Thermo-responsive human α-elastin self-assembled nanoparticles for protein delivery

Area of Science:

• Biomaterials Science
• Nanotechnology
• Drug Delivery Systems

Background:

• Human α-elastin, a protein found in connective tissues, can be modified for biomaterial applications.
• Methoxypolyethyleneglycol (mPEG)ylation is a common technique to improve nanoparticle stability and control size.
• Thermo-responsive polymers exhibit changes in solubility with temperature, enabling controlled release applications.

Purpose of the Study:

• To develop self-assembled nanoparticles from PEGylated human α-elastin for sustained protein delivery.
• To characterize the thermo-responsive properties and encapsulation efficiency of these nanoparticles.
• To evaluate the release kinetics of encapsulated proteins.

Main Methods:

• Extraction and purification of human α-elastin.
• Modification of α-elastin with methoxypolyethyleneglycol (mPEG).
• Characterization of PEGylated α-elastin nanoparticles (PhENPs) using dynamic light scattering.
• Encapsulation of insulin and bovine serum albumin (BSA) into PhENPs.
• In vitro release studies of encapsulated proteins.

Main Results:

• PEGylated human α-elastin demonstrated a sol-to-particle transition with a lower critical solution temperature (LCST) between 25°C-40°C.
• PhENPs exhibited a narrow size distribution (average diameter 330±33nm).
• Significant encapsulation of insulin and BSA was achieved, with sustained release observed over 72 hours.

Conclusions:

• Thermo-responsive self-assembled PhENPs are a promising platform for sustained protein delivery.
• The developed nanoparticles offer potential applications in protein therapeutics and tissue engineering.
• The controlled release profile supports the utility of PhENPs for long-term therapeutic protein administration.