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Amino acid transport in established adult rat liver epithelial cell lines

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Abstract

The capacities of Na+-dependent transport of α-aminoisobutyrate, glutamine and glutamate in four established and three transformed rat liver epithelial cell lines were found to be considerably higher than those of isolated and cultured hepatocytes. At least for transport systems A and G− this seemed to be due to elevated values of V max , whereas the values for K m were quite comparable to those of hepatocytes. In contrast to hepatocytes, however, no significant hormonal stimulation of amino acid uptake could be detected in the cell lines.

Each normal cell line expressed a distinct pattern of transport capacities with respect to the three systems measured and this was not altered by chemical transformation of the lines. The individual patterns of the lines showed no similarity to presumptive patterns of subpopulations of liver parenchymal cells. In particular, there was no evidence for a direct relationship of one of the cell lines with a small subpopulation of parenchymal cells located adjacent to hepatic venules as revealed by additional measurements of glutamine synthetase, a marker enzyme for this particular subpopulation.

It is concluded that established rat liver epithelial cell lines express features characteristic of normal hepatocytes with respect to amino acid transport, but have developed a distinct phenotype adapted to a rapid, hormone-independent growth in vitro. Alteration of their phenotype by transformation is not coupled with a further increase in amino acid transport capacity.

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Abbreviations

AIB:

α-aminoisobutyrate

LPC:

liver parenchymal cells

N-Methyl-AIB:

N-methyl-α-aminoisobutyrate

TAT:

tyrosine aminotransferase

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  1. Naylor Dana Institute for Disease Prevention, American Health Foundation, Valhalla, New York

    Rolf Gebhardt & Gary M. Williams

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  1. Rolf Gebhardt
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  2. Gary M. Williams
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Gebhardt, R., Williams, G.M. Amino acid transport in established adult rat liver epithelial cell lines. Cell Biol Toxicol 2, 9–20 (1986). https://doi.org/10.1007/BF00117703

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