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Combining hyperpolarized 13 C MRI with a liver‐specific gadolinium contrast agent for selective assessment of hepatocyte metabolism
Author(s) -
Ohliger Michael A.,
von Morze Cornelius,
MarcoRius Irene,
Gordon Jeremy,
Larson Peder E. Z.,
Bok Robert,
Chen Hsinyu,
Kurhanewicz John,
Vigneron Daniel
Publication year - 2017
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.26296
Subject(s) - gadolinium , magnetic resonance imaging , mri contrast agent , alanine , hepatocyte , chemistry , nuclear magnetic resonance , nuclear medicine , medicine , radiology , biochemistry , amino acid , in vitro , physics , organic chemistry
Purpose Hyperpolarized 13 C MRI is a powerful tool for studying metabolism, but can lack tissue specificity. Gadoxetate is a gadolinium‐based MRI contrast agent that is selectively taken into hepatocytes. The goal of this project was to investigate whether gadoxetate can be used to selectively suppress the hyperpolarized signal arising from hepatocytes, which could in future studies be applied to generate specificity for signal from abnormal cell types. Methods Baseline gadoxetate uptake kinetics were measured using T 1 ‐weighted contrast enhanced imaging. Relaxivity of gadoxetate was measured for [1‐ 13 C]pyruvate, [1‐ 13 C]lactate, and [1‐ 13 C]alanine. Four healthy rats were imaged with hyperpolarized [1‐ 13 C]pyruvate using a three‐dimensional (3D) MRSI sequence prior to and 15 min following administration of gadoxetate. The lactate:pyruvate ratio and alanine:pyruvate ratios were measured in liver and kidney. Results Overall, the hyperpolarized signal decreased approximately 60% as a result of pre‐injection of gadoxetate. In liver, the lactate:pyruvate and alanine:pyruvate ratios decreased 42% and 78%, respectively ( P < 0.05) following gadoxetate administration. In kidneys, these ratios did not change significantly. Relaxivity of gadoxetate for [1‐ 13 C]alanine was 12.6 times higher than relaxivity of gadoxetate for [1‐ 13 C]pyruvate, explaining the greater selective relaxation effect on alanine. Conclusions The liver‐specific gadolinium contrast‐agent gadoxetate can selectively suppress normal hepatocyte contributions to hyperpolarized 13 C MRI signals. Magn Reson Med 77:2356–2363, 2017. © 2016 International Society for Magnetic Resonance in Medicine