Engineering vasculature: Architectural effects on microcapillary-like structure self-assembly.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Vascularization remains a key challenge for bone tissue engineering scaffold translation.
• Existing research primarily focuses on nano- and micro-scale topography for cellular response.

Purpose of the Study:

• To investigate if scaffold architecture at the hundreds-of-microns scale can direct microvessel growth.
• To systematically explore the impact of patterned bioceramic architecture on microcapillary-like structure formation.

Main Methods:

• Fabrication of biphasic bioceramic patterned architectures using 3D printed molds.
• Varied groove and ridge dimensions (widths, periodicities, depths).
• Co-culture of human dermal microvascular endothelial cells (HDMECs) and human osteoblasts (hOBs).

Main Results:

• Bioceramic architecture significantly affected microcapillary-like structure location and orientation.
• Microcapillary structures predominantly formed within grooves.
• Grooves of 330 μm width and 300 μm depth yielded highly aligned microcapillary structures (~5 mm length).

Conclusions:

• Architecture at the hundreds-of-microns scale is a critical factor in modulating angiogenesis.
• Tuning scaffold design based on architecture-microvessel correspondence can engineer desired microvessel properties.
• This approach offers a novel strategy for achieving effective scaffold vascularization in bone tissue engineering.