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Dissection and Isolation of Murine Glia from Multiple Central Nervous System Regions
Published on: June 4, 2020
Chronic IFN-γ Exposure Induces Divergent Adaptive Programs in Glioblastoma Subtypes.
Elnaz Rahbarlayegh1,2, Natsuko Nomura1, Tiffany M Juarez3
1Pacific Neuroscience Institute, Santa Monica, CA 90404, USA.
Cancers
|May 27, 2026
Summary
Chronic interferon-gamma (IFN-γ) exposure in glioblastoma (GBM) leads to distinct adaptive states, promoting tumor persistence and resistance. Understanding these IFN-γ-driven adaptations is crucial for developing effective GBM immunotherapies.
Area of Science:
- Oncology
- Immunology
- Cancer Biology
Background:
- Glioblastoma (GBM) is largely resistant to immunotherapy due to its immunosuppressive tumor microenvironment.
- Interferon-gamma (IFN-γ) is key in anti-tumor immunity but can paradoxically drive adaptive resistance with chronic exposure.
- The response of GBM cells to sustained IFN-γ signaling and its variation across tumor states is poorly understood.
Purpose of the Study:
- To investigate the long-term adaptive responses of GBM cells to chronic IFN-γ exposure.
- To compare these responses in different GBM subtypes (mesenchymal-like vs. proneural-like).
- To analyze the implications of these adaptations for glioblastoma treatment.
Main Methods:
- Modeled chronic IFN-γ exposure in U87 (mesenchymal-like) and U251 (proneural-like) GBM cells for 28 days.
- Performed integrated analyses of transcriptional, proteomic, and secretory responses.
- Analyzed TCGA glioblastoma datasets for interferon-associated programs and PI3K-AKT pathway activity.
Main Results:
- Initially, IFN-γ suppressed growth in both GBM models, but long-term adaptations diverged.
- U87 cells adopted a persistence-prone state with activated PI3K-AKT signaling.
- U251 cells showed sustained interferon signaling, interferon-related DNA damage resistance signature (IRDS) expression, and suppressed AKT activity.
- These adaptive programs were stable and incompletely reversible after IFN-γ withdrawal.
- Interferon-associated programs and PI3K-AKT activity are present across human GBM subtypes.
Conclusions:
- Chronic IFN-γ exposure induces distinct, lineage-dependent adaptive states in GBM.
- These states link interferon signaling to divergent survival and immune-modulatory programs.
- While IFN-γ can enhance immune activation, prolonged signaling may promote tumor persistence.
- Therapeutic strategies combining IFN-based treatments with interventions targeting adaptive survival pathways and immune reprogramming are supported.
