Preparation and characterization of a lovastatin-loaded protein-free nanostructured lipid carrier resembling high-density lipoprotein and evaluation of its targeting to foam cells

AAPS PharmSciTech. 2011 Dec;12(4):1200-8. doi: 10.1208/s12249-011-9668-0. Epub 2011 Sep 17.

Abstract

This study was designed to investigate whether a non-protein nanostructured lipid carrier (NLC) resembling high-density lipoprotein (HDL) could deliver a hydrophobic anti-atherogenic drug, lovastatin, to foam cells. Lovastatin-loaded NLC (LT-NLC) was prepared by a nanoprecipitation/solvent diffusion method. The LT-NLC-apoprotein (LT-NLC-apo) was prepared by incubating LT-NLC with native HDL. The physicochemical parameters of LT-NLC were characterized in terms of particle size, zeta potential, morphology, entrapment efficiency, and crystallization behavior. Targeting behavior and mechanism were demonstrated by the incubation of LT-NLC-apo with a RAW 264.7 macrophage-derived foam cell model in the presence or absence of very-low-density lipoprotein (VLDL) and lipase. The results showed that LT-NLC was solid spherical or oval in shape with an average diameter of 13.8 ± 2.2 nm, zeta potential of -29.3 ± 0.2 mV and entrapment efficiency of 96.2 ± 1.3%. Phagocytosis studies showed that uptake of LT-NLC-apo by macrophages was significantly lower than LT-NLC (p < 0.01), suggesting that LT-NLC-apo could possibly escape recognition from macrophages in vivo. The uptake was increased twofold when LT-NLC-apo was incubated with transfected foam cells containing VLDL and lipase. These results indicated that non-protein NLC resembling HDL could be a useful tool to deliver lipophilic anti-atherogenic drugs to foam cells, and that uptake could be enhanced by the VLDL receptor pathway.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Calorimetry, Differential Scanning
  • Chemistry, Pharmaceutical
  • Cholesterol Ester Transfer Proteins / genetics
  • Cholesterol Ester Transfer Proteins / metabolism
  • Drug Carriers*
  • Drug Compounding
  • Foam Cells / metabolism*
  • Humans
  • Hydrophobic and Hydrophilic Interactions
  • Hydroxymethylglutaryl-CoA Reductase Inhibitors / chemistry
  • Hydroxymethylglutaryl-CoA Reductase Inhibitors / metabolism*
  • Lipase / metabolism
  • Lipoproteins, HDL / chemistry*
  • Lipoproteins, HDL / toxicity
  • Lipoproteins, VLDL / metabolism
  • Lovastatin / chemistry
  • Lovastatin / metabolism*
  • Mice
  • Nanoparticles*
  • Nanotechnology*
  • Particle Size
  • Phagocytosis
  • Technology, Pharmaceutical / methods*
  • Transfection
  • U937 Cells

Substances

  • Cholesterol Ester Transfer Proteins
  • Drug Carriers
  • Hydroxymethylglutaryl-CoA Reductase Inhibitors
  • Lipoproteins, HDL
  • Lipoproteins, VLDL
  • Lovastatin
  • Lipase