期刊
SCIENCE SIGNALING
卷 14, 期 664, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/scisignal.abc4436
关键词
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资金
- Intramural Research Programs of NCI-CCR
- NICHD
- Frederick National Laboratory for Cancer Research, NIH [HHSN26120080001E]
Understanding the mechanism of Warburg shift to aerobic glycolysis is essential for defining the metabolic basis of cancer. HLRCC, an aggressive cancer, is characterized by impaired mitochondrial respiratory chain, loss of expression of mtDNA-encoded subunits, and accumulation of fumarate, leading to the promotion of aerobic glycolysis and disease progression. Accumulation of fumarate in HLRCC tumors disrupts mtDNA replication and proofreading, causing loss of respiratory chain components.
Understanding the mechanisms of the Warburg shift to aerobic glycolysis is critical to defining the metabolic basis of cancer. Hereditary leiomyomatosis and renal cell carcinoma (HLRCC) is an aggressive cancer characterized by biallelic inactivation of the gene encoding the Krebs cycle enzyme fumarate hydratase, an early shift to aerobic glycolysis, and rapid metastasis. We observed impairment of the mitochondrial respiratory chain in tumors from patients with HLRCC. Biochemical and transcriptomic analyses revealed that respiratory chain dysfunction in the tumors was due to loss of expression of mitochondrial DNA (mtDNA)-encoded subunits of respiratory chain complexes, caused by a marked decrease in mtDNA content and increased mtDNA mutations. We demonstrated that accumulation of fumarate in HLRCC tumors inactivated the core factors responsible for replication and proofreading of mtDNA, leading to loss of respiratory chain components, thereby promoting the shift to aerobic glycolysis and disease progression in this prototypic model of glucose-dependent human cancer.
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