Effects of acute-liver-failure-plasma exposure on hepatic functionality of HepaRG-AMC-Bioartificial Liver
Article first published online: 7 FEB 2013
© 2012 John Wiley & Sons A/S
Volume 33, Issue 4, pages 516–524, April 2013
How to Cite
Liver Int. 2013: 33: 516–524
- Issue published online: 12 MAR 2013
- Article first published online: 7 FEB 2013
- Accepted manuscript online: 12 DEC 2012 06:05AM EST
- Manuscript Accepted: 5 DEC 2012
- Manuscript Received: 4 JUL 2012
- express their gratitude to the Subsidy Regulation Knowledge Exploitation
- Life Sciences Center Amsterdam validation fund
- Hep-Art Medical Devices B.V.
- fulminant hepatic failure;
- liver assist device;
- liver support;
Background & Aims
The AMC-bioartificial liver loaded with the human hepatoma cell line HepaRG as biocomponent (HepaRG-AMC-BAL) has recently proven efficacious in rats with acute liver failure (ALF). However, its efficacy may be affected by cytotoxic components of ALF plasma during treatment. In this study, we investigated the effects of ALF-plasma on the HepaRG-AMC-BAL.
HepaRG-AMC-BALs were connected to the blood circulation of rats with total liver ischaemia, either during the first 5 h after induction of ischaemia (mild ALF group), or during the following 10 h (severe ALF group). After disconnection, the BALs were assessed for cell leakage, gene transcript levels, ammonia elimination, urea production, cytochrome P450 3A4 activity, apolipoprotein A 1 production, glucose and amino acid metabolism.
Cell leakage increased 2.5-fold in the severe ALF group, but remained limited in all groups. Hepatic gene transcript levels decreased (max 40-fold) or remained stable. In contrast, hepatic functions increased slightly or remained stable. Particularly, urea production increased 1.5-fold, with a concurrent increase in arginase 2 transcription and arginine consumption, with a trend towards reduced conversion of ammonia into urea. The amino acid consumption increased, however, the net glucose consumption remained stable.
The HepaRG-AMC-BAL retains functionality after both mild and severe exposure to ALF plasma, but urea production may be increasingly derived from arginase 2 activity instead of urea cycle activity. Nevertheless, the increase in cell leakage and decrease in various hepatic transcript levels suggest that a decrease in hepatic functionality may follow upon extended exposure to ALF plasma.