1 Ocak 2023 Dergi makalesi Açık Erişim

Nakhle, Jean; Khattar, Khattar; Ozkan, Tuelin; Boughlita, Adel; Moussa, Daouda Abba; Darlix, Amelie; Lorcy, Frederique; Rigau, Valerie; Bauchet, Luc; Gerbal-Chaloin, Sabine; Daujat-Chavanieu, Martine; Bellvert, Floriant; Turchi, Laurent; Virolle, Thierry; Hugnot, Jean-Philippe; Buisine, Nicolas; Galloni, Mireille; Dardalhon, Valerie; Rodriguez, Anne-Marie; Vignais, Marie-Luce

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    <subfield code="a">Mitochondria Transfer from Mesenchymal Stem Cells Confers Chemoresistance to Glioblastoma Stem Cells through Metabolic Rewiring</subfield>
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    <subfield code="a">&lt;p&gt;Glioblastomas (GBM) are heterogeneous tumors with high metabolic plasticity. Their poor prognosis is linked to the presence of glioblastoma stem cells (GSC), which support resistance to therapy, notably to temozolomide (TMZ). Mesenchymal stem cells (MSC) recruitment to GBM contributes to GSC chemoresistance, by mechanisms still poorly understood. Here, we provide evidence that MSCs transfer mitochondria to GSCs through tunneling nanotubes, which enhances GSCs resistance to TMZ. More precisely, our metabolomics analyses reveal that MSC mitochondria induce GSCs metabolic reprograming, with a nutrient shift from glucose to glutamine, a rewiring of the tricarboxylic acid cycle from glutaminolysis to reductive carboxylation and increase in orotate turnover as well as in pyrimidine and purine synthesis. Metabolomics analysis of GBM patient tissues at relapse after TMZ treatment documents increased concentrations of AMP, CMP, GMP, and UMP nucleotides and thus corroborate our in vitro analyses. Finally, we provide a mechanism whereby mitochondrial transfer from MSCs to GSCs contributes to GBM resistance to TMZ therapy, by demonstrating that inhibition of orotate production by Brequinar (BRQ) restores TMZ sensitivity in GSCs with acquired mitochondria. Altogether, these results identify a mechanism for GBM resistance to TMZ and reveal a metabolic dependency of chemoresistant GBM following the acquisition of exogenous mitochondria, which opens therapeutic perspectives based on synthetic lethality between TMZ and BRQ.Significance: Mitochondria acquired from MSCs enhance the chemoresistance of GBMs. The discovery that they also generate metabolic vulnerability in GSCs paves the way for novel therapeutic approaches.&lt;/p&gt;</subfield>
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