Native and decellularized porcine vena cava: Biomechanical and microstructural comparison

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Biomedical Engineering

Background:

• Tissue decellularization yields acellular scaffolds that preserve native tissue morphology and reduce immunogenicity.
• Investigating mechanical behavior and protein composition is crucial for evaluating decellularized tissues.
• Decellularized scaffolds offer a natural microenvironment for cell seeding in tissue engineering.

Purpose of the Study:

• To evaluate the mechanical properties and microstructural characteristics of decellularized porcine vena cava.
• To compare decellularized scaffolds with native vena cava for potential vascular reconstruction applications.
• To analyze collagen fiber organization and orientation in native and decellularized venous tissue.

Main Methods:

• Extension-inflation tests were performed on native and decellularized porcine vena cava.
• Multiphoton microscopy was used to investigate the microstructure and collagen fiber organization.
• Mechanical data (pressure-stretch curves) and microstructural parameters (fiber orientation, diameter, tortuosity) were analyzed.

Main Results:

• Decellularized and native vena cava exhibited similar viscoelastic and nonlinear mechanical behaviors.
• No significant mechanical differences were observed between native and decellularized tissues at physiological inflation pressures.
• Multiphoton microscopy revealed comparable collagen fiber orientation (72° from circumferential) and distribution, though native media fibers were straighter than decellularized scaffolds.

Conclusions:

• Decellularized porcine vena cava scaffolds demonstrate largely comparable mechanical properties to native tissue, indicating their potential for vascular reconstruction.
• The microstructural analysis provides insights into venous physiology and forms a basis for in silico modeling.
• This study comprehensively characterizes decellularized veins, supporting their use in tissue engineering and regenerative medicine.