Paclitaxel-loaded poly(γ-glutamic acid)-poly(lactide) nanoparticles as a targeted drug delivery system against cultured HepG2 cells

Hsiang Fa Liang, Sung Ching Chen, Mei Chin Chen, Po Wei Lee, Chiung Tong Chen, Hsing Wen Sung

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72 Citations (Scopus)


The study was to develop paclitaxel-loaded formulations using a novel type of self-assembled nanoparticles that was composed of block copolymers synthesized from poly(γ-glutamic acid) and poly(lactide) via a simple coupling reaction. The nanoparticles (the NPs) were prepared with various feed weight ratios of paclitaxel to block copolymer (the P/BC ratio). The morphology of all prepared nanoparticles was spherical and the surfaces were smooth. Increasing the P/BC ratio significantly increased the drug loading content of the prepared nanoparticles, but remarkably reduced the drug loading efficiency. The release rate of paclitaxel from the NPs decreased significantly as the P/BC ratio increased. For the potential of targeting liver cancer cells, galactosamine was further conjugated on the prepared nanoparticles (the Gal-NPs) as a targeting moiety. It was found that the activity in inhibiting the growth of HepG2 cells (a liver cancer cell line) by the Gal-NPs was comparable to that of a clinically available paclitaxel formulation, while the NPs displayed a significantly less activity. This may be attributed to the fact that the Gal-NPs had a specific interaction with HepG2 cells via ligand-receptor recognition. Cells treated with distinct paclitaxel formulations resulted in arrest in the G2/M phase. The arrest of cells in the G2/M phase was highly suggestive of interference by paclitaxel with spindle formation and was consistent with the morphological findings presented herein. In conclusion, the active targeting nature of the Gal-NPs prepared in the study may be used as a potential drug delivery system for the targeted delivery to liver cancers.

Original languageEnglish
Pages (from-to)291-299
Number of pages9
JournalBioconjugate Chemistry
Issue number2
Publication statusPublished - 2006 Mar 1

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Bioengineering
  • Biomedical Engineering
  • Pharmacology
  • Pharmaceutical Science
  • Organic Chemistry

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