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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging
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Direct enzyme-substrate affinity determination by real-time hyperpolarized (13)C-MRS.

L J Friesen-Waldner1, C N Wiens, T P Wade

  • 1Department of Medical Biophysics, Western University, London, Ontario, Canada.

Chemical Communications (Cambridge, England)
|September 26, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces a novel magnetic resonance spectroscopy method for real-time kinetic analysis of choline metabolism. It allows precise measurement of enzyme activity and substrate affinity with high sensitivity and speed.

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Area of Science:

  • Biochemistry
  • Medical Imaging
  • Metabolic Analysis

Background:

  • Choline metabolism plays a crucial role in various physiological and pathological processes.
  • Accurate kinetic analysis of metabolic enzymes is essential for understanding disease mechanisms and developing targeted therapies.

Purpose of the Study:

  • To develop and validate a specialized kinetic analysis technique using hyperpolarized (13)C-magnetic resonance spectroscopy (MRS) for real-time metabolic studies.
  • To determine key kinetic parameters of choline metabolism, including enzyme activity, affinity, and inhibition.

Main Methods:

  • Utilized real-time hyperpolarized [1,1,2,2-D4, 1-(13)C]choline (13)C-MRS for kinetic analysis.
  • Performed measurements within a clinical MRI scanner environment.
  • Achieved high temporal resolution (1 second) and sensitivity (detecting metabolite levels < 16 μM).

Main Results:

  • Successfully determined initial rates of choline oxidase activity.
  • Quantified enzyme-substrate affinity (Km) and identified potential inhibition.
  • Demonstrated the feasibility of in vivo kinetic analysis of choline metabolism with high temporal resolution.

Conclusions:

  • The developed specialized kinetic analysis of hyperpolarized (13)C-MRS provides a powerful tool for real-time metabolic enzyme characterization.
  • This technique offers potential for non-invasive assessment of metabolic function and drug effects in clinical settings.