Cell-surface receptors and transporters (nanoparticle delivery context)

Cell-surface receptors and transporters represent a broad category of membrane-bound proteins utilized as docking sites for ligand-functionalized nanoparticle delivery systems. These targets, such as the transferrin receptor and folate receptor, are frequently exploited because they are overexpressed in pathological tissues like solid tumors (Sahay et al., 2010, Nature Nanotechnology). When a nanoparticle's surface ligands bind to these receptors, they typically trigger receptor-mediated endocytosis, allowing the delivery vehicle to enter the cell and release its therapeutic payload (Kou et al., 2013, African Journal of Pharmacy and Pharmacology). This targeted approach aims to increase the local concentration of drugs at the disease site while minimizing systemic exposure and associated side effects (Bareford & Swaan, 2007, Advanced Drug Delivery Reviews). Beyond simple binding, these proteins facilitate the transport of large or polar molecules that cannot otherwise cross the lipid bilayer (Zhang et al., 2012, ACS Nano). The efficiency of this process is highly dependent on the affinity of the ligand and the density of the target receptor on the cell surface. However, the success of this strategy is often limited by the heterogeneity of receptor expression across patient populations and the challenge of achieving efficient endosomal escape once the vehicle is internalized. Furthermore, off-target accumulation in organs like the liver and spleen remains a significant hurdle for clinical translation of these targeted nanomedicines.

Other names

Cell-surface markers for nanoparticle targetingEndocytic receptorsMembrane transporters for drug deliveryTargeted delivery receptors

Receptor-mediated endocytosis and carrier-mediated transport facilitate the cellular internalization of nanoparticle-encapsulated therapeutic agents (Sahay et al., 2010, Nature Nanotechnology).