Paracaspase MALT1 regulates glioma cell survival by controlling endo-lysosome homeostasis

Abstract : Glioblastoma is one of the most lethal forms of adult cancer with a median survival of around 15 months. A potential treatment strategy involves targeting glioblastoma stem-like cells (GSC), which constitute a cell autonomous reservoir of aberrant cells able to initiate, maintain, and repopulate the tumor mass. Here, we report that the expression of the paracaspase mucosa-associated lymphoid tissue l (MALT1), a protease previously linked to antigen receptor-mediated NF-jB activation and B-cell lymphoma survival, inversely correlates with patient probability of survival. The knockdown of MALT1 largely impaired the expansion of patient-derived stem-like cells in vitro, and this could be recapitulated with pharmacological inhibitors, in vitro and in vivo. Blocking MALT1 protease activity increases the endo-lysosome abundance, impairs autophagic flux, and culminates in lysosomal-mediated cell death, concomitantly with mTOR inactiva-tion and dispersion from endo-lysosomes. These findings place MALT1 as a new druggable target involved in glioblastoma and unveil ways to modulate the homeostasis of endo-lysosomes.
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Submitted on : Thursday, December 5, 2019 - 2:11:23 PM
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Kathryn Jacobs, Gwennan André-Grégoire, Clément Maghe, An Thys, Ying Li, et al.. Paracaspase MALT1 regulates glioma cell survival by controlling endo-lysosome homeostasis. EMBO Journal, EMBO Press, 2019, pp.e102030. ⟨10.15252/embj.2019102030⟩. ⟨inserm-02395350⟩

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