Abstract
Pig liver is a possible source of hepatocytes for extracorporeal bio-artificial liver devices. In order to evaluate recovered hepatocyte function following enzymatic isolation, we developed a cytochemical method that is based on the capacity of hepatocytes to sequester the anthracycline antitumour drug doxorubicin within intracellular acidic compartments. Doxorubicin is a naturally fluorescent molecule. Thus, the process of drug concentration within hepatocytes can be visualized in living conditions by fluorescence microscopy. Porcine hepatocytes harvested from heart-beating donors were grown either as isolated cell suspensions or as tissue monolayers. Immediately after isolation and at fixed culture times, cells were incubated with 0.1 mM doxorubicin in Hanks' balanced salt solution for 10 min at 37 °C in 5% CO2-humidified atmosphere and observed by fluorescence microscopy. Parallel electron microscopy was performed to compare fluorescence data with general cell morphology. To monitor lysosomal acidification capacity, the fluorescent pH-sensitive vital dye LysoSensor-Blue was used. Doxorubicin fluorescence showed different patterns of nuclear and cytoplasmic staining, according to the time allowed for cell recovery and the culture method. In particular, cytoplasmic fluorescence changed from a diffuse staining, that could be observed after cell isolation and in hepatocyte suspensions, to a punctate perinuclear and pericanalicular fluorescence detectable in fully recovered hepatocyte monolayers. This study indicates that the ‘doxorubicin-fluorescence test’ may be considered a simple and rapid procedure for assessing hepatocyte functional condition. It may provide valuable and ‘real time’ guidelines for judging the correct way these cells are to be collected, preserved and utilized for clinical purposes.
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Crivellato, E., Donini, A., Baccarani, U. et al. Efficiency of Doxorubicin Handling by Isolated Hepatocytes is a Valuable Indicator for Restored Cell Function. Histochem J 32, 535–543 (2000). https://doi.org/10.1023/A:1004198127027
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DOI: https://doi.org/10.1023/A:1004198127027