Poly(omega-pentadecalactone-co-butylene-co-succinate) nanoparticles as biodegradable carriers for camptothecin delivery

Biomaterials. 2009 Oct;30(29):5707-19. doi: 10.1016/j.biomaterials.2009.06.061. Epub 2009 Jul 25.

Abstract

In this study, we show that degradable particles of a hydrophobic polymer can effectively deliver drugs to tumors after i.v. administration. Free-standing nanoparticles with diameters of 100-300 nm were successfully fabricated from highly hydrophobic, biodegradable poly(omega-pentadecalactone-co-butylene-co-succinate) (PPBS) copolyesters. PPBS copolymers with various compositions (20-80 mol% PDL unit contents) were synthesized via copolymerization of omega-pentadecalactone (PDL), diethyl succinate (DES), and 1,4-butanediol (BD) using Candida antarctica lipase B (CALB) as the catalyst. Camptothecin (CPT, 12-22%) was loaded into PPBS nanoparticles with high encapsulation efficiency (up to 96%) using a modified oil-in-water single emulsion technique. The CPT-loaded nanoparticles had a zeta potential of about -10 mV. PPBS particles were non-toxic in cell culture. Upon encapsulation, the active lactone form of CPT was remarkably stabilized and no lactone-to-carboxylate structural conversion was observed for CPT-loaded PPBS nanoparticles incubated in both phosphate-buffered saline (PBS, pH=7.4) and DMEM medium for at least 24 h. In PBS at 37 degrees C, CPT-loaded PPBS nanoparticles showed a low burst CPT release (20-30%) within the first 24 h followed by a sustained, essentially complete, release of the remaining drug over the subsequent 40 days. Compared to free CPT, CPT-loaded PPBS nanoparticles showed a significant enhancement of cellular uptake, higher cytotoxicity against Lewis lung carcinoma and 9L cell lines in vitro, a longer circulation time, and substantially better antitumor efficacy in vivo. These results demonstrate the potential of PPBS nanoparticles as long-term stable and effective drug delivery systems in cancer therapy.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Absorbable Implants
  • Animals
  • Camptothecin / administration & dosage*
  • Camptothecin / chemistry
  • Camptothecin / pharmacokinetics*
  • Cell Line, Tumor
  • Delayed-Action Preparations / administration & dosage
  • Delayed-Action Preparations / chemical synthesis*
  • Drug Compounding / methods
  • Lung Neoplasms / drug therapy*
  • Lung Neoplasms / metabolism*
  • Lung Neoplasms / pathology
  • Materials Testing
  • Metabolic Clearance Rate
  • Mice
  • Mice, Inbred C57BL
  • Nanoparticles / chemistry*
  • Nanoparticles / therapeutic use
  • Nanoparticles / ultrastructure*
  • Organ Specificity
  • Particle Size
  • Polyesters / chemistry*
  • Tissue Distribution

Substances

  • Delayed-Action Preparations
  • Polyesters
  • poly(omega-pentadecalactone-co-butylene-co-succinate)
  • Camptothecin