Sequenced Somatic Cell Reprogramming and Differentiation Inside Nested Hydrogel Droplets.

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Cell Biology

Background:

• Current methods for generating pluripotent and therapeutic cells require extensive external manipulation, limiting clinical applications.
• Automated cell genesis using microscale physical forces and chronological biochemistry offers a promising avenue for enhanced clinical success.

Purpose of the Study:

• To design and fabricate nested polysaccharide droplets for automated cell transformation.
• To enable swift and efficient cell state evolution (somatic, pluripotent, therapeutic) without laborious external manipulation.

Main Methods:

• Fabrication of millimeter-sized nested polysaccharide droplets with cell-sustaining properties.
• Infusion of extracellular matrix proteins, reprogramming, and differentiation factors chronologically across droplet space.
• In vitro and in vivo testing of cell transformation into germ layer and bone cells.

Main Results:

• Demonstrated successful in vitro and in vivo transformation of cells into germ layer and bone cells.
• Nested droplets loaded with BMP-2 synthesized mineralized bone tissue plates in cranial non-union defects within 4 weeks.
• Showcased sequenced somatic cell reprogramming and differentiation within hydrogel modules without external manipulation.

Conclusions:

• Nested polysaccharide droplets provide a novel platform for controlled, automated cell reprogramming and differentiation.
• This approach significantly enhances the efficiency and clinical applicability of regenerative medicine strategies.
• The developed hydrogel modules create tissue-mimetic microenvironments that promote effective cell state transitions and tissue regeneration.