Mutant Isocitrate Dehydrogenase 1 Alters Extracellular Vesicle Secretion and Cargo Composition in Cellular Models

Mutant IDH1 expression in glioblastoma and chondrosarcoma cell models is linked to increased small extracellular vesicle secretion and D2HG packaging into sEVs.

• Why it matters: Tumor communication via sEVs is elevated in gliomas, but how mutant IDH1 and its neomorphic D2HG activity shape sEV production and cargo is unclear.
• What they did: Using glioblastoma and chondrosarcoma cellular models, the study tested sEV release and uptake, treated IDH1 wild type cells with cell-permeable D2HG, and performed untargeted proteomics plus transcriptomics.
• The result: Mutant IDH1 remodeled sEV cargo in a cell type-specific way—chondrosarcoma sEVs were enriched for one-carbon metabolism enzymes, while glioma sEVs carried lysosomal luminal proteins and ER chaperones, and these sEVs reduced nascent protein synthesis in IDH1 wild type recipient cells.

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