Hierarchically Micro- and Nanopatterned Topographical Cues for Modulation of Cellular Structure and Function

Area of Science:

• Biomaterials Science
• Cell Biology
• Tissue Engineering

Background:

• Cells dynamically respond to microenvironmental cues, including physical topography.
• Multiscale hierarchical substrates offer superior mimicry of the native extracellular matrix (ECM) compared to conventional nanopatterned surfaces.
• Hierarchical topographical cues are crucial for understanding physical factor roles in tissue function.

Purpose of the Study:

• To fabricate precisely controllable, multiscale hierarchical substrates mimicking complex ECM micro- and nanotopography.
• To investigate the effects of these substrates on various cell types, including fibroblasts, endothelial cells, osteoblasts, and human mesenchymal stem cells.
• To evaluate the substrates' potential for tissue engineering and regenerative medicine.

Main Methods:

• Fabrication of multiscale hierarchical substrates with both microscale wrinkles and nanoscale patterns.
• Cell culture experiments using fibroblasts, endothelial cells, osteoblasts, and human mesenchymal stem cells.
• Assessment of cell alignment, elongation, adhesion, and function on the fabricated substrates.

Main Results:

• The multiscale hierarchical substrates successfully mimicked complex ECM topography.
• All tested cell types exhibited enhanced alignment and elongation on these substrates.
• Nanotopography integrated with microscale wrinkles significantly promoted cell adhesion and function.

Conclusions:

• Hierarchical multiscale substrates effectively regulate cellular structure and function.
• These substrates provide a promising platform for advancing tissue engineering and regenerative medicine.
• The findings highlight the importance of hierarchical topographical cues in biomaterial design for biological applications.