Ligand anchored poly(propyleneimine) dendrimers for brain targeting: Comparative in vitro and in vivo assessment

The present investigation was aimed at developing various ligands-anchored dendrimers and comparing their brain targeting potential at one platform. Sialic acid (S), glucosamine (G) and concanavalin A (C) anchored poly(propyleneimine) (PPI) dendritic nanoconjugates were developed and evaluated for delivery of anti-cancer drug, paclitaxel (PTX) to the brain. MTT assay on U373MG human astrocytoma cells indicated IC50 values of 0.40, 0.65, 0.95, 2.00 and 3.50 μM for PTX loaded SPPI, GPPI, CPPI, PPI formulations, and free PTX, respectively. The in vivo pharmacokinetics and biodistribution studies in rats showed significantly higher accumulation of PTX in brain as compared to free PTX. The order of targeting potential of various ligands under investigation was found as sialic acid > glucosamine > concanavalin A. Thus, it can be concluded that sialic acid, glucosamine and Con A can be used as potential ligands to append PPI dendrimers for enhanced delivery of anticancer drugs to the brain for higher therapeutic outcome.

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