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Development and application of purified tissue dissociation enzyme mixtures for human hepatocyte isolation
Authors: Roberto Gramignoli, Michael L Green, Veysel Tahan, Kenneth Dorko, Kristen J Skvorak, Fabio Marongiu, Wenchen Zao, Raman Venkataramanan, Ewa C.S. Ellis, David Geller, Andrew G Breite, Francis E Dwulet, Robert C McCarthy, Stephen C Strom
Source: Cell Transplantation
Publisher: Cognizant Communication Corporation
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Abstract:
Human hepatocyte transplantation is gaining acceptance for the treatment of liver diseases. However, the reagents used to isolate hepatocytes from liver tissue are not standardized and show lot to lot variability in enzyme activity and endotoxin contamination. For clinical application, highly purified reagents are preferable to crude digest preparations. A purified tissue dissociating enzyme (TDE) preparation (CIzyme™ purified enzymes) was developed based on the enzyme compositions found in a superior lot of collagenase previously used by our group for human hepatocyte isolation. The performance of this enzyme preparation was compared to Collagenase type XI on 110 liver cases by assessing hepatocyte yield, viability, and 7 other functional assays that included plating efficiency, basal and induced CYP450 activities, phase II conjugation activity and ammonia metabolism. No statistically significant difference was observed between these TDEs when they were used to isolate hepatocytes from liver resections or organ donor tissue on 54 hepatocyte isolations with Type XI enzyme and 56 isolations using CIzyme™. These results show that a highly purified and defined TDE preparation can be formulated that provides excellent performance with respect to viability, yield and functional activity of the isolated cells. In addition to reproducible formulation, these purified enzyme products have only 2-3% of the endotoxin of crude enzyme preparations. These results show that purified enzymes such as CIzyme™ will be a safe and effective for the isolation of human hepatocytes for clinical transplants.Document Type:
DOI: http://dx.doi.org/10.3727/096368911X600939
Appeared or available online: November 11, 2011
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