Biodegradable stereocomplex micelles based on dextran-block-polylactide as efficient drug deliveries

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Amphiphilic block copolymers are crucial for drug delivery systems.
• Biodegradable polymers offer advantages in reducing environmental impact and improving biocompatibility.
• Stereocomplexation between polymer chains can enhance material properties.

Purpose of the Study:

• To design and synthesize biodegradable stereocomplex micelles (SCMs) using dextran-block-polylactide (Dex-b-PLA) for efficient intracellular drug delivery.
• To investigate the self-assembly behavior and stability of SCMs driven by stereocomplexation.
• To evaluate the drug loading and release characteristics of SCMs using doxorubicin (DOX) as a model drug.

Main Methods:

• Synthesis of Dex-b-PLA copolymers via click reaction.
• Characterization of copolymer structure using (1)H NMR and FT-IR.
• Micelle formation and characterization using TEM, DLS, and fluorescence techniques.
• Thermal and crystal property analysis using DSC and XRD.
• In vitro drug release studies and cellular assays (CLSM, flow cytometry, MTT).

Main Results:

• Successfully synthesized Dex-b-PLA copolymers and formed stable SCMs through stereocomplexation.
• SCMs exhibited lower critical micelle concentrations (CMCs) due to stereocomplex interactions.
• DOX-loaded SCMs demonstrated slower in vitro drug release kinetics.
• DOX-loaded SCMs showed reduced cellular proliferation inhibition in HepG2 cells.

Conclusions:

• Biodegradable SCMs based on Dex-b-PLA are promising stable vehicles for intracellular drug delivery.
• The stereocomplexation strategy effectively enhances micelle stability and controls drug release.
• These SCMs hold significant potential for pharmaceutical and biomedical applications.