High-Throughput Bioprinting of Geometrically-Controlled Pre-Vascularized Injectable Microgels for Accelerated Tissue...

Area of Science:

• Regenerative Medicine
• Biomaterials Engineering
• Vascular Biology

Background:

• Tissue integration requires functional capillaries for nutrient/oxygen supply.
• Diffusion limitations in bulk hydrogels hinder regeneration of large defects.
• Pre-vascularization strategies are crucial for effective tissue engineering.

Purpose of the Study:

• To develop a high-throughput bioprinting method for creating pre-vascularized microgels.
• To assess the in vitro and in vivo performance of these microgels for tissue regeneration.
• To compare bioprinted microgels with monolithic hydrogels in challenging defect models.

Main Methods:

• High-throughput bioprinting of endothelial and stem cells within microgels.
• In vitro culture to promote pericyte-supported capillary formation.
• Minimally invasive in vivo injection of pre-vascularized constructs into defects.
• Comparison of regenerative capacity against cell-laden monolithic hydrogels.

Main Results:

• Bioprinted microgels formed mature, functional capillaries in vitro.
• In vivo studies showed faster connective tissue formation and increased vascularization.
• Widespread presence of functional chimeric vascular capillaries was observed.
• Demonstrated scalability and control over microgel microenvironments.

Conclusions:

• Bioprinting pre-vascularized microgels offers a scalable solution for tissue regeneration.
• This approach overcomes diffusion limitations and enhances vascularization in vivo.
• The strategy shows superior potential for translational regenerative medicine applications.