Isotopically nonstationary 13C flux analysis of Myc-induced metabolic reprogramming in B-cells

Taylor A. Murphy, Chi V. Dang, Jamey D. Young

Research output: Contribution to journalArticlepeer-review

Abstract

We assessed several methods of 13C 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.

Original languageEnglish (US)
Pages (from-to)206-217
Number of pages12
JournalMetabolic Engineering
Volume15
Issue number1
DOIs
StatePublished - Jan 2013
Externally publishedYes

Keywords

  • Cancer metabolism
  • Isotopomer analysis
  • Lymphoma
  • Mass spectrometry
  • Metabolic flux analysis
  • Warburg effect

ASJC Scopus subject areas

  • Bioengineering
  • Biotechnology
  • Applied Microbiology and Biotechnology

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