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Serum is a rich source of ligands for the scavenger receptor of hepatic sinusoidal endothelial cells

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Abstract

The present study was prompted by findings in our laboratory showing that serum effectively inhibits scavenger receptor (SR)-mediated endocytosis in hepatic sinusoidal endothelial cells (SEC). Experiments with SEC in vitro showed that the presence of 20% human serum inhibited endocytosis of SR ligands, 125I-formaldehyde treated bovine serum albumin (FSA) and 125I-nidogen, by 30 and 50%, respectively, whereas pre-heated foetal bovine serum (10%) inhibited endocytosis of 125I-FSA by as much as 56%. Human, bovine and rat serum had similar inhibitory effect on endocytosis in SEC. Fractionation of foetal bovine and human serum on anion exchange chromatography demonstrated that the inhibitory principle co-purified with macromolecules of high negative charge. The serum fraction that most effectively inhibited SR-mediated endocytosis of 125I-FSA did not affect mannose receptor-mediated endocytosis of 125I-mannan to the same extent. Trap-labelled negatively charged serum fraction administered intravenously to rats was eliminated almost exclusively by liver, with a blood decay of 50% over the first 3 min after injection. Isolation of liver cells showed that the populations of Kupffer cells and SEC contained 39 and 61% of liver radioactivity 30 min after injection of trap-labelled negatively charged fractions prepared from pre-heated (‘complement inactivated’) foetal bovine sera. These findings suggest that the process of serum formation from native blood generates appreciable amounts of macromolecules that compete specifically with the SR for endocytosis in SEC. The inhibitory power of pre-heated serum is particularly great. For this reason pre-heated serum should be used with caution in studies of SR in SEC.

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Correspondence to Berit Hansen.

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Hansen, B., Melkko, J. & Smedsrød, B. Serum is a rich source of ligands for the scavenger receptor of hepatic sinusoidal endothelial cells. Mol Cell Biochem 229, 63–72 (2002). https://doi.org/10.1023/A:1017919800347

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