3D cell culture based on artificial cells and hydrogel under microgravity for bottom-up microtissue constructs

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Cell Biology

Background:

• Developing effective methods for in vitro tissue construction is crucial for research.
• Bottom-up approaches offer advantages in controlling cell distribution and organization.
• Hydrogels are promising biomaterials for cell encapsulation and tissue scaffolding.

Purpose of the Study:

• To investigate the use of silk fibroin hydrogel as a filling medium for creating embedded gel-cell microcapsule complexes.
• To evaluate the tissue-forming ability of rat hepatocytes encapsulated within silk fibroin hydrogel under different culture conditions.
• To explore the potential of a bottom-up construction system for cell culture and tissue engineering applications.

Main Methods:

• Rat normal liver cells (BRL-3A) were microencapsulated using sodium alginate and chitosan.
• Silk fibroin solution extracted from silkworm pupae was sonicated to form silk fibroin gel.
• A silk fibroin hydrogel-microencapsulated hepatocyte embedded complex was prepared and cultured under static, shaking, and 3D microgravity conditions.

Main Results:

• Silk fibroin hydrogel successfully formed an embedded gel-cell microcapsule complex, providing structural support.
• Microgravity culture conditions significantly enhanced rat hepatocyte proliferation within the microcapsules.
• Microgravity culture promoted the formation of cell colonies, indicating improved tissue development.

Conclusions:

• Silk fibroin hydrogel serves as a suitable biomaterial for creating cell-laden microcapsule composites.
• 3D microgravity culture enhances the viability, proliferation, and tissue-forming capacity of encapsulated hepatocytes.
• This bottom-up construction system holds promise for advanced cell culture and in vitro tissue engineering.