Rat hepatocytes, freshly isolated by a collagenase perfusion technique, bound [3H]asialo-orosomucoid in a sugar-specific and calcium-dependent manner as expected for the hepatic asialoglycoprotein receptor. At least 90% of the total cell surface-bound [3H]asialo-orosomucoid represented specific binding and could be removed by washing with EDTA. Freshly isolated cells had about 7 X lo4 surface r...

N-Linked biantennary, triantennary, and core fucosylated biantennary oligosaccharides were isolated from animal glycoproteins and derivatized at their reducing end with Boc-tyrosine. The terminal Gal residues were enzymatically removed and replaced with GalNAc. Tyrosinamide-oligosaccharides were radioiodinated and administered intravenously to mice. Pharmacokinetic and biodistribution studies r...

Two cDNA clones isolated from a HepG2 lambda gt11 library encode the classical asialoglycoprotein receptor, H1, as well as a homologous membrane glycoprotein, H2 (Spiess, M., and Lodish, H.F. (1985) Proc. Natl. Acad. Sci. U.S.A. 82, 6465-6469). To study the relationship of H2 to H1 and its possible role in receptor-mediated endocytosis of desialyated glycoproteins, we generated anti-peptide ant...

The asialoglycoprotein (ASGP) receptor is an abundant hepatocyte-specific receptor involved in receptor-mediated endocytosis. This receptor's abundance and function is decreased by chronic ethanol administration prior to the appearance of pathology such as necrosis or inflammation. Hence, this study aimed to determine if ASGP receptor function is required to protect against liver injury by util...

Lp(a) [lipoprotein (a)] is a highly atherogenic plasma lipoprotein assembled from low-density lipoprotein and the glycoprotein apolipoprotein (a). The rate of Lp(a) biosynthesis correlates significantly with plasma Lp(a) concentrations, whereas the fractional catabolic rate does not have much influence. So far, little is known about Lp(a) catabolism. To study the site and mode of Lp(a) cataboli...

Endogenous ligands have not, to date, been identified for the asialoglycoprotein receptor (ASGP-R), which is abundantly expressed by parenchymal cells in the liver of mammals. On the basis of the rapid clearance of BSA bearing multiple chemically coupled sialic acid (Sia) 2,6GalNAc 1,4GlcNAc 1,2Man tetrasaccharides (SiaGGnM-BSA) from the circulation, and the ability of the ASGP-R hepatic lectin...

We recently reported that the dissociation of internalized receptor-1261-asialo-orosomucoid (ASOR) complexes by isolated hepatocytes is a biphasic process; most complexes dissociate rapidly but 25-50% dissociate slowly (Oka, J. A., and Weigel, P. H. J. Biol. Chern. 258, 10253-10262). Cells were allowed to endocytose a pulse of surface-bound '''I-ASOR, and were washed and then incubated at 37 "C...

The human macrophage galactose lectin (MGL) is an endocytic type II transmembrane receptor expressed on immature monocyte-derived dendritic cells and activated macrophages plays a role in modulating the immune system response to infections cancer. MGL contains extracellular calcium-dependent (C-type) carbohydrate recognition domain (CRD) that specifically binds terminal N-acetylgalactosamine gl...

In the present study, an attempt was made to develop galactosylated albumin nanoparticles of Cimetidine for treatment of Acetaminophen induced hepatotoxicity. By developing the galactosylated nanoparticulated delivery of Cimetidine the required action of drug at the target site i.e at liver can be provided. The advantage of targeting helps to reduce the systemic side effects which may ...