A Role for Cytosolic Fumarate Hydratase in Urea Cycle Metabolism and Renal Neoplasia
Overview
Cell Biology
Molecular Biology
Authors
Affiliations
The identification of mutated metabolic enzymes in hereditary cancer syndromes has established a direct link between metabolic dysregulation and cancer. Mutations in the Krebs cycle enzyme, fumarate hydratase (FH), predispose affected individuals to leiomyomas, renal cysts, and cancers, though the respective pathogenic roles of mitochondrial and cytosolic FH isoforms remain undefined. On the basis of comprehensive metabolomic analyses, we demonstrate that FH1-deficient cells and tissues exhibit defects in the urea cycle/arginine metabolism. Remarkably, transgenic re-expression of cytosolic FH ameliorated both renal cyst development and urea cycle defects associated with renal-specific FH1 deletion in mice. Furthermore, acute arginine depletion significantly reduced the viability of FH1-deficient cells in comparison to controls. Our findings highlight the importance of extramitochondrial metabolic pathways in FH-associated oncogenesis and the urea cycle/arginine metabolism as a potential therapeutic target.
Baldea I, Moldovan R, Nagy A, Bolfa P, Decea R, Miclaus M Int J Mol Sci. 2025; 25(24.
PMID: 39769112 PMC: 11678873. DOI: 10.3390/ijms252413346.
Cheng P, Xia R, Wang X Transl Cancer Res. 2024; 13(6):3126-3141.
PMID: 38988939 PMC: 11231789. DOI: 10.21037/tcr-24-21.
Sasajima N, Sumazaki M, Oshima Y, Ito M, Yajima S, Takizawa H Int J Mol Sci. 2024; 25(10).
PMID: 38791507 PMC: 11121488. DOI: 10.3390/ijms25105470.
Rewiring of RNA methylation by the oncometabolite fumarate in renal cell carcinoma.
Fitzsimmons C, Mandler M, Lunger J, Chan D, Maligireddy S, Schmiechen A NAR Cancer. 2024; 6(1):zcae004.
PMID: 38328795 PMC: 10849186. DOI: 10.1093/narcan/zcae004.
Fumarate hydratase (FH) and cancer: a paradigm of oncometabolism.
Valcarcel-Jimenez L, Frezza C Br J Cancer. 2023; 129(10):1546-1557.
PMID: 37689804 PMC: 10645937. DOI: 10.1038/s41416-023-02412-w.