Customizable Hydrogel Coating of ECM-Based Microtissues for Improved Cell Retention and Tissue Integrity

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Oxygen diffusion limits hinder the development of large tissue-engineered constructs.
• Existing hydrogel microtissues face challenges with in vivo degradation and cell expulsion.

Purpose of the Study:

• To develop a customizable protocol for creating a protective hydrogel barrier around microtissues.
• To enhance the stability and cell retention of microtissues for regenerative therapies.

Main Methods:

• Calcium carbonate nanoparticles were embedded within ECM-based microtissues.
• Microtissues were exposed to alginate to form a hydrogel coating via diffusion.
• The thickness of the hydrogel coating was controlled by adjusting various parameters.

Main Results:

• A biocompatible hydrogel barrier was successfully generated around microtissues.
• The hydrogel coating prevented cell escape from the microtissues.
• In vitro and in vivo tests confirmed the protective function against degradation.

Conclusions:

• This novel technique provides a customizable hydrogel coating for microtissues.
• The technology addresses key limitations in microtissue stability and cell retention.
• It offers potential for advanced regenerative therapies using engineered microtissues.