Gene Expression Reprogramming by Citrate Supplementation Reduces HepG2 Cell Migration and Invasion.

Area of Science:

• Cellular metabolism
• Molecular oncology
• Transcriptomics

Background:

• Citrate is a critical metabolite in both normal and cancer cell energy pathways.
• Understanding citrate's role in hepatocellular carcinoma (HCC) is crucial for developing targeted therapies.

Purpose of the Study:

• To investigate the impact of extracellular citrate supplementation on HepG2 cell gene expression.
• To identify specific metabolic pathways and genes affected by citrate in liver cancer cells.

Main Methods:

• HepG2 cells were treated with 10 mM extracellular citrate.
• Whole transcriptome analysis and gene set enrichment analysis (GSEA) were employed.
• Quantitative real-time PCR (qRT-PCR) validated key gene expression changes.

Main Results:

• Citrate treatment caused significant dysregulation of 3551 genes in HepG2 cells.
• Lipid and RNA metabolism pathways were most affected by differentially expressed genes.
• Upregulation of cytochrome P450 family genes, including the tumor suppressor CYP3A5, was observed.

Conclusions:

• Extracellular citrate reprograms gene expression in liver cancer cells, influencing key metabolic processes.
• Citrate-induced modulation of cytochrome P450 genes, like CYP3A5, suggests potential for enhancing chemotherapy efficacy and reducing HCC tumor aggressiveness.