ArticleMolecular cancer2026
ADSL drives fumarate mediated scrib-rictor complex formation to promote metastasis dissemination in triple-negative breast cancer.
Article in Molecular cancer, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundTriple-negative breast cancer (TNBC) is characterized by aggressive metastatic behavior and limited therapeutic options. Although metabolic reprogramming is increasingly recognized as a hallmark of TNBC, the mechanisms by which specific metabolic enzymes and intermediates drive metastasis remain poorly defined.
methodsWe performed untargeted metabolomic profiling on TNBC tumors and matched normal tissues to identify dysregulated metabolic pathways. Functional assays, chemoproteomic succination profiling, molecular interaction analyses, and in vivo cancer metastasis models were used to define the mechanistic and biological consequences of altered metabolism. In vitro experiments validated the effects of N-acetylcysteine (NAC) in TNBC cell lines.
resultsMetabolomic analyses revealed aberrant activation of the alanine-aspartate-glutamate axis and upregulation of adenylosuccinate lyase (ADSL) in TNBC. ADSL promoted tumor cell proliferation and metastasis by generating fumarate, which accumulated primarily through covalent protein succination. Chemoproteomic profiling identified the cell polarity regulator SCRIB as a critical fumarate target. Fumarate-mediated succination of SCRIB impaired its membrane localization, promoted epithelial-mesenchymal transition, and facilitated aberrant interaction with the mTORC2 component RICTOR, leading to activation of AKT/mTOR signaling. Genetic disruption of SCRIB succination abrogated these effects. Importantly, pharmacological perturbation of fumarate using NAC reduced SCRIB succination and attenuated the malignant phenotypes of TNBC cells in vitro.
conclusionsThese findings identify an ADSL-fumarate-SCRIB signaling axis that links metabolic reprogramming to the loss of cell polarity and activation of pro-metastatic signaling in TNBC. Targeting fumarate-mediated protein succination represents a previously unrecognized and experimental vulnerability in TNBC.
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