Accelerating protein release from microparticles for regenerative medicine applications

Area of Science:

• Biomaterials Science
• Drug Delivery Systems
• Tissue Engineering

Background:

• High doses of growth factors are currently used, necessitating better delivery systems.
• Controlling the spatio-temporal release of growth factors is crucial for enhancing efficacy and safety.
• Poly(lactic-co-glycolic) acid (PLGA) microparticles are a common platform for drug delivery.

Purpose of the Study:

• To develop a novel PLGA-based delivery system for controlled release of growth factors.
• To investigate the effect of PLGA-PEG-PLGA triblock copolymer incorporation on release kinetics.
• To achieve tunable release profiles for localized and sustained delivery of therapeutic agents.

Main Methods:

• Fabrication of PLGA microparticles incorporating varying ratios of PLGA-PEG-PLGA triblock copolymer.
• Characterization of microparticle formulations and their release kinetics over time.
• Evaluation of release profiles using different PLGA compositions (50:50 and 85:15) and copolymer concentrations (10% and 30%).

Main Results:

• Inclusion of PLGA-PEG-PLGA decoupled release kinetics from polymer degradation.
• A quasi zero-order release profile over four weeks was achieved with 10% PLGA-PEG-PLGA and 50:50 PLGA.
• Sustained release over ten days and four days was achieved with different formulations, demonstrating tunable release.
• Mixing microparticle formulations offered an additional method for controlling release kinetics.

Conclusions:

• The developed PLGA microparticle system with PLGA-PEG-PLGA copolymer provides customizable, localized, and controlled delivery of growth factors.
• This system demonstrates adjustable release profiles, improving the efficacy and safety of recombinant growth factor delivery.
• The formulations are promising for delivering growth factors like BMP-2, PDGF, and VEGF.