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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Vydané v:bioRxiv
Hlavní autori: Michelle Ac Reed, Roberts, Jennie, Gierth, Peter, Kupce, Eriks, Guenther, Ulrich L
Médium: Paper
Jazyk:English
Vydavateľské údaje: Cold Spring Harbor Cold Spring Harbor Laboratory Press 08.02.2019
Cold Spring Harbor Laboratory
Vydanie:1.1
Predmet:
Biochemistry
Cancer
Metabolic flux
Metabolism
Metabolites
Multiple myeloma
NMR
metabolic flux
filtering
editing
ISSN:2692-8205, 2692-8205
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Abstract 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.
AbstractList 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.
Author Gierth, Peter
Michelle Ac Reed
Roberts, Jennie
Guenther, Ulrich L
Kupce, Eriks
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Keywords NMR
metabolic flux
filtering
editing
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Snippet Tracer-based metabolism is becoming increasingly important to study metabolic mechanisms in cells. NMR offers several approaches to measure label incorporation...
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SubjectTerms Biochemistry
Cancer
Metabolic flux
Metabolism
Metabolites
Multiple myeloma
Title NMR Methods for Quantitative Isotopomer Rates in Real-Time Metabolism of Cells
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