Abstract
Purpose. Common oligosaccharides of cellularglycoconjugates are ligands for more than one type of endogenous lectin.Overlapping specificities to β-galactosides of C-type lectins andgalectins can reduce target selectivity of carbohydrate-ligand-dependentdrug targeting. The purpose of this study is to explore distinct features ofligand presentation and structure for design of cluster glycosides todistinguish between asialoglycoprotein-specific (C-type) lectins andgalectins.
Methods. Extent of binding of labeled sugar receptors totwo types of matrix-immobilized (neo)glycoproteins and to cells wasevaluated in the absence and presence of competitive inhibitors. This panelcomprised synthetic mono-, bi-, and trivalent glycosides with two spacerlengths and galactose or lactose as ligand part.
Results. In contrast to C-type lectins of hepatocytes andmacrophages, bi- and trivalent glycosides do not yield a notable glycosidecluster effect for galectins-1 and -3. Also, theseCa2+-independent galactoside-binding proteins prefer to homein on lactose-bearing glycosides relative to galactose as ligand, whilespacer length requirements were rather similar.
Conclusions. Trivalent cluster glycosides with Gal/GalNAcas ligand markedly distinguish between C-type lectins and galectins.Undesired side reactivities to galectins for C-type lectin drug deliverywill thus be minimal.
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André, S., Frisch, B., Kaltner, H. et al. Lectin-Mediated Drug Targeting: Selection of Valency, Sugar Type (Gal/Lac), and Spacer Length for Cluster Glycosides as Parameters to Distinguish Ligand Binding to C-Type Asialoglycoprotein Receptors and Galectins. Pharm Res 17, 985–990 (2000). https://doi.org/10.1023/A:1007535506705
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DOI: https://doi.org/10.1023/A:1007535506705