Journal of Cell Science, Vol 107, Issue 4 813-825, Copyright © 1994 by Company of Biologists

JOURNAL ARTICLES

An improved polarized rat hepatoma hybrid cell line. Generation and comparison with its hepatoma relatives and hepatocytes in vivo

MR Shanks, D Cassio, O Lecoq and AL Hubbard
Department of Cell Biology and Anatomy, Johns Hopkins School of Medicine, Baltimore, Maryland 21205.

Studies of hepatocyte polarity, an important property of liver epithelial cells, have been hampered by the lack of valid in vitro models. We report here that a new polarized hepatoma-derived hybrid cell line, called WIF-B, has improved characteristics to those of its parent, WIF12-1. This latter line originated from the fusion of non-polarized rat hepatoma Fao cells with human fibroblasts (WI-38) and selection for a polarized phenotype. We generated the WIF-B line by growing WIF12-1 cells as unattached aggregates for three weeks and selecting for survivors. Karyotype analysis showed a broad chromosome pattern in the initial WIF-B population, but this pattern stabilized after a few passages. The growth and phenotypic properties of these cells were quite different from those of their polarized WIF12-1 parent. WIF-B cells attained a 4-fold higher maximal density in monolayer culture, survived at this density for > 5 days rather than 1 day, and exhibited two to three times more apical structures during this period (80 to 95%). We compared several parameters of liver differentiation in the WIF-B cells with those of a related hybrid clone, WIF12-E, which is extinguished for most liver-specific functions, and with the common hepatoma parent, Fao. By immunoblot analysis, the levels of expression of eight plasma membrane proteins were higher in the WIF-B cells than in either of the other two cell lines and ranged from 10 to 200% of those in vivo. Two plasma membrane proteins were not detected in WIF12-E cells. By immunofluorescence, the apical membrane proteins in WIF-B displayed different cellular localizations than in either of the other two cell lines. In WIF-B cells, apical proteins were confined to a plasma membrane region that we have identified as the apical domain by several criteria (Ihrke, G., Neufeld, E.D., Meads, T., Shanks, M.R., Cassio, D., Laurent, M., Schroer, T.A., Pagano, R. E. and Hubbard, A. L. J. Cell Biol., 123, 1761-1765). The same molecules were distributed over the entire plasma membrane of Fao and WIF12-E cells and also (for Fao cells) in intracellular punctate structures that did not colocalize with the majority of structures containing a secretory protein, albumin. Our results indicate that the WIF-B cells are more highly differentiated than any of their ancestors (Fao or WIF12-1 cells) and thus, are promising candidates for in vitro studies of hepatocyte polarity.
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