학술논문
Efficient Liver Targeting by Polyvalent Display of a Compact Ligand for the Asialoglycoprotein Receptor.
Document Type
Abstract
Author
Sanhueza, Carlos A.; Baksh, Michael M.; Thuma, Benjamin; Roy, Marc D.; Dutta, Sanjay; Préville, Cathy; Chrunyk, Boris A.; Beaumont, Kevin; Dullea, Robert; Ammirati, Mark; Liu, Shenping; Gebhard, David; Finley, James E.; Salatto, Christopher T.; King-Ahmad, Amanda; Stock, Ingrid; Atkinson, Karen; Reidich, Benjamin; Lin, Wen; Kumar, Rajesh
Source
Subject
*LIGANDS (Chemistry)
*MULTIVALENT molecules
*ASIALOGLYCOPROTEIN receptors
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Language
ISSN
0002-7863
Abstract
A compact and stable bicyclic bridged ketal was developed as a ligand for the asialoglycoprotein receptor (ASGPR). This compound showed excellent ligand efficiency, and the molecular details of binding were revealed by the first X-ray crystal structures of ligand-bound ASGPR. This analogue was used to make potent di- and trivalent binders of ASGPR. Extensive characterization of the function of these compounds showed rapid ASGPR-dependent cellular uptake in vitro and high levels of liver/plasma selectivity in vivo. Assessment of the biodistribution in rodents of a prototypical Alexa647-labeled trivalent conjugate showed selective hepatocyte targeting with no detectable distribution in nonparenchymal cells. This molecule also exhibited increased ASGPR-directed hepatocellular uptake and prolonged retention compared to a similar GalNAc derived trimer conjugate. Selective release in the liver of a passively permeable small-molecule cargo was achieved by retro-Diels-Alder cleavage of an oxanorbornadiene linkage, presumably upon encountering intracellular thiol. Therefore, the multicomponent construct described here represents a highly efficient delivery vehicle to hepatocytes. [ABSTRACT FROM AUTHOR]