The lncRNA BORG Drives Breast Cancer Metastasis and Disease Recurrence

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• Long noncoding RNAs (lncRNAs) are key regulators in cancer development and metastasis.
• Understanding novel lncRNAs involved in breast cancer progression is crucial for therapeutic strategies.

Purpose of the Study:

• To identify and characterize a novel lncRNA, BMP/OP-Responsive Gene (BORG), involved in aggressive breast cancer phenotypes.
• To elucidate the mechanism by which BORG contributes to breast cancer metastasis and recurrence.

Main Methods:

• In silico and biological analyses were performed to identify and validate BORG.
• Expression correlation with clinical breast cancer cohorts was assessed.
• Mechanistic studies investigated BORG's role in promoting TRIM28 activity and its impact on cancer cell proliferation, survival, and metastasis.

Main Results:

• BORG expression correlates with aggressive breast cancer, metastatic competence, and disease recurrence in clinical data.
• BORG promotes the metastatic outgrowth of latent breast cancer cells by enhancing TRIM28's repressive activity.
• Inhibition of BORG in metastatic cells reduced lung colonization in a mouse model.

Conclusions:

• BORG is a novel lncRNA that drives aggressive breast cancer phenotypes and metastasis.
• BORG functions by modulating TRIM28-mediated transcriptional repression, impacting cancer cell proliferation and survival.
• Targeting BORG may offer a therapeutic strategy to impede breast cancer metastasis and recurrence.