FOXM1 and STAT3 interaction confers radioresistance in glioblastoma cells

Area of Science:

• Neuro-oncology
• Molecular Biology
• Cancer Research

Background:

• Glioblastoma multiforme (GBM) is an aggressive primary brain tumor with poor prognosis.
• Standard treatment involves surgical resection followed by chemo-radiotherapy.
• Identifying molecular targets to enhance radiosensitivity is crucial for improving GBM treatment outcomes.

Purpose of the Study:

• To investigate the role of Forkhead box protein M1 (FOXM1) as a radiosensitizing target in GBM.
• To elucidate the molecular mechanisms underlying FOXM1's role in GBM radioresistance.
• To explore the prognostic significance of FOXM1 expression in GBM patients.

Main Methods:

• Utilized reverse phase protein arrays (RPPAs) to analyze signaling pathways in irradiated and non-irradiated GBM cells.
• Investigated the effect of FOXM1 inhibition on GBM cell radiosensitivity.
• Employed co-immunoprecipitation and co-localization assays to study protein interactions.
• Analyzed patient data to correlate FOXM1 expression with prognosis.

Main Results:

• Identified high expression of FOXM1 in irradiated GBM cells both in vitro and in vivo.
• Demonstrated that FOXM1 inhibition radiosensitizes GBM cells by affecting cell cycle progression and DNA repair genes.
• Showed that radiation-induced FOXM1 expression is dependent on STAT3 activation, with physical interaction between FOXM1 and phosphorylated STAT3.
• Found that high FOXM1 expression in GBM patients correlates with poor prognosis.

Conclusions:

• FOXM1 plays a significant role in GBM radioresistance, potentially mediated through STAT3 activation.
• Targeting FOXM1 represents a promising therapeutic strategy to enhance the efficacy of radiotherapy in GBM.
• FOXM1 expression level can serve as a prognostic biomarker for GBM patients.