Forkhead box P3 promotes breast cancer cell apoptosis by regulating programmed cell death 4 expression

Area of Science:

• Molecular Biology
• Genetics
• Oncology

Background:

• Forkhead box P3 (FOXP3) is an X-linked tumor suppressor gene implicated in breast cancer.
• The precise role of FOXP3 in regulating breast cancer cell apoptosis remains largely uncharacterized.

Purpose of the Study:

• To elucidate the molecular mechanisms by which FOXP3 influences breast cancer apoptosis.
• To identify genes and biological pathways regulated by FOXP3 in breast cancer cells.

Main Methods:

• RNA sequencing was employed to compare FOXP3-overexpressing MDA-MB-231 cells with control cells.
• Functional enrichment analysis and gene set enrichment analysis were performed on differentially expressed genes.
• Reverse transcription-quantitative PCR and western blotting validated gene and protein expression.
• Analysis of public clinical databases assessed PDCD4 expression in relation to breast cancer stages.

Main Results:

• FOXP3 overexpression led to differential gene expression enriched in pathways including phagosomes and phospholipase D signaling.
• A gene signature associated with apoptosis was enriched in FOXP3-overexpressing cells.
• Programmed cell death 4 (PDCD4), a key apoptosis regulator, was upregulated by FOXP3.
• PDCD4 expression levels correlated with clinical stages in breast cancer patient samples.

Conclusions:

• FOXP3 promotes breast cancer cell apoptosis through the upregulation of PDCD4.
• FOXP3 exerts a tumor suppressive function in breast cancer by modulating apoptosis.
• The FOXP3-PDCD4 axis represents a potential therapeutic target in breast cancer treatment.