Fam3C alters Golgi apparatus morphology and function in triple negative breast cancer

Area of Science:

• Molecular Biology
• Cancer Research
• Cell Biology

Background:

• Fam3C (Interleukin-like EMT inducer) is a known regulator of epithelial-mesenchymal transition (EMT) and breast cancer stem cell phenotypes.
• Previous studies indicate Fam3C's role in tumor progression and metastasis across various cancer models.

Purpose of the Study:

• To investigate the specific impact of Fam3C on triple-negative breast cancer (TNBC) patients and mouse models.
• To elucidate the subcellular localization and functional mechanisms of Fam3C within cancer cells.

Main Methods:

• Utilized patient data and genetically engineered mouse models for TNBC progression studies.
• Investigated Fam3C's subcellular localization using cell models, focusing on its interaction with the Golgi apparatus.
• Analyzed the effects of Golgi-retained Fam3C on cellular morphology, protein secretion, and invasive potential.

Main Results:

• Fam3C, contrary to its known secreted nature, is retained within the Golgi apparatus due to signal peptide membrane anchoring.
• Golgi retention of Fam3C alters organelle morphology and function, impacting protein secretion pathways.
• These alterations correlate with increased invasive potential in cancer cells.

Conclusions:

• Fam3C's intracellular localization in the Golgi is a novel mechanism influencing TNBC progression.
• Targeting Fam3C's Golgi-associated functions presents a potential therapeutic strategy for invasive TNBC.
• Further research into Fam3C's role in EMT is crucial for developing effective anti-metastatic therapies.