Intermittent ischemia enhances the uptake of indocyanine green to livers subject to ischemia and reperfusion

Mathilde Steenks, Jeroen Peters, Willem Rademacher, Vincent Nieuwenhuijs, Robert Padbury, Gregory Barritt

    Research output: Contribution to journalArticle

    Abstract

    Background and Aim: Intermittent ischemia is known to promote post perfusion bile flow, and hence recovery of liver function following ischemia reperfusion of the liver. However, the mechanisms involved are not well understood. The aim of this study was to identify the step(s) in the bile acid transport pathway altered by intermittent ischemia. Methods: Arat model of segmental hepatic ischemia in which the bilateral median and left lateral lobes were made ischemic by clamping the blood vessels was used. Indocyanine green (ICG), infrared spectroscopy, and compartmental kinetic analysis, were used to indirectly monitor the movement of bile acids across hepatocytes in situ. Rates of bile flow were measured gravimetrically. Results: In control livers (not subjected to ischemia), the movement of ICG from the blood to bile fluid could be described by a three compartment model comprising the blood, a rapidly-exchangeable compartment, and the hepatocyte cytoplasmic space. In livers subjected to continuous clamping, the rates of ICG uptake to the liver, and outflow from the liver, were greatly reduced compared with those in control livers. Intermittent clamping (three episodes of 15 min clamping) compared with continuous clamping substantially increased the rate of ICG uptake from the blood but had less effect on the rate of ICG outflow from hepatocytes. Conclusions: It is concluded that intermittent ischemia promotes post reperfusion bile flow in the early phase of ischemia reperfusion injury principally by enhancing the movement of bile acids from the blood to hepatocytes.

    Original languageEnglish
    Pages (from-to)701-707
    Number of pages7
    JournalJournal of Gastroenterology and Hepatology
    Volume32
    Issue number3
    Early online date2017
    DOIs
    Publication statusPublished - 1 Mar 2017

    Keywords

    • bile flow
    • indocyanine green
    • infrared spectroscopy
    • intermittent ischemia
    • ischemia reperfusion injury
    • liver
    • rat

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