Gene induction by glycyrol to apoptosis through endonuclease G in tumor cells and prediction of oncogene function by...

Area of Science:

• Pharmacology
• Molecular Biology
• Immunology

Background:

• Glycyrrhiza uralensis possesses known anti-inflammatory properties.
• The flavonoid glycyrol (GC) is isolated from G. uralensis.
• Nuclear factor-kappaB (NF-κB) is a key regulator of inflammatory responses.

Purpose of the Study:

• To investigate the effect of glycyrol (GC) on global gene expression.
• To elucidate the mechanism by which GC modulates NF-κB activity.
• To explore GC's role in apoptosis pathways.

Main Methods:

• High-density oligonucleotide microarrays for gene expression profiling.
• Luciferase reporter assays to measure NF-κB transcriptional activity.
• Reverse transcription-polymerase chain reaction (RT-PCR) for gene validation.
• Western blot analysis to assess I-κB degradation.

Main Results:

• GC significantly inhibited phorbol ester-induced NF-κB-dependent transcriptional activity.
• Microarray analysis revealed downregulation of inflammatory genes (e.g., CCL2, CCL7, CD44, HSPB8) by GC.
• GC treatment inhibited I-κB degradation, a key step in NF-κB activation.
• GC induced p53-dependent apoptosis via endonuclease G in human kidney cells.

Conclusions:

• Glycyrol (GC) effectively suppresses inflammatory gene expression by inhibiting NF-κB activation.
• GC demonstrates a pro-apoptotic effect in human kidney cells, potentially through endonuclease G.
• These findings highlight the therapeutic potential of GC in inflammatory diseases and cancer.