Crosstalk between Notch, HIF-1α and GPER in Breast Cancer EMT

Area of Science:

• Oncology
• Molecular Biology
• Cell Biology

Background:

• The Notch signaling pathway is crucial in development and cancer, regulating processes like angiogenesis and epithelial-mesenchymal-transition (EMT).
• EMT involves epithelial cells losing differentiation and gaining motility, contributing to cancer progression, often influenced by genetic instability or the tumor microenvironment.

Purpose of the Study:

• To explore the functional interactions between Notch signaling, hypoxia, and estrogen in breast cancer cells, focusing on EMT.
• To investigate the role of hypoxia signaling and the interaction between HIF-1α and GPER in breast cancer cells and cancer-associated fibroblasts (CAFs).

Main Methods:

• Review of studies on Notch signaling pathways and their regulatory nodes.
• Analysis of research on the interplay between Notch signaling, hypoxia, and estrogen in breast cancer.
• Examination of evidence for functional interactions between HIF-1α, GPER, and Notch signaling.

Main Results:

• Notch signaling, hypoxia, and estrogen are implicated in driving EMT in breast cancer.
• A functional interaction exists between hypoxia-inducible factor 1-alpha (HIF-1α) and G protein-coupled estrogen receptor (GPER) in breast cancer cells and CAFs.
• A proposed functional network involving HIF-1α, GPER, and Notch signaling integrates tumor microenvironmental cues to induce EMT.

Conclusions:

• The convergence of hypoxia and estrogen signaling on Notch-mediated EMT highlights a complex regulatory network.
• Further research is needed to elucidate the precise mechanisms of hypoxia and estrogen signaling in Notch-mediated EMT within the tumor microenvironment.
• The findings suggest potential benefits for pharmacological strategies targeting this network to inhibit breast cancer progression.