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<http://onlinelibrary.wiley.com/doi/10.1002/lt.22200/abstract>
Original Article
Primary human hepatocytes on biodegradable poly(l-lactic acid) matrices: A
promising model for improving transplantation efficiency with tissue
engineering†
Eva Török1,†, Marc Lutgehetmann2,3,†, Jeanette Bierwolf1, Stefan
Melbeck1, Jochen Düllmann4, Bjoern Nashan1, Peter X. Ma5,6,7, Joerg M.
Pollok1,*,‡Article first published online: 28 JAN 2011
DOI: 10.1002/lt.22200
Copyright © 2011 American Association for the Study of Liver Diseases
Issue
Liver Transplantation
Volume 17, Issue 2, pages 104–114, February 2011
Abstract
Liver transplantation is an established treatment for acute and chronic
liver disease. However, because of the shortage of donor organs, it does
not fulfill the needs of all patients. Hepatocyte transplantation is
promising as an alternative method for the treatment of end-stage liver
disease and as bridging therapy until liver transplantation. Our group has
been working on the optimization of matrix-based hepatocyte
transplantation. In order to increase cell survival after transplantation,
freshly isolated human hepatocytes were seeded onto biodegradable
poly(l-lactic acid) (PLLA) polymer scaffolds and were cultured in a flow
bioreactor. PLLA discs were seeded with human hepatocytes and exposed to a
recirculated medium flow for 6 days. Human hepatocytes formed spheroidal
aggregates with a liver-like morphology and active metabolic function.
Phase contrast microscopy showed increasing numbers of spheroids of
increasing diameter during the culture period. Hematoxylin and eosin
histology showed viable and intact hepatocytes inside the spheroids.
Immunohistochemistry confirmed sustained hepatocyte function and a
preserved hepatocyte-specific cytoskeleton. Albumin, alpha-1-antitrypsin,
and urea assays showed continued production during the culture period.
Northern blot analysis demonstrated increasing albumin signals. Scanning
electron micrographs showed hepatocyte spheroids with relatively smooth
undulating surfaces and numerous microvilli. Transmission electron
micrographs revealed intact hepatocytes and junctional complexes with
coated pits and vesicles inside the spheroids. Therefore, we conclude that
primary human hepatocytes, precultured in a flow bioreactor on a PLLA
scaffold, reorganize to form morphologically intact liver neotissue, and
this might offer an optimized method for hepatocyte transplantation because
of the expected reduction of the initial cell loss, the high regenerative
potential in vivo, and the preformed functional integrity.
Liver Transpl 17:104–114, 2011. © 2011 AASLD. |
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