Tuning microenvironment for multicellular spheroid formation in thermo-responsive anionic microgel scaffolds

Area of Science:

• Biomaterials Science
• Cell Biology
• Drug Discovery

Background:

• Three-dimensional (3D) scaffold-based cell culture is a promising method for generating multicellular tumor spheroids.
• These scaffolds mimic the in vivo cellular microenvironment, enhancing intercellular and extracellular interactions crucial for spheroid development.
• Scaffold properties like surface wettability, chemistry, and charge significantly influence cell behavior and spheroid formation.

Purpose of the Study:

• To investigate the impact of scaffold surface properties, specifically charge density and hydrophobicity, on tumor spheroid formation.
• To determine the optimal scaffold characteristics for promoting efficient and large spheroid development for drug screening applications.

Main Methods:

• Utilized co-polymerization with various carboxylic acids to modify scaffold surface properties.
• Systematically altered scaffold surface charge density and hydrophobicity.
• Cultured cells on modified scaffolds to produce multicellular spheroids.
• Analyzed spheroid formation progress and size distribution.

Main Results:

• Scaffold surface charge density and hydrophobicity significantly influenced tumor spheroid formation and size.
• A scaffold surface with moderate negative charge density and high hydrophilicity promoted enhanced cell proliferation.
• These optimized conditions resulted in quicker and larger tumor spheroid formation.

Conclusions:

• Surface properties of 3D scaffolds are critical determinants of tumor spheroid formation.
• Tailoring scaffold hydrophilicity and surface charge can optimize spheroid development for drug screening.
• Scaffolds with moderate negative charge and high hydrophilicity are effective for generating larger and faster tumor spheroids.