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pubmed-article:3691673pubmed:abstractTextSpecific differentiated gene expression and the morphology of adult rat hepatocytes can be maintained for as long as 8 weeks in vitro only when they are cultured in the presence of biliary epithelial cells; when primary hepatocytes are cultured alone, they lose these functions within 2 to 3 days. We obtained evidence suggesting that contact between hepatocytes and biliary epithelial cells is necessary for maintaining hepatocyte functions. We examined whether junctional communication between and among hepatocytes and biliary epithelial cells is required for long-term maintenance of hepatocyte functions, using a dye-transfer method, in three co-cultures: (1) hepatocytes and biliary epithelial cells prepared from Sprague-Dawley rats; (2) hepatocytes from Sprague-Dawley rats and epithelial cells of the IAR 20 line, originally established from BDVI rats; and (3) hepatocytes from BDVI rats and IAR 20 epithelial cells. The established epithelial cell line (IAR 20) and early-passage cultures of biliary epithelial cells maintained hepatocyte-specific functions in culture for 40 and 70 days, respectively, but the latter induced more stable maintenance of albumin secretion. Hepatocytes cultured alone lost their characteristic morphology within 5 to 8 days, and almost no dye transfer was observed. In co-cultures, the capacity of biliary epithelial cells to communicate among themselves remained relatively high throughout the culture period, whereas hepatocytes showed almost no junctional communication at an early phase of culture and first began to communicate after 2 weeks, communication capacity increasing for at least the next 10 days of culture. The most notable finding was that there was no dye transfer between hepatocytes and biliary epithelial cells in any co-culture system. These results suggest that the maintenance of hepatocyte-specific functions requires intercellular contact but probably not gap-junctional communication between hepatocytes and biliary epithelial cells. This system is useful for studying heterotypic cell-cell interactions and the control of gene expression.lld:pubmed
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pubmed-article:3691673pubmed:articleTitleCell contact but not junctional communication (dye coupling) with biliary epithelial cells is required for hepatocytes to maintain differentiated functions.lld:pubmed
pubmed-article:3691673pubmed:affiliationInternational Agency for Research on Cancer, Lyon, France.lld:pubmed
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