Abstract
Metabolic reprogramming in cancer is manifested by persistent aerobic glycolysis and suppression of mitochondrial function and is known as the Warburg effect. The Warburg effect contributes to cancer progression and is considered to be a promising therapeutic target. Understanding the mechanisms used by cancer cells to suppress their mitochondria may lead to development of new approaches to reverse metabolic reprogramming. We have evaluated mitochondrial function and morphology in poorly respiring LM7 and 143B osteosarcoma (OS) cell lines showing the Warburg effect in comparison with actively respiring Saos2 and HOS OS cells and noncancerous osteoblastic hFOB cells. In LM7 and 143B cells, we detected markers of the mitochondrial permeability transition (MPT), such as mitochondrial swelling, depolarization, and membrane permeabilization. In addition, we detected mitochondrial swelling in human OS xenografts in mice and archival human OS specimens using electron microscopy. The MPT inhibitor sanglifehrin A reversed MPT markers and increased respiration in LM7 and 143B cells. Our data suggest that the MPT may play a role in suppression of mitochondrial function, contributing to the Warburg effect in cancer.
Highlights
The Warburg effect in cancer is manifested by increased glycolysis and decreased respiration
We observed suppression of mitochondrial function and up-regulation of glycolysis in LM7 and 143B cells compared with Saos2 and HOS cells and noncancerous Human fetal osteoblasts (hFOB) cells under aerobic conditions
We studied an array of cell lines of similar origin, such as normal osteoblasts and four cancerous OS cells
Summary
The Warburg effect in cancer is manifested by increased glycolysis and decreased respiration. Results: OS cells showing the Warburg effect have markers of the mitochondrial permeability transition (MPT). Conclusion: MPT plays a possible role in suppression of mitochondrial function in OS. Significance: Our data implicate the MPT in metabolic reprogramming in cancer. Metabolic reprogramming in cancer is manifested by persistent aerobic glycolysis and suppression of mitochondrial function and is known as the Warburg effect. Understanding the mechanisms used by cancer cells to suppress their mitochondria may lead to development of new approaches to reverse metabolic reprogramming. In LM7 and 143B cells, we detected markers of the mitochondrial permeability transition (MPT), such as mitochondrial swelling, depolarization, and membrane permeabilization. Our data suggest that the MPT may play a role in suppression of mitochondrial function, contributing to the Warburg effect in cancer
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