High drug loading pH-sensitive pullulan-DOX conjugate nanoparticles for hepatic targeting

Area of Science:

• Biomaterials Science
• Nanotechnology
• Pharmaceutical Sciences

Background:

• Developing effective drug delivery systems for cancer chemotherapy is crucial.
• Targeted delivery can improve drug efficacy and reduce side effects.
• Pullulan offers potential for active targeting due to its interaction with hepatic cells.

Purpose of the Study:

• To synthesize and characterize pH-sensitive pullulan-doxorubicin (DOX) nanoparticles.
• To evaluate the drug release profile and targeting capability of these nanoparticles.
• To explore their potential as a liver-targeting drug delivery system for antitumor chemotherapy.

Main Methods:

• Synthesis of DOX-conjugated pullulan via hydrazone bonds, forming pH-sensitive conjugates.
• Characterization of core-shell nanoparticles (50-110 nm) with varying drug-loading content (up to 30 wt%).
• In vitro drug release studies at different pH values (5.0 and 7.4).
• Evaluation of active targeting to hepatic cells via asialoglycoprotein receptors.

Main Results:

• Conjugates formed uniform nanoparticles with pH-sensitive drug release, with >75% DOX released at pH 5.0 within 2h.
• Minimal DOX release (<15%) observed at neutral pH 7.4 over 12h.
• Pullulan facilitated active targeting to hepatic cells without additional ligands.

Conclusions:

• pH-sensitive pullulan-DOX nanoparticles demonstrate controlled drug release, ideal for acidic tumor microenvironments.
• The inherent targeting of pullulan enhances drug delivery to hepatic cells.
• These nanoparticles represent a promising platform for liver-targeted antitumor chemotherapy.