Summary
The specific performance of the adult hepatic parenchymal cell is maintained and controlled by factors deriving from the stromal bed; the chemical nature of these factors is unknown. This study aimed to develop a serum-free hierarchical hepatocyte-nonparenchymal (stromal) cell coculture system. Hepatic stromal cells proliferated on crosslinked collagen in serum-free medium with epidermal growth factor, basic fibroblast growth factor, and hepatocyte-conditioned medium; cell type composition changed during the 2-wk culture period. During the first wk, the culture consisted of proliferating sinusoidal endothelial cells with well-preserved sieve plates, proliferating hepatic stellate cells, and partially activated Kupffer cells. The number of endothelial cells declined thereafter; stellate cells and Kupffer cells became the prominent cell types after 8 d. Hepatocytes were seeded onto stromal cells precultured for 4–14 d; they adhered to stellate and Kupffer cells, but spared the islands of endothelial cells. Stellate cells spread out on top of the hepatocytes; Kupffer cell extensions established multiple contacts to hepatocytes and stellate cells. Hepatocyte viability was maintained by coculture; the positive influence of stromal cell signals on hepatocyte differentiation became evident after 48 h; a strong improvement of cell responsiveness toward hormones could be observed in cocultured hepatocytes. Hierarchial hepatocyte coculture enhanced the glucagon-dependent increases in phosphoenolpyruvate carboxykinase activity and messenger ribonucleic acid (mRNA) content three- and twofold, respectively; glucagon-activated urea production was elevated twofold. Coculturing also stimulated glycogen deposition; basal synthesis was increased by 30% and the responsiveness toward insulin and glucose was elevated by 100 and 55%, respectively. The insulin-dependent rise in the glucokinase mRNA content was increased twofold in cocultured hepatocytes. It can be concluded that long-term signals from stromal cells maintain hepatocyte differentiation. This coculture model should, therefore, provide the technical basis for the investigation of stroma-derived differentiation factors.
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Ries, K., Krause, P., Solsbacher, M. et al. Elevated expression of hormone-regulated rat hepatocyte functions in a new serum-free hepatocyte-stromal cell coculture model. In Vitro Cell.Dev.Biol.-Animal 36, 502–512 (2000). https://doi.org/10.1290/1071-2690(2000)036<0502:EEOHRR>2.0.CO;2
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DOI: https://doi.org/10.1290/1071-2690(2000)036<0502:EEOHRR>2.0.CO;2