Multiparametric Material Functionality of Microtissue-Based In Vitro Models as Alternatives to Animal Testing

Area of Science:

• Biomaterials Science
• Tissue Engineering
• In Vitro Toxicology

Background:

• The 3R principle (Replacement, Reduction, Refinement) established in 1959 necessitates alternatives to animal testing.
• Microtissue-based in vitro models offer a simplified yet complex representation of natural tissues.
• Ethical, scientific, economic, and legal factors drive the search for animal testing substitutes.

Purpose of the Study:

• To review the development of multifunctional, hydrogel-based materials for advanced in vitro model systems.
• To assess hydrogel properties critical for enhancing the functionality of microtissue models.
• To evaluate the potential of these materials as viable alternatives to animal testing.

Main Methods:

• Review of current literature on hydrogel-based microtissue systems.
• Analysis of material properties including processability, adaptivity, biocompatibility, and stability/degradability.
• Assessment of hydrogel suitability for in vitro model development.

Main Results:

• Hydrogels offer tunable properties essential for creating functional microtissue models.
• Key material characteristics such as processability, adaptivity, biocompatibility, and controlled stability/degradability are vital.
• Multifunctional hydrogels show promise in advancing in vitro systems.

Conclusions:

• Continuous improvement of microtissue model fundamentals is necessary for replacing animal testing.
• Hydrogel-based materials are critical components for developing next-generation in vitro models.
• Optimizing hydrogel properties will enhance the utility and acceptance of these models as animal testing alternatives.