Biologically responsive micelles based on polygonatum sibiricum polysaccharide for docetaxel delivery

Area of Science:

• Biomaterials Science
• Drug Delivery Systems
• Nanotechnology

Background:

• Docetaxel (DTX) is a potent chemotherapy drug with limited efficacy due to poor solubility and systemic toxicity.
• Developing advanced drug delivery systems is crucial to enhance DTX's therapeutic index.
• Natural polysaccharides offer biocompatible platforms for drug encapsulation and targeted delivery.

Purpose of the Study:

• To synthesize and characterize pH- and redox-responsive copolymer micelles (PSP-ss-SA) for docetaxel (DTX) delivery.
• To evaluate the drug loading, release kinetics, and in vitro cytotoxicity of the developed micellar system.
• To assess the potential of PSP-ss-SA micelles in enhancing intracellular DTX accumulation in cancer cells.

Main Methods:

• Synthesis of PSP-ss-SA copolymer via conjugation of polygonatum sibiricum polysaccharide (PSP) and stearic acid (SA) to cystamine.
• Characterization of chemical structure using FTIR and 1H NMR spectroscopy.
• Micelle formation, critical micelle concentration (CMC) determination, particle size analysis, and drug encapsulation efficiency assessment.
• In vitro drug release studies under varying pH and redox conditions.
• In vitro cytotoxicity assays using 4T1 and HeLa cancer cell lines and hemolysis tests.

Main Results:

• PSP-ss-SA copolymer successfully self-assembled into micelles with a CMC of 0.0298 mg/mL.
• DTX-loaded micelles exhibited a particle size of 161.2 nm and confirmed drug encapsulation.
• Rapid DTX release was observed under acidic and reductive conditions, indicating stimuli-responsive behavior.
• PSP-ss-SA micelles showed low cytotoxicity and significantly enhanced intracellular DTX accumulation in cancer cells.

Conclusions:

• PSP-ss-SA copolymer micelles represent a promising stimuli-responsive drug delivery system for docetaxel.
• The developed system demonstrates potential for improved cancer therapy by enhancing drug delivery and efficacy.
• Further investigation into the in vivo performance of PSP-ss-SA micelles is warranted.