[High glucose induces INS-1 cell apoptosis by activating nuclear factor-κB]

Area of Science:

• Molecular Biology
• Cell Biology
• Endocrinology

Context:

• High glucose levels are implicated in pancreatic beta-cell dysfunction.
• Nuclear transcription factor-κB (NF-κB) signaling pathways play critical roles in cellular stress responses.
• INS-1 cells, a rat insulinoma cell line, are a common model for studying beta-cell function and apoptosis.

Purpose:

• To investigate the role of NF-κB activation in high glucose-induced apoptosis of INS-1 cells.
• To determine if inhibiting NF-κB can prevent high glucose-induced cell death in this model system.

Summary:

• Rat insulinoma (INS-1) cells were exposed to varying glucose concentrations (11.1 mmol/L and 33.3 mmol/L) or high glucose with NF-κB inhibitors.
• Quantitative RT-PCR and Western blotting assessed IKK-beta mRNA and NF-κB P65 protein expression, respectively.
• Annexin V-PI staining evaluated apoptosis rates. High glucose (33.3 mmol/L) significantly increased IKK-beta mRNA, nuclear P65 protein, and apoptosis.
• Co-administration of NF-κB inhibitors with high glucose significantly reduced these markers, indicating a protective effect.

Impact:

• This study elucidates a key molecular mechanism underlying high glucose-induced beta-cell apoptosis.
• Findings suggest that targeting NF-κB activation could be a therapeutic strategy to preserve beta-cell function in conditions like diabetes.