Lysine-based polycation:heparin coacervate for controlled protein delivery

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Drug Delivery Systems

Background:

• Polycations show promise for delivering proteins and genetic material.
• Current limitations include poor control over release kinetics and safety concerns.

Purpose of the Study:

• To develop a novel, cytocompatible polycation for controlled protein delivery.
• To investigate the self-assembly and protein incorporation capabilities of the new polycation.

Main Methods:

• Synthesis of poly(ethylene lysinylaspartate diglyceride) (PELD), a lysine-based polycation.
• Formation of PELD:heparin coacervates for protein encapsulation.
• Modulation of coacervate surface charge by altering the PELD:heparin ratio.
• Evaluation of protein release profiles using bovine serum albumin (BSA).
• Assessment of coacervate adsorption onto polymeric scaffolds.

Main Results:

• PELD demonstrated high cytocompatibility.
• PELD self-assembled with heparin into coacervates with efficient protein loading.
• Varying the PELD:heparin ratio allowed tunable control over protein release rates and duration.
• Coacervates showed rapid adsorption onto scaffolds, indicating tissue engineering potential.

Conclusions:

• PELD-heparin coacervates offer a safe and tunable system for protein delivery.
• Surface charge modulation provides a direct method for controlling release kinetics.
• The system holds potential for diverse biomedical applications, including tissue engineering.