Hepatic and extrahepatic clearance of circulating human lactoferrin: an experimental study in rat.

Abstract:

:Lactoferrin, unlabelled or 125I-labelled by 2 different methods, was given intravenously to rats. Blood, tissue and liver cell radioactivity was measured. Both of the radiolabelled preparations were eliminated by the liver, and some deposited extrahepatically. One preparation formed large aggregates--here 90% of the hepatic uptake occurred in the Kupffer cells. The other preparation, consisting mostly of protein monomers but also dimers/oligomers/microaggregates, was taken up by hepatocytes (63% of total liver uptake), liver endothelial cells (22%) and Kupffer cells (15%). On a per cell volume basis, lactoferrin uptake was much more efficient by nonparenchymal cells compared to hepatocytes, which explains why immunomorphological staining only revealed lactoferrin in the nonparenchymal liver cells. The study demonstrates that radio-iodination of lactoferrin can affect its properties and handling, which may be important regarding contradictory reports on hepatic lactoferrin uptake. We conclude that both hepatocytes and nonparenchymal liver cells are involved in the blood clearance of lactoferrin, probably to a great extent owing to nonspecific mechanisms. Extrahepatic deposition and exposure (for instance on vessel walls/glomeruli) suggests that lactoferrin can be available to circulating anti-lactoferrin autoantibodies in autoimmune disease.

journal_name

Eur J Haematol

authors

Peen E,Johansson A,Engquist M,Skogh T

doi

10.1111/j.1600-0609.1998.tb01078.x

subject

Has Abstract

pub_date

1998-09-01 00:00:00

pages

151-9

issue

3

eissn

0902-4441

issn

1600-0609

journal_volume

61

pub_type

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