title: Influence of Indocyanine Green on Hepatic Gd-EOB-DTPA Uptake: A Proof-of-Concept Study in Mice.
abstract: The aim of this study was to explore the influence of indocyanine green (ICG) on hepatic uptake of gadolinium ethoxybenzyldiethylenetriaminepenta-acetic acid (Gd-EOB-DTPA).
  
  
  
  Groups of 6 female C57BL6 mice were injected with 5 mg/kg ICG, 20 mg/kg ICG, or phosphate-buffered saline (control group) 10 minutes before the injection of Gd-EOB-DTPA; identical 3-dimensional gradient echo T1-weighted images were subsequently obtained to create time-intensity curves and to measure the peak contrast ratios (CRs) of liver parenchyma. We studied both hypothermic and normothermic mice. Peak CRs for all experimental conditions were evaluated, and among-group differences were assessed using 2-way factorial analysis of variance with Bonferroni post hoc testing.
  
  
  
  In hypothermic mice, the time-intensity curves of the 3 groups gradually increased from 5 to 30 minutes and almost plateaued after 30 minutes. The peak CR decreased as the amount of injected ICG increased (control group, 5 mg/kg ICG, 20 mg/kg ICG: 1.66 ± 0.09, 1.37 ± 0.18, 1.25 ± 0.24, respectively). In normothermic animals, the time-intensity curves of the control and ICG 5 mg/kg groups peaked 10 to 15 minutes after injection, the peak CRs were very similar (control group, 5 mg/kg ICG: 2.01 ± 0.16, 1.95 ± 0.14, respectively), and the intensities thereof then gradually fell until 60 minutes. Compared with these groups, the ICG 20 mg/kg group exhibited lower peak CR (1.48 ± 0.14) and a weaker decrease in intensity to 60 minutes. Both the amount of ICG injected (P < 0.001) and the experimental temperature (P < 0.001) significantly affected the measurements.
  
  
  
  Indocyanine green inhibits the hepatic uptake of Gd-EOB-DTPA and affects the signal intensity upon Gd-EOB-DTPA-enhanced magnetic resonance imaging. Such inhibition was more obvious in hypothermic mice.
authors.affiliation: From the *Department of Radiology, Institute of Medical Science, University of Tokyo; †Division of Advanced Medicine Promotion, The Advanced Clinical Research Center, Institute of Medical Science, University of Tokyo, Tokyo; ‡Department of Diagnostic Radiology, Kitasato University School of Medicine, Sagamihara, Kanagawa; and §Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Akai
authors.forename: Koichiro
authors.initials: K
authors.lastname: Yasaka
authors.forename: Masanori
authors.initials: M
authors.lastname: Nojima
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Inoue
authors.forename: Kuni
authors.initials: K
authors.lastname: Ohtomo
authors.forename: Shigeru
authors.initials: S
authors.lastname: Kiryu
mesh_terms: D000818:Animals; D003287:Contrast Media / Q000493:pharmacokinetics*; D005260:Female; D019786:Gadolinium DTPA / Q000493:pharmacokinetics*; D006801:Humans; D007208:Indocyanine Green / Q000493:pharmacokinetics*; D008099:Liver / Q000378:metabolism*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D051379:Mice; D008810:Mice, Inbred C57BL; D023421:Models, Animal
chemical_list: D003287:Contrast Media; C073590:gadolinium ethoxybenzyl DTPA; D007208:Indocyanine Green; D019786:Gadolinium DTPA