and estrogen signaling pathways in breast cancer.
To elucidate the molecular mechanisms by which Memo influences Estrogen Receptor alpha (ERα) function.
To determine Memo's impact on breast cancer cell migration and proliferation.

Main Methods:

Investigated Memo's interaction with heregulin and estrogen signaling pathways.
Assessed Memo's effect on Estrogen Receptor alpha (ERα) sub-cellular localization and phosphorylation.
Examined Memo's role in facilitating ERα and c-Src interaction and ERα Y537 phosphorylation.
Evaluated Memo's control over ERα extra-nuclear localization.

Main Results:

Memo protein acts as a key mediator between heregulin and estrogen signaling pathways in breast cancer cells.
Memo controls Estrogen Receptor alpha (ERα) sub-cellular localization, phosphorylation, and function downstream of heregulin and estrogen.
Memo facilitates the interaction between ERα and c-Src, promoting ERα Y537 phosphorylation.
Memo influences ERα's extra-nuclear localization, affecting breast cancer cell migration and proliferation.

Conclusions:

Memo is identified as a critical mediator linking heregulin and estrogen signaling in breast cancer.
Memo's regulation of ERα function is a key mechanism contributing to breast cancer cell migration and proliferation.
Targeting Memo may offer novel therapeutic strategies to overcome endocrine resistance in breast cancer.

Read full analysis

Keywords:

ER alpha Memo1 c-Src estrogen heregulin

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