A fully degradable and photocrosslinked polysaccharide-polyphosphate hydrogel for tissue engineering

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Tissue Engineering

Background:

• Extracellular matrix (ECM) properties, particularly degradability, significantly influence cell behavior and are crucial for designing effective tissue engineering scaffolds.
• Developing advanced biomaterials that mimic natural ECM characteristics is essential for regenerative medicine applications.

Purpose of the Study:

• To develop a fully biodegradable hydrogel platform by combining synthetic polyphosphate and natural polysaccharide polymers.
• To investigate the hydrogel's properties, including its degradability, viscoelasticity, and ability to support cell growth and interaction.

Main Methods:

• Synthesis of a polyphosphate copolymer (PBYP-r-PEEP) with pendent alkynes via a one-pot reaction.
• Fabrication of photocrosslinked hydrogels using thiol-yne click chemistry between PBYP-r-PEEP and thiolated hyaluronic acid (HA-SH).
• Characterization of hydrogel properties and assessment of human mesenchymal stem cell (hMSC) behavior, including growth and RGD peptide conjugation.

Main Results:

• The synthesized PBYP-r-PEEP copolymer was successfully used to create fully degradable, photocrosslinked HA/PPE hydrogels.
• The HA/PPE hydrogels exhibited viscoelastic properties and enzymatic biodegradability.
• The hydrogels supported hMSC growth and allowed for covalent conjugation of RGD peptides, enhancing cell-cell interactions and promoting cell clustering.

Conclusions:

• The developed HA/PPE hydrogel system is a fully biodegradable and versatile platform for tissue engineering.
• This material supports hMSC viability, proliferation, and facilitates cell-cell interactions, making it suitable for regenerative medicine.
• The study expands the range of available fully degradable materials for advanced tissue engineering applications.