Sampling Hyperpolarized Molecules Utilizing a 1 Tesla Permanent Magnetic Field

Sci Rep. 2016 Sep 6:6:32846. doi: 10.1038/srep32846.

Abstract

Hyperpolarized magnetic resonance spectroscopy (HP MRS) using dynamic nuclear polarization (DNP) is a technique that has greatly enhanced the sensitivity of detecting (13)C nuclei. However, the HP MRS polarization decays in the liquid state according to the spin-lattice relaxation time (T1) of the nucleus. Sampling of the signal also destroys polarization, resulting in a limited temporal ability to observe biologically interesting reactions. In this study, we demonstrate that sampling hyperpolarized signals using a permanent magnet at 1 Tesla (1T) is a simple and cost-effective method to increase T1s without sacrificing signal-to-noise. Biologically-relevant information may be obtained with a permanent magnet using enzyme solutions and in whole cells. Of significance, our findings indicate that changes in pyruvate metabolism can also be quantified in a xenograft model at this field strength.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antibiotics, Antineoplastic / pharmacology
  • Humans
  • Lactic Acid / metabolism*
  • Magnetic Fields*
  • Magnetic Resonance Imaging / methods
  • Magnetic Resonance Spectroscopy / methods
  • Male
  • Mice, Inbred NOD
  • Mice, SCID
  • Prostatic Neoplasms / drug therapy
  • Prostatic Neoplasms / metabolism*
  • Prostatic Neoplasms / pathology
  • Pyruvic Acid / metabolism*
  • Sarcoma / drug therapy
  • Sarcoma / metabolism*
  • Sarcoma / pathology
  • Sirolimus / pharmacology
  • Tumor Cells, Cultured
  • Xenograft Model Antitumor Assays

Substances

  • Antibiotics, Antineoplastic
  • Lactic Acid
  • Pyruvic Acid
  • Sirolimus