Malformin C preferentially kills glioblastoma stem-like cells via concerted induction of proteotoxic stress and autophagic flux blockade

Glioblastoma is a highly aggressive brain tumor for which there is no cure. The dire prognosis of this disease is largely attributable to a high level of heterogeneity, including the presence of a subpopulation of tumor-initiating glioblastoma stem-like cells (GSCs), which are refractory to chemo- a...

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Hauptverfasser: Phillips, Emma (VerfasserIn) , van Enk, Sizèd (VerfasserIn) , Kildgaard, Sara (VerfasserIn) , Schlue, Silja (VerfasserIn) , Göttmann, Mona (VerfasserIn) , Jennings, Victoria (VerfasserIn) , Bethke, Frederic (VerfasserIn) , Müller, Gabriele (VerfasserIn) , Herold-Mende, Christel (VerfasserIn) , Pastor-Flores, Daniel (VerfasserIn) , Schneider, Martin (VerfasserIn) , Helm, Dominic (VerfasserIn) , Ostenfeld Larsen, Thomas (VerfasserIn) , Goidts, Violaine (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 27 October 2024
In: Molecular oncology
Year: 2025, Jahrgang: 19, Heft: 3, Pages: 785-807
ISSN:1878-0261
DOI:10.1002/1878-0261.13756
Online-Zugang:Verlag, kostenfrei, Volltext: https://doi.org/10.1002/1878-0261.13756
Resolving-System, kostenfrei, Volltext: https://febs.onlinelibrary.wiley.com/doi/10.1002/1878-0261.13756
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Verfasserangaben:Emma Phillips, Sizèd van Enk, Sara Kildgaard, Silja Schlue, Mona Göttmann, Victoria Jennings, Frederic Bethke, Gabriele Müller, Christel Herold-Mende, Daniel Pastor-Flores, Martin Schneider, Dominic Helm, Thomas Ostenfeld Larsen, Violaine Goidts

MARC

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520 |a Glioblastoma is a highly aggressive brain tumor for which there is no cure. The dire prognosis of this disease is largely attributable to a high level of heterogeneity, including the presence of a subpopulation of tumor-initiating glioblastoma stem-like cells (GSCs), which are refractory to chemo- and radiotherapy. Here, in an unbiased marine-derived fungal extract screen, together with bioguided dereplication based on high-resolution mass spectrometry, we identified malformin C to preferentially induce cell death in patient-derived GSCs and explore the potential of this cyclic peptide as a therapeutic agent for glioblastoma. Malformin C significantly reduced tumor growth in an in vivo xenograft model of glioblastoma. Using transcriptomics and chemoproteomics, we found that malformin C binds to many proteins, leading to their aggregation, and rapidly induces the unfolded protein response, including autophagy, in GSCs. Crucially, chemical inhibition of translation using cycloheximide rescued malformin C-induced cell death in GSCs, demonstrating that the proteotoxic effect of the compound is necessary for its cytotoxicity. At the same time, malformin C appears to accumulate in lysosomes, disrupting autophagic flux, and driving cells to death. Supporting this, malformin C synergizes with chloroquine, an inhibitor of autophagy. Strikingly, we observed that autophagic flux is differentially regulated in GSCs compared with normal astrocytes. The sensitivity of GSCs to malformin C highlights the relevance of proteostasis and autophagy as a therapeutic vulnerability in glioblastoma. 
650 4 |a Animals 
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650 4 |a Autophagy 
650 4 |a Brain Neoplasms 
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650 4 |a Cell Line, Tumor 
650 4 |a compound screen 
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650 4 |a Glioblastoma 
650 4 |a Humans 
650 4 |a Mice 
650 4 |a Neoplastic Stem Cells 
650 4 |a proteostasis 
650 4 |a Proteotoxic Stress 
650 4 |a stem cells 
650 4 |a unfolded protein response 
650 4 |a Unfolded Protein Response 
650 4 |a Xenograft Model Antitumor Assays 
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