Protein release from highly charged peptide hydrogel networks.

Area of Science:

• Biomaterials Science
• Drug Delivery Systems
• Protein Engineering

Background:

• Hydrogels are effective carriers for therapeutic proteins, but controlling protein release rates is crucial for clinical applications.
• Electrostatic interactions are a key method for controlling protein release, but are often ineffective at physiological ionic strengths due to charge screening.

Purpose of the Study:

• To develop novel fibrillar hydrogels capable of electrostatic-based control over protein release under physiological buffer conditions.
• To investigate the use of highly charged self-assembling peptides for creating such hydrogels.

Main Methods:

• Preparation of fibrillar hydrogels using highly charged self-assembling peptides.
• Encapsulation of proteins with varying isoelectric points into charged hydrogel networks.
• Rheological analysis to assess gel properties.
• Bulk adsorption studies and transmission electron microscopy to investigate protein-fibril interactions.

Main Results:

• The developed peptide hydrogels exhibit sufficient electropotential for electrostatic control of protein release at physiological ionic strength.
• Proteins with different isoelectric points were successfully encapsulated into both negatively and positively charged hydrogel networks.
• Electrostatic interactions were confirmed to drive protein association with oppositely charged fibrils, influencing diffusion and retention.

Conclusions:

• Highly charged self-assembling peptide hydrogels offer a viable strategy for achieving electrostatic-based control over therapeutic protein release in physiological environments.
• These hydrogels can be tailored to encapsulate and control the release of diverse proteins, enhancing their potential as advanced drug delivery vehicles.