Dual-drug delivery system based on hydrogel/micelle composites

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Drug Delivery Systems

Background:

• Developing advanced drug delivery systems is crucial for targeted and controlled therapeutic agent release.
• Hydrogel and polypeptide micelle composites offer unique properties for encapsulating and releasing multiple drugs.
• Understanding drug release kinetics is essential for optimizing therapeutic efficacy and minimizing side effects.

Purpose of the Study:

• To design and characterize a dual-drug delivery system (DDDS) using hydrogel/polypeptide micelle composites.
• To investigate the independent release behaviors of aspirin (Asp) and doxorubicin (DOX) from the DDDS.
• To analyze the release mechanisms and environmental control of drug elution.

Main Methods:

• Fabrication of DDDS using poly(vinyl alcohol) (PVA) or Chitosan (CS)/PVA hydrogels and poly(L-glutamic acid)-b-poly(propylene oxide)-b-poly(L-glutamic acid) (GPG) micelles.
• Incorporation of aspirin (Asp) into hydrogels and doxorubicin (DOX) into GPG micelles.
• In vitro release studies under varying pH and temperature conditions.
• Analysis of drug release profiles using the Peppas power law equation.

Main Results:

• The DDDS exhibited independent release kinetics for Asp (short-term) and DOX (long-term, sustained).
• DOX release was environmentally controlled (pH, temperature) by the GPG micelle's sensitivity.
• Asp release was pH-controlled in the CS/PVA/micelle system due to CS hydrogel sensitivity.
• Release analysis indicated anomalous transport for Asp and a transition from Fickian to anomalous transport for DOX in different DDDS configurations.

Conclusions:

• The developed hydrogel/polypeptide micelle composite DDDS enables differential and controlled release of aspirin and doxorubicin.
• The system's responsiveness to environmental stimuli (pH, temperature) allows for tunable drug elution.
• The findings provide insights into the transport mechanisms governing drug release, paving the way for optimized dual-drug delivery strategies.