Poly(ethylene glycol) hydrogels with cell cleavable groups for autonomous cell delivery

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Cell Biology

Background:

• Cell-responsive hydrogels are promising for cell delivery in regenerative medicine.
• Current methods often require external stimuli for cell release.
• Developing autonomous cell delivery systems is crucial for therapeutic advancement.

Purpose of the Study:

• To engineer a novel poly(ethylene glycol) (PEG) hydrogel system for autonomous cell delivery.
• To investigate cell-controlled, protease-independent hydrogel degradation.
• To evaluate the efficacy of this system for in vitro and in vivo cell transplantation.

Main Methods:

• Synthesis of disulfide-modified PEG hydrogels.
• Incorporation of disulfide moieties into the hydrogel backbone.
• Assessment of hydrogel degradation in the presence of encapsulated cells.
• Evaluation of human mesenchymal stem cell differentiation post-release.
• In vivo studies using dorsal window chamber and intramuscular implantation models.

Main Results:

• Disulfide-modified PEG hydrogels degrade autonomously in response to cell-secreted molecules.
• Degradation rate is tunable based on cell type, cell density, and disulfide content.
• Released human mesenchymal stem cells retain their differentiation potential.
• In vivo studies show autonomous cell release and enhanced cell retention compared to controls.
• The hydrogel acts as a protective shield, facilitating cell delivery.

Conclusions:

• Developed a cell-responsive hydrogel enabling protease-independent, cell-controlled release.
• Demonstrated successful in vitro and in vivo delivery and retention of encapsulated cells.
• This biomaterial platform shows significant potential for improving cell transplantation therapies.