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. 1987 May 1;243(3):715–722. doi: 10.1042/bj2430715

The interaction in vivo of transferrin and asialotransferrin with liver cells.

T J van Berkel 1, C J Dekker 1, J K Kruijt 1, H G van Eijk 1
PMCID: PMC1147917  PMID: 2444207

Abstract

Rat transferrin or asialotransferrin doubly radiolabelled with 59Fe and 125I was injected into rats. A determination of extrahepatic and hepatic uptake indicated that asialotransferrin delivers a higher fraction of the injected 59Fe to the liver than does transferrin. In order to determine in vivo the intrahepatic recognition sites for transferrin and asialotransferrin, the liver was subfractionated into parenchymal, endothelial and Kupffer cells by a low-temperature cell isolation procedure. High-affinity recognition of transferrin (competed for by an excess of unlabelled transferrin) is exerted by parenchymal cells as well as endothelial and Kupffer cells with a 10-fold higher association (expressed per mg of cell protein) to the latter cell types. In all three cell types iron delivery occurs, as concluded from the increase in cellular 59Fe/125I ratio at prolonged circulation times of transferrin. It can be calculated that parenchymal cells are responsible for 50-60% of the interaction of transferrin with the liver, 20-30% is associated with endothelial cells and about 20% with Kupffer cells. For asialotransferrin a higher fraction of the injected dose becomes associated with parenchymal cells as well as with endothelial and Kupffer cells. Competition experiments in vivo with various sugars indicated that the increased interaction of asialotransferrin with parenchymal cells is specifically inhibited by N-acetylgalactosamine whereas mannan specifically inhibits the increased interaction of asialotransferrin with endothelial and Kupffer cells. Recognition of asialotransferrin by galactose receptors from parenchymal cells or mannose receptors from endothelial and Kupffer cells is coupled to active 59Fe delivery to the cells. It is concluded that, as well as parenchymal cells, liver endothelial and Kupffer cells are also quantitatively important intrahepatic sites for transferrin and asialotransferrin metabolism, an interaction exerted by multiple recognition sites on the various cell types.

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Selected References

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