Photodynamic therapy (PDT) is considered an innovative and attractive modality to treat ovarian cancer. In the present study, a biodegradable polymer poly (ethylene glycol) (PEG)-poly (lactic acid)(PLA)-folate (FA-PEG-PLA) was prepared in order to synthesize an active-targeting, water-soluble and pharmacomodulated photosensitizer nanocarrier. Drug-loading content, encapsulation efficiency, in vitro and in vivo release were characterized, in which hypocrellin B (HB)/FA-PEG-PLA micelles had a high encapsulation efficiency and much slower control release for drugs compared to free drugs (P < .05). To evaluate the targeting ability of the HB/FA-PEG-PLA micelles, a cellular uptake study in vitro was carried out, which showed significantly enhanced uptake of HB/FA-PEG-PLA micelles in SKOV3 (FR+) compared to A2780 cancer cells (FR-). The enhanced uptake of HB/FA-PEG-PLA micelles to cancer cells resulted in a more effective post-PDT killing of SKOV3 cells compared to plain micelles and free drugs. Binding and uptake of HB/FA-PEG-PLA micelles by SKOV3 cells were also observed in vivo after ip injection of folate-targeted micelles in tumor-bearing ascitic ovarian cancer animals. Drug levels in ascitic tumor tissues were increased 20-fold (P < .001), which underscored the effect of a regional therapy approach with folate targeting. Furthermore, the HB-loaded micelles were mainly distributed in kidney and liver (the main clearance organs) in biodistribution. These results showed that our newly developed PDT photosensitizer HB/FA-PEG-PLA micelles have a high drug-loading capacity, good biocompatibility, controlled drug release, and enhanced targeting and antitumor effect, which is a potential approach to future targeting ovarian cancer therapy.
Keywords: folate; intraperitoneal; nanoparticle; ovarian cancer; tumor targeting.
© 2018 The Authors. Cancer Science published by John Wiley & Sons Australia, Ltd on behalf of Japanese Cancer Association.