Hyperpolarized [ 15 N]nitrate as a potential long lived hyperpolarized contrast agent for MRI

Ayelet Gamliel, Sivaranjan Uppala, Gal Sapir, Talia Harris, Atara Nardi-Schreiber, David Shaul, Jacob Sosna, J. Moshe Gomori, Rachel Katz-Brull

Research output: Contribution to journalArticlepeer-review

Abstract

Reports on gadolinium deposits in the body and brains of adults and children who underwent contrast-enhanced MRI examinations warrant development of new, metal free, contrast agents for MRI. Nitrate is an abundant ion in mammalian biochemistry and sodium nitrate can be safely injected intravenously. We show that hyperpolarized [ 15 N]nitrate can potentially be used as an MR tracer. The 15 N site of hyperpolarized [ 15 N]nitrate showed a T 1 of more than 100 s in aqueous solutions, which was prolonged to more than 170 s below 20 °C. Capitalizing on this effect for polarization storage we obtained a visibility window of 9 min in blood. Conversion to [ 15 N]nitrite, the bioactive reduced form of nitrate, was not observed in human blood and human saliva in this time frame. Thus, [ 15 N]nitrate may serve as a long-lived hyperpolarized tracer for MR. Due to its ionic nature, the immediate applications appear to be perfusion and tissue retention imaging.

Original languageAmerican English
Pages (from-to)188-195
Number of pages8
JournalJOURNAL OF MAGNETIC RESONANCE
Volume299
DOIs
StatePublished - Feb 2019

Keywords

  • Contrast
  • Dissolution-dynamic nuclear polarization
  • Nitrate and nitrite ions
  • T relaxation
  • Tissue retention

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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