New Therapeutic Strategy Targets Glioblastoma Resistance

Glioblastoma multiforme (GBM) is recognized as the most common and aggressive form of adult brain cancer, characterized by its resistance to treatment and a median survival rate of only 14 months post-diagnosis. This resistance is attributed to the extensive genetic variability among glioblastoma cells and the immunosuppressive microenvironment that the tumor fosters, which significantly hinders the effectiveness of immunotherapies.

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Researchers from Ludwig Lausanne, led by Johanna Joyce and former postdoc Ángel Álvarez-Prado, have identified a promising drug target in glioblastoma cells: the protein ADAR1. Their study, published in *Cell Reports*, demonstrates that the loss of ADAR1 can halt the proliferation of various GBM cell types while simultaneously reprogramming the tumor microenvironment into a state that is hostile to tumors. This dual action presents a novel therapeutic strategy aimed at overcoming the inherent resistance of GBM.

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The research indicates that disabling ADAR1 activates the innate antiviral response in mammalian cells, which in turn disrupts cancer cell proliferation. The team observed that ADAR1 loss not only inhibited the growth of GBM cells in genetically distinct mouse models but also extended survival rates in these models. Furthermore, the deletion of ADAR1 amplified inflammatory responses stimulated by interferon-stimulated genes (ISGs), leading to an increase in immune cells capable of attacking cancer cells, such as CD8+ T cells and natural killer cells.

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Álvarez-Prado highlighted the potential benefits of this approach, stating that it could enhance current treatment modalities by addressing the genetic diversity of glioblastomas, targeting a vulnerability unique to cancer cells, and simultaneously attacking the tumor from within while activating the immune system from outside. This strategy could lead to safer treatment options that spare healthy cells.

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The next steps for the Álvarez-Prado lab involve developing an ADAR1 inhibitor that can effectively penetrate the brain and conducting preclinical studies that better mimic human GBM tumors. This research aims to translate the findings into viable therapeutic options for patients suffering from this challenging cancer.

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• “This study provides proof-of-concept for an entirely new strategy for GBM therapy—flipping the switch on the body’s innate virus-fighting machinery and turning it against the tumor,” — Johanna Joyce, Researcher

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• “If translated to human use, our strategy could improve on current therapeutic approaches in three ways,” — Ángel Álvarez-Prado, Researcher

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The identification of ADAR1 as a therapeutic target represents a significant advancement in the fight against glioblastoma. By leveraging the body's innate immune responses, this innovative approach may pave the way for more effective treatments, potentially improving survival outcomes for patients diagnosed with this aggressive cancer.

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