Structural maturation of myofilaments in engineered 3D cardiac microtissues characterized using small angle x-ray...

Area of Science:

• Biomaterials Science
• Stem Cell Biology
• Cardiovascular Research

Background:

• Engineering functional cardiac tissue from human-induced pluripotent stem-cell-derived cardiomyocytes (hiPSC-CMs) is crucial for drug screening, disease modeling, and therapeutic development.
• Understanding the structural maturation of hiPSC-CMs within engineered tissues is key to improving their function.

Purpose of the Study:

• To characterize the structural development of hiPSC-CMs in 3D engineered tissues during early maturation.
• To apply small angle X-ray scattering (SAXS) to assess myofilament organization in hiPSC-CMs.

Main Methods:

• Utilized small angle X-ray scattering (SAXS), a technique less common for biological materials, to analyze hiPSC-CMs in engineered tissues.
• Monitored myofilament lattice spacing over a 10-day maturation period.
• Visualized spacing changes across a grid within the engineered tissue.

Main Results:

• SAXS reliably characterized cardiomyocyte myofilament spacing.
• A monotonic decrease in myofilament lattice spacing was observed as the engineered tissue matured.
• Spatial mapping of spacing provided insights into tissue organization.

Conclusions:

• SAXS is effective for evaluating hiPSC-CM structural maturation in engineered tissues.
• Decreasing myofilament spacing correlates with tissue maturation over 10 days.
• This approach can aid in understanding cardiac pathophysiology and disease progression, potentially generating new hypotheses in stem cell engineering.