IFN-γ Triggered IFITM2 Expression to Induce Malignant Phenotype in Elderly GBM

Area of Science:

• Oncology
• Immunology
• Genomics

Background:

• Advanced age is a risk factor for poor glioblastoma (GBM) outcomes.
• The tumor microenvironment (TME) differs significantly between elderly GBM (eGBM) and young GBM (yGBM) patients, impacting clinical results.

Purpose of the Study:

• To investigate the molecular and cellular differences in the TME between eGBM and yGBM.
• To explore the role of Interferon-gamma (IFN-γ) and IFITM2 in eGBM progression.

Main Methods:

• Analysis of RNA sequencing and array data from CGGA, TCGA, and GSE16011 datasets.
• Immunohistochemistry (IHC) to assess CD8+ cell and IFITM2 protein expression.
• Reverse transcription-polymerase chain reaction (RT-PCR), Western blotting (WB), and small-interfering RNA (siRNA) for functional studies.

Main Results:

• eGBM exhibits an inflammatory TME with enriched chemotaxis and inflammatory cytokine genes, and increased CD8+ T cell infiltration.
• Higher IFITM2 expression and activated IFN-γ response pathway correlate with shorter survival in eGBM.
• IFN-γ activation of IFITM2 contributes to the malignant phenotype in eGBM.

Conclusions:

• Elderly GBM is characterized by an inflammatory TME and elevated IFITM2, driven by IFN-γ, leading to poor prognosis.
• IFITM2 plays a crucial role in IFN-γ-induced GBM malignancy, particularly in elderly patients.