A theoretical approach to zonation in a bioartificial liver
Article first published online: 9 SEP 2011
Copyright © 2011 Wiley Periodicals, Inc.
Biotechnology and Bioengineering
Volume 109, Issue 1, pages 234–243, January 2012
How to Cite
Davidson, A. J., Ellis, M. J. and Chaudhuri, J. B. (2012), A theoretical approach to zonation in a bioartificial liver. Biotechnol. Bioeng., 109: 234–243. doi: 10.1002/bit.23279
- Issue published online: 17 NOV 2011
- Article first published online: 9 SEP 2011
- Accepted manuscript online: 1 AUG 2011 07:15AM EST
- Manuscript Accepted: 12 JUL 2011
- Manuscript Revised: 11 JUL 2011
- Manuscript Received: 8 APR 2011
- bioartifical liver;
Bioartificial livers have yet to gain clinical acceptance. In a previous study, a theoretical model was utilized to create operating region charts that graphically illustrated viable bioartificial liver configurations. On this basis a rationale for the choice of operating and design parameters for the device was created. The concept is extended here to include aspects of liver zonation for further design optimization. In vivo, liver cells display heterogeneity with respect to metabolic activity according to their position in the liver lobule. It is thought that oxygen tension is a primary modulator of this heterogeneity and on this assumption a theoretical model to describe the metabolic zonation within an in vitro bioartificial liver device has been adopted. The distribution of the metabolic zones under varying design and operating parameters is examined. In addition, plasma flow rates are calculated that give rise to an equal distribution of the metabolic zones. The results show that when a clinically relevant number of cells are contained in the BAL (10 billion), it is possible to constrain each of the three metabolic zones to approximately one-third of the cell volume. This is the case for a number of different bioreactor designs. These considerations allow bioartificial liver design to be optimized. Biotechnol. Bioeng. 2012;109: 234–243. © 2011 Wiley Periodicals, Inc.