Abstract
Background: Hyperbranched polymers represent a new class of drug-delivery vehicle that can be used to prepare nanoparticles with uniform size distribution. Methods: In this study we prepared covalent conjugates between the photosensitizer chlorin(e6) and hyperbranched poly(ether-ester), HPEE. HPEE-ce6 nanoparticles were synthesized by carbodiimide-mediated reaction between HPEE and ce6, and characterized by ultraviolet-visible absorption spectroscopy (UV-Vis), and transmission electron microscopy (TEM). The uptake and phototoxicity of HPEE-ce6 nanoparticles towards human oral tongue cancer CAL-27 cells was detected by confocal laser scanning microscopy (CLSM) and MTT assay, respectively. Results: The absorption peak of HPEE-ce6 nanoparticles was red-shifted 12-nm compared with ce6, and TEM showed uniform nanoparticles with a diameter of 50-nm. HPEE-ce6 nanoparticles were taken up by CAL-27 cells after 4h incubation and localized in the cytoplasm. The MTT assay showed a significantly (P<0.05) higher phototoxicity compared to free ce6 after 12J/cm 2 of 660-nm laser illumination. Conclusions: This is the first time to our knowledge that hyperbranched polymers have been used in PDT drug delivery.
| Original language | English |
|---|---|
| Pages (from-to) | 76-82 |
| Number of pages | 7 |
| Journal | Photodiagnosis and Photodynamic Therapy |
| Volume | 9 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Mar 2012 |
| Externally published | Yes |
Keywords
- Chlorin(e6)
- Drug delivery system (DDS)
- Hyperbranched poly(ether-ester) (HPEE)
- Nanoparticles
- Photodynamic therapy (PDT)
- Transmission electron microscopy
ASJC Scopus subject areas
- Biophysics
- Oncology
- Dermatology
- Pharmacology (medical)
