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Artif Organs. 2008 Feb;32(2):116-26. Epub 2007 Nov 14.

Enhanced oxygen availability improves liver-specific functions of the AMC bioartificial liver.

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1
Department of Surgery (Surgical Laboratory), Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.

Abstract

Long-term culturing of primary porcine hepatocytes (PPH) inside the Academic Medical Center (AMC)-bioartificial liver is characterized by increased anaerobic glycolysis. Recommendations to increase oxygen availability were proposed in a previous numerical study and were experimentally evaluated in this study. Original bioreactors as well as new configuration bioreactors with 2.2-fold thinner nonwoven matrix and 2-fold more capillaries were loaded with PPHs and oxygenated with different gas oxygen pressures resulting in medium pO(2) (pO(2-med)) of either 135-150 mm Hg or 235-250 mm Hg. After 6 days culturing, new configuration bioreactors with pO(2-med )of 250 mm Hg showed significantly reduced anaerobic glycolysis, 60% higher liver-specific functions, and increased transcript levels of five liver-specific genes compared to the standard bioreactor cultures. Changed bioreactor configuration and increasing pO(2-med) contributed equally to these improvements. Histological examination demonstrated small differences in cell organization. In conclusion, higher metabolic stability and liver-specific functionality was achieved by enhanced oxygen availability based on a prior modeling concept.

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