Developmental Pathways Pervade Stem Cell Responses to Evolving Extracellular Matrices of 3D Bioprinted...

Area of Science:

• Biomedical Engineering
• Stem Cell Biology
• Tissue Engineering

Background:

• Extracellular matrix (ECM) production and engagement often precede stem cell differentiation.
• The sequential signaling events by which ECM triggers differentiation remain unclear.
• Understanding ECM's role is vital for developing effective stem cell therapies.

Purpose of the Study:

• To investigate the specificity of ECM engagement in directing stem cell differentiation pathways.
• To determine if long-term ECM remodeling dictates this specificity.
• To compare 3D versus 2D culture systems in supporting differentiation.

Main Methods:

• Utilized 3D bioprinted prisms composed of ECM proteins and controls for culturing human mesenchymal stem cells (hMSCs).
• Employed transcriptome profiling and advanced imaging techniques.
• Analyzed ECM composition and its impact on cellular behavior over time.

Main Results:

• Exogenous ECM in 3D microenvironments at early stages influences later microenvironment composition.
• Each evolving 3D microenvironment demonstrated unique potential to promote stem cell differentiation.
• 2D cultures showed minimal ECM remodeling and were less effective in stimulating developmental pathways.

Conclusions:

• Dynamic ECM remodeling in 3D microenvironments is essential for sequential signaling in stem cell differentiation.
• 3D culture systems better recapitulate developmental processes compared to 2D cultures.
• ECM's temporal evolution in 3D is a key determinant of differentiation outcomes.