High Glucose Increases DNA Damage and Elevates the Expression of Multiple DDR Genes

Area of Science:

• Molecular Biology
• Genetics
• Cancer Research

Background:

• DNA Damage Response (DDR) pathways are crucial for maintaining genome stability by repairing DNA damage.
• Elevated glucose levels are implicated in genome instability, but their precise relationship with DDR remains under-explored.
• Triple-negative breast cancer (TNBC) is an aggressive subtype with limited treatment options.

Purpose of the Study:

• To investigate the impact of high glucose on the transcriptome of normal and cancerous breast cell lines.
• To identify dysregulated DNA Damage Response (DDR) genes in response to varying glucose conditions.
• To elucidate the role of DDR in mitigating glucose-induced DNA damage in TNBC.

Main Methods:

• Bioinformatics analysis of microarray data from MCF10A and MDA-MB-231 cell lines cultured in high glucose (HG) or with 2-deoxyglucose (2DG).
• Quantitative Polymerase Chain Reaction (qPCR) to validate gene expression changes.
• Comet assay to assess DNA damage in TNBC cells under HG conditions.

Main Results:

• Bioinformatics analysis revealed significant upregulation of multiple DDR genes in both cell lines under HG conditions.
• Comet assays demonstrated substantial DNA damage in TNBC cells exposed to HG.
• qPCR confirmed the upregulation of several DDR genes in TNBC cells treated with HG.

Conclusions:

• High glucose levels induce significant DNA damage in triple-negative breast cancer cells.
• The DNA Damage Response (DDR) pathways are upregulated in response to high glucose, indicating a critical role in cellular defense.
• Targeting DDR pathways may offer novel therapeutic strategies for TNBC in high-glucose environments.