Mutant IDH and non-mutant chondrosarcomas display distinct cellular metabolomes

Area of Science:

• Oncology
• Metabolomics
• Biochemistry

Background:

• Chondrosarcomas frequently exhibit genetic alterations, including mutations in isocitrate dehydrogenase 1 (IDH1) and IDH2 genes.
• The metabolic and energetic consequences of IDH mutations in chondrosarcomas remain largely unexplored.
• IDH mutations are implicated in the malignant transformation of chondrosarcomas, necessitating investigation into associated metabolic changes.

Purpose of the Study:

• To investigate and characterize the metabolomic differences between IDH mutant and non-mutant chondrosarcomas.
• To identify specific metabolic pathways affected by IDH mutations in chondrosarcoma.

Main Methods:

• Targeted mass spectrometry was employed to profile over 69 metabolites in 17 patient-derived xenografts.
• Uniform Manifold Approximation and Projection (UMAP) analysis was utilized to examine genotype-based similarities and differences in metabolic profiles.
• Gene expression profiling data was analyzed to correlate metabolic changes with gene expression and patient survival.

Main Results:

• UMAP analysis revealed distinct metabolic profiles for IDH mutant versus non-mutant chondrosarcomas.
• Significant alterations were observed in organic acid intermediates of the tricarboxylic acid (TCA) cycle, amino acids, and acylcarnitines.
• Elevated lactate and late TCA cycle intermediates, along with broad amino acid elevation, suggest increased glycolysis and anaplerosis in IDH mutant chondrosarcomas.

Conclusions:

• IDH mutations induce global metabolic reprogramming in chondrosarcomas.
• These findings illuminate deranged metabolic pathways in chondrosarcoma pathogenesis.
• Metabolic alterations in IDH mutant chondrosarcomas correlate with gene expression and patient survival.