2015
DOI: 10.1016/j.copbio.2015.02.003
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A roadmap for interpreting 13 C metabolite labeling patterns from cells

Abstract: Measuring intracellular metabolism has increasingly led to important insights in biomedical research. 13C tracer analysis, although less information-rich than quantitative 13C flux analysis that requires computational data integration, has been established as a time-efficient method to unravel relative pathway activities, qualitative changes in pathway contributions, and nutrient contributions. Here, we review selected key issues in interpreting 13C metabolite labeling patterns, with the goal of drawing accura… Show more

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Cited by 520 publications
(478 citation statements)
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References 100 publications
(89 reference statements)
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“…To test this hypothesis, we first confirmed the PPP activity increase in PTL-treated AML cells by a second set of labeling experiments using the duallabeled [ 13 C 1,2 ]glucose. In this particular experiment, because one carbon atom is lost in the form of CO 2 during glucose oxidation steps through the PPP (38), the Mϩ1 isotopologue of [ 13 C]glyceraldehyde 3-phosphate is exclusively generated by glucose flux through the PPP, not glycolysis. Thus, the level of the Mϩ1 isotopologue represents the PPP activity.…”
Section: Identification Of the Proteomic Interactome Of Ptl In Primarymentioning
confidence: 99%
See 1 more Smart Citation
“…To test this hypothesis, we first confirmed the PPP activity increase in PTL-treated AML cells by a second set of labeling experiments using the duallabeled [ 13 C 1,2 ]glucose. In this particular experiment, because one carbon atom is lost in the form of CO 2 during glucose oxidation steps through the PPP (38), the Mϩ1 isotopologue of [ 13 C]glyceraldehyde 3-phosphate is exclusively generated by glucose flux through the PPP, not glycolysis. Thus, the level of the Mϩ1 isotopologue represents the PPP activity.…”
Section: Identification Of the Proteomic Interactome Of Ptl In Primarymentioning
confidence: 99%
“…Calibration was performed before each analysis against positive or negative ion mode calibration mixes (Thermo Fisher Scientific) to ensure sub-ppm error on the intact mass. Upon conversion of .raw files into .mzXML format using MassMatrix, metabolite, and isotopologue assignments were performed using the software Maven following the rationale described by Buescher et al (38). Assignments were further confirmed by chemical formula determination from isotopic patterns and accurate intact mass and retention times against over 650 standards, including commercially available glycolytic and Krebs cycle intermediates, amino acids, glutathione intermediates, and nucleoside phosphates (Sigma, IROATech).…”
Section: Lc-ms/ms-based Identification Of the Proteomicmentioning
confidence: 99%
“…Changes in the metabolic fate of glucose can be described by the fractional contribution (FC) of 13 C from 13 C 6 -glucose to citrate [FC(citrate)] or to lactate [FC(lactate)] (Buescher et al, 2015). FC(citrate) and FC(lactate) were calculated based on a mass distribution vector (MDV) describing the enrichment of each isotopomer (Fig.…”
mentioning
confidence: 99%
“…Multiplex assays of 4 serum-based metabolite classifiers consisting of xylose, glutamate, aspartate and one unknown [Bin_225393] yielded accuracies of 66.9% and 72.7% in the discovery and test sets, respectively [4]. While these results are very encouraging, their performance may not be purely a reflection of cancer, given that metabolites such glutamate are also elevated in other pathologies and co-morbidities, such as diabetes [18,19]. Thus, in the case of glutamate, its value as a lung cancer-specific serum biomarker may hold very limited value when screening the general population.…”
Section: Commentarymentioning
confidence: 99%