RECONSTRUCTION OF LIVER-TISSUE IN-VITRO - GEOMETRY OF CHARACTERISTIC FLAT BED, HOLLOW-FIBER, AND SPOUTED BED BIOREACTORS WITH REFERENCE TO THE IN-VIVO LIVER

被引:39
作者
BADER, A
KNOP, E
FRUHAUF, N
CROME, O
BOKER, K
CHRISTIANS, U
OLDHAFER, K
RINGE, B
PICHLMAYR, R
SEWING, KF
机构
[1] HANNOVER MED SCH, ELEKTR MIKROSKOPIE & ZELLBIOL ABT, D-30625 HANNOVER, GERMANY
[2] HANNOVER MED SCH, GASTROENTEROL & HEPATOL ABT, D-30625 HANNOVER, GERMANY
[3] HANNOVER MED SCH, ABDOMINAL & TRANSPLANTAT CHIRURG KLIN, D-30625 HANNOVER, GERMANY
关键词
SANDWICH CULTURE; ULTRASTRUCTURE; CYCLOSPORINE; RAPAMYCIN; HEPATOCYTES; MEMBRANES; OXYGENATION;
D O I
10.1111/j.1525-1594.1995.tb02456.x
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
Bioreactors currently being developed for hybrid artificial livers vary greatly with respect to their microenvironment. The specific architecture modifies the relationship parenchymal and nonparenchymal cells have with the exchange surfaces of the bioreactor. Most designs are either based on hollow fiber, spouted bed, or flat bed devices. This diversity is contrasted by the uniform and unique organization of the in vivo liver. The liver cells are arranged as plates and both sinusoidal surfaces of the hepatocytes are enclosed within the matrix of the space of Disse. In this study we intended to define the in vivo liver tissue characteristics in a manner useful for an organotypical approach to hepatic tissue engineering. Transmission electron microscopy of an in vivo liver was utilized to describe these ratios. The ratios defined in this study are based on the constant hepatocellular expression of two sinusoidal surfaces. A relationship is established between the expression of the sinusoidal surfaces and their use as attachment and exchange surfaces inside a bioreactor. The presence of biliary surfaces and nonparenchymal cell surfaces is compared. The functional relevance of an in vivo like extracellular matrix geometry for oxidative biotransformation of primary hepatocytes in vitro was studied using the two model drugs cyclosporin and rapamycin. The generation of the hydroxylated cyclosporin metabolites AM 9 and AM 1 and four rapamycin metabolites was analyzed by high performance liquid chromatography (HPLC). It is shown that the cell-specific biotransformation rates at 1 week in culture in matrix overlayed hepatocytes was 5-10 times that of hepatocytes without matrix overlay. Bilaminar membrane (BLM) bioreactors were used to reconstruct extracellular matrix geometry, three-dimensional cell plates, and sinusoidal analogs in between cell plates.
引用
收藏
页码:941 / 950
页数:10
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