Pharmacokinetics and brain uptake of lactoferrin in rats.
Lactoferrin (Lf) is an iron-binding glycoprotein belonging to the transferrin (Tf) family. Lf was reported to cross the blood brain barrier (BBB) via receptor-mediated transcytosis in an in vitro model of the BBB. In the present study, we compared the in vivo brain uptake of Lf with that of OX26, an anti-Tf receptor antibody, and Tf. These three proteins were radiolabeled with 125I and administered to rats by i.v. injection. We found that Lf was more rapidly eliminated from the blood compared with OX26 and Tf (The half-life of Lf was approximately 8 and 6 times shorter than that of OX26 and Tf, respectively; the area under the blood concentration-time curve of Lf was approximately 15 and 17 times smaller than that of OX26 and Tf, respectively), and mainly accumulated in the liver, spleen, and kidney. Markedly high brain uptake was observed for Lf relative to Tf and OX26. Lf might be useful as a ligand for facilitating drug delivery into the brain.
Ji
Bin
B
Brain Imaging Project, National Institute of Radiological Sciences, Inage-ku, Chiba-shi, 263-8555, Japan.
Maeda
Jun
J
Higuchi
Makoto
M
Inoue
Kaori
K
Akita
Hidetaka
H
Harashima
Hideyoshi
H
Suhara
Tetsuya
T
D000818:Animals; D000911:Antibodies, Monoclonal / Q000493:pharmacokinetics; D019540:Area Under Curve; D001692:Biological Transport; D001812:Blood-Brain Barrier / Q000187:drug effects / Q000378:metabolism*; D001921:Brain / Q000187:drug effects / Q000378:metabolism*; D007275:Injections, Intravenous; D007457:Iodine Radioisotopes / Q000493:pharmacokinetics; D007781:Lactoferrin / Q000493:pharmacokinetics*; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D011990:Receptors, Transferrin / Q000276:immunology; D014168:Transferrin / Q000493:pharmacokinetics
D000911:Antibodies, Monoclonal; D007457:Iodine Radioisotopes; D011990:Receptors, Transferrin; D014168:Transferrin; D007781:Lactoferrin