NF-κB Signaling Modulates miR-452-5p and miR-335-5p Expression to Functionally Decrease Epithelial Ovarian Cancer...

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• Epithelial ovarian cancer (EOC) is a leading cause of cancer death, with relapse often driven by chemoresistant tumor-initiating cells (TICs).
• The NF-κB pathway, involving transcription factors RelA and RelB, is implicated in TIC chemoresistance and survival.
• NF-κB regulates genes including microRNAs (miRNAs), which are small non-coding RNAs involved in gene regulation.

Purpose of the Study:

• To investigate the hypothesis that NF-κB signaling differentially regulates miRNA expression through RelA and RelB to support TIC persistence in EOC.
• To identify specific miRNAs regulated by RelA and RelB in EOC TICs.

Main Methods:

• Stable expression of inducible shRNA in OV90 EOC cells to knockdown RELA or RELB.
• Next-generation sequencing (miR-seq) to analyze miRNA expression profiles in TIC versus adherent conditions.
• Quantitative real-time PCR (qPCR) to validate differentially expressed miRNAs.
• Functional assays to assess the impact of miRNA modulation on TIC stem-like potential.

Main Results:

• NF-κB transcription factors RelA and RelB differentially regulate specific miRNAs in EOC TICs.
• hsa-miR-452-5p expression decreased when either RELA or RELB was depleted.
• hsa-miR-335-5p expression increased when RELA was depleted.
• Inhibiting hsa-miR-452-5p or mimicking hsa-miR-335-5p functionally reduced TIC stem-like potential.

Conclusions:

• NF-κB transcription factors RelA and RelB play a novel role in modulating miRNA expression in EOC cells.
• These findings enhance the understanding of mechanisms driving EOC TIC persistence and chemoresistance.
• Targeting NF-κB-regulated miRNAs may offer new therapeutic strategies for preventing EOC recurrence.