Beta-cyclodextrin-centered star-shaped amphiphilic polymers for doxorubicin delivery

Area of Science:

• Polymer Chemistry
• Nanomedicine
• Drug Delivery Systems

Background:

• Novel micellar systems are crucial for effective drug delivery.
• Beta-cyclodextrin-centered star-shaped amphiphilic polymers (sPEL/CD) offer potential for targeted drug delivery.
• Understanding the impact of polymer composition on micelle properties is essential for optimizing therapeutic efficacy.

Purpose of the Study:

• To investigate the effect of polylactide segments in sPEL/CD on micelle properties.
• To evaluate the critical micelle concentration, size, drug loading, and cytotoxicity of the developed micelles.
• To assess the drug resistance-reversing capability of the novel polymeric micelles.

Main Methods:

• Synthesis of sPEL/CD polymers using the arm-first method.
• Determination of critical micelle concentrations via fluorescence spectrophotometry with pyrene.
• Preparation and characterization of doxorubicin-loaded micelles using the oil/water method.
• Assessment of cytotoxicity, cellular uptake, and drug resistance reversal using cell-based assays (MTT, confocal microscopy, flow cytometry).

Main Results:

• Polymers exhibited low cytotoxicity with micelles showing pH-responsive release at pH 5.0.
• Incorporation of polylactide decreased critical micelle concentration and enhanced doxorubicin loading content.
• Significant reversal of drug resistance in MCF-7/ADR cells was observed due to polymer-P-glycoprotein interaction.

Conclusions:

• The developed polylactide-containing sPEL/CD micelles demonstrate promising characteristics for doxorubicin delivery.
• These micelles show potential for enhanced drug loading and effective reversal of multidrug resistance in cancer therapy.
• The novel polymer system holds potential superiority for future cancer treatment applications.