Journal
METABOLIC ENGINEERING
Volume 15, Issue -, Pages 206-217Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ymben.2012.07.008
Keywords
Metabolic flux analysis; Isotopomer analysis; Cancer metabolism; Warburg effect; Mass spectrometry; Lymphoma
Categories
Funding
- NIH [R21 CA155964]
- Vanderbilt Discovery Award
- NATIONAL CANCER INSTITUTE [R21CA155964, P30CA016520, R01CA057341] Funding Source: NIH RePORTER
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We assessed several methods of C-13 metabolic flux analysis (MFA) and found that isotopically nonstationary MFA achieved maximum flux resolution in cultured P493-6 B-cells, which have been engineered to provide tunable expression of the Myc oncoprotein. Comparison of metabolic flux maps obtained under oncogenic (High) and endogenous (Low) Myc expression levels revealed network-wide reprogramming in response to ectopic Myc expression. High Myc cells relied more heavily on mitochondrial oxidative metabolism than Low Myc cells and globally upregulated their consumption of amino acids relative to glucose. TCA cycle and amphibolic mitochondrial pathways exhibited 2- to 4-fold flux increases in High Myc cells, in contrast to modest increases in glucose uptake and lactate excretion. Because our MFA approach relied exclusively upon isotopic measurements of protein-bound amino acids and RNA-bound ribose, it is readily applicable to more complex tumor models that are not amenable to direct extraction and isotopic analysis of free intracellular metabolites. (C) 2012 Elsevier Inc. All rights reserved.
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