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• W2916866716 abstract "Abstract In cancer tumors, lactate accumulation was initially attributed to high glucose consumption associated with the Warburg Effect. Now it is evident that lactate can also serve as an energy source in cancer cell metabolism. Additionally, lactate has been shown to promote metastasis, generate gene expression patterns in cancer cells consistent with “cancer stem cell” phenotypes, and result in treatment resistant tumors. Therefore, the goal of this work was to quantify the impact of lactate on metabolism in three breast cell lines (one normal and two breast cancer cell lines – MCF 10A, MCF7, and MDA-MB-231), in order to better understand the role lactate may have in different disease cell types. Parallel labeling metabolic flux analysis ( 13 C-MFA) was used to quantify the intracellular fluxes under normal and high extracellular lactate culture conditions. Additionally, high extracellular lactate cultures were labelled in parallel with [U- 13 C] lactate, which provided qualitative information regarding the lactate uptake and metabolism. The 13 C-MFA model, which incorporated the measured extracellular fluxes and the parallel labeling mass isotopomer distributions (MIDs) for five glycolysis, four tricarboxylic acid cycle (TCA), and three intracellular amino acid metabolites, predicted lower glycolysis fluxes in the high lactate cultures. All three cell lines experienced increased reductive carboxylation of glutamine to citrate in the TCA cycle as a result of high extracellular lactate. Increased reductive carboxylation previously has been observed under hypoxia and other mitochondrial stresses, whereas these cultures were grown aerobically. In addition, this is the first study to investigate the intracellular metabolic responses of different stages of breast cancer progression to high lactate exposure. These results provide insight into the role lactate accumulation has on metabolic reaction distributions in the different disease cell types while the cells are still proliferating in lactate concentrations that do not significantly decrease exponential growth rates." @default.
• W2916866716 created "2019-03-02" @default.
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• W2916866716 date "2019-02-23" @default.
• W2916866716 modified "2023-10-01" @default.
• W2916866716 title "High extracellular lactate increases reductive carboxylation in breast tissue cell lines grown under normoxic conditions" @default.
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• W2916866716 doi "https://doi.org/10.1101/558296" @default.
• W2916866716 hasPublicationYear "2019" @default.
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