Shell-Sheddable Micelles Based on Poly(ethylene glycol)-hydrazone-poly[R,S]-3-hydroxybutyrate Copolymer Loaded with...

Area of Science:

• Biomaterials Science
• Nanotechnology
• Cancer Therapy

Background:

• Selective drug delivery to tumors is critical for reducing systemic toxicity in cancer treatment.
• The Warburg effect, a characteristic of tumors, offers a target for specialized drug delivery systems.
• Combining pH-responsive nanocarriers with glycoconjugation leverages tumor-specific characteristics for enhanced efficacy.

Purpose of the Study:

• To evaluate a novel nanocarrier system combining pH-sensitivity and glycoconjugation for targeted anticancer drug delivery.
• To synthesize and characterize biodegradable diblock copolymer micelles for drug encapsulation.
• To assess the in vitro efficacy and safety of the developed nanocarrier system.

Main Methods:

• Synthesis of poly(ethylene glycol)-hydrazone-poly[R,S]-3-hydroxybutyrate diblock copolymer.
• Self-assembly of copolymer into micelles (~55 nm) with pH-dependent drug release.
• In vitro studies using glycoconjugates and doxorubicin-loaded micelles on cancer cell lines (HCT-116, MCF-7) and normal cells (NHDF-Neo).
• Cytotoxicity, apoptosis, and cell cycle assays were performed at various time points.

Main Results:

• Micelles exhibited stability at pH 7.4 and decomposition with drug release at acidic pH.
• Blank micelles showed no toxicity to cells.
• Glycoconjugate-loaded micelles demonstrated enhanced selectivity, effectively inhibiting cancer cell proliferation.
• pH-dependent drug release was confirmed for the encapsulated anticancer agents.

Conclusions:

• The combination of pH-responsive nanocarriers and glycoconjugation offers a promising strategy for targeted cancer therapy.
• This multi-stimuli responsive nanocarrier system enhances drug selectivity and reduces off-target toxicity.
• The developed system provides an alternative approach for designing advanced nanomedicines for cancer treatment.