SELENOF Controls Proliferation and Cell Death in Breast-Derived Immortalized and Cancer Cells.

Area of Science:

• Oncology
• Molecular Biology
• Cell Biology

Background:

• SELENOF expression is decreased in aggressive breast tumors.
• Reduced SELENOF may promote breast tumorigenesis.

Purpose of the Study:

• To investigate the role of SELENOF in breast cell proliferation and tumorigenesis.
• To elucidate the mechanisms by which SELENOF influences cell cycle regulation and cell death.

Main Methods:

• Deletion and overexpression of SELENOF in MCF-10A breast epithelial cells.
• Analysis of cell proliferation in adherent and 3D cultures.
• Assessment of cell-cycle regulators p21 and p27.
• Evaluation of apoptosis and autophagy.
• Correlation with METABRIC patient database.

Main Results:

• SELENOF deletion enhanced proliferation and abrogated apoptosis and autophagy, leading to luminal filling in 3D cultures.
• SELENOF modulation affected p21 and p27 levels, consistent with patient data.
• SELENOF overexpression induced apoptosis and autophagy.

Conclusions:

• SELENOF acts as a tumor suppressor in breast cancer.
• Loss of SELENOF contributes to breast cancer development by promoting proliferation and inhibiting cell death.
• SELENOF regulates breast cancer cell fate through p21 and p27.