A Comprehensive Physicochemical, In Vitro and Molecular Characterization of Letrozole Incorporated Chitosan-Lipid Nanocomplex.

PURPOSE

The aim of this study is to show a new mesomicroscopic insight into Letrozole (LTZ) loaded nanocomplexes and their ex vivo characteristics as a drug delivery system.

METHODS

The LTZ loaded hybrid chitosan-based carrier was fabricated using a modified ionic crosslinking technique and characterized in more detail. To understand the mechanism of LTZ action encapsulated in the hybrid polymer-lipid carrier, all-atom molecular dynamics simulations were also used.

RESULTS

The physicochemical properties of the carrier demonstrated the uniform morphology, but different drug loading ratios. In vitro cytotoxic activity of the optimized carrier demonstrated IC of 67.85 ± 0.55 nM against breast cancer cell line. The ex vivo study showed the positive effect of nanocomplex on LTZ permeability 7-10 fold greater than the free drug. The molecular dynamic study also confirmed the prsence of hydrophobic peak of lipids at a distance of 5 Å from the center of mass of LTZ which proved drug entrapment in the core of nanocomplex.

CONCLUSIONS

The hybrid nanoparticle increased the cytotoxicity and tissue permeability of LTZ for oral delivery. This study also confirmed the atomic mesostructures and interaction of LTZ in the core of hybrid polymer-lipid nanoparticles.