• cellular uptake;
  • 2-hydroxypropyl-β-cyclodextrin;
  • paclitaxel;
  • solid lipid nanoparticle;
  • verapamil


Objectives  This study aimed to evaluate the potential of solid lipid nanoparticles (SLNs) of paclitaxel (PTX) modified with a 2-hydroxypropyl-β-cyclodextrin system to enhance cellular accumulation of PTX into p-glycoprotein (p-gp)-expressing cells.

Methods  The PTX-loaded-SLNs consisted of lipid (stearic acid) and surfactants (lecithin and poloxamer 188) and were then modified with 2-hydroxypropyl-β-cyclodextrin by a sonication method.

Key findings  In terms of cytotoxicity, PTX-loaded SLNs modified with 2-hydroxypropyl-β-cyclodextrin showed higher cytotoxicity than other formulations. In particular, the cellular uptake of PTX from PTX-loaded SLNs modified with 2-hydroxypropyl-β-cyclodextrin was about 5.8- and 1.5-fold higher than that from PTX solution and unmodified PTX-loaded SLNs in MCF-7/ADR cells, respectively. After a 4-h incubation, clear fluorescence images inside cells were observed over time. When PTX-loaded SLNs modified with 2-hydroxypropyl-β-cyclodextrin were incubated with MCF-7/ADR cells for 4 h, cellular uptake of PTX increased 1.7-fold versus that of PTX in the presence of verapamil.

Conclusions  These results suggest that optimized SLNs modified with 2-hydroxypropyl-β-cyclodextrin may have potential as an oral drug delivery system for PTX.