NMR Methods for Quantitative Isotopomer Rates in Real-Time Metabolism of Cells

Tracer-based metabolism is becoming increasingly important to study metabolic mechanisms in cells. NMR offers several approaches to measure label incorporation in metabolites, including 13C and 1H-detected spectra. The latter are generally more sensitive but quantification depends on the proton carb...

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Bibliographic Details
Published in:bioRxiv
Main Authors: Michelle Ac Reed, Roberts, Jennie, Gierth, Peter, Kupce, Eriks, Guenther, Ulrich L
Format: Paper
Language:English
Published: Cold Spring Harbor Cold Spring Harbor Laboratory Press 08.02.2019
Cold Spring Harbor Laboratory
Edition:1.1
Subjects:
Biochemistry
Cancer
Metabolic flux
Metabolism
Metabolites
Multiple myeloma
NMR
metabolic flux
filtering
editing
ISSN:2692-8205, 2692-8205
Online Access:Get full text
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Summary:Tracer-based metabolism is becoming increasingly important to study metabolic mechanisms in cells. NMR offers several approaches to measure label incorporation in metabolites, including 13C and 1H-detected spectra. The latter are generally more sensitive but quantification depends on the proton carbon 1JCH coupling constant which varies significantly between different metabolites. It is therefore not possible to have one experiment optimised for all metabolites and quantification of 1H-edited spectra such as HSQCs requires precise knowledge of coupling constants. Increasing interest in tracer-based and metabolic flux analysis requires robust analyses with reasonably small acquisition times. Here we compare 13C-filtered and 13C-edited methods for quantification with a special focus towards application in real-time NMR of cancer cells under near-physiological conditions. We find an approach using a double-filter most suitable and sufficiently robust to reliably obtain 13C-incorporations from difference spectra. This is demonstrated for JJN3 multiple myeloma cells processing glucose over 24h.
Bibliography:SourceType-Working Papers-1
ObjectType-Working Paper/Pre-Print-1
content type line 50
ISSN:2692-8205
2692-8205
DOI:10.1101/544759