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Metabolic signatures uncover distinct targets in molecular subsets of diffuse large B cell lymphoma
Pilar Caro1, Amar U Kishan, Erik Norberg
1Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02115, USA.
Abstract:
Molecular signatures have identified several subsets of diffuse large B cell lymphoma (DLBCL) and rational targets within the B cell receptor (BCR) signaling axis. The OxPhos-DLBCL subset, which harbors the signature of genes involved in mitochondrial metabolism, is insensitive to inhibition of BCR survival signaling but is functionally undefined. We show that, compared with BCR-DLBCLs, OxPhos-DLBCLs display enhanced mitochondrial energy transduction, greater incorporation of nutrient-derived carbons into the tricarboxylic acid cycle, and increased glutathione levels. Moreover, perturbation of the fatty acid oxidation program and glutathione synthesis proved selectively toxic to this tumor subset. Our analysis provides evidence for distinct metabolic fingerprints and associated survival mechanisms in DLBCL and may have therapeutic implications.
Insights
Researchers identified a distinct metabolic profile in OxPhos diffuse large B cell lymphoma (DLBCL), characterized by enhanced mitochondrial activity and glutathione levels. Targeting fatty acid oxidation and glutathione synthesis selectively harmed these DLBCL cells, suggesting new therapeutic strategies.
Area of Science:
- Oncology
- Metabolic pathways
- Cellular metabolism
Background:
- Diffuse large B cell lymphoma (DLBCL) comprises molecularly distinct subsets.
- The OxPhos-DLBCL subset is defined by mitochondrial metabolism gene signatures.
- This subset is resistant to B cell receptor (BCR) signaling inhibitors and remains functionally uncharacterized.
Purpose of the Study:
- To functionally characterize the OxPhos-DLBCL subset.
- To identify unique metabolic vulnerabilities in OxPhos-DLBCL.
- To explore potential therapeutic targets specific to this DLBCL subtype.
Main Methods:
- Comparative analysis of metabolic profiles between OxPhos-DLBCL and BCR-DLBCL subsets.
- Assessment of mitochondrial energy transduction and nutrient incorporation.
- Investigation of glutathione synthesis and fatty acid oxidation pathways.
- Selective toxicity assays targeting metabolic perturbations.
Main Results:
- OxPhos-DLBCL exhibits heightened mitochondrial energy production and tricarboxylic acid cycle activity.
- Elevated glutathione levels were observed in the OxPhos-DLBCL subset.
- Inhibition of fatty acid oxidation and glutathione synthesis selectively induced toxicity in OxPhos-DLBCL.
- Distinct metabolic fingerprints differentiate DLBCL subsets.
Conclusions:
- OxPhos-DLBCL possesses unique metabolic characteristics and survival mechanisms.
- Metabolic pathways, specifically fatty acid oxidation and glutathione synthesis, represent potential therapeutic targets for OxPhos-DLBCL.
- Understanding these metabolic differences can guide the development of targeted therapies for DLBCL.
