Molecular MR Imaging of Liver Fibrosis: A Feasibility Study Using Rat and Mouse Models

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Molecular MR Imaging of Liver Fibrosis: A Feasibility Study Using Rat and Mouse Models

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Title: Molecular MR Imaging of Liver Fibrosis: A Feasibility Study Using Rat and Mouse Models
Author: Polasek, Miloslav; Fuchs, Bryan C.; Uppal, Ritika; Schühle, Daniel T.; Alford, Jamu K.; Loving, Galen S.; Yamada, Suguru; Wei, Lan; Lauwers, Gregory Y.; Guimaraes, Alexander Savio Ramos; Tanabe, Kenneth Kenji; Caravan, Peter D.

Note: Order does not necessarily reflect citation order of authors.

Citation: Polasek, Miloslav, Bryan C. Fuchs, Ritika Uppal, Daniel T. Schühle, Jamu K. Alford, Galen S. Loving, Suguru Yamada, et al. 2012. Molecular MR imaging of liver fibrosis: A feasibility study using rat and mouse models. Journal of Hepatology 57(3): 549–555.
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Abstract: Background & Aims: Liver biopsy, the current clinical gold standard for fibrosis assessment, is invasive and has sampling errors, and is not optimal for screening, monitoring, or clinical decision-making. Fibrosis is characterized by excessive accumulation of extracellular matrix proteins including type I collagen. We hypothesize that molecular magnetic resonance imaging (MRI) with a probe targeted to type I collagen could provide a direct and non-invasive method of fibrosis assessment. Methods: Liver fibrosis was induced in rats with diethylnitrosamine and in mice with carbon tetrachloride. Animals were imaged prior to and immediately following i.v. administration of either collagen-targeted probe EP-3533 or non-targeted control Gd-DTPA. Magnetic resonance (MR) signal washout characteristics were evaluated from T1 maps and T1-weighted images. Liver tissue was subjected to pathologic scoring of fibrosis and analyzed for gadolinium and hydroxyproline. Results: EP-3533-enhanced MR showed greater signal intensity on delayed imaging (normalized signal enhancement mice: control = 0.39 ± 0.04, fibrotic = 0.55 ± 0.03, p <0.01) and slower signal washout in the fibrotic liver compared to controls (liver t1/2 = 51.3 ± 3.6 vs. 42.0 ± 2.5 min, p <0.05 and 54.5 ± 1.9 vs. 44.1 ± 2.9 min, p <0.01 for fibrotic vs. controls in rat and mouse models, respectively). Gd-DTPA-enhanced MR could not distinguish fibrotic from control animals. EP-3533 gadolinium concentration in the liver showed strong positive correlations with hydroxyproline levels (r = 0.74 (rats), r = 0.77 (mice)) and with Ishak scoring (r = 0.84 (rats), r = 0.79 (mice)). Conclusions: Molecular MRI of liver fibrosis with a collagen-specific probe identifies fibrotic tissue in two rodent models of disease.
Published Version: doi:10.1016/j.jhep.2012.04.035
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