• Open Access

A theoretical approach to zonation in a bioartificial liver

Authors

  • Adam J. Davidson,

    1. Centre for Regenerative Medicine, Department of Chemical Engineering, University of Bath, Bath BA2 7AY, UK; telephone: +44 1225 386349; fax: +44 1225 385713
    Search for more papers by this author
  • Marianne J. Ellis,

    1. Centre for Regenerative Medicine, Department of Chemical Engineering, University of Bath, Bath BA2 7AY, UK; telephone: +44 1225 386349; fax: +44 1225 385713
    Search for more papers by this author
  • Julian B. Chaudhuri

    Corresponding author
    1. Centre for Regenerative Medicine, Department of Chemical Engineering, University of Bath, Bath BA2 7AY, UK; telephone: +44 1225 386349; fax: +44 1225 385713
    • Centre for Regenerative Medicine, Department of Chemical Engineering, University of Bath, Bath BA2 7AY, UK; telephone: +44 1225 386349; fax: +44 1225 385713.
    Search for more papers by this author

Abstract

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.

Ancillary